SpringMVC学习（二）——基于xml配置的springMVC项目（maven+spring4）

可运行的附件地址：http://files.cnblogs.com/files/douJiangYouTiao888/springWithXML.zip

项目说明：

作者环境：maven3+jdk1.8+spring4

项目结构：

父pom：主要是进行一系列版本定义

<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">
    <!-- 基础组件模块，定义各种公用的组件 -->
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.wang</groupId>
    <artifactId>basicmodule</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>basicmodule</name>
    <url>http://maven.apache.org</url>
    <!-- 常量属性 -->
    <properties>
        <!-- 编码集 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <!-- spring版本 -->
        <springframework.version>4.3.7.RELEASE</springframework.version>
    </properties>
    <!-- 模块定义 -->
    <dependencyManagement>
        <dependencies>
            <!-- spring模块 -->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${springframework.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>${springframework.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${springframework.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${springframework.version}</version>
            </dependency>
            <!-- servlet-api -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
                <!-- <scope>provide</scope> -->
            </dependency>
            <!-- jstl，需要引入jstl.jar和standard.jar -->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
            <!-- <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
                <scope>provide</scope>
            </dependency> -->
        </dependencies>
    </dependencyManagement>

</project>

当前pom：

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.wang</groupId>
  <artifactId>springWithXML</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>springWithXML Maven Webapp</name>
  <url>http://maven.apache.org</url>
 <!-- 父模块，基础模块 -->
    <parent>
        <groupId>com.wang</groupId>
        <artifactId>basicmodule</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <dependencies>
    <!-- springMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>
        <!-- servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
    </dependencies>
    <build>
        <finalName>sprintWithXML</finalName>
    </build>
</project>

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <!--
        源码：spring-web.jar 
        功能：字符集过滤器，设置编码集为UTF-8，解决POST的中文乱码问题。
        参数说明：
            encoding：request的编码集(request.setCharacterEncoding("UTF-8"))
            forceEncoding：默认为false设置为true，response的编码集也强制转变成UTF-8(response.setCharacterEncoding("UTF-8"))
    -->
    <filter>
        <filter-name>encodingFilter</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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!-- 
        源码：spring-web.jar
        默认配置：/WEB-INF/${servlet-name}-servlet.xml，即/WEB-INF/wly-servlet.xml
        覆盖默认配置：初始化参数：contextConfigLocation，参数多个值使用逗号隔开，如：a.xml,b.xml
     -->
    <servlet>
        <servlet-name>wly</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:wly-servlet.xml</param-value>
        </init-param>
        <!-- 容器初始化加载此servlet -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>wly</servlet-name>
        <!-- 
            一般有以下写法：
            *.do    拦截固定格式的请求
            /       rest风格的写法：拦截所有资源，需要针对静态资源做单独处理
            /*      错误写法：会在处理完请求后拦截jsp导致404错误
         -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!-- 测试使用的servlet -->
    <servlet>
        <servlet-name>testServlet</servlet-name>
        <servlet-class>com.wang.servlet.TestServlet</servlet-class>
    </servlet>
</web-app>  

springmvc核心配置文件：wly-servlet.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-4.1.xsd  
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
    <!-- 公共配置，默认配置在org.springframework.web.servlet.Dispatcher类同包DispatcherServlet.properties下 -->
    <!-- HandlerMapping，映射器，配置的bean.name对应请求的url，将请求的url映射为一个HandlerExecutionChain对象（包含一个Handler和多个HandlerInterceptor) -->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <!-- HandlerAdapter，将handler包装为适配器，满足各种不同适配器的使用，Controller、SimpleFormController等 -->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
    <!-- ViewResovler，将拼接视图逻辑名称转为物理视图 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 需要引入jstl的相关jar包，jstl1.2以下需要引入jstl.jar、standard.jar -->
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 静态资源处理，不拦截静态资源 -->
    <mvc:resources location="/" mapping="/**/*.js"></mvc:resources>
    
    <!-- handler,处理器，需要开发实现 -->
    <bean name="/wang" class="com.wang.controller.WangController"/>
    <!-- 接口return null的情况代表已经把输出通过流的形式返回，无需进行视图的解析 -->
    <bean name="/testNull" class="com.wang.controller.NullController"/>
    <!-- GET、POST请求方式的限定，supportedMethods需要配合AbstractController使用 -->
    <bean name="/helloPost" class="com.wang.controller.HelloController">
        <property name="supportedMethods" value="POST"></property>
    </bean>
    <!-- 缓存响应信息 -->
    <bean name="/helloCache" class="com.wang.controller.HelloController">
        <!-- 默认为-1，>0的值代表缓存时间 -->
        <property name="cacheSeconds" value="8"></property>
    </bean>
    <!-- 请求转发给servlet来处理 -->
    <bean name="/helloServlet" class="org.springframework.web.servlet.mvc.ServletForwardingController">
        <!--value对应web.xml的<servlet-name>-->
        <property name="servletName" value="testServlet"></property>
    </bean>
</beans>

java类：

package com.wang.controller;

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

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;

public class HelloController extends AbstractController{
    @Override
    protected ModelAndView handleRequestInternal(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.err.println("deal request");
        ModelAndView mv =new ModelAndView();
        //模型
        mv.addObject("message","test");
        //视图
        mv.setViewName("index");
        return mv;
    }
}

package com.wang.controller;

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

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class NullController implements Controller{

    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        response.getWriter().write("<a href=''>this</a>");
        //return null给DispatcherServlet，即告知servlet无需进行视图解析。
        return null;
    }
}

package com.wang.controller;

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

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class WangController implements Controller {
    
    public ModelAndView handleRequest(HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        System.err.println("deal request!");
        ModelAndView mv =new ModelAndView();
        //模型
        mv.addObject("message","test");
        //视图
        mv.setViewName("index");
        return mv;
    }
}

package com.wang.servlet;

import java.io.IOException;

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

public class TestServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        doPost(req, resp);
    }
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.err.println("servlet处理");
        resp.sendRedirect("index.jsp");
    }
}

测试URL：

　　http://ip:port/具体URL

　　1.Controller返回ModeAndView：/wang

　　2.Controller返回null：/testNull

　　3.只接受POST请求：/helloPost

　　4.缓存响应信息：/helloCache

　　5.请求转发给servlet来处理：/helloServlet

　　例：http://localhost:8088/wang

OK，大功告成~