spring mvc hello

最新推荐文章于 2022-02-20 14:35:36 发布

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#spring #mvc #spring mvc #web.xml

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本文详细介绍了如何配置 Spring MVC 的 web.xml 和 spring-servlet-config.xml 文件，并提供了控制器代码及前端页面示例，帮助读者理解 Spring MVC 的工作流程。

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1.配置web.xml文件

<?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">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
  	<servlet-name>hello</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<load-on-startup>1</load-on-startup>
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:spring-servlet-config.xml</param-value>
  	</init-param>
  </servlet>
  <servlet-mapping>
  	<servlet-name>hello</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

2.配置spring-servlet-config.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:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

	<!-- 在spring中配置HandlerMapping、HandlerAdapter -->
	<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
	<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
	<!-- ViewResolver -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
		<property name="prefix" value="/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	<bean name="/hello" class="com.controller.HelloController"></bean>
</beans>

3.控制器代码;

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.Controller;

public class HelloController implements Controller {

	public ModelAndView handleRequest(HttpServletRequest arg0,
			HttpServletResponse arg1) throws Exception {
		//1.收集参数，验证参数；
		//2.绑定参数到命令对象；
		//3.将命令对象传入业务对象，进行业务处理；
		//4.选择下一个页面;
		ModelAndView mv=new ModelAndView();
		//添加模型和数据可以是任意的POJO对象;
		mv.addObject("message","hello world"); //这是数据，相当于model
		//设置逻辑视图名，视图解析器会根据名字，将之解析到具体的视图页面;//设置view
		mv.setViewName("hello");
		return mv;
	}

}

4.前端页面

<%@ 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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
    <!-- 这是创建的hello.jsp页面 ;message:相当于我们的设置属性-->
    ${message }
  </body>
</html>

使用注解的话，