简述SpringMVC

超、凢脫俗 2022-08-09 14:56 183阅读 0赞

一、工作原理

首先浏览器向服务端的前端控制器（DispatcherServlet）发送一个http请求；

前端控制器查询一个或多个HandlerMapping；

前端控制器将处理请求传向查询到的HandlerMapping所对应的Controller；

Controller调用模型处理业务；

返回ModelAndView；

前端控制器查询一个或多个ViewResoler视图解析器，找到ModelAndView指定的视图

视图负责将结果显示到客户端。

![1353059506_5137.jpg][]

实例：

导入SpringMVC相关jar包

web.xml

<?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"  
    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">  
  
    <context-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>/WEB-INF/spring-servlet.xml</param-value>  
    </context-param>  
      
    <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>

spring-servlet.xml

<mvc:annotation-driven/>  
<context:component-scan base-package="com.demo.controller"/>

控制器TranslationController.java

package com.demo.controller;  
import org.springframework.stereotype.Controller;  
import org.springframework.ui.ModelMap;  
import org.springframework.web.bind.annotation.RequestMapping;  
import org.springframework.web.bind.annotation.RequestMethod;  
@Controller  
@RequestMapping(value="/trans",method=RequestMethod.GET)  
public class TranslationController \{  
    @RequestMapping(value="index",method=RequestMethod.GET)  
    public String test(ModelMap modelMap) throws Exception\{  
        modelMap.put("solr", "123");  
        return "/a";  
    \}  
\}

页面视图a.jsp

<?xml version="1.0" encoding="utf-8" ?>  
<%@ page language="java" contentType="text/html; charset=utf-8"  
    pageEncoding="utf-8"%>  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>Insert title here</title>  
</head>  
<body>  
success<span>$\{solr\}</span>  
</body>  
</html>

[1353059506_5137.jpg]: https://img-my.csdn.net/uploads/201211/16/1353059506_5137.jpg