使用Spring Cloud OAuth2和JWT保护微服务

采用Spring Security AOuth2 和 JWT 的方式，避免每次请求都需要远程调度 Uaa 服务。采用Spring Security OAuth2 和 JWT 的方式，Uaa 服务只验证一次，返回JWT。返回的 JWT 包含了用户的所有信息，包括权限信息。

1.什么是JWT？#

JSON Web Token（JWT）是一种开放的标准（RFC 7519），JWT定义了一种紧凑且自包含的标准，该标准旨在将各个主体的信息包装为 JSON 对象。主体信息是通过数字签名进行加密和验证的。常使用 HMAC 算法或 RSA（公钥/私钥的非对称性加密）算法对JWT进行签名，安全性很高。

JWT 特点：

紧凑型：数据体积小，可通过 POST 请求参数或 HTTP 请求头发送。
自包含：JWT包含了主体的所有信息，避免了每个请求都需要向Uaa服务验证身份，降低了服务器的负载。

2.JWT的结构#

JWT结构：

Header（头）
Payload（有效载荷）
Signature（签名）

因此，JWT的通常格式是：xxxxx.yyyyy.zzzzz

（1）Header

Header 通常是由两部分组成：令牌的类型（即JWT）和使用的算法类型，如 HMAC、SHA256和RSA。例如:

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{
    "typ": "JWT",
    "alg": "HS256"
}

将 Header 用 Base64 编码作为 JWT 的第一部分。

（2）Payload

这是 JWT 的第二部分，包含了用户的一些信息和Claim（声明、权利）。有3类型的 Claim：保留、公开和私人。

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{
    "sub": "123456789",
    "name": "John Doe",
    "admin": true
}

将 Payload 用 Base64 编码作为 JWT 的第一部分。

（3）Signature

要创建签名部分，需要将 Base64 编码后的 Header、Payload 和秘钥进行签名，一个典型的格式如下:

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HMACSHA256(
    base64UrlEncode(header) + '.' +
    base64UrlEncode(payload),
    secret
)

3.如何使用JWT#

认证流程图如下，客户端获取JWT后，以后每次请求都不需要再通过Uaa服务来判断该请求的用户以及该用户的权限。在微服务中，可以利用JWT实现单点登录。

4.案例工程架构#

三个工程：

eureka-server：注册服务中心，端口8761。这里不再演示搭建。
auth-service：负责授权，授权需要用户提供客户端的 clientId 和 password，以及授权用户的username和password。这些信息准备无误之后，auth-service 返回JWT，该 JWT 包含了用户的基本信息和权限点信息，并通过 RSA 加密。
user-service：作为资源服务，它的资源以及被保护起来了，需要相应的权限才能访问。user-service 服务得到用户请求的 JWT 后，先通过公钥解密JWT，得到该JWT对应的用户的信息和用户的权限信息，再判断该用户是否有权限访问该资源。

工程架构图:

5.构建auth-service工程#

1.新建Spring Boot工程，取名为 auth-service，其完整pom.xml文件为.

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
<span class="hljs-tag">&lt;<span class="hljs-name">parent</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-parent<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>1.5.3.RELEASE<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">relativePath</span>/&gt;</span> <span class="hljs-comment">&lt;!-- lookup parent from repository --&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">parent</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>com.example<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>auth-service<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>0.0.1-SNAPSHOT<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>auth-service<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>Demo project for Spring Boot<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">properties</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">java.version</span>&gt;</span>1.8<span class="hljs-tag">&lt;/<span class="hljs-name">java.version</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">spring-cloud.version</span>&gt;</span>Dalston.SR1<span class="hljs-tag">&lt;/<span class="hljs-name">spring-cloud.version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">properties</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">dependencies</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-starter-eureka<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-web<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.security<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-security-jwt<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.security.oauth<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-security-oauth2<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-data-jpa<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>mysql<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>mysql-connector-java<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>

