SpringMVC注解启用

本文是我在学习网络视频SpringMVC的过程中写下的。感谢发布视频的各位前辈

下面讲解SpringMVC注解启用的几个关键步骤：

首先需要加载配置文件（如果使用本人的代码请自己定义路径）

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  <display-name>springMVC1</display-name>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>  <!-- springMVC 入口 dispatcher -->  <servlet>  <servlet-name>springMVC</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <!-- 加载配置文件路径 -->  <init-param>  <param-name>contextConfigLocation</param-name>  <param-value>classpath*:config/springAnnotation-servlet.xml</param-value>  </init-param>  <!-- 何时启动  大于0的值表示容器启动时初始化此servlet，正值越小优先级越高-->  <load-on-startup>1</load-on-startup>  </servlet>  <!-- 拦截 -->  <servlet-mapping>  <servlet-name>springMVC</servlet-name>  <url-pattern>/</url-pattern>  </servlet-mapping></web-app>

其次，配置文件，最主要的是开启注解和Spring启动时加载扫描包

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"   xmlns:context="http://www.springframework.org/schema/context"   xmlns:p="http://www.springframework.org/schema/p"   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-3.0.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-3.0.xsd"><!-- spring 启动时扫描包 -->   <context:component-scan base-package="com.tgb.web.controller.annotation">   </context:component-scan>      <!-- 开启注解 --><bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /><bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean><!-- 路径对应调用的Controller --><bean name="/test/helloworld" class="com.tgb.web.controller.HelloWorldController"/><!-- 视图解析 -->      <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">      <property name="prefix" value="/WEB-INF/jsp"></property>      <property name="suffix" value=".jsp"></property>      </bean>           <!-- 静态资源访问（不拦截此目录下的东西的访问） --><mvc:resources location="/img/"  mapping="/img/**" />     </beans>

再次，书写Controller的java代码

package com.tgb.web.controller.annotation;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;@Controllerpublic class UserController {@RequestMapping(value="/user/addUser",method=RequestMethod.POST)public ModelAndView addUser(){String result = "addUser";return new ModelAndView("/annotation","result",result);}@RequestMapping(value="/user/delUser",method=RequestMethod.GET)public ModelAndView delUser(){String result = "delUser";return new ModelAndView("/annotation","result",result);}@RequestMapping(value="/user/toUser",method=RequestMethod.GET)public ModelAndView toUser(){String result = "toUser";return new ModelAndView("/touser","result",result);}}

此处请注意，@Controller的使用。@RequestMapping(value="/user/addUser",method=RequestMethod.POST)中的value表示跳转路径，method表示通过哪种方式调用这个方法

最后是前台的jsp界面

annotation.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>    <h1>SpringMVC注解</h1>     <br>    ${result }  </body></html>

touser.jsp界面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  <form action="/springMVC4/user/addUser" method="post">    <h1>SpringMVC注解</h1>     <br>    ${result }    <input type="submit"  value="post请求">    </form>  </body></html>