java预览图片

『壹』 用java编写一个图片浏览器

稍麻烦一点，
下午给出代码

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import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.filechooser.FileNameExtensionFilter;

public class ImageView extends JFrame {

private boolean isSingle = true;
private JPanel panel = new JPanel();
private CardLayout card = null;
private File[] files = null;
private int fileIndex = 0;
private JPanel single = new JPanel();
private JPanel multiple = new JPanel();

public ImageView() {

setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(600, 450);
setResizable(false);
getContentPane().setLayout(null);

card = new CardLayout(0, 0);
panel.setLayout(card);
panel.setBounds(12, 46, 570, 328);
getContentPane().add(panel);

panel.add(single, "single");
single.setLayout(new BorderLayout(0, 0));

panel.add(multiple, "multiple");
multiple.setLayout(new GridLayout(2, 3, 0, 0));

JButton btnBrowse = new JButton("Browse...");
btnBrowse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter(
"JPG & GIF Images", "jpg", "gif");
chooser.setFileFilter(filter);
chooser.setMultiSelectionEnabled(true);
int returnVal = chooser.showOpenDialog(getContentPane());
if (returnVal == JFileChooser.APPROVE_OPTION) {
files = chooser.getSelectedFiles();
showPicture();
}
}
});
btnBrowse.setBounds(12, 10, 91, 21);
getContentPane().add(btnBrowse);

JButton btnSingle = new JButton("single");
btnSingle.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
isSingle = true;
card.show(panel, "single");
showPicture();
}
});
btnSingle.setBounds(115, 10, 91, 21);
getContentPane().add(btnSingle);

JButton btnMultiple = new JButton("multiple");
btnMultiple.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
isSingle = false;
card.show(panel, "multiple");
showPicture();
}
});
btnMultiple.setBounds(218, 10, 91, 21);
getContentPane().add(btnMultiple);

JButton btnPrevious = new JButton("previous");
btnPrevious.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (isSingle) {
fileIndex -= 1;
} else {
fileIndex -= 6;
}
showPicture();
}
});
btnPrevious.setBounds(92, 384, 91, 21);
getContentPane().add(btnPrevious);

JButton btnNext = new JButton("next");
btnNext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (isSingle) {
fileIndex += 1;
} else {
fileIndex += 6;
}
showPicture();
}
});
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setLocation((screenSize.width - getWidth()) / 2,
(screenSize.height - getHeight()) / 2);
btnNext.setBounds(423, 384, 91, 21);
getContentPane().add(btnNext);
setVisible(true);
}

private void showPicture() {

if (files == null || files.length == 0) {
return;
}
if (fileIndex > files.length || fileIndex < 0) {
fileIndex = 0;
}
PicturePanel canvas = null;
if (isSingle) {
if (single.getComponentCount() > 0) {
canvas = (PicturePanel) single.getComponent(0);
} else {
canvas = new PicturePanel();
single.add(canvas, BorderLayout.CENTER);
}
canvas.setPath(files[fileIndex].getPath());
canvas.repaint();
single.repaint();
} else {

for (int i = 0; i < 6; i++) {
if (files.length == fileIndex + i) {
break;
}

if (multiple.getComponentCount() > i) {
canvas = (PicturePanel) multiple.getComponent(i);
} else {
canvas = new PicturePanel();
multiple.add(canvas);
}
canvas.setPath(files[fileIndex + i].getPath());
canvas.repaint();
multiple.repaint();
}
}

panel.updateUI();
}

public static void main(String[] args) {
new ImageView();
}
}

class PicturePanel extends JPanel {

private Image image;

public PicturePanel() {
}

public void setPath(String filename) {
ImageIcon icon = new ImageIcon(filename);
this.image = icon.getImage();
}

public void paint(Graphics g) {
super.paint(g);
}

protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, 400, 300, this);
}
}

『贰』 java实现图片预览功能，可以显示缩列图，具有上下页的功能求技术支持

把图片按照规定的比例压缩，然后保存至FTP，列表读取缩略图，单击显示原图。

/**
*压缩图片方法一(高质量)
*@paramoldFile将要压缩的图片
*@paramwidth压缩宽
*@paramheight压缩高
*@paramsmallIcon压缩图片后,添加的扩展名(在图片后缀名前添加)
*@paramquality压缩质量范围：<i>0.0-1.0</i>高质量:<i>0.75</i>中等质量:<i>0.5</i>低质量:<i>0.25</i>
*@parampercentage是否等比压缩若true宽高比率将将自动调整
*/
publicstaticvoidcompressImage(StringoldFile,intwidth,intheight,StringsmallIcon,
floatquality,booleanpercentage){
try{
Filefile=newFile(oldFile);

