用java編程實(shí)現(xiàn)用戶(hù)注冊(cè)并進(jìn)行登錄操作

String username = "",password = "",passwordagain = ""; // 定義用戶(hù)名和密碼

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將該變量等于為全局變量 或局部變量即可

java語(yǔ)言實(shí)現(xiàn)用戶(hù)注冊(cè)和登錄

//這個(gè)是我寫(xiě)的，里面有連接數(shù)據(jù)庫(kù)的部分。你可以拿去參考一下

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.sql.*;

class LoginFrm extends JFrame implements ActionListener// throws Exception

{

JLabel lbl1 = new JLabel("用戶(hù)名:");

JLabel lbl2 = new JLabel("密碼:");

JTextField txt = new JTextField(5);

JPasswordField pf = new JPasswordField();

JButton btn1 = new JButton("確定");

JButton btn2 = new JButton("取消");

public LoginFrm() {

this.setTitle("登陸");

JPanel jp = (JPanel) this.getContentPane();

jp.setLayout(new GridLayout(3, 2, 5, 5));

jp.add(lbl1);

jp.add(txt);

jp.add(lbl2);

jp.add(pf);

jp.add(btn1);

jp.add(btn2);

btn1.addActionListener(this);

btn2.addActionListener(this);

}

public void actionPerformed(ActionEvent ae) {

if (ae.getSource() == btn1) {

try {

Class.forName("com.mysql.jdbc.Driver");// mysql數(shù)據(jù)庫(kù)

Connection con = DriverManager.getConnection(

"jdbc:mysql://localhost/Car_zl", "root", "1");// 數(shù)據(jù)庫(kù)名為Car_zl，密碼為1

System.out.println("com : "+ con);

Statement cmd = con.createStatement();

String sql = "select * from user where User_ID='"

+ txt.getText() + "' and User_ps='"

+ pf.getText() + "'" ;

ResultSet rs = cmd

.executeQuery(sql);// 表名為user，user_ID和User_ps是存放用戶(hù)名和密碼的字段名

if (rs.next()) {

JOptionPane.showMessageDialog(null, "登陸成功！");

} else

JOptionPane.showMessageDialog(null, "用戶(hù)名或密碼錯(cuò)誤！");

} catch (Exception ex) {

}

if (ae.getSource() == btn2) {

System.out.println("1111111111111");

//txt.setText("");

//pf.setText("");

System.exit(0);

}

}

}

public static void main(String arg[]) {

JFrame.setDefaultLookAndFeelDecorated(true);

LoginFrm frm = new LoginFrm();

frm.setSize(400, 200);

frm.setVisible(true);

}

}

java代碼寫(xiě)注冊(cè),注冊(cè)完成后,怎么寫(xiě)提示注冊(cè)成功

Java寫(xiě)提示注冊(cè)成功的方法如下：

1、首先用戶(hù)注冊(cè)完成后，返回一個(gè)boolean值的變量；

2、利用Servlet類(lèi)判斷這個(gè)變量，如果為true，跳轉(zhuǎn)到提示界面，提示用戶(hù)注冊(cè)成功，如果為false，跳轉(zhuǎn)到提示界面，提示用戶(hù)注冊(cè)失??；

3、具體代碼如下所示：

public?class?DemoServlet?extends?HttpServlet?{

public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)

throws?ServletException,?IOException?{

String?username?=?request.getParameter("username");

String?usepwd=?request.getParameter("usepwd");

boolean?flag?=?Dao.register(username,usepwd);//注冊(cè)方法

if(flag){

//提示注冊(cè)成功

request.getRequestDispatcher("/success.jsp").forward(request,?response);

}else{

//提示注冊(cè)失敗

request.getRequestDispatcher("/success.jsp").forward(request,?response);

}

}

public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)

throws?ServletException,?IOException?{

doGet(request,?response);

}

}

4、至此，就完成了提示注冊(cè)成功的功能。