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

 <!-- 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

 
  1. <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>  
  2. <%  
  3. String path = request.getContextPath();  
  4. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  
  5. %>  
  6.   
  7. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
  8. <html>  
  9.   <head>  
  10.     <base href="<%=basePath%>">  
  11.       
  12.     <title>My JSP 'index.jsp' starting page</title>  
  13.     <meta http-equiv="pragma" content="no-cache">  
  14.     <meta http-equiv="cache-control" content="no-cache">  
  15.     <meta http-equiv="expires" content="0">      
  16.     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">  
  17.     <meta http-equiv="description" content="This is my page">  
  18.     <!--  
  19.     <link rel="stylesheet" type="text/css" href="styles.css">  
  20.     -->  
  21.   </head>  
  22.     
  23.   <body>  
  24.     <form action="/springMVC4/user/addUser" method="post">  
  25.     <h1>SpringMVC注解</h1>   
  26.     <br>  
  27.     ${result }  
  28.     <input type="submit"  value="post请求">  
  29.     </form>  
  30.   </body>  
  31. </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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