demo_3

##　　控制器层

需求分析：

访问路径：`/user/reg.do`
请求参数：`username=xx&password=xx&&phone=xx&email=xx`
请求类型：`POST`
响应内容：`JSON`

1 在`pom.xml`中添加对`Jackson`的依赖：
2 
3     <!-- jackson -->
4     <dependency>
5         <groupId>com.fasterxml.jackson.core</groupId>
6         <artifactId>jackson-databind</artifactId>
7         <version>2.9.6</version>
8     </dependency>

对于JSON的解释

创建专门用于响应给客户端的JSON数据的类`com.demo.pojo.ResponseResult`

 1 package com.demo.pojo;
 2 
 3 import java.io.Serializable;
 4 
 5 public class ResponseResult<T> implements Serializable {
 6 
 7     /**
 8      * 
 9      */
10     private static final long serialVersionUID = -8070114279101787255L;
11 
12     private static final int STATE_SUCCESS = 1;
13     private static final int STATE_ERROR = 0;
14 
15     private Integer state;// 成功（1）或失败（0）
16     private String message;// 当失败时封装错误信息
17     private T data;// 数据
18 
19     public ResponseResult() {
20         super();
21         // TODO Auto-generated constructor stub
22     }
23 
24     public ResponseResult(Integer state) {
25         super();
26         this.state = state;
27     }
28 
29     public ResponseResult(Integer state, String message) {
30         super();
31         this.state = state;
32         this.message = message;
33     }
34 
35     /**
36      * 状态成功
37      * 
38      * @param state 1
39      * @param data  数据
40      */
41     public ResponseResult(Integer state, T data) {
42         super();
43         this.state = STATE_SUCCESS;
44         this.data = data;
45     }
46 
47     /**
48      * 状态失败
49      * 
50      * @param throwable 返回异常
51      */
52     public ResponseResult(Throwable throwable) {
53         super();
54         this.state = STATE_ERROR;
55         this.message = throwable.getMessage();
56     }
57 
58     public Integer getState() {
59         return state;
60     }
61 
62     public void setState(Integer state) {
63         this.state = state;
64     }
65 
66     public String getMessage() {
67         return message;
68     }
69 
70     public void setMessage(String message) {
71         this.message = message;
72     }
73 
74     public T getData() {
75         return data;
76     }
77 
78     public void setData(T data) {
79         this.data = data;
80     }
81 
82     public static long getSerialversionuid() {
83         return serialVersionUID;
84     }
85 
86     public static int getStateSuccess() {
87         return STATE_SUCCESS;
88     }
89 
90     public static int getStateError() {
91         return STATE_ERROR;
92     }
93 
94     @Override
95     public String toString() {
96         return "ResponseResult [state=" + state + ", message=" + message + ", data=" + data + "]";
97     }
98 
99 }

##　　在IUserService业务层添加登陆接口

1 /**
2      * 用户登录
3      * @param username 用户名
4      * @param password 密码
5      * @return 成功登录的用户名
6      * @throws UsernameNotExistsException
7      * @throws PasswordNotMatchException
8      */
9     User login(String username,String password);

在UserServiceImpl类实现

 1 public User login(String username, String password) {
 2         // 根据用户名查询用户信息
 3         User user = findUserByUsername(username);
 4         // 判断是否查询到匹配的用户信息
 5         if (user == null) {
 6             // 没有则抛出异常，用户名不存在UsernameNotExistsException
 7             throw new UsernameNotExistsException("尝试登陆的用户名" + username + "不存在！");
 8         } else {
 9             // 获取该用户的盐(UUID)
10             String salt = user.getUuid();
11             // 基于盐，对用于输入的密码（方法的参数）进行加密
12             String md5Password = getEncrpytedPassword(password, salt);
13             // 判断加密后的密码，与获取的用户信息中的密码是否匹配
14             if (user.getPassword().equals(md5Password)) {
15                 // 返回查询到的User对象
16                 return user;
17             } else {
18                 // 不匹配则抛出异常，密码错误PasswordNotMatchException
19                 throw new PasswordNotMatchException("您输入的用户名或密码不正确");
20             }
21         }
22     }

创建控制器类`com.demo.controller.UserController`，使用`@Controller`注解，并添加`@RequestMapping("/user")`注解。

在这个类中添加`public ResponseResult<Void> handleReg()`方法以处理请求，该方法使用`@RequestMapping(value="/reg.do",method=RequestMethod.POST)`注解，并添加`@ResponseBody`注解。

 1 package com.demo.controller;
 2 
 3 import javax.servlet.http.HttpSession;
 4 
 5 import org.springframework.beans.factory.annotation.Autowired;
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.RequestMethod;
 9 import org.springframework.web.bind.annotation.ResponseBody;
10 
11 import com.demo.pojo.ResponseResult;
12 import com.demo.pojo.User;
13 import com.demo.service.IUserService;
14 import com.demo.service.ex.ServiceException;
15 import com.demo.service.ex.UsernameNotExistsException;
16 
17 @Controller
18 @RequestMapping("/user")
19 public class UserController {
20     @Autowired
21     private IUserService userService;
22 
23     // 访问注册页面
24     @RequestMapping("/reg.do")
25     public String showReg() {
26         return "reg";
27     }
28 
29     // 访问登录页面
30     @RequestMapping("login.do")
31     public String showLogin() {
32         return "login";
33     }
34 
35     /**
36      * 将java数据转换为JSON串类型
37      * 
38      * @param username
39      * @param password
40      * @param phone
41      * @param email
42      * @param session
43      * @return 执行的数据
44      */
45     //处理注册信息
46     @RequestMapping(value = "/handle_reg.do", method = RequestMethod.POST)
47     @ResponseBody
48     public ResponseResult<Void> handleReg(String username, String password, String phone, String email,
49             HttpSession session) {
50         ResponseResult<Void> rr;
51 
52         User user = new User();
53         user.setUsername(username);
54         user.setPassword(password);
55         user.setPhone(phone);
56         user.setEmail(email);
57 
58         try {
59             User u = userService.reg(user);
60             //绑定信息
61             session.setAttribute("uid", u.getUsername());
62             rr = new ResponseResult<Void>(ResponseResult.STATE_ERROR);
63         } catch (UsernameNotExistsException e) {
64             rr = new ResponseResult<Void>(e);
65         }
66         return rr;
67     }
68     /**
69      * 
70      * @param username
71      * @param password
72      * @param session
73      * @return
74      */
75     //处理登录信息
76     @RequestMapping(value = "/handle_login.do", method = RequestMethod.POST)
77     @ResponseBody
78     public ResponseResult<Void> handlerLogin(String username, String password, HttpSession session) {
79         ResponseResult<Void> rr;
80         try {
81             User user = userService.login(username, password);
82             //绑定信息
83             session.setAttribute("uid", user.getId());
84             session.setAttribute("username", user.getUsername());
85             rr = new ResponseResult<Void>(ResponseResult.STATE_SUCCESS);
86         } catch (ServiceException e) {
87             rr = new ResponseResult<Void>(e);
88         }
89         return rr;
90     }
91 }

编辑`/web/register.jsp`，测试完毕