SpringMVC注释启用

这篇文章是我学习的网络视频SpringMVC写的过程。

谢谢公布各位前辈的视频

以下评论SpringMVC几个关键步骤，注意事项启用：

首先需要加载配置文件（假设请使用自定义路径）

<?
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>
  		<!-- 载入配置文件路径 -->
  		<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。最基本的是开启注解和Spring启动时载入扫描包

<?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>
	
	<!-- 路径相应调用的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>
      
     <!-- 静态资源訪问（不拦截此文件夹下的东西的訪问） -->
	<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种方法

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>