package Dao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import Bean.login;import Util.DBUtil;public class loginDao { private static String user = "aaa"; Connection con = null; PreparedStatement stmd = null; ResultSet rs = null; public ?Bean.login login(String user) throws SQLException{ //String user1 = "'aaa'"; System.out.println("ld2");//static Bean.login根據提示修改 String sql = "select * from user where name =?"; System.out.println("ld3"); con = DBUtil.getConnection(); System.out.println("ld4"); stmd = con.prepareStatement(sql); stmd.setString(1,user); System.out.println("ld5"); rs = stmd.executeQuery(); System.out.println("ld6");while(rs.next()){ System.out.println("ld7"); login u = new login(); System.out.println("ld8"); ? ? u.setUser(rs.getString("name")); ? ? u.setPassword(rs.getString("password")); ? ? System.out.println("ld9"); ? ? return null; } return null; } public static void main(String[] args){ loginDao ld = new loginDao(); try { ld.login("aaa"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("ld1"); } }