您的位置：首页 > 编程语言 > Java开发

Spring Web MVC 入门实例

2008-06-26 10:50 405 查看

今天学习了Spring的MVC.根据 http://dev.yesky.com/238/2599738.shtml做了个例子.
Spring 的web MVC 框架中担任前端控制器叫色的是org.springframework.web.servlet.DispatcherServlet,DispatcherServlet负责将客户的请求分配给控制对象,所以使用Spring Web MVC的第一步,就是在web.xml中定义DispatcherServlet;

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
 http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> 
<servlet>

<servlet-name>ntx</servlet-name>

<servlet-class>

org.springframework.web.servlet.DispatcherServlet

</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/ntx.xml</param-value>

</init-param>

<load-on-startup>2</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>ntx</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

在web.xml中定义了一个DispatcherServlet的实例ntx,从设定中可以看到,所有连接至*.do结尾的请求都会由它来处理,"contextConfigLocation"初始化参数用来设定Bean定义文件的
位置与名称,如果不设置,则DispatcherServlet默认会使用Servlet的名称为前置,读取"Servlet 名称_servlet.xml"作为其Bean定义文件,在上面的设定中则读取nxt.xml中的定            义。
DispatcherServlet负责分配请求至控制对象(Controller),在Spring Eeb MVC框架中,控制对象要实现org.springframework.web.servlet.mvc.Controller接口,Controller接口有一个必须实现的handleRequest()方法,其定义如下:
package com.wisetop.controller;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;

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

import com.wisetop.service.LoginService;

public class LoginController implements Controller {

private LoginService loginService;

private String gotoUrl;

public ModelAndView handleRequest(HttpServletRequest request,

HttpServletResponse response) throws Exception {

String userName = request.getParameter("userName");

this.getUserInfo(request, userName);

return new ModelAndView(this.getGotoUrl());

}

private void getUserInfo(HttpServletRequest request, String |userName) {

String userInfo = this.getLoginService().getUserInfo (userName);

request.setAttribute("userInfo", userInfo);

}

public String getGotoUrl() {

return gotoUrl;

}

public void setGotoUrl(String gotoUrl) {

this.gotoUrl = gotoUrl;

}

public LoginService getLoginService() {

return loginService;

}

public void setLoginService(LoginService loginService) {

this.loginService = loginService;

}

}
其他两个相关的接口和类定义如下:
package com.wisetop.service;

public interface LoginService {

public String getUserInfo(String userName);

}

package com.wisetop.serviceimpl;

import com.wisetop.service.LoginService;

public class LoginServiceImpl implements LoginService {

public String getUserInfo(String userName) {

return "你的名字是" + userName;

}

}

Bean文件定义如下:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC

"-//SPRING//DTD BEAN//EN"

"http://www.springframework.org/dtd/spring-beans.dtd">

<beans default-autowire="no" default-lazy-init="false"

default-dependency-check="none">

<bean id="loginService"

class="com.wisetop.serviceimpl.LoginServiceImpl" />

<bean id="loginController"

class="com.wisetop.controller.LoginController">

<property name="loginService">

<ref bean="loginService" />

</property>

<property name="gotoUrl">

<value>/showResult.jsp</value>

</property>

</bean>

<bean id="SimpleUrlHandlerMapping" 	class="org.springframework.web.servlet.handler.SimpleUrlHandler|Mapping">

<property name="mappings">

<props>

<prop key="/userLogin.do">loginController</prop>

</props>

</property>

</bean>

</beans>

测试页面:index.jsp

<%@ page language="java" pageEncoding="UTF-8"%>

<html>

<head>

<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>

<div>

<form method="post" action="userLogin.do">

<input type="text" name="userName" size="30"/><br/>

<input type="submit" value="提交 "/>

<a href="userLogin.do?userName=1">fffff</a>

</form>

</div>

</body>

</html>
showResult.jsp

<%@ page language="java" pageEncoding="UTF-8"%>

<html>

<head>

<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>

<%

String a=(String)request.getAttribute("userInfo");

%>

<%=a%>

</body>

</html>

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航