springmvc入门案例
2014-04-21 10:19
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springmvc运行机制:
首先request到达dispatcherServlet(即是controller),dispatcherServlet就会找到HandlerMapping,并且通过HanderMapping来确认url交给那个具体的Controller,接着就会交给相应的Controller来处理request,Controller会访问Model,做出反应,返回视图(页面),交由ViewResolver来管理,由ViewResolver来确定具体哪一个页面,并返回给request;
入门案例一:(基于xml)
项目整体架构:
lib:
WelcomeController.java:
welcome.jsp:
hello-servlet.xml:
web.xml:
运行结果:
案例二:(基于annotation)
项目架构:
HelloController.java:
hello.jsp:
hello-servlet.xml:
web.xml:
运行结果:
首先request到达dispatcherServlet(即是controller),dispatcherServlet就会找到HandlerMapping,并且通过HanderMapping来确认url交给那个具体的Controller,接着就会交给相应的Controller来处理request,Controller会访问Model,做出反应,返回视图(页面),交由ViewResolver来管理,由ViewResolver来确定具体哪一个页面,并返回给request;
入门案例一:(基于xml)
项目整体架构:
lib:
WelcomeController.java:
package com.iw.controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.AbstractController; /** * 该类相当于struts2当中的action */ public class WelcomeController extends AbstractController { @Override protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception { System.out.println("WelcomeController"); return new ModelAndView("welcome"); } }
welcome.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 'welcome.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> welcome<br> </body> </html>
hello-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <bean name="/welcome.html" class="com.iw.controller.WelcomeController"></bean> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 后缀 --> <property name="suffix" value=".jsp" /> </bean> </beans>
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" 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_3_0.xsd"> <display-name></display-name> <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> <!--服务器启动时便启动该servlet--> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>hello</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
运行结果:
案例二:(基于annotation)
项目架构:
HelloController.java:
package com.iw.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class HelloController { //表示用哪个url来对应 //当输入http://localhost:8088/spring_mvc/hello时,便会调用该方法 @RequestMapping({"/hello","/"}) public String hello(){ return "hello"; } }
hello.jsp:
<%@ 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 '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> 这是hello.jsp </body> </html>
hello-servlet.xml:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 设定到哪个包下寻找使用annotation注解的实体类 --> <context:component-scan base-package="com.iw.controller"/> <!-- 开启mvc annotation支持 --> <mvc:annotation-driven/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 后缀 --> <property name="suffix" value=".jsp" /> </bean> </beans>
web.xml:
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" 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_3_0.xsd"> <display-name></display-name> <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> <!--服务器启动时便启动该servlet--> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>hello</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
运行结果:
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