//验证文件是否存在
if(!file.exists())
thrownewFileNotFoundException("找不到原图片!");

//获取图片信息
BufferedImageimage=ImageIO.read(file);
intorginalWidth=image.getWidth();
intorginalHeight=image.getHeight();

//验证压缩图片信息
if(width<=0||height<=0||!Pattern.matches("^[1-9]\d*$",String.valueOf(width))
||!Pattern.matches("^[1-9]\d*$",String.valueOf(height)))
thrownewException("图片压缩后的高宽有误!");

//等比压缩
if(percentage){
doublerate1=((double)orginalWidth)/(double)width+0.1;
doublerate2=((double)orginalHeight)/(double)height+0.1;
doublerate=rate1>rate2?rate1:rate2;
width=(int)(((double)orginalWidth)/rate);
height=(int)(((double)orginalHeight)/rate);
}

//压缩后的文件名
StringfilePrex=oldFile.substring(0,oldFile.lastIndexOf('.'));
StringnewImage=filePrex+smallIcon+oldFile.substring(filePrex.length());

//压缩文件存放位置
FilesavedFile=newFile(newImage);

//创建一个新的文件
savedFile.createNewFile();

//创建原图像的缩放版本
Imageimage2=image.getScaledInstance(width,height,Image.SCALE_AREA_AVERAGING);

//创建数据缓冲区图像
BufferedImagebufImage=newBufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

//创建一个Graphics2D
Graphics2Dg2=bufImage.createGraphics();

//重绘图像
g2.drawImage(image2,0,0,width,height,null);
g2.dispose();

//过滤像素矩阵
float[]kernelData={
-0.125f,-0.125f,-0.125f,
-0.125f,2,-0.125f,-0.125f,
-0.125f,-0.125f};
Kernelkernel=newKernel(3,3,kernelData);

//按核数学源图像边缘的像素复制为目标中相应的像素输出像素
ConvolveOpcOp=newConvolveOp(kernel,ConvolveOp.EDGE_NO_OP,null);

//转换像素
bufImage=cOp.filter(bufImage,null);

FileOutputStreamout=newFileOutputStream(savedFile);
JPEGImageEncoderencoder=JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParamparam=encoder.getDefaultJPEGEncodeParam(bufImage);

//设置压缩质量
param.setQuality(quality,true);
encoder.encode(bufImage,param);

out.close();
System.out.println(newImage);
}catch(Exceptione){
e.printStackTrace();
System.out.println("压缩失败!"+e.getMessage());
}
}

『叁』 java swing显示图片问题

publicclassImage{

privateJFramejf=newJFrame("");

publicstaticvoidmain(String[]args){

newImage().initial();

}

publicvoidinitial(){

jf.setLayout(newGridLayout(5,5));

for(inti=1;i<=5;i++){

for(intj=1;j<=5;j++){

inttemp=(i-1)*5+j;

Iconic1=newImageIcon("/D:/tupian/"+temp+".jpg");

JLabeljl2=newJLabel(ic1);

jf.add(jl2,i+"");

}

}

jf.setSize(500,500);

jf.setVisible(true);

}

}

代码是这样子了！你得指定个目录，目录下有25个图，并且命名为1.jpg.........25.jpg,实在不行你建个我打开的那个目录，也就是在盘建个tupian的文件夹，然后我把我测试的图也复杂给你，给个邮箱即OK，效果图如我插入的图片：

『肆』 请教java高手们，帮我写一个java编写的图片浏览器，功能如下：有自动浏览功能，每隔几秒图片自动翻页。用

//改编的，CopyOfImageViewer.java打开一个有图片的文件夹就可浏览了。

//MP3播放相关库到:http://www.javazoom.net/javalayer/sources.html下载

//将下载到的zip文件里的jl1.0.1.jar复制到JDK目录下的jre/lib/ext/目录里即可.

//将源代码main方法里的playMp3("d:\bad.mp3");改成自己的地址，换种方法BMP是可以支持的，这里不行暂不讨论。

importjava.awt.*;

importjava.awt.event.*;

importjava.io.*;

importjavax.swing.*;

importjavazoom.jl.player.Player;

,Runnable{

JPanelbts;

JLabelpl;

jscrollPanejsp;

JButtoncf,start,next,prev,stop;

JFramef;

JFileChooserfc;

File[]sf;

intindex;

Threadauto;

booleanautoFlag;

intdelay=5*1000;

