JAVA GUI 开发---登录界面加载背景图片

 

 

package com.ycty.totlosystem.gui.test;

import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class LoginJFrameTest {
 private JFrame jframe;
 private JLabel jlabel,jlabel1;
 private GridBagLayout gridbag;
 private GridBagConstraints constraints;
 private JTextField jtfield1;
 private JPasswordField jpfield1;
 private JButton jbutton1,jbutton2,jbutton3;
 private JPanel jpanel;
  
 public LoginJFrameTest(){
  jframe = new JFrame();
  jlabel = new JLabel();
  jlabel1 = new JLabel();
  jtfield1 = new JTextField();
  jpfield1 = new JPasswordField();
  gridbag = new GridBagLayout();
  jbutton1 = new JButton();
  jbutton2 = new JButton();
  jbutton3 = new JButton();
  
  init();
 }
 
 /**
  * init()初始化并显示界面
  */
 
 private void init(){
  
  jframe.setTitle("全屏幕测试");
  
  jpanel = new JPanel(){
   @Override
   protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    ImageIcon img = new ImageIcon(ImgJframeTest.class.getResource("\\img\\2.jpg"));
    img.paintIcon(this, g, 0, 0);
   }
  };
  
  jlabel.setText("用户名：");
  jlabel1.setText("密    码：");
  jbutton1.setText("登    录");
  jbutton2.setText("退    出");
  jbutton3.setText("更改密码");
  
  //设置JFrame为全屏
  jframe.setUndecorated(true);
  jframe.getGraphicsConfiguration().getDevice().setFullScreenWindow(jframe);
  
  //设置JPanel为透明，且使用GridBagLayout布局管理器
  jpanel.setOpaque(true);
  jpanel.setLayout(gridbag);
  
     //用户名文本框显示
     constraints = getGridBagConstraints(0,0,1,1,0,0,GridBagConstraints.CENTER,
        GridBagConstraints.NONE,new Insets(10,0,10,0),0,0);
    
     gridbag.setConstraints(jlabel, constraints);
  jpanel.add(jlabel);
  
  //用户名输入框显示
     constraints = getGridBagConstraints(1,0,1,1,0,0,GridBagConstraints.CENTER,
        GridBagConstraints.NONE,new Insets(10,0,10,0),100,0);
   
     gridbag.setConstraints(jtfield1, constraints);
     jpanel.add(jtfield1);
     
     //密码文本框显示
     constraints = getGridBagConstraints(0,1,1,1,0,0,GridBagConstraints.CENTER,
       GridBagConstraints.NONE,new Insets(10,0,10,0),0,0);
     gridbag.setConstraints(jlabel1, constraints);
     jpanel.add(jlabel1);
 
     //密码输入框显示
  constraints = getGridBagConstraints(1,1,1,1,0,0,GridBagConstraints.CENTER,
       GridBagConstraints.NONE,new Insets(10,0,10,0),100,0);

  gridbag.setConstraints(jpfield1, constraints);
  jpanel.add(jpfield1);
  
  //更改密码按钮显示
  constraints = getGridBagConstraints(0,2,1,1,0,0,GridBagConstraints.CENTER,
       GridBagConstraints.NONE,new Insets(10,0,10,0),0,0);

  gridbag.setConstraints(jbutton3, constraints);
  jpanel.add(jbutton3);
  
  //登录按钮显示
  constraints = getGridBagConstraints(1,2,1,1,0,0,GridBagConstraints.CENTER,
       GridBagConstraints.NONE,new Insets(10,0,10,0),0,0);

  gridbag.setConstraints(jbutton1, constraints);
  jpanel.add(jbutton1);

  //退出按钮显示
  constraints = getGridBagConstraints(2,2,1,1,0,0,GridBagConstraints.CENTER,
       GridBagConstraints.NONE,new Insets(10,0,10,0),0,0);

  gridbag.setConstraints(jbutton2, constraints);
  jpanel.add(jbutton2);
  
  jframe.add(jpanel);
 }
 
 private static GridBagConstraints getGridBagConstraints(int gridx,int gridy,int gridwidth,
   int gridheight,double weightx,double weighty,int anchor,int fill,Insets insets,
   int ipadx,int ipady){

   return new GridBagConstraints(gridx, gridy, gridwidth, gridheight, weightx, weighty,
     anchor, fill, insets, ipadx, ipady);
 }
 
 public void showMe(){
  jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  jframe.setVisible(true);
 }
 
 public static void main(String[] args) {
  new LoginJFrameTest().showMe();
 }
}