如何将图像设置为背景答案

【问题标题】：How do I set an image to a background如何将图像设置为背景
【发布时间】：2014-06-23 03:51:22
【问题描述】：

我正在尝试使用内容窗格 JPanel 创建一个简单的 JFrame。我想知道如何将图像设置为背景。我知道很多人已经问过这个问题，但是每当我尝试时都会遇到未解决的编译错误。最后，我在课堂上创建了一个全新的课程，但也有错误。我该怎么做呢？请帮忙。

package menu;

import java.awt.Color;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.ImageObserver;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;

import models.AskTheAdmiralFrame;

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
/**
 * 
 * @author Russell
 *
 */

public class HistoraskMenu extends JFrame {

private static final long serialVersionUID = 8106152174535131551L;
private static JPanel panel;
private JButton ATA = new JButton("Ask The Admiral");
public Color oldPaper = new Color(255, 230, 179); 
private JLabel label = new JLabel();
private final JLabel label_1 = new JLabel("");
private final ImageIcon bg = new ImageIcon("/Users/Russell/Desktop/Russell/Java/Coding"
            + "/eclipse workspace/Historask/resources/bg.jpg");
Image img = bg.getImage();

public HistoraskMenu(){
    setBounds(50, 50, 700, 500);    
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    setTitle("Historask");

    panel = new JPanel();

    setContentPane(panel);

    label.setHorizontalAlignment(SwingConstants.CENTER);    //Sets position of Historask sign
    label.setVerticalAlignment(SwingConstants.TOP);
    label.setBackground(new Color(238, 232, 170));          //Sets the colour of the foreground and background of Historask sign
    label.setForeground(oldPaper);
    label.setIcon(new ImageIcon("/Users/Russell/Desktop/Russell/Java/Coding"
            + "/eclipse workspace/Historask/resources/title.png"));
    label.setOpaque(true);
    label.setBounds(50, 10, 500, 50);
    getContentPane().add(label);

    panel.add(label_1);

    ATA.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent e) {            //What happens when you press ATA button
            new AskTheAdmiralFrame();
        }
    });

    getContentPane().add(ATA);

    setVisible(true);
}

public class panel extends JPanel{
    setLayout(new GridLayout(0, 1, 0, 0));

    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, this);
        super.paintComponents(g);
      }
}

【问题讨论】：

你遇到了什么错误，在哪一行？
在paintComponent中先调用super，然后绘制图像。
-1，这个问题经常被问到。 I know that a lot of people have a already asked this, but I get unresolved compilation errors whenever I try. - 然后修复错误。或者您可以随时搜索另一个示例。您是否查看了此页面右侧的“相关”标题？

标签： java image swing background jpanel

【解决方案1】：

如果您在 HistoraskMenu() 构造函数中引用面板对象，它不会绘制图像，因为您直接将其初始化为 JPanel。不如试试 panel = new panel();

【讨论】：