SpringMVC 控制器类名处理映射

小灰灰 2022-05-18 10:56 194阅读 0赞

学习参考自[易百教程][Link 1]

`ControllerClassNameHandlerMapping`类是基于特定的控制器类名的处理程序映射类，通过它的配置，便可以将url中与控制器类名相同的所有增长匹配请求交给该控制器进行处理。例如，当定义一个HelloController控制器时（通过继承AbstractController，实现handleRequestInternal方法，而不是添加注解），该类方法中将映射到URL："/hello\*" ，如：

http://localhost:8080/项目名/hello

http://localhost:8080/项目名/hello.jsp

http://localhost:8080/项目名/hello123abc

但大写/Hello 会匹配失败。最终的响应映射路径将是/hello.jsp而不是最短匹配，如：helloabc.jsp将显示404,但方法体内容已被执行。实现例子如下：

1、项目目录

![70][]

2、controller

package com.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.AbstractController;
    
    
    public class HelloController extends AbstractController{
    	
    	protected ModelAndView handleRequestInternal(HttpServletRequest request,
    			HttpServletResponse response)throws Exception{
    		ModelAndView model=new ModelAndView("hello");
    		model.addObject("message","Hello World!");
    		return model;
    	}
    }

3、spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">  
           
         
          
          <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
          	<property name="prefix" value="/WEB-INF/jsp/"></property>
          	<property name="suffix" value=".jsp"></property>
          </bean>
          
          
          <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>
          
          <bean class="com.controller.HelloController"/>
          <bean class="com.controller.WelcomeController"/>
           
    </beans>

4、web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
      <display-name>springMVC_controllerNameMapping</display-name>
      
    	<servlet>
    		<servlet-name>spring</servlet-name>
    		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    		<load-on-startup>1</load-on-startup>
    	</servlet>
    	<servlet-mapping>
    		<servlet-name>spring</servlet-name>
    		<url-pattern>/</url-pattern>
    	</servlet-mapping>
    
    </web-app>

5、hello.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
    <%
    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 'hello.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>
        <h2>This is hello page. ${message}<br></h2>
      </body>
    </html>

结果

![70 1][]

![70 2][]

如果将hello.jsp改名为helloa.jsp,将出现404，但执行了HelloConroller中的打印输出

![70 3][]

![70 4][]

[Link 1]: https://www.yiibai.com/spring_mvc/springmvc_beannameurlhandlermapping.html
[70]: /images/20220518/90bd4bf57537439586b966404482a2fe.png
[70 1]: /images/20220518/d8e61d4b0883442092e84d9e3c8a0be0.png
[70 2]: /images/20220518/fadd2af9c0df4494b0febf1881d7b8b5.png
[70 3]: /images/20220518/7c936901019447678f5d51d9ee58f150.png
[70 4]: /images/20220518/d7df382e1ffe466f91e019ec90b4f578.png