    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-test<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>test<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependencies</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">dependencyManagement</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependencies</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-dependencies<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${spring-cloud.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">type</span>&gt;</span>pom<span class="hljs-tag">&lt;/<span class="hljs-name">type</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>import<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
        <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependencies</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependencyManagement</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">build</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">plugins</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-maven-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
        <span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
        <span class="hljs-comment">&lt;!--防止jks文件被mavne编译导致不可用--&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.apache.maven.plugins<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>maven-resources-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">configuration</span>&gt;</span>
                <span class="hljs-tag">&lt;<span class="hljs-name">nonFilteredFileExtensions</span>&gt;</span>
                    <span class="hljs-tag">&lt;<span class="hljs-name">nonFilteredFileExtension</span>&gt;</span>cert<span class="hljs-tag">&lt;/<span class="hljs-name">nonFilteredFileExtension</span>&gt;</span>
                    <span class="hljs-tag">&lt;<span class="hljs-name">nonFilteredFileExtension</span>&gt;</span>jks<span class="hljs-tag">&lt;/<span class="hljs-name">nonFilteredFileExtension</span>&gt;</span>
                <span class="hljs-tag">&lt;/<span class="hljs-name">nonFilteredFileExtensions</span>&gt;</span>
            <span class="hljs-tag">&lt;/<span class="hljs-name">configuration</span>&gt;</span>
        <span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">plugins</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">build</span>&gt;</span>

</project>

2.配置application.yml文件

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spring:
  application:
    name: auth-service
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/spring-cloud-auth?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8
    username: root
    password: 123456
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
server:
  port: 9999
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

3.配置Spring Security

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@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
<span class="hljs-meta">@Override</span>
<span class="hljs-meta">@Bean</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> AuthenticationManager <span class="hljs-title">authenticationManagerBean</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> Exception </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">super</span>.authenticationManagerBean();
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">configure</span><span class="hljs-params">(HttpSecurity http)</span> <span class="hljs-keyword">throws</span> Exception </span>{
    http
        .csrf().disable() <span class="hljs-comment">//关闭CSRF</span>
            .exceptionHandling()
            .authenticationEntryPoint((request, response, authException) -&gt; response.sendError(HttpServletResponse.SC_UNAUTHORIZED))
        .and()
            .authorizeRequests()
            .antMatchers(<span class="hljs-string">"/**"</span>).authenticated()
        .and()
            .httpBasic();
}

<span class="hljs-meta">@Autowired</span>
UserServiceDetail userServiceDetail;

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">configure</span><span class="hljs-params">(AuthenticationManagerBuilder auth)</span> <span class="hljs-keyword">throws</span> Exception </span>{
    auth.userDetailsService(userServiceDetail)
            .passwordEncoder(<span class="hljs-keyword">new</span> BCryptPasswordEncoder()); <span class="hljs-comment">//密码加密</span>
}

}

UserServiceDetail.java

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@Service
public class UserServiceDetail implements UserDetailsService {
    @Autowired
    private UserDao userRepository;
<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> UserDetails <span class="hljs-title">loadUserByUsername</span><span class="hljs-params">(String username)</span> <span class="hljs-keyword">throws</span> UsernameNotFoundException </span>{
    <span class="hljs-keyword">return</span> userRepository.findByUsername(username);
}

}

UserDao.java

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@Repository
public interface UserDao extends JpaRepository<User, Long> {
<span class="hljs-function">User <span class="hljs-title">findByUsername</span><span class="hljs-params">(String username)</span></span>;

}

User对象和上一篇文章的内容一样，需要实现UserDetails接口，Role对象需要实现GrantedAuthority接口.

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@Entity
public class User implements UserDetails, Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
<span class="hljs-meta">@Column</span>(nullable = <span class="hljs-keyword">false</span>,  unique = <span class="hljs-keyword">true</span>)
<span class="hljs-keyword">private</span> String username;

<span class="hljs-meta">@Column</span>
<span class="hljs-keyword">private</span> String password;

<span class="hljs-meta">@ManyToMany</span>(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
<span class="hljs-meta">@JoinTable</span>(name = <span class="hljs-string">"user_role"</span>, joinColumns = <span class="hljs-meta">@JoinColumn</span>(name = <span class="hljs-string">"user_id"</span>, referencedColumnName = <span class="hljs-string">"id"</span>),
        inverseJoinColumns = <span class="hljs-meta">@JoinColumn</span>(name = <span class="hljs-string">"role_id"</span>, referencedColumnName = <span class="hljs-string">"id"</span>))
<span class="hljs-keyword">private</span> List&lt;Role&gt; authorities;