//这里就是GUI布局

CopyOfImageViewer(){

pl=newJLabel();

pl.setHorizontalAlignment(JLabel.CENTER);

jsp=newJScrollPane(pl);

start=newJButton("start");

next=newJButton(">");

prev=newJButton("<");

stop=newJButton("stop");

bts=newJPanel(newFlowLayout(FlowLayout.CENTER));

bts.add(start);

bts.add(prev);

bts.add(next);

bts.add(stop);

cf=newJButton("Selectapicturefolder");

fc=newJFileChooser();

fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

f=newJFrame();

f.setDefaultCloseOperation(3);

f.getContentPane().add(cf,"North");

f.getContentPane().add(jsp,"Center");

f.getContentPane().add(bts,"South");

f.setSize(400,300);

f.setLocationRelativeTo(null);

f.setVisible(true);

//给按钮加入事件侦听器

start.addActionListener(this);

next.addActionListener(this);

prev.addActionListener(this);

stop.addActionListener(this);

cf.addActionListener(this);

auto=newThread(this);

auto.start();

}

publicstaticvoidmain(String[]args){

try{

UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

}catch(Exceptione){

try{

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

}catch(Exceptione2){}

}

newCopyOfImageViewer();

playMp3("d:\bad.mp3");

}

//简单MP3播放

privatestaticvoidplayMp3(Stringfile){

try{

Playerp=newPlayer(newFileInputStream(file));

p.play();

}catch(Exceptione){}

}

//处理各按键事件

publicvoidactionPerformed(ActionEvente){

Objectsrc=e.getSource();

if(src==cf){

into=fc.showOpenDialog(f);

if(o==JFileChooser.APPROVE_OPTION){

sf=fc.getSelectedFile().listFiles(newFilenameFilter(){

//合法的文件后缀

String[]suf={".PNG",".GIF",".JPG",};

publicbooleanaccept(Filedir,Stringname){

name=name.toUpperCase();

for(inti=0;i<suf.length;i++)

if(name.endsWith(suf[i]))returntrue;

returnfalse;

}

});

if(sf.length>0){

index=0;

showPic();

}

}

}

if(sf==null||sf.length==0)return;

if(src==start)startB();

elseif(src==stop)stopB();

elseif(src==next)next();

elseif(src==prev)prev();

}

voidprev(){

index=--index<0?sf.length-1:index;

showPic();

}

voidnext(){

index=++index>sf.length-1?0:index;

showPic();

}

publicvoidrun(){

while(true){

if(sf!=null&&sf.length>0&&autoFlag){

try{Thread.sleep(delay);}catch(Exceptione){}

next();

}

try{Thread.sleep(100);}catch(Exceptione){}

}

}

privatevoidstopB(){

autoFlag=false;

}

privatevoidstartB(){

autoFlag=true;

}

//显示图片

privatevoidshowPic(){

if(sf==null||sf.length==0)return;

pl.setIcon(newImageIcon(sf[index].getAbsolutePath()));

System.out.println(sf[index].getAbsolutePath());

}

}

『伍』 java怎么显示本地图片

在面板上搞一个和面板一样大的JLabel
然后，通过JFileChooser获得路径，利用这个图片的路径，构建一个ImageIcon
最后，根据这个ImageIcon去给JLabel对象setIcon(ImageIcon对象);

具体地：
1.panel.add(label,BorderLayout.CENTER);
2.ImageIcon icon = new ImageIcon(url);
3.label.setIcon(icon);

下面的代码你把 .JPG改成BMP试试看，O(∩_∩)O~
package com.shlq.sample;

import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

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

public class ImagePane extends JPanel
{
JLabel jl = null;
ImageIcon img = null;

public ImagePane()
{
img = new ImageIcon( "E:\\Picture\\1.jpg ");
jl = new JLabel(img);
this.setLayout(new BorderLayout());
this.add(jl, BorderLayout.CENTER);
}
public static void main(String[] args)
{
JFrame test = new JFrame( "Image Pane ");
test.getContentPane().add(new ImagePane());
test.pack();
test.setVisible(true);
test.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
}

『陆』 如何用java实现图片预览功能，求代码

使用两种不同的方法实现图片预览功能
Java代码
<BODY>
<script language="javascript">
function ShowImage(path){
document.all.divShow.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = path;
}
function test(){
document.all.showimg.src=document.all.file1.value;
}
</script>
<INPUT style="Z-INDEX: 101; LEFT: 232px; POSITION: absolute; TOP: 272px" type="file"onchange="ShowImage(this.value)">
<div id="divShow" style="FILTER:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image);WIDTH:274px;HEIGHT:100px">
<input type="file" id="file1" onchange="test()"><br/>
<img id="showimg" style="width:200px;height:200px;">
</BODY>

『柒』 Java获取本地图片，怎么在浏览器实现预览，注意是多张图片，通过io流的方式，，，具体实现求大神指教。

windows有自带视频播放 音频 播放 图片查看的、是一个空间、你上网络搜搜看、我忘了、很久没弄了、很简单的 传一个路劲就ok、路劲你就使用<input type="file" >获取