SpringMVC helloworld (xml版本)

時間 2020-02-25

標籤 springmvc helloworld xml 版本欄目 Spring 简体版

原文原文鏈接

MyEclipse創建一個J2EE Web項目，導入架包，包括apache的commons-logging.jarcss

編寫web.xmlhtml

</pre><pre code_snippet_id="1683672" snippet_file_name="blog_20160514_2_6619650" name="code" class="html"><?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
	
  <display-name></display-name>	
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
</web-app>

先定義Servlet名字和 class load-on-startup 是設置是否開啓Tomcat容器時加載。

servlet-mapping 是設置遇到什麼狀況把這個請求交給xxServelt處理
spring配置文件放在WEB-INF下，命名規則是 DispatcherServletName-servlet.xmljava

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    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.xsd">
        <!-- 配置HandlerMapper -->
        <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
        <!-- 配置Handler Adapter -->
        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
        <!-- 配置渲染器 -->
        <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <!-- 結果視圖的前綴 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 結果視圖的後綴 -->
        <property name="suffix" value=".jsp"/>
       <!-- 配置請求和處理器 -->
        </bean>
         <bean name="/hello.do" class="cn.han.controller.HelloController"></bean>
</beans>

HandlerPapper是解析Url的，Handler Adapter 是解析URL後分配給對應的 Controller(Action)處理的。
springmvc 的各類配置在官方文檔的 The Web都有具體的例子。

渲染器是處理ModelAndView這類信息的。web

結果視圖的前綴就是映射到的 View的前面一半的路徑，後綴就是後面一半的路徑了。spring

最後一項配置是 URL到 Controller的映射。apache

HelloControlller.javamvc

package cn.han.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class HelloController implements Controller {

	public ModelAndView handleRequest(HttpServletRequest req,
			HttpServletResponse resp) throws Exception {
		// TODO Auto-generated method stub
		ModelAndView mv=new ModelAndView();
		mv.addObject("msg", "hello spring mvc!");
		mv.setViewName("hello");///WEB-INF/jsp/hello.jsp
		return mv;
	}

}

ModelAndView返回給Dispatcher處理交給渲染器處理後最後返回回客戶端。app

hello.jsp

在/WEB-INF/jsp下面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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    This is my JSP page. <br>
    ${msg}
  </body>
</html>

${msg}將會被渲染器替換，由於ModelAndView裏面有設置。