<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">User</span><span class="hljs-params">()</span> </span>{
}

<span class="hljs-function"><span class="hljs-keyword">public</span> Long <span class="hljs-title">getId</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> id;
}
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setId</span><span class="hljs-params">(Long id)</span> </span>{
    <span class="hljs-keyword">this</span>.id = id;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-keyword">public</span> Collection&lt;? extends GrantedAuthority&gt; getAuthorities() {
    <span class="hljs-keyword">return</span> authorities;
}

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setAuthorities</span><span class="hljs-params">(List&lt;Role&gt; authorities)</span> </span>{
    <span class="hljs-keyword">this</span>.authorities = authorities;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getUsername</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> username;
}

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setUsername</span><span class="hljs-params">(String username)</span> </span>{
    <span class="hljs-keyword">this</span>.username = username;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getPassword</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> password;
}

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setPassword</span><span class="hljs-params">(String password)</span> </span>{
    <span class="hljs-keyword">this</span>.password = password;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isAccountNonExpired</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isAccountNonLocked</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isCredentialsNonExpired</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">isEnabled</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>;
}

}

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@Entity
public class Role implements GrantedAuthority {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public String getAuthority() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return name;
    }
}

4.配置 Authorization Server

在 OAuth2Config 这个类中配置 AuthorizationServer，其代码如下:

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@Configuration
@EnableAuthorizationServer
public class OAuth2Config extends AuthorizationServerConfigurerAdapter {
    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory() //将客户端的信息存储在内存中
                .withClient("user-service") //创建了一个Client为"user-service"的客户端
                .secret("123456")
                .scopes("service") //客户端的域
                .authorizedGrantTypes("refresh_token", "password") //配置类验证类型为 refresh_token和password
                .accessTokenValiditySeconds(12*300); //5min过期
    }
<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">configure</span><span class="hljs-params">(AuthorizationServerEndpointsConfigurer endpoints)</span> <span class="hljs-keyword">throws</span> Exception </span>{
    endpoints.tokenStore(tokenStore()).tokenEnhancer(jwtTokenEnhancer()).authenticationManager(authenticationManager);
}

<span class="hljs-meta">@Autowired</span>
<span class="hljs-meta">@Qualifier</span>(<span class="hljs-string">"authenticationManagerBean"</span>)
<span class="hljs-keyword">private</span> AuthenticationManager authenticationManager;

<span class="hljs-meta">@Bean</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> TokenStore <span class="hljs-title">tokenStore</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> JwtTokenStore(jwtTokenEnhancer());
}

<span class="hljs-meta">@Bean</span>
<span class="hljs-function"><span class="hljs-keyword">protected</span> JwtAccessTokenConverter <span class="hljs-title">jwtTokenEnhancer</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-comment">//注意此处需要相应的jks文件</span>
    KeyStoreKeyFactory keyStoreKeyFactory = <span class="hljs-keyword">new</span> KeyStoreKeyFactory(<span class="hljs-keyword">new</span> ClassPathResource(<span class="hljs-string">"fzp-jwt.jks"</span>), <span class="hljs-string">"fzp123"</span>.toCharArray());
    JwtAccessTokenConverter converter = <span class="hljs-keyword">new</span> JwtAccessTokenConverter();
    converter.setKeyPair(keyStoreKeyFactory.getKeyPair(<span class="hljs-string">"fzp-jwt"</span>));
    <span class="hljs-keyword">return</span> converter;
}

}

5.生成 jks 文件

配置 JwtTokenStore 时需要使用 jks 文件作为 Token 加密的秘钥。

jks 文件需要Java keytool工具，保证Java环境变量没问题，打开计算机终端，输入命令:

keytool -genkeypair -alias fzp-jwt -validity 3650 -keyalg RSA -dname "CN=jwt,OU=jtw,O=jwt,L=zurich,S=zurich,C=CH" -keypass fzp123 -keystore fzp-jwt.jks -storepass fzp123

