Java登录界面的实现（注册、登录、背景图片）

*/
* Copyright (c) 2016，烟台大学计算机与控制工程学院
* All rights reserved.
* 文件名：text.java
* 作者：常轩
* 微信公众号：Worldhello
* 完成日期：2016年12月27日
* 版本号：V1.0
* 程序输入：无
* 程序输出：见运行结果
*/

/*功能描述：
登录界面有插入了背景图片
实现了登录界面GUI，可以进行 账号注册，和账号登录，对注册的账号用文件进行存储
*/
package com.xuan.main;
//登录界面
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class denglu extends JFrame {
//设置一个含有背景图片的面板
private MyPanel panel;
private JLabel lab_zhanghao = new JLabel("账号:");
private JTextField jta_text = new JTextField();
Font lab = new Font("楷体",1,30);
private JLabel lat_password = new JLabel("密码:");
Font lat  = new Font("楷体",1,30);
private JPasswordField jtb_text = new JPasswordField();
private JButton btn_register = new JButton("注册");
private JButton btn_land = new JButton("登陆");
Font btn = new Font("黑体",2,30);
public static  int pd = 0;
public static String ak1, ak2;
private Container contentPane = this.getContentPane();

public denglu () {
this.setSize(400,267);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.setTitle("登陆");
this.setResizable(false);
btn_register.addActionListener(new ActionListener() {
@SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent e) {
pd = 1;
ak1 = jta_text .getText();
ak2 = jtb_text .getText();
String fileName = "users.dat";
try {
FileWriter writer = new FileWriter(fileName,true);
BufferedWriter outWriter=new BufferedWriter(writer);
outWriter.write("ID:"+ak1+"&&"+"Password:"+ak2);
outWriter.newLine();
outWriter.close();
writer.close();
} catch (IOException e1) {
e1.printStackTrace();
}
jta_text.setText("");
jtb_text.setText("");
JOptionPane.showMessageDialog(null,"注册成功！ 您的用户名是："+ak1+"密码是："+ ak2);
}
});
btn_land.addActionListener(new ActionListener() {
@SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent e) {

if(pd==1||pd==0) {
File fileName=new File("users.dat");
try{
FileReader inOne=new FileReader(fileName);
BufferedReader inTwo=new BufferedReader(inOne);
String s=null;
int judge=1;
while((s=inTwo.readLine())!=null)
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("ID:");
stringBuilder.append(jta_text.getText());
stringBuilder.append("&&");
stringBuilder.append("Password:");
stringBuilder.append(jtb_text.getText());
String ak=stringBuilder.toString();

if(s.equals(ak)) {
JOptionPane.showMessageDialog(null, "登录成功！");
jta_text .setText("");
jtb_text .setText("");
judge=0;

break;
}
}
inTwo.close();
inOne.close();
if(judge==1) {
JOptionPane.showMessageDialog(null,"登陆失败！检查账号密码是否正确或请注册后登录",null,JOptionPane.ERROR_MESSAGE, null);
jta_text .setText("");
jtb_text .setText("");
}
if(judge==0){
new JMFMediaPlayer("JMF媒体播放器");  //在此处new出新的窗口
dispose();
return;
}
}catch(IOException event){
JOptionPane.showMessageDialog(null,"系统错误"+event,null,JOptionPane.ERROR_MESSAGE, null);
}
}
}

});

init();

panel = new MyPanel();
//将所有的组件添加到panel面板中
panel.add(lab_zhanghao);
panel.add(lat_password);
panel.add(jta_text);
panel.add(jtb_text);
panel.add(btn_register);
panel.add(btn_land);
panel.setLayout(null);

getContentPane().add(panel);
}
private void init() {
lab_zhanghao.setSize(200,100);
lab_zhanghao. setLocation(50,20);
lab_zhanghao.setFont(lab);
lat_password.setSize(200,100);
lat_password.setLocation(50,80);
lat_password.setFont(lat);
jta_text.setSize(190,30);
jta_text.setLocation(160,55);
jtb_text.setSize(190,30);
jtb_text.setLocation(160,115);
btn_register.setSize(120, 40);
btn_register.setLocation(60, 180);
btn_land.setSize(120, 40);
btn_land.setLocation(230, 180);
btn_register.setFont(btn);
btn_land.setFont(btn);
}

public static void main(String[] args)
throws ClassNotFoundException,
InstantiationException, IllegalAccessException,
UnsupportedLookAndFeelException {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
new denglu().setVisible(true);
}
}

package com.xuan.main;
//登录界面背景
import java.awt.*;
import javax.swing.*;

//自定义一个面板类
class MyPanel extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
//绘制一张背景图片  2.jpg是图片的路径  自己设定为自己想要添加的图片
Image image = new ImageIcon("background.jpg").getImage();
g.drawImage(image, 0, 0, this);
}
}