Java 在JPanel上显示BuffereImage_Java_Image_Swing_Javax.imageio

Java 在JPanel上显示BuffereImage

java image swing

Java 在JPanel上显示BuffereImage,java,image,swing,javax.imageio,Java,Image,Swing,Javax.imageio,我需要用Netbeans在JPanel上显示BufferedImage。我使用Netbeans的拖放功能添加面板。然后我添加代码在面板上显示图像。这是我的密码： BufferedImage img = null; try { img = ImageHelper.loadImage(path); } catch (IOException ex) { Logger.getLogger(MainGUI.class.getName()).log(Level.SEVERE, null, e

我需要用Netbeans在

JPanel

上显示

BufferedImage

。我使用Netbeans的拖放功能添加面板。然后我添加代码在面板上显示图像。这是我的密码：

BufferedImage img = null;
try {
    img = ImageHelper.loadImage(path);
} catch (IOException ex) {
    Logger.getLogger(MainGUI.class.getName()).log(Level.SEVERE, null, ex);
}
ImageIcon icon = new ImageIcon(img);
JLabel picLabel = new JLabel(icon);

//imagePlace is JPanel
imagePlace.add(picLabel);
imagePlace.repaint();

但它没有在面板上画出图像。我学习了一些教程，但一点也不学习。您能否举例说明在

JPanel

上显示

buffereImage

的正确方法

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package tubes;

import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import static jdk.nashorn.tools.ShellFunctions.input;

/**
 *
 * @author ivan
 */
public class MainGUI extends javax.swing.JFrame {

/**
 * Creates new form MainGUI
 */
public MainGUI() {
    initComponents();        
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jTabbedPane1 = new javax.swing.JTabbedPane();
    jPanel1 = new javax.swing.JPanel();
    openImageBtn = new javax.swing.JButton();
    imagePlace = new javax.swing.JPanel();
    canvas1 = new java.awt.Canvas();
    jPanel2 = new javax.swing.JPanel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jPanel1.setPreferredSize(new java.awt.Dimension(512, 512));

    openImageBtn.setText("Open Image");
    openImageBtn.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            openImageBtnActionPerformed(evt);
        }
    });

    imagePlace.setBackground(new java.awt.Color(254, 254, 254));

    javax.swing.GroupLayout imagePlaceLayout = new javax.swing.GroupLayout(imagePlace);
    imagePlace.setLayout(imagePlaceLayout);
    imagePlaceLayout.setHorizontalGroup(
        imagePlaceLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 178, Short.MAX_VALUE)
    );
    imagePlaceLayout.setVerticalGroup(
        imagePlaceLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 194, Short.MAX_VALUE)
    );

    canvas1.setBackground(new java.awt.Color(255, 0, 0));

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addComponent(openImageBtn)
                    .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addComponent(imagePlace, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 253, Short.MAX_VALUE)
                    .addComponent(canvas1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(80, 80, 80))))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(openImageBtn)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(imagePlace, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(96, 96, 96)
                    .addComponent(canvas1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
            .addContainerGap(144, Short.MAX_VALUE))
    );

    jTabbedPane1.addTab("tab1", jPanel1);

    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
    jPanel2.setLayout(jPanel2Layout);
    jPanel2Layout.setHorizontalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 523, Short.MAX_VALUE)
    );
    jPanel2Layout.setVerticalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 387, Short.MAX_VALUE)
    );

    jTabbedPane1.addTab("tab2", jPanel2);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(20, 20, 20)
            .addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 535, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(108, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap(25, Short.MAX_VALUE)
            .addComponent(jTabbedPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 430, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap())
    );

    pack();
}// </editor-fold>                        

private void openImageBtnActionPerformed(java.awt.event.ActionEvent evt) {                                             
    // TODO add your handling code here:
    JFileChooser fileChooser = new JFileChooser();
    fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
    int result = fileChooser.showOpenDialog(this);
    if (result == JFileChooser.APPROVE_OPTION) {
        File selectedFile = fileChooser.getSelectedFile();
        String path = selectedFile.getAbsolutePath();
        System.out.println(path);
        BufferedImage img = null;
        try {
            img = ImageHelper.loadImage(path);
        } catch (IOException ex) {
            Logger.getLogger(MainGUI.class.getName()).log(Level.SEVERE, null, ex);
        }
        ImageIcon icon = new ImageIcon(img);
        JLabel label = new JLabel("", icon, JLabel.CENTER);
        JLabel picLabel = new JLabel(icon);
        imagePlace.add(picLabel);
        imagePlace.repaint();
    }
}                                            