解释，-alias 选项为别名，-keypass 和 -storepass 为密码选项，-validity 为配置jks文件过期时间（单位：天）。

获取的 jks 文件作为私钥，只允许 Uaa 服务持有，并用作加密 JWT。也就是把生成的 jks 文件放到 auth-service 工程的resource目录下。那么 user-service 这样的资源服务，是如何解密 JWT 的呢？这时就需要使用 jks 文件的公钥。获取 jks 文件的公钥命令如下：

keytool -list -rfc --keystore fzp-jwt.jks | openssl x509 -inform pem -pubkey

这个命令要求你的计算机上安装了openSSL（下载地址），然后手动把安装的openssl.exe所在目录配置到环境变量。

输入密码fzp123后，显示的信息很多，我们只提取 PUBLIC KEY，即如下所示：

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAlCFiWbZXIb5kwEaHjW+/
7J4b+KzXZffRl5RJ9rAMgfRXHqGG8RM2Dlf95JwTXzerY6igUq7FVgFjnPbexVt3
vKKyjdy2gBuOaXqaYJEZSfuKCNN/WbOF8e7ny4fLMFilbhpzoqkSHiR+nAHLkYct
OnOKMPK1SwmvkNMn3aTEJHhxGh1RlWbMAAQ+QLI2D7zCzQ7Uh3F+Kw0pd2gBYd8W
+DKTn1Tprugdykirr6u0p66yK5f1T9O+LEaJa8FjtLF66siBdGRaNYMExNi21lJk
i5dD3ViVBIVKi9ZaTsK9Sxa3dOX1aE5Zd5A9cPsBIZ12spYgemfj6DjOw6lk7jkG
9QIDAQAB
-----END PUBLIC KEY-----

新建一个 public.cert 文件，将上面的公钥信息复制到 public.cert 文件中并保存。并将文件放到 user-service 等资源服务的resources目录下。到目前为止，Uaa 服务已经搭建完毕。

需要注意的是，Maven 在项目编译时，可能会将 jks 文件编译，导致 jks 文件乱码，最后不可用。需要在工程的 pom 文件中添加以下内容:

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<!--防止jks文件被mavne编译导致不可用-->
<plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-resources-plugin</artifactId>
       <configuration>
             <nonFilteredFileExtensions>
                 <nonFilteredFileExtension>cert</nonFilteredFileExtension>
                 <nonFilteredFileExtension>jks</nonFilteredFileExtension>
              </nonFilteredFileExtensions>
        </configuration>
</plugin>

最后，别忘了在启动类注解@EnableEurekaClient开启服务注册.

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@SpringBootApplication
@EnableEurekaClient
public class AuthServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(AuthServiceApplication.class, args);
    }
}

6.构建user-service资源服务#

1.新建Spring Boot工程，取名为user-service，其完整pom.xml文件:

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
<span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>com.example<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>user-service<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>0.0.1-SNAPSHOT<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">name</span>&gt;</span>user-service<span class="hljs-tag">&lt;/<span class="hljs-name">name</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">description</span>&gt;</span>Demo project for Spring Boot<span class="hljs-tag">&lt;/<span class="hljs-name">description</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">properties</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">java.version</span>&gt;</span>1.8<span class="hljs-tag">&lt;/<span class="hljs-name">java.version</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">spring-cloud.version</span>&gt;</span>Dalston.SR1<span class="hljs-tag">&lt;/<span class="hljs-name">spring-cloud.version</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">properties</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">dependencies</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-starter-eureka<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-web<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.security.oauth<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-security-oauth2<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-data-jpa<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>mysql<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>mysql-connector-java<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-starter-hystrix<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-starter-feign<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>

    <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-starter-test<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>test<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependencies</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">dependencyManagement</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">dependencies</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">dependency</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.cloud<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-cloud-dependencies<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">version</span>&gt;</span>${spring-cloud.version}<span class="hljs-tag">&lt;/<span class="hljs-name">version</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">type</span>&gt;</span>pom<span class="hljs-tag">&lt;/<span class="hljs-name">type</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">scope</span>&gt;</span>import<span class="hljs-tag">&lt;/<span class="hljs-name">scope</span>&gt;</span>
        <span class="hljs-tag">&lt;/<span class="hljs-name">dependency</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">dependencies</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">dependencyManagement</span>&gt;</span>

