EJB实现登录功能

叁歲伎倆 2022-05-10 10:12 258阅读 0赞

### 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>

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

<%@ 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">
    	
      </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>

<%@ 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">
    	
      </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>