标签：lex doget 好的 setattr 成功 int turn cal ror
要求：
完成Java Web项目开发环境的安装：
JDK的安装
Tomcat的安装
MyEclipse的安装(包括MyEclipse用激活工具激活)
在MyEclipse中配置Tomcat、配置Tomcat的JDK、测试MyEclipse中配置的Tomcat是否配置成功
安装mysql的服务器端、安装mysql的图形用户界面
在安装好的图形用户界面中连接mysql服务器并创建一个数据库，在数据库中创建一个user表（包含username、password、status、age、address五个字段，增加五条记录）
创建一个Web Project，基于MVC设计模式，使用JSP/Servlet及JDBC实现读取数据库user表中存放的数据并以表格的形式展示在页面上的功能。
ConnectionFactory.java
1 public class ConnectionFactory { 2 private static Connection conn; 3 public static Connection getConn(){ 4 // 加载驱动类 5 try { 6 Class.forName("com.mysql.jdbc.Driver"); 7 // 建立与数据库的连接 8 conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/demo?useUnicode=true&" + 9 "characterEncoding=utf-8", "root", "123"); 10 } catch (ClassNotFoundException e) { 11 // TODO Auto-generated catch block 12 e.printStackTrace(); 13 } catch (SQLException e) { 14 // TODO Auto-generated catch block 15 e.printStackTrace(); 16 } 17 18 return conn; 19 } 20 }
User.java
1 public class User { 2 private String username; 3 private String password; 4 private int status; 5 public String getUsername() { 6 return username; 7 } 8 public void setUsername(String username) { 9 this.username = username; 10 } 11 public String getPassword() { 12 return password; 13 } 14 public void setPassword(String password) { 15 this.password = password; 16 } 17 public int getStatus() { 18 return status; 19 } 20 public void setStatus(int status) { 21 this.status = status; 22 } 23 24 }
UserDao.java
1 public class UserDao { 2 public User getUserByName(User user){ 3 // 建立连接 4 Connection conn = ConnectionFactory.getConn(); 5 String sql="select * from user where username = ?"; 6 // 获取预编译语句对象 7 try { 8 PreparedStatement ps = conn.prepareStatement(sql) ; 9 ps.setString(1, user.getUsername()); 10 ResultSet rs = ps.executeQuery(); 11 while(rs.next()){ 12 User result = new User(); 13 result.setUsername(rs.getString("username")); 14 result.setPassword(rs.getString("password")); 15 result.setStatus(rs.getInt("status")); 16 return result; 17 } 18 } catch (SQLException e) { 19 // TODO Auto-generated catch block 20 e.printStackTrace(); 21 } 22 return null; 23 } 24 }
UserService.java
1 public class UserService { 2 UserDao ud = new UserDao(); 3 public int getUserByName(User user){ 4 int flag = 0; 5 User result = ud.getUserByName(user); 6 if(result!=null && !"".equals(result)){ 7 if(result.getPassword().equals(user.getPassword())){ 8 if(result.getStatus()==0){ 9 flag = 0;//用户信息正在审核中 10 }else if(result.getStatus()==1){ 11 flag = 1;//用户信息审核通过 12 }else if(result.getStatus()==2){ 13 flag = 2;//用户信息审核未通过 14 } 15 }else{ 16 flag = 3;//用户密码错误 17 } 18 }else{ 19 flag = 4;//用户名错误 20 } 21 22 23 return flag; 24 } 25 }
LoginServlet.java
1 public class LoginServlet extends HttpServlet { 2 UserService us = new UserService(); 3 4 public void doGet(HttpServletRequest request, HttpServletResponse response) 5 throws ServletException, IOException { 6 7 response.setContentType("text/html"); 8 this.doPost(request, response); 9 } 10 11 /** 12 * The doPost method of the servlet. <br> 13 * 14 * This method is called when a form has its tag value method equals to post. 15 * 16 * @param request the request send by the client to the server 17 * @param response the response send by the server to the client 18 * @throws ServletException if an error occurred 19 * @throws IOException if an error occurred 20 */ 21 public void doPost(HttpServletRequest request, HttpServletResponse response) 22 throws ServletException, IOException { 23 24 response.setContentType("text/html;charset=utf-8"); 25 26 // 处理中文乱码 27 request.setCharacterEncoding("UTF-8"); 28 response.setCharacterEncoding("UTF-8"); 29 30 // 接受请求 31 String username = request.getParameter("username"); 32 String password = request.getParameter("password"); 33 34 // 把值封装到对象中 35 User user = new User(); 36 user.setUsername(username); 37 user.setPassword(password); 38 39 // 处理请求 40 int result = us.getUserByName(user); 41 42 // 实现跳转 43 if(result == 0){ 44 request.setAttribute("msg", "用户信息正在审核中！"); 45 request.getRequestDispatcher("login.jsp").forward(request, response); 46 }else if(result == 1){ 47 request.setAttribute("msg", "用户登录成功！"); 48 request.getRequestDispatcher("main.jsp").forward(request, response); 49 }else if(result == 2){ 50 request.setAttribute("msg", "用户信息审核失败！"); 51 request.getRequestDispatcher("login.jsp").forward(request, response); 52 }else if(result == 3){ 53 request.setAttribute("msg", "用户密码错误！"); 54 request.getRequestDispatcher("login.jsp").forward(request, response); 55 }else if(result == 4){ 56 request.setAttribute("msg", "用户名错误！"); 57 request.getRequestDispatcher("login.jsp").forward(request, response); 58 } 59 } 60 61 }
login.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>登录页面</title> 13 14 </head> 15 16 <body> 17 <div>提示信息：<%=request.getAttribute("msg") %></div> 18 <form action="loginServlet" method="post"> 19 <table> 20 <tr> 21 <td>用户名：</td> 22 <td><input type="text" name="username"/></td> 23 </tr> 24 <tr> 25 <td>密码：</td> 26 <td><input type="password" name="password"/></td> 27 </tr> 28 <tr> 29 <td></td> 30 <td><input type="submit" value="登陆"/></td> 31 </tr> 32 </table> 33 34 </form> 35 </body> 36 </html>
main.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>登录页面</title> 13 14 </head> 15 16 <body> 17 登录成功！<br/> 18 欢迎<%=request.getParameter("username") %>登录！ 19 20 </body> 21 </html>
标签：lex doget 好的 setattr 成功 int turn cal ror
原文地址：http://www.cnblogs.com/anstoner/p/6125418.html
