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）

 

web.xm;

 

<?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>

 

<?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;
@Controller
public 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>

<%@ 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>