java实现背景图片添加（免费）

老实人不喜欢整那些没用的，来直接附源码。

需要注意的是：把你下载好的背景图片，直接复制粘贴到images文件下，当然该文件是自己创建的，名字自取。具体操作如下：

选中你创建的项目，new一个folder，名字命名为images即可。

 创建好文件images后，选中 images文件，粘贴图片即可（图中Paste）；

 源码如下：

package UseJLabel_to_set;


import java.awt.EventQueue;
import javax.swing.Jframe;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.JRadioButton;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import java.awt.Color;

public class ComponentBoundsTest extends Jframe {

	
	private static final long serialVersionUID = 1L;
	private JPanel contentPane;
	private JTextField jtf_username;
	private JTextField jtf_pwd;
	private JTextField textField_2;
	private JLabel jlb_background;
	private JLabel jlb_title;
	
	
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					ComponentBoundsTest frame = new ComponentBoundsTest();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	
	public ComponentBoundsTest() {
		setTitle("太原第一发电厂");
		setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);
		setBounds(100, 100, 600, 500);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		JLabel jlb_username = new JLabel("用户名");
		jlb_username.setFont(new Font("宋体", Font.PLAIN, 17));
		jlb_username.setBounds(150, 132, 67, 28);
		contentPane.add(jlb_username);
		
		JLabel jlb_pwd = new JLabel("密  码");
		jlb_pwd.setFont(new Font("宋体", Font.PLAIN, 17));
		jlb_pwd.setBounds(150, 188, 67, 28);
		contentPane.add(jlb_pwd);
		
		jtf_username = new JTextField();
		jtf_username.setBounds(227, 134, 170, 28);
		contentPane.add(jtf_username);
		jtf_username.setColumns(10);
		
		jtf_pwd = new JTextField();
		jtf_pwd.setBounds(227, 190, 170, 28);
		contentPane.add(jtf_pwd);
		jtf_pwd.setColumns(10);
		
		JRadioButton jrBtn_saveInfo = new JRadioButton("记住用户名和密码");
		jrBtn_saveInfo.setBounds(227, 306, 127, 25);
		contentPane.add(jrBtn_saveInfo);
		
		JButton btn_login = new JButton("登录");
		btn_login.setFont(new Font("宋体", Font.PLAIN, 18));
		btn_login.setBounds(227, 355, 127, 49);
		contentPane.add(btn_login);
		
		JLabel jlb_validcode = new JLabel("验证码");
		jlb_validcode.setFont(new Font("宋体", Font.PLAIN, 17));
		jlb_validcode.setBounds(150, 246, 58, 28);
		contentPane.add(jlb_validcode);
		
		textField_2 = new JTextField();
		textField_2.setBounds(227, 248, 87, 28);
		contentPane.add(textField_2);
		textField_2.setColumns(10);
		
		jlb_title = new JLabel("电厂职工培训信息管理系统");
		jlb_title.setForeground(Color.DARK_GRAY);
		jlb_title.setFont(new Font("宋体", Font.PLAIN, 22));
		jlb_title.setBounds(169, 36, 269, 40);
		contentPane.add(jlb_title);
		
		jlb_background = new JLabel
	(new ImageIcon("C:/Users/huashi/eclipse-workspace/set_backgroundText/images/background4.jpg"));
		jlb_background.setForeground(Color.DARK_GRAY);
		jlb_background.setBounds(0, 10, 595, 463);
		contentPane.add(jlb_background);
	}
	
}

效果如下图所示：

有问题欢迎大家一起讨论