登录界面：
登录界面：
Spring 视图层_view
index.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 '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>
<form action="login.do" method="post">
用户名：<input type=text name="username"/><br>
密码：<input type=text name="password"/><br>
<input type=submit value="登录"/>
</form>
</body>
</html>
error.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 'error.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>
<form action="login.do" method="post">
用户名：<input type=text name="username"/><br>
密码：<input type=text name="password"/><br>
<input type=submit value="登录"/>
</form>
登录失败 , <%=request.getAttribute("msg") %>
</body></html>
success.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 'success.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>
恭喜：<%=request.getAttribute("username") %>,登录成功
</body>
</html>
Spring 控制层_control
LoginController.java
package com.spring.controller;
import java.util.HashMap;
import java.util.Map;
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.spring.model.UserInfoBean;
public class LoginController implements Controller {
private String successPage;
private String errorPage;
//private UserInfoBean userInfoBean;
public String getSuccessPage() {
return successPage;
}
public void setSuccessPage(String successPage) {
this.successPage = successPage;
}
public void setErrorPage(String errorPage) {
this.errorPage = errorPage;
}
private String getErrorPage() {
return errorPage;
}
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
String username=request.getParameter("username");
String password=request.getParameter("password");
String message=null;
if(username==null||password==null||username.trim().equals("")||password.trim().equals(""))
{
message=" 用户名或者密码为空";
Map<String,String> model=new HashMap<String,String>();
model.put("msg", message);
return new ModelAndView(getErrorPage(),model);
}
if(!UserInfoBean.exisitUser(username)){
message=username+"不存在";
Map<String,String> model=new HashMap<String,String>();
model.put("msg", message);
return new ModelAndView(getErrorPage(),model);
}
if(!UserInfoBean.confirmPassword(username,password)){
message=username+"密码不正确";
Map<String,String> model=new HashMap<String,String>();
model.put("msg", message);
return new ModelAndView(getErrorPage(),model);
}
else
{Map<String, String> model=new HashMap<String,String>();
model.put("username",username);
return new ModelAndView(getSuccessPage(),model);
}
}
}
Spring 模型层_model
UserInfoBean.java
package com.spring.model;
import java.util.HashMap;
import java.util.Map;
public class UserInfoBean {
private static Map<String,String>userinfo=new HashMap<String,String>();
static
{
String numberOneUser="zhangsan";
String numberOnePassword="123";
String numberTwoUser="lisi";
String numberTwoPassword="456";
userinfo.put(numberTwoUser, numberTwoPassword);
userinfo.put(numberOneUser, numberOnePassword);
}//判断一个用户名是否存在
public static boolean exisitUser(String username){
return userinfo.containsKey(username);
}
public static boolean confirmPassword(String username,String password)
{
return userinfo.get(username).equals(password);
}
}
Spring 配置文件：
Web.xml
<?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">
这里配置spring 的后台servlet
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
指定spring配置文件的路径
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/applicationContext.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
拦截所有以.do结尾的请求，可以修改
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<display-name></display-name>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
applicationContext.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-2.0.xsd">
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="login.do">login</prop>
</props>
</property>
</bean>
<bean id="login" class="com.spring.controller.LoginController">
<property name="errorPage">
<value>error.jsp</value>
</property>
<property name="successPage">
<value>success.jsp</value>
</property>
<!-- <property name="userInfoBean" ref="userInfoBean"></property>-->
</bean>
<!-- <bean id="UserInfoBean" class="com.spring.model.UserInfoBean"> </bean>-->
</beans>