<span class="hljs-tag">&lt;<span class="hljs-name">build</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">plugins</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">plugin</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">groupId</span>&gt;</span>org.springframework.boot<span class="hljs-tag">&lt;/<span class="hljs-name">groupId</span>&gt;</span>
            <span class="hljs-tag">&lt;<span class="hljs-name">artifactId</span>&gt;</span>spring-boot-maven-plugin<span class="hljs-tag">&lt;/<span class="hljs-name">artifactId</span>&gt;</span>
        <span class="hljs-tag">&lt;/<span class="hljs-name">plugin</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">plugins</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">build</span>&gt;</span>

</project>

2.配置文件application.yml

在工程的配置文件application.yml中，配置程序名为 user-service，端口号为 9090，另外，需要配置 feign.hystrix.enable 为true，即开启 Feign 的 Hystrix 功能。完整的配置代码如下:

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server:
  port: 9090
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
spring:
  application:
    name: user-service
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/spring-cloud-auth?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8
    username: root
    password: 123456
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
feign:
  hystrix:
    enabled: true

3.配置Resource Server

在配置Resource Server之前，需要注入 JwtTokenStore 类型的 Bean。

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@Configuration
public class JwtConfig {
    @Autowired 
    JwtAccessTokenConverter jwtAccessTokenConverter;
<span class="hljs-meta">@Bean</span>
<span class="hljs-meta">@Qualifier</span>(<span class="hljs-string">"tokenStore"</span>)
<span class="hljs-function"><span class="hljs-keyword">public</span> TokenStore <span class="hljs-title">tokenStore</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> JwtTokenStore(jwtAccessTokenConverter);
}

<span class="hljs-meta">@Bean</span>
<span class="hljs-function"><span class="hljs-keyword">protected</span> JwtAccessTokenConverter <span class="hljs-title">jwtTokenEnhancer</span><span class="hljs-params">()</span> </span>{
    <span class="hljs-comment">//用作 JWT 转换器</span>
    JwtAccessTokenConverter converter =  <span class="hljs-keyword">new</span> JwtAccessTokenConverter();
    Resource resource = <span class="hljs-keyword">new</span> ClassPathResource(<span class="hljs-string">"public.cert"</span>);
    String publicKey ;
    <span class="hljs-keyword">try</span> {
        publicKey = <span class="hljs-keyword">new</span> String(FileCopyUtils.copyToByteArray(resource.getInputStream()));
    } <span class="hljs-keyword">catch</span> (IOException e) {
        <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> RuntimeException(e);
    }
    converter.setVerifierKey(publicKey); <span class="hljs-comment">//设置公钥</span>
    <span class="hljs-keyword">return</span> converter;
}

}

然后配置 Resource Server

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@Configuration
@EnableResourceServer //开启Resource Server功能
public class ResourceServerConfig extends ResourceServerConfigurerAdapter{
    @Autowired
    TokenStore tokenStore;
<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">configure</span><span class="hljs-params">(HttpSecurity http)</span> <span class="hljs-keyword">throws</span> Exception </span>{
    http
            .csrf().disable()
            .authorizeRequests()
            .antMatchers(<span class="hljs-string">"/user/login"</span>,<span class="hljs-string">"/user/register"</span>).permitAll()
            .antMatchers(<span class="hljs-string">"/**"</span>).authenticated();

}

<span class="hljs-meta">@Override</span>
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">configure</span><span class="hljs-params">(ResourceServerSecurityConfigurer resources)</span> <span class="hljs-keyword">throws</span> Exception </span>{
    resources.tokenStore(tokenStore);
}

}

4.新建一个配置类 GlobalMethodSecurityConfig，在此类中通过 @EnableGlobalMethodSecurity(prePostEnabled = true)注解开启方法级别的安全验证。

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@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class GlobalMethodSecurityConfig {
}

5.编写用户注册接口

拷贝auth-service工程的User.java、Role.java 和 UserDao.java 到本工程。

在 Service 层的 UserService 写一个插入用户的方法，代码如下

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@Service
public class UserServiceDetail {
<span class="hljs-meta">@Autowired</span>
<span class="hljs-keyword">private</span> UserDao userRepository;

<span class="hljs-function"><span class="hljs-keyword">public</span> User <span class="hljs-title">insertUser</span><span class="hljs-params">(String username,String  password)</span></span>{
    User user=<span class="hljs-keyword">new</span> User();
    user.setUsername(username);
    user.setPassword(BPwdEncoderUtil.BCryptPassword(password));
    <span class="hljs-keyword">return</span> userRepository.save(user);
}

