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>

<servlet>
  <servlet-name>springMVC</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  
  <init-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath*:config/springAnnotation-servlet.xml</param-value>
  </init-param>
  
  <load-on-startup>1</load-on-startup>
</servlet>

<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

<context:component-scan base-package="com.tgb.web.controller.annotation">
   </context:component-scan>

   
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean>


<bean name="/test/helloworld" class="com.tgb.web.controller.HelloWorldController"/>

      <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>

     
<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">

</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>

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