EJB实现登录功能
环境
MyEclipse 8.6 + JBoss 6.0 + JDK 1.6.13 + EJB 3.0
问题
EJB实现登录
解决
1. 配置JBoss数据源
a) 数据源参考配置文件
jboss-6.0.0.Final/docs/examples/jca/**-ds.xml
b) 将配置文件放到站点根目录下
jboss-6.0.0.Final/server/default/deploy
c) 将connector加入站点
server/default/lib
d) 配置相关的参数
<jndi-name>MySqlDS</jndi-name>
<connection-url>jdbc:mysql://xxx:3306/xxx</connection-url>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<user-name>xxx</user-name>
<password>xxx</password>
e) 启动JBoss
2. 创建数据库表
CREATE TABLE user ( id int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, name varchar(255) DEFAULT NULL, password varchar(255) DEFAULT NULL, );
3. 编写实体Bean
User.java
package com.wgb.bean.entity;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import com.wgb.bean.UserListener;
/**
* @className: User.java
* @classDescription:
* @function:
* @author: Wentasy
* @createTime: 2012-12-4 下午08:00:32
* @modifyTime:
* @modifyReason:
* @since: JDK 1.6
*/
@Entity
@EntityListeners(UserListener.class)
public class User implements Serializable{
private int id;
private String name;
private String password;
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
4. 创建对数据库进行操作的Session Bean
UserDao.java
package com.wgb.dao;
import java.util.List;
import com.wgb.bean.entity.User;
/**
* @className: UserDao.java
* @classDescription:
* @function:
* @author: Wentasy
* @createTime: 2012-12-4 下午08:02:46
* @modifyTime:
* @modifyReason:
* @since: JDK 1.6
*/
public interface UserDao {
public boolean login(String name, String password);
}
UserDaoImpl.java
package com.wgb.dao.impl;
import java.util.Iterator;
import java.util.List;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.wgb.bean.entity.User;
import com.wgb.dao.UserDao;
/**
* @className: UserDaoImpl.java
* @classDescription:
* @function:
* @author: Wentasy
* @createTime: 2012-12-4 下午08:03:25
* @modifyTime:
* @modifyReason:
* @since: JDK 1.6
*/
@Stateless
@Remote ({UserDao.class})
public class UserDaoImpl{
@PersistenceContext
private EntityManager em;
@SuppressWarnings("unchecked")
public boolean login(String name, String password) {
boolean isValid = false;
Query query = em.createQuery("from User u where u.name=?1 and u.password=?2");
// Query query = em.createNativeQuery("select * from user u where u.id = ?");
query.setParameter(1, name);
query.setParameter(2, password);
List<User> list = query.getResultList();
if(list.isEmpty()){
isValid = false;
}else{
isValid = true;
}
// Iterator<User> it = list.iterator();
// while(it.hasNext()){
// User u = it.next();
// if(u.getName().equals(name) && u.getPassword().equals(password)){
// isValid = true;
// }
// }
return isValid;
}
}
5. 编写登录界面
login.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>登录页面</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>登录</h1>
<form action=<%=path %>/servlet/LoginAction method="post">
用户名：<input type="text" name="username"><br>
密 码：<input type="password" name="passwd"><br>
<input type="submit" value="登录">
<input type="reset" value="重置">
</form>
</body>
</html>
login_suc.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>登录成功页面</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>
<P><font color="red" align="center" size="+1">恭喜您！登录成功！</font></P>
<%
String username = request.getParameter("username");
String password = request.getParameter("passwd");
%>
<%
out.println("姓名：" + username);
%>
<br>
<%
out.println("输入密码：" + password);
%>
</body>
</html>
6. 编写对登录进行处理的Servlet
LoginAction
package com.wgb.bean;
import java.io.IOException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.wgb.dao.UserDao;
import com.wgb.dao.impl.UserDaoImpl;
public class LoginAction extends HttpServlet {
/**
* Constructor of the object.
*/
public LoginAction() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("username");
System.out.println(name);
String pwd = request.getParameter("passwd");
System.out.println(pwd);
UserDao userDao = null;
try {
InitialContext ctx = new InitialContext();
userDao = (UserDao)ctx.lookup("UserDaoImpl/remote");
} catch (NamingException e) {
e.printStackTrace();
}
if(userDao.login(name, pwd)){
request.getRequestDispatcher("/wgb/login_suc.jsp").forward(request, response);
}else{
request.getRequestDispatcher("/wgb/login.jsp").forward(request, response);
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
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">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>LoginAction</servlet-name>
<servlet-class>com.wgb.bean.LoginAction</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginAction</servlet-name>
<url-pattern>/servlet/LoginAction</url-pattern>
</servlet-mapping>
</web-app>