SpringMVC框架学习（1）——HelloWorld

1.创建一个名为spring26-001-hello的Maven项目，结构如下

2.引入所需jar包的依赖坐标pom.xml,代码如下

<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.yc</groupId>    <artifactId>spring26-001-hello</artifactId>    <packaging>war</packaging>    <version>0.0.1-SNAPSHOT</version>    <name>spring26-001-hello Maven Webapp</name>    <url>http://maven.apache.org</url>    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.12</version>            <scope>test</scope>        </dependency>        <!-- springmvc的依赖坐标 -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>4.3.2.RELEASE</version>            <scope>runtime</scope>        </dependency>    </dependencies>    <build>        <finalName>spring26-001-hello</finalName>    </build></project>

3.创建SpringMVC的配置文件spring-mvc.xml和web.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:p="http://www.springframework.org/schema/p"    xmlns:util="http://www.springframework.org/schema/util" xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/util         http://www.springframework.org/schema/util/spring-util.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd        http://www.springframework.org/schema/aop         http://www.springframework.org/schema/aop/spring-aop.xsd        http://www.springframework.org/schema/tx        http://www.springframework.org/schema/tx/spring-tx.xsd">    <!-- 扫描指定包中，要对象交给springmvc容器管理的类 -->    <context:component-scan base-package="com.yc.springmvc"/>    <!-- 配置springmvc视图处理器的bean -->    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"/></beans>

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <!-- 请求方式转换：把post请求处理转换为put或delete请求方式 -->  <filter>        <filter-name>hiddenHttpMethodFilter</filter-name>        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>  </filter>  <filter-mapping>        <filter-name>hiddenHttpMethodFilter</filter-name>        <url-pattern>/*</url-pattern>  </filter-mapping>  <!-- 配置请求由springmvc框架处理 -->  <servlet>        <servlet-name>dispatcherServlet</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath:spring-mvc.xml</param-value>        </init-param>  </servlet>  <servlet-mapping>        <servlet-name>dispatcherServlet</servlet-name>        <url-pattern>/</url-pattern><!-- 不拦截处理xxx.jsp -->  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

4.创建处理类HelloHandler.java,代码如下

package com.yc.springmvc.web.handler;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;@Controller@RequestMapping("/springmvc")  //请求处理的前缀，可以做过滤处理 /user/*public class HelloHandler {    @RequestMapping("/hello")  //具体的请求资源处理    public String hello(){        System.out.println("请求HelloHandler.hello()处理进来了...");        //return "redirect:success.jsp";        return "forward:/success.jsp";    }    /**     * RequestMapper的参数     * params     * headers     * method     * consumes     * produces     * 用来做限制请求条件，主要有"="和"!="     * @return     */    @RequestMapping(value="/hello02",params={"name!=yc"})  //具体的请求资源处理    public String hello02(){        System.out.println("请求HelloHandler.hello02()处理进来了...");        //return "redirect:success.jsp";        return "forward:/success.jsp";    }    /**     * method 可以用来做rest风格处理     * get ==>取到资源     * post ==>插入资源     * put ==>更新资源     * delete ==>删除资源     * @return     */    @RequestMapping(value="/hello03",method=RequestMethod.GET)  //具体的请求资源处理    public String hello03(){        System.out.println("请求HelloHandler.hello03()处理进来了...");        //return "redirect:success.jsp";        return "forward:/success.jsp";    }    @RequestMapping(value="/hello04",method=RequestMethod.POST)  //具体的请求资源处理    public String hello04(){        System.out.println("请求HelloHandler.hello04()处理进来了...");        //return "redirect:success.jsp";        return "forward:/success.jsp";    }    @RequestMapping(value="/hello05",method=RequestMethod.PUT)  //具体的请求资源处理    public String hello05(){        System.out.println("请求HelloHandler.hello05()处理进来了...");        //return "redirect:success.jsp";        return "forward:/success.jsp";    }    @RequestMapping(value="/hello06",method=RequestMethod.DELETE)  //具体的请求资源处理    public String hello06(){        System.out.println("请求HelloHandler.hello06()处理进来了...");        //return "redirect:success.jsp";        return "forward:/success.jsp";    }}

5.前台界面如下

<html><body>    <h2>Hello World!</h2>    <form action="springmvc/hello04" method="post">        <button>post请求</button>    </form>    <form action="springmvc/hello05" method="post">        <input type="hidden" value="PUT" name="_method">        <button>put请求</button>    </form>    <form action="springmvc/hello06" method="post">        <input type="hidden" value="DELETE" name="_method">        <button>delete请求</button>    </form></body></html>

跳转界面如下

<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><!doctype html><html><head><meta charset="UTF-8"><title>Insert title</title></head>        <h1>你好，我是springmvc框架，欢迎你使用我，我是不是很帅！！！</h1><body></body></html>

6.运行结果

点击按钮之前出现