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一个Spring MVC简单的登录小实例(不带数据库)

2013-12-02 17:18 375 查看
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1、Spring mvc相关的jar包。

Spring 3.2.2的下载地址。。。从官网下载直接上传

这是我的目录:



 

2、建好项目,加载相关包。首先配置web.xml。DispatcherServlet 是Spring MVC 的入口。所有请求都会调用此接口。

需要在 web.xml 中注册 DispatcherServlet

<?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"> 
<!-- 添加spring控制器和映射 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 拦截所有以action 结尾的请求 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>


 

3、在web.xml相同的路径下新建一个配置文件。名字为springmvc-servlet.xml。名字要与web.xml中的<servlet-name>springmvc</servlet-name>相同,再加上-servlet.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"
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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

<!-- 默认扫描的包路径 -->
<context:component-scan base-package="org.cfc.com.spring" />

<!-- 启用spring mvc 注解 -->
<context:annotation-config />

<!-- 定义跳转的文件的前后缀   -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>


问题:如将 <property name="prefix" value="/" /> 配置为 <property name="prefix" value="/WEB-INF/user/" /> 总是出现找不到。但路径是没有问题的。请指教??

总会出现“The requested resource (/springmvcdemo1/user/success.jsp) is not available.”这个问题

 

4、框架已经搭建好了。现在开始做一个简单的登录。前台建好三个页面。login.html、fail.jsp和success.jsp以下是其代码。

login.html  登录页面

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>login.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>

<body>
<form action="login.action" method="post">
<label>username:</label><input type="text" name="username" /><br>
<label>password:</label><input type="text" name="password" /><br>
<input type="submit" value="submit" />
</form>
</body>
</html>


success.jsp   登录成功页面,用EL获取用户名

<%@ 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 'MyJsp.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>
欢迎${username }登录
</body>
</html>

 

fail.jsp  登录失败页面

<%@ 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 'MyJsp.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>
<h1>ERROR</h1>
</body>
</html>

 

5、前台建好了,在后台建立控制器。

在org.cfc.com.spring下建立一个类。

package org.cfc.com.spring;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class ControllerDemo01 {

//@Controller注解标识一个控制器,@RequestMapping注解标记一个访问的路径(/index)
//return "index"标记返回视图(index)
@RequestMapping("/user/login")
public ModelAndView regist( String username,String password,HttpServletRequest request){

if("admin".equals(username) && "admin".equals(password)){
request.setAttribute("username", username);
return new ModelAndView("/user/success");
}
return new ModelAndView("/user/fail");
}
}

 

6、已经完成。启动tomcat。结果如下图。







附上spring mvc工作原理图。有助于理解。



 
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