使用Eclipse+MyEclipse+MySql开发一个用户注册登录模块

原文地址：使用Eclipse+MyEclipse+MySql开发一个用户注册登录模块作者：Joan

1.开启Eclipse，单击Flie→New→Web Project。

2.在Project Name文本框中写入logindemo其它保持默认选项单击Finish按钮。此时在Package Explorer(包浏览器)中出现我们新建的项目，把项目展开在src文件夹上单击右键选择New→Package出现New Java Package对话框。

3.在Name文本框中写入register单击Finish按钮。在src文件夹中新建了一个register包，用同样的方法在src文件夹中建一个login包。右键单击register包选择New→Class出现New Java Class对话框。

4.在Name文本框中填写Register单击Finish按钮。在register包下生成Register.java文件，更改其内容如下：

 

package register;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
//import com.mysql.jdbc.*;

public class Register  extends HttpServlet{ 
    private String name;
    private String pass;
    private String confirm;

  public synchronized void doPost(HttpServletRequest request,HttpServletResponse response)
                        throws ServletException,IOException
   {

       this.name=request.getParameter("account");
       this.pass=request.getParameter("password");
       this.confirm=request.getParameter("confirm");
       PrintWriter out=response.getWriter();

       //驱动程序名
       String driverName="com.mysql.jdbc.Driver";
       //数据库用户名
       String userName="root";
       //密码
       String userPasswd="123456";
       //数据库名
       String dbName="database";
       //表名
       String tableName="users";
       //联结字符串
       String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;
      try
      {
       Class.forName("org.gjt.mm.mysql.Driver");
       Connection connection=DriverManager.getConnection(url);
       Statement statement = connection.createStatement();
      
       String sql="SELECT * FROM "+tableName;
       ResultSet rs=statement.executeQuery(sql);
      
       while(true) 
       {
           if(rs.next())
           {
                if(this.name.equals(rs.getString(1)))
                {             
                   out.print("

"+"User Name is in Database!");              
                   break;