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(MainGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(MainGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(MainGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(MainGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new MainGUI().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private java.awt.Canvas canvas1;
private javax.swing.JPanel imagePlace;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JTabbedPane jTabbedPane1;
private javax.swing.JButton openImageBtn;
// End of variables declaration                   
}

/*
*要更改此许可证标题，请在“项目属性”中选择“许可证标题”。
*要更改此模板文件，请选择工具|模板
*然后在编辑器中打开模板。
*/
包装管；
导入java.awt.BorderLayout；
导入java.awt.Graphics；
导入java.awt.Graphics2D；
导入java.awt.image.buffereImage；
导入java.io.File；
导入java.io.IOException；
导入java.util.logging.Level；
导入java.util.logging.Logger；
导入javax.swing.ImageIcon；
导入javax.swing.JFileChooser；
导入javax.swing.JLabel；
导入静态jdk.nashorn.tools.ShellFunctions.input；
/**
*
*@作者伊万
*/
公共类MainGUI扩展了javax.swing.JFrame{
/**
*创建新表单MainGUI
*/
公共MainGUI（）{
初始化组件（）；
}
/**
*从构造函数中调用此方法来初始化表单。
*警告：不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告（“未选中”）
//                           
私有组件（）{
jTabbedPane1=newjavax.swing.JTabbedPane（）；
jPanel1=newjavax.swing.JPanel（）；
openImageBtn=newjavax.swing.JButton（）；
imagePlace=newjavax.swing.JPanel（）；
canvas1=newjava.awt.Canvas（）；
jPanel2=newjavax.swing.JPanel（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
setPreferredSize（新的java.awt.Dimension（512512））；
openImageBtn.setText（“打开图像”）；
openImageBtn.addActionListener（新的java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
openImageBtnActionPerformed（evt）；
}
});
setBackground（新java.awt.Color（254,254,254））；
javax.swing.GroupLayout imagePlaceLayout=新建javax.swing.GroupLayout（imagePlace）；
设置布局（imagePlaceLayout）；
imagePlaceLayout.setHorizontalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGap（0，178，短。最大值）
);
imagePlaceLayout.setVerticalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGap（0，194，短。最大值）
);
canvas1.setBackground（新java.awt.Color（255,0,0））；
javax.swing.GroupLayout jPanel1Layout=新的javax.swing.GroupLayout（jPanel1）；
setLayout（jPanel1Layout）；
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jpanellayout.createSequentialGroup（）
.addContainerGap（）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jpanellayout.createSequentialGroup（）
.addComponent（openImageBtn）
.addContainerGap（javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u VALUE））
.addGroup（jpanellayout.createSequentialGroup（）
.addComponent（imagePlace，javax.swing.GroupLayout.PREFERRED\u大小，javax.swing.GroupLayout.DEFAULT\u大小，javax.swing.GroupLayout.PREFERRED\u大小）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED，253，Short.MAX_值）
.addComponent（canvas1，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addGap（80,80,80）））
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jpanellayout.createSequentialGroup（）
.addContainerGap（）
.addComponent（openImageBtn）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jpanellayout.createSequentialGroup（）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED）
.addComponent（imagePlace，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE））
.addGroup（jpanellayout.createSequentialGroup（）
.addGap（96,96,96）
.addComponent（canvas1，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）））
.addContainerGap（144，简称最大值））
);
jTabbedPane1.addTab（“tab1”，jPanel1）；
javax.swing.GroupLayout jPanel2Layout=新的javax.swing.GroupLayout（jPanel2）；
设置布局（jPanel2布局）；
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGap（0，523，短。最大值）
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGap（0，387，短。最大值）
);
jTabbedPane1.addTab（“tab2”，jPanel2）；
javax.swing.GroupLayout=newjavax.swing.GroupLayout（getContentPane（））；
getContentPane（）.setLayout（布局）；
layout.setHorizontalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（layout.createSequentialGroup（）
.addGap（20,20,20）
.addComponent（jTabbedPane1，javax.swing.GroupLayout.PREFERRED_SIZE，535，javax.swing.GroupLayout.PREFERRED_SIZE）
.addContainerGap（108，简称最大值））
);
layout.setVerticalGroup(
layout.createP
    imagePlace.add(imgpnl);
    imagePlace.revalidate(); //added
    imagePlace.repaint();

javax.swing.GroupLayout imagePlaceLayout = new javax.swing.GroupLayout(imagePlace);
imagePlace.setLayout(imagePlaceLayout);