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，
There is already handler of type [class com.sdemo.controller.Login] mapped.原因在于spring配置文件中和控制器注解都定义过了。
<bean name="/hello" class="com.controller.HelloController"></bean>
@Controller public class HelloController {
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