SpringMVC注解启用

Dear 丶 2022-08-27 05:40 225阅读 0赞

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>
      
      <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>

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">
    
    	
       <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">
    	
      </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>