}

BPwdEncoderUtil工具类

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public class BPwdEncoderUtil {
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> BCryptPasswordEncoder encoder = <span class="hljs-keyword">new</span> BCryptPasswordEncoder();

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> String  <span class="hljs-title">BCryptPassword</span><span class="hljs-params">(String password)</span></span>{
    <span class="hljs-keyword">return</span> encoder.encode(password);
}

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">boolean</span> <span class="hljs-title">matches</span><span class="hljs-params">(CharSequence rawPassword, String encodedPassword)</span></span>{
    <span class="hljs-keyword">return</span> encoder.matches(rawPassword,encodedPassword);
}

}

在 Web 层，在 Controller 中写一个注册的 API 接口 “/user/register”,代码如下

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@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    UserServiceDetail userServiceDetail;
<span class="hljs-meta">@PostMapping</span>(<span class="hljs-string">"/register"</span>)
<span class="hljs-function"><span class="hljs-keyword">public</span> User <span class="hljs-title">postUser</span><span class="hljs-params">(@RequestParam(<span class="hljs-string">"username"</span>)</span> String username , @<span class="hljs-title">RequestParam</span><span class="hljs-params">(<span class="hljs-string">"password"</span>)</span> String password)</span>{
    <span class="hljs-comment">//参数判断，省略</span>
   <span class="hljs-keyword">return</span> userServiceDetail.insertUser(username,password);
}

}

6.编写用户登录接口

在Service层，在 UserServiceDetail 中添加一个 login（登录）方法，代码如下：

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@Service
public class UserServiceDetail {
<span class="hljs-meta">@Autowired</span>
<span class="hljs-keyword">private</span> AuthServiceClient client;

<span class="hljs-function"><span class="hljs-keyword">public</span> UserLoginDTO <span class="hljs-title">login</span><span class="hljs-params">(String username, String password)</span></span>{
    User user=userRepository.findByUsername(username);
    <span class="hljs-keyword">if</span> (<span class="hljs-keyword">null</span> == user) {
        <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> UserLoginException(<span class="hljs-string">"error username"</span>);
    }
    <span class="hljs-keyword">if</span>(!BPwdEncoderUtil.matches(password,user.getPassword())){
        <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> UserLoginException(<span class="hljs-string">"error password"</span>);
    }
    <span class="hljs-comment">// 获取token</span>
    JWT jwt=client.getToken(<span class="hljs-string">"Basic dXNlci1zZXJ2aWNlOjEyMzQ1Ng=="</span>,<span class="hljs-string">"password"</span>,username,password);
    <span class="hljs-comment">// 获得用户菜单</span>
    <span class="hljs-keyword">if</span>(jwt==<span class="hljs-keyword">null</span>){
        <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> UserLoginException(<span class="hljs-string">"error internal"</span>);
    }
    UserLoginDTO userLoginDTO=<span class="hljs-keyword">new</span> UserLoginDTO();
    userLoginDTO.setJwt(jwt);
    userLoginDTO.setUser(user);
    <span class="hljs-keyword">return</span> userLoginDTO;

}

}

AuthServiceClient 通过向 auth-service 服务远程调用“/oauth/token” API接口，获取 JWT。在 "/oauth/token" API 接口，获取JWT。在“/oauth/token”API接口中需要在请求头传入 Authorization 信息，并需要传请求参数认证类型 grant_type、用户名 username 和密码 password，代码如下：

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@FeignClient(value = "auth-service",fallback =AuthServiceHystrix.class )
public interface AuthServiceClient {
<span class="hljs-meta">@PostMapping</span>(value = <span class="hljs-string">"/oauth/token"</span>)
<span class="hljs-function">JWT <span class="hljs-title">getToken</span><span class="hljs-params">(@RequestHeader(value = <span class="hljs-string">"Authorization"</span>)</span> String authorization, @<span class="hljs-title">RequestParam</span><span class="hljs-params">(<span class="hljs-string">"grant_type"</span>)</span> String type,
             @<span class="hljs-title">RequestParam</span><span class="hljs-params">(<span class="hljs-string">"username"</span>)</span> String username, @<span class="hljs-title">RequestParam</span><span class="hljs-params">(<span class="hljs-string">"password"</span>)</span> String password)</span>;

