Struts2_拦截器_登录拦截

Struts2_拦截器_登录拦截

一、1.jar包

	asm-3.3.jar

	asm-commons-3.3.jar
	asm-tree-3.3.jar
	commons-chain-1.2.jar
	commons-fileupload-1.3.jar
	commons-io-2.0.1.jar
	commons-lang3-3.1.jar
	commons-logging-1.1.3.jar
	freemarker-2.3.19.jar
	javassist-3.11.0.GA.jar
	jcommon-1.0.23.jar
	jfreechart-1.0.19.jar
	log4j-1.2.17.jar
	mysql-connector-java-5.1.8-bin.jar
	ognl-3.0.6.jar
	struts2-core-2.3.15.3.jar
	struts2-jfreechart-plugin-2.3.4.1.jar
	struts2-json-plugin-2.3.4.1.jar
	xwork-core-2.3.15.3.jar

2.web.xml配置

<?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">

  <!-- 配置核心控制器  -->
  <filter>
  	<filter-name>strutsFilter</filter-name>
  	<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>strutsFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

3.interceptor编写

package cn.itcast.web.interceptor;

import java.util.Map;

import cn.itcast.domain.User;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class LoginInterceptor extends AbstractInterceptor{
@Override
public String intercept(ActionInvocation invocation) throws Exception {
	// TODO Auto-generated method stub
	
	Map<String, Object> map = ActionContext.getContext().getSession();
	User user = (User)map.get("LoginUser");//从session中获取user对象
	if(user==null){//判断该user对象是否存在
		return "login";//返回到全局
	}
	String result = invocation.invoke();//执行已经验证登录的功能
	return result;
	}

}

4.action编写 (1)UserLoginAction package cn.itcast.web.action; import java.util.Map; import com.opensymphony.xwork2.ActionContext; import cn.itcast.domain.User; import cn.itcast.service.UserService; import cn.itcast.service.Impl.UserServiceImpl; import cn.itcast.utils.BaseAction;

public class UserLoginAction extends BaseAction{
private User user = new User();//声明接收到的用户对象
private String msg;//声明向页面回显的信息
private UserService userService = new UserServiceImpl();
@Override
public String execute() throws Exception {
	Boolean result = userService.findUser(user);//查询该用户对象是否存在
	if(result){//如果用户存在
		Map<String, Object> map = ActionContext.getContext().getSession();
		map.put("LoginUser", user);//将用户信息存放到session中
		return SUCCESS;
	}
	msg = "用户名或者密码错误！";//否则,向页面提示错误信息
	return "fail";
}
public User getUser() {
	return user;
}
public void setUser(User user) {
	this.user = user;
}
public String getMsg() {
	return msg;
}
public void setMsg(String msg) {
	this.msg = msg;
}
}
(2)
package cn.itcast.web.action;
import java.util.List;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;
import cn.itcast.service.Impl.UserServiceImpl;
import cn.itcast.utils.BaseAction;

public class UserAction extends BaseAction{
private UserService userService = new UserServiceImpl();
private List<User> users;//声明向list页面传输的数据
@Override
public String execute() throws Exception {
	users = userService.queryUsers();//查询用户列表
	return SUCCESS;
}
public List<User> getUsers() {
	return users;
}
public void setUsers(List<User> users) {
	this.users = users;
}
}

5.service编写

package cn.itcast.service.Impl;
import java.util.List;
import cn.itcast.dao.UserDao;
import cn.itcast.dao.Impl.UserDaoImpl;
import cn.itcast.domain.User;
import cn.itcast.service.UserService;

public class UserServiceImpl implements UserService {
	private UserDao userDao = new UserDaoImpl();
	public Boolean findUser(User user) {
		// TODO Auto-generated method stub
		Boolean result = userDao.findUser(user);
		return result;
	}
	public List<User> queryUsers() {
		// TODO Auto-generated method stub
		List<User> list = userDao.queryUsers();
		return list;
	}
}

6.dao编写 工具类：JDBCUtils:特点：Object...params

package cn.itcast.dao.Impl;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import cn.itcast.dao.UserDao;
import cn.itcast.domain.User;
import cn.itcast.utils.JDBCUtil;
public class UserDaoImpl implements UserDao {
public Boolean findUser(User user) {
	String sql = "select * from user where username=? and password=?;";
	List<Map<String, Object>> Alist = JDBCUtil.query(sql, user.getUsername(),user.getPassword());
	if(Alist.size()==0){
		return false;
	}
	return true;
}
public List<User> queryUsers() {
	// TODO Auto-generated method stub
	String sql = "select * from user";
	List<Map<String, Object>> Alist = JDBCUtil.query(sql);
	if(Alist.size()==0){
		return null;
	}
	List<User> list = new ArrayList<User>();
	for (Map<String, Object> map : Alist) {
		User user = new User();
		user.setId((Integer)map.get("id"));
		user.setUsername((String)map.get("username"));
		user.setPassword((String)map.get("password"));
		list.add(user);
	}
	return list;
}
}

7.jsp页面 (1)登录页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
   <fieldset style="text-align: center;">
		 <form action="userLogin" method="post">
		   <span style="color:red;">${msg }</span>
		    <legend align="top">登录</legend>
			 	用户名:<input name="user.username"/><br/>
			 	密码：<input name="user.password" type="password"/>
			 	<br/>
			 	<input type="submit"  value="登录"/>
			 	<input type="reset"  value="重置"/>
		 </form>
 	</fieldset>
</body>
</html>
(2)列表页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%
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%>">
<style type="text/css">
	.s1{
		background-color: red;
	}
	
	.s2{
		background-color: green;
	}
</style>    
<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>
  	<h1>用户列表</h1>
  	<table cellpadding="20px" cellspacing="0px" bgcolor="yellow"  width="100%"  border="1px">
  		<tr>
  			<td>用户编号</td>
  			<td>用户名称</td>
  			<td>用户密码</td>
  		</tr>
  	<c:forEach items="${users }" var="u" varStatus="s">
  		<tr>
	  		 <td>${u.id }</td>
	  		 <td>${u.username }</td>
	  		 <td>${u.password}</td>
  		</tr>
  	</c:forEach>
  </table>
  <a href="${pageContext.request.contextPath }/upload.jsp">文件上传页面</a>
  </body>
</html>

(3)成功页面(略)

8.struts.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true"></constant>
<constant name="struts.ui.theme" value="simple"></constant>
<package name="default" extends="struts-default" namespace="/">
	<!-- 拦截器 -->
	<interceptors>
		<interceptor name="LoginInterceptor" class="cn.itcast.web.interceptor.LoginInterceptor"></interceptor>
		<interceptor-stack name="myInterceptor">
			<interceptor-ref name="defaultStack"></interceptor-ref>
			<interceptor-ref name="LoginInterceptor"></interceptor-ref>
		</interceptor-stack>
	</interceptors>
	<!-- 全局 -->
	<global-results>
		<result name="login">/login.jsp</result>
		<result></result>
	</global-results>
	<global-exception-mappings>
		<exception-mapping result="error" exception="java.lang.RuntimeException"></exception-mapping>
	</global-exception-mappings>
	<!-- ########################################################################### -->
	<action name="userLogin" class="cn.itcast.web.action.UserLoginAction" method="execute">
		<result type="redirectAction">list</result>
		<result name="fail">/login.jsp</result>
	</action>
	
	<action name="list" class="cn.itcast.web.action.UserAction" method="execute">
		<interceptor-ref name="myInterceptor"></interceptor-ref>
		<result>/list.jsp</result>
	</action>
</package>
</struts>