/////////////////////////////////////////////////////////////////////////////////////////////////////用户登录/////////////////////////////////////////////////////////////////////////////////////////////////////packagecom.newer.property;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.sql.*;importjava.sql.Statement;importjava.sql.ResultSet;importjavax.swing.JButton;importjavax.swing.JLabel;importjavax.swing.JTextField;importjavax.swing.JPasswordField;importjavax.swing.JPanel;importjavax.swing.JFrame;publicclassuser_landextendsJFrameimplementsActionListener{staticConnectionconn=null;staticStatementstat=null;staticResultSetrs=null;staticStringurl="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=_Property";staticStringuser="sa";staticStringpassword="";JPanelp1,p2,p3,p4,p5;JLabellbl1,lbl2,lbl3,lbl4;JTextFieldtxt_name;JPasswordFieldtxt_pwd;JButtonbtn1,btn2,btn3;static{try{Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");}catch(Exceptione){System.out.println("加载驱动失败");e.printStackTrace();}}publicuser_land(){this.setTitle("固定资产及设备用户登录");p1=newJPanel();p2=newJPanel();p3=newJPanel();p4=newJPanel();p5=newJPanel();lbl1=newJLabel("欢迎登录");lbl2=newJLabel("用户名：");lbl3=newJLabel("密码：");lbl4=newJLabel();txt_name=newJTextField(10);txt_pwd=newJPasswordField(10);btn1=newJButton("登录");btn2=newJButton("清空");btn3=newJButton("退出");p1.add(lbl1);p2.add(lbl2);p2.add(txt_name);p3.add(lbl3);p3.add(txt_pwd);p4.add(btn1);p4.add(btn2);p4.add(btn3);p5.add(lbl4);this.setLayout(newGridLayout(5,1));this.add(p1);this.add(p2);this.add(p3);this.add(p4);this.add(p5);this.setBounds(400,300,400,300);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setVisible(true);//添加按钮登录事件btn1.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){if((txt_name.getText().equals("")==true)(txt_pwd.getText().equals("")==false))lbl4.setText("登录失败，用户名不能为空");if((txt_name.getText().equals("")==false)(txt_pwd.getText().equals("")==true))lbl4.setText("登录失败，密码不能为空");if((txt_name.getText().equals("")==true)(txt_pwd.getText().equals("")==true))lbl4.setText("登录失败，用户名/密码不能为空");if(is_Property()){newSys_interface().show();}elseif((txt_name.getText().equals("")==false)(txt_pwd.getText().equals("")==false))lbl4.setText("登录失败，用户名/密码错误");}});btn1.addActionListener(this);//清空用户名和密码btn2.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){txt_name.setText(null);txt_pwd.setText(null);lbl4.setText(null);}});//退出btn3.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){System.exit(0);}});}protectedvoiduser_land(ObjectsetVisible){//TODOAuto-generatedmethodstub}publicbooleanis_Property(){try{conn=DriverManager.getConnection(url,user,password);//System.out.println("连接成功");stat=conn.createStatement();Stringsql="select*fromAdmin_Info";rs=stat.executeQuery(sql);while(rs.next()){//System.out.println(rs.getString("A_name")+"\t"+rs.getString("A_pwd"));Stringname=txt_name.getText();Stringpwd=txt_pwd.getText();if(name.equals(rs.getString("A_name"))pwd.equals(rs.getString("A_pwd"))){//System.out.println("登录成功！！");returntrue;}}}catch(SQLExceptione){System.out.println("连接失败!!!");e.printStackTrace();}//关闭数据库fi...