}

其中，AuthServiceHystrix 为AuthServiceClient 的熔断器，代码如下：

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@Component
public class AuthServiceHystrix implements AuthServiceClient {
    @Override
    public JWT getToken(String authorization, String type, String username, String password) {
        return null;
    }
}

JWT 为一个 JavaBean，它包含了 access_token、token_type 和 refresh_token 等信息，代码如下：

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public class JWT {
    private String access_token;
    private String token_type;
    private String refresh_token;
    private int expires_in;
    private String scope;
    private String jti;
    //getter setter

UserLoginDTO 包含了一个 User 和一个 JWT 对象，用于返回数据的实体：

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public class UserLoginDTO {
    private JWT jwt;
    private User user;
    //setter getter
}

登录异常类 UserLoginException

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public class UserLoginException extends RuntimeException{
    public UserLoginException(String message) {
        super(message);
    }
}

统一异常处理

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@ControllerAdvice
@ResponseBody
public class ExceptionHandle {
    @ExceptionHandler(UserLoginException.class)
    public ResponseEntity<String> handleException(Exception e) {
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> ResponseEntity(e.getMessage(), HttpStatus.OK);
}

}

在web层的 UserController 类补充一个登录的API接口“/user/login”.

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@PostMapping("/login")
public UserLoginDTO login(@RequestParam("username") String username , @RequestParam("password") String password){
    //参数判断，省略
    return userServiceDetail.login(username,password);
}

为了测试权限，再补充一个"/foo"接口，该接口需要“ROLE_ADMIN”权限.

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@RequestMapping(value = "/foo", method = RequestMethod.GET)
@PreAuthorize("hasAuthority('ROLE_ADMIN')")
public String getFoo() {
    return "i'm foo, " + UUID.randomUUID().toString();
}

最后，在启动类注解开启Feign：

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@SpringBootApplication
@EnableFeignClients
@EnableEurekaClient
public class UserServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserServiceApplication.class, args);
    }
}

7.启动工程,开始测试#

经过千辛万苦，终于搭建了一个Demo工程，现在开始依次启动 eureka-server、auth-service 和 user-service工程。这里我们使用PostMan测试编写的接口。

1.注册用户

2.登录获取Token

3.访问/user/foo

复制 access_token到 Header头部，发起GET请求。

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"Authorization":"Bearer {access_token}"

因为没有权限，访问被拒绝，我们手动在数据库添加"ROLE_ADMIN"权限，并与该用户关联。重新登录并获取Token，重新请求“/user/foo”接口

总结#

在本案例中，用户通过登录接口来获取授权服务的Token 。用户获取Token 成功后，在以后每次访问资源服务的请求中都需要携带该Token 。资源服务通过公钥解密Token ，解密成功后可以获取用户信息和权限信息，从而判断该Token 所对应的用户是谁，具有什么权限。
这个架构的优点在于，一次获取Token ，多次使用，不再每次询问Uaa 服务该Token 所对应的用户信息和用户的权限信息。这个架构也有缺点，例如一旦用户的权限发生了改变，该Token 中存储的权限信息并没有改变，需要重新登录获取新的Token 。就算重新获取了Token,如果原来的Token 没有过期，仍然是可以使用的，所以需要根据具体的业务场景来设置Token的过期时间。一种改进方式是将登录成功后获取的Token 缓存在网关上，如果用户的权限更改，将网关上缓存的Token 删除。当请求经过网关，判断请求的Token 在缓存中是否存在，如果缓存中不存在该Token ，则提示用户重新登录。

参考：《深入理解Spring Cloud与微服务构建》方志朋

JWT返回null问题解决

@Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
                .withClient("client")
                .redirectUris("http://www.baidu.com")
                //此处的scopes是无用的，可以随意设置
                .scopes("all","read", "write")
                .secret(passwordEncoder.encode("secret"))//这块就是解决办法，原本secret换成passwordEncoder.encode("secret")
                .authorizedGrantTypes("password", "authorization_code", "refresh_token")
                //有效期时间
//                .accessTokenValiditySeconds(accessTokenValiditySeconds)
                //刷新事件
//                .refreshTokenValiditySeconds(refreshTokenValiditySeconds)
                .and()
                .withClient("webapp")
                .scopes("xx")
                .authorizedGrantTypes("implicit");
    }