Spring mvc代码实例

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目录

spring mvc + mybatis

1、maven引入相关依赖

pom.xml

<?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>

    <groupId>z.project.springmvc</groupId>
    <artifactId>spring mvc demo</artifactId>
    <version>1.0</version>
    <packaging>war</packaging>

    <name>spring mvc demo Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- spring -->
        <!-- 引入context，自动引入基本包：apo、beans、core、expression、jcl -->
        <!--<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>-->

        <!-- spring mvc -->
        <!-- 引入webmvc，自动引入spring基本包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>

        <!-- mybatis-spring需要用到jdbc，自动引入tx包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.2.RELEASE</version>
        </dependency>

        <!-- 数据库和连接池 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.4</version>
        </dependency>

        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.3</version>
        </dependency>

        <!-- servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <!-- jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>

        <!-- json -->
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>2.11.0</version>
        </dependency>

    </dependencies>
</project>

2、数据库 jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost/db?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

3、spring配置文件

3.1、spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd ">
    <!-- 扫描注解，只扫描controller包下的注解 -->
    <context:component-scan base-package="com.spring.mvc.controller"/>

    <!-- 视图解析器，在Controller中设置视图名的时候会自动加上前缀和后缀 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/static/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 重定义资源文件的位置，mapping为请求，location为文件路径 -->
    <mvc:resources mapping="/views/**" location="/WEB-INF/static/views/"/>
    <!-- 设置静态资源由Web服务器默认的Servlet处理，如果 Web应用服务器默认Servlet不是"default"，需要通过default-servlet-name指定 -->
    <!--<mvc:default-servlet-handler/>-->

    <!-- 开启SpringMVC注解(使用了mvc:resources必须加上，不然@Controller不会加载) -->
    <mvc:annotation-driven>
        <!-- 解决返回数据中文乱码 -->
        <!-- register-defaults="true"将我们配置文件创建的bean设置为默认的,spring mvc就不会再后台创建了 -->
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json;charset=UTF-8</value>
                        <value>text/plain;charset=UTF-8</value>
                        <value>application/text;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <!-- 拦截器配置 -->
    <mvc:interceptors>
        <!--直接定义在 mvc:interceptors 下面的 Interceptor 将拦截所有的请求-->
        <!--<bean class="com.spring.mvc.interceptor.TestInterceptor"/>-->
        <mvc:interceptor>
            <!--/**标识拦截所有请求-->
            <mvc:mapping path="/interceptor/**"/>
            <bean class="com.spring.mvc.interceptor.TestInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>
</beans>
3.2、spring-dao.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 加载jdbc配置文件 -->
    <context:property-placeholder location="classpath*:jdbc.properties"/>

    <!-- 配置c3p0数据库连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池参数 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置MyBatis全局配置文件 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!-- 扫描sql配置文件:mapper需要的xml文件 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!-- 配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.project.dao"/>
    </bean>
</beans>
3.3、spring-service.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 扫描service包下所有使用注解的类型 -->
    <context:component-scan base-package="com.project.service"/>

    <!-- 定义事务 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 配置 Annotation 驱动，扫描@Transactional注解的类定义事务 -->
    <tx:annotation-driven transaction-manager="transactionManager" />
</beans>

4、mybatis配置文件

4.1、mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--配置全局属性-->
    <settings>
        <!-- 使用jdbc的getGeneratedKeys获取数据库自增主键值 -->
        <setting name="useGeneratedKeys" value="true" />

        <!-- 使用列别名替换列名 默认:true -->
        <setting name="useColumnLabel" value="true" />

        <!-- 开启驼峰命名转换:Table{create_time} -> Entity{createTime} -->
        <setting name="mapUnderscoreToCamelCase" value="true" />

        <!-- 调试输出sql -->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
</configuration>
4.2、table1mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.project.dao.Table1Dao">
    <select id="findAll" resultType="com.project.pojo.Table1">
        select * from table1 where 100 >= id
    </select>
</mapper>

5、web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>spring mvc demo</display-name>

    <!-- 指定spring配置文件位置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring-*.xml</param-value>
    </context-param>

    <!-- 字符集过滤器，解决post请求中文乱码 -->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- spring监听器，在启动Web容器时，自动装配spring配置文件里的配置信息 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- spring刷新Introspector防止内存泄露 -->
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>

    <!-- spring mvc前端控制器-->
    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 参数设置 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:spring-mvc.xml</param-value>
        </init-param>
        <!-- 加载优先级，当小于0时，表示该servlet被请求时才加载 -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <session-config>
        <!--单位为分钟-->
        <session-timeout>60</session-timeout>
    </session-config>

    <welcome-file-list>
        <!--<welcome-file>/WEB-INF/static/views/index.jsp</welcome-file>-->
        <welcome-file>""</welcome-file>
    </welcome-file-list>
</web-app>

6、Table1实体类和Table1Dao

实体类我就不写了
Table1Dao.java

package com.spring.mvc.dao;

import com.spring.mvc.pojo.Table1;

import java.util.List;

public interface Table1Dao {
    List<Table1> findAll();
}

采用mybatis的动态代理，与table1mapper.xml对应

7、Controller

TestController.java

package com.project.controller;

import com.project.dao.Table1Dao;
import com.project.pojo.Table1;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

//@RestController @controller + @ResponseBody
@Controller
public class TestController {
    @Resource
    Table1Dao table1Dao;

    @RequestMapping(value = "",method = RequestMethod.GET)
    public String init(){
        return "index";
    }

    @RequestMapping(value = "/mybatis")
    @ResponseBody
    public List<Table1> test(){
        //自动转json需要导入jackson依赖包
        List<Table1> list = table1Dao.findAll();
        return list;
    }

    @GetMapping("/t1")
    @ResponseBody
    public String test1(String name,int a){//此形式要求参数必需存在，不然报400
        System.out.println(name);
        System.out.println(a);
        return name + "," + a;
    }

    @GetMapping("/t2")
    @ResponseBody
    //设定defaultValue后可以不设required，此时也允许前端不传参
    public String test2(@RequestParam(value = "name",required = false,defaultValue = "默认文本") String a,@RequestParam(value = "age",defaultValue = "18") int b){
        System.out.println(a);
        System.out.println(b);
        return a + "," + b;
    }

    @GetMapping("/t/{param}")
    @ResponseBody
    public String test3(@PathVariable("param") String a){//映射 URL 绑定的占位符
        System.out.println(a);
        return a;
    }
}

8、spring mvc拦截器

package com.spring.mvc.interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (false)
            return false;
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

与spring-mvc.xml配置里的拦截器配置对应。
效果自行测试。

9、项目结构图

在这里插入图片描述

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原文地址：https://www.cnblogs.com/wccw/p/12997026.html