spring mvc方法映射器附(案例)

gitee源码在springmvc01分支下链接：https://gitee.com/xuxianke/yxyz.git

参考原博主：https://blog.csdn.net/qq_35987774/article/details/79598596

springmvc-servlet.xml文件,不能使用<mvc:default-servlet-handler>,会引起请求不被适配器找到的问题

<!--?xml version="1.0" encoding="UTF-8"?-->
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" 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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
  
    <bean id="empController" class="com.xpc.controller.EmpController">
        <!--注入方法适配器-->
        <property name="methodNameResolver" ref="resolver"></property>
        <!--注入service-->
        <property name="empService" ref="empService">
    </property></bean>

    <bean id="empService" class="com.xpc.service.imp.EmpServiceImp">
        <!--注入dao-->
        <property name="empDao" ref="empDao">
    </property></bean>

    <bean id="empDao" class="com.xpc.dao.imp.EmpDaoImp">
        <!--注入jdbcTemplate-->
        <property name="jdbcTemplate" ref="jdbcTemplate">
    </property></bean>
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource">
    </property></bean>
    <!--数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver">
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/test?useUnicod=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai">
        <property name="username" value="root">
        <property name="password" value="123456">
    </property></property></property></property></bean>

    <bean id="resolver" class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
        <property name="mappings">
            <props>
                <prop key="/emp/login">login</prop>
                <prop key="/emp/reg">regEmp</prop>
                <prop key="/emp/findAll">findAll</prop>
                <prop key="/emp/upd">updEmp</prop>
                <prop key="/emp/del">delEmp</prop>
            </props>
        </property>
    </bean>

    <bean id="handlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="urlMap">
            <props>
                <prop key="/emp/**">empController</prop>
            </props>
        </property>
    </bean>

    <bean id="handlerAdapter" class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter">
</bean></beans>

controller层的类继承MultiActionController类，methodNameResolver（方法名字适配器）是这个类中的一个属性。

package com.xpc.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.xpc.service.EmpService;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;

/**
 * 功能描述：逻辑控制层
 *
 * @author xpc on 2021/11/6 7:54
 */
public class EmpController extends MultiActionController {
    // 注入service
    private EmpService empService;

    public void setEmpService(EmpService empService) {
        this.empService = empService;
    }

    public void login(HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("aa");
        Map query = empService.query(request);
        JSONObject object = new JSONObject();
        object.put("data", query);
        object.put("code", 0);
        setResponse(response).getWriter().write(JSON.toJSONString(object));
    }

    public void regEmp(HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("aa");
        int result = empService.regEmp(request);
        JSONObject object = new JSONObject();
        object.put("data", result + "");
        object.put("code", 0);
        setResponse(response).getWriter().write(JSON.toJSONString(object));
    }

    public void updEmp(HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("aa");
        int result = empService.updEmp(request);
        JSONObject object = new JSONObject();
        object.put("data", result + "");
        object.put("code", 0);
        setResponse(response).getWriter().write(JSON.toJSONString(object));
    }

    public void delEmp(HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("aa");
        int result = empService.delEmp(request);
        JSONObject object = new JSONObject();
        object.put("data", result + "");
        object.put("code", 0);
        setResponse(response).getWriter().write(JSON.toJSONString(object));
    }

    public void findAll(HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("aa");
        Object result = empService.queryAll(request);
        setResponse(response).getWriter().write(JSON.toJSONString(result));
    }

    public EmpController() {
        System.out.println("EmpController 构造");
    }

    /**
     * 功能描述：设置返回的编码格式
     *
     * @param response:
     * @return: javax.servlet.http.HttpServletResponse
     **/
    private HttpServletResponse setResponse(HttpServletResponse response) {
        response.setCharacterEncoding("utf-8");
        return response;
    }
}

web.xml文件配置

<!--?xml version="1.0" encoding="UTF-8"?-->
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0">
    
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--springmvc配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:config/springmvc-servlet.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>encoding</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>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>*.html</url-pattern>
        <url-pattern>*.js</url-pattern>
        <url-pattern>*.css</url-pattern>
        <url-pattern>*.eot</url-pattern>
        <url-pattern>*.svg</url-pattern>
        <url-pattern>*.ttf</url-pattern>
        <url-pattern>*.woff</url-pattern>
        <url-pattern>*.woff2</url-pattern>
        <url-pattern>*.png</url-pattern>
        <url-pattern>*.gif</url-pattern>
        <url-pattern>*.jpg</url-pattern>
    </servlet-mapping>


    <welcome-file-list>
        <welcome-file>/loginEmp.html</welcome-file>
    </welcome-file-list>

    <error-page>
        <error-code>404</error-code>
        <location>/404.html</location>
    </error-page>
</web-app>

测试：

成功！！