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xx0326：
谢谢。楼主。哦。
js 检测身份证 -
triny1984：
。。。楼主也应该搞点文档说明一下吧。一个代码让人看起来有点纳闷 ...
flex、java聊天室 -
yexin218：
代码要格式化下，用编辑器里面代码工具<pre name= ...
javaAwt 实现照片浏览（初学者） -
343101272：
很好很强大
正则表达式提取html中的内容 -
javacto：
javacto 写道
呵呵 学长好& ...
java正则实例大全
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FilenameFilter;
import javax.imageio.ImageIO;
public class PictureViewer implements ActionListener{
private Frame frame;
private MyCanvas mc;
private String fpath;
private String fname;
private File[] files;
private int findex;
private FileDialog fd_load;
private MyFilter filter;
private Button previous;
private Button next;
public static void main(String[] args) {
new PictureViewer().init();
}
public void init(){
frame=new Frame("pictureViewer");
Panel pb=new Panel();
Button select=new Button("选择图片");
previous=new Button("上一张");
next=new Button("下一张");
select.addActionListener(this);
previous.addActionListener(this);
next.addActionListener(this);
pb.add(select);
pb.add(previous);
pb.add(next);
mc=new MyCanvas();
mc.setBackground(new Color(200,210,230));
mc.addComponentListener(mc);
frame.add(pb,BorderLayout.NORTH);
frame.add(mc,BorderLayout.CENTER);
frame.setSize(360,360);
frame.setLocation(400,200);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
frame.setVisible(true);
this.validateButton();
filter=new MyFilter();
fd_load=new FileDialog(frame,"打开文件",FileDialog.LOAD);
fd_load.setFilenameFilter(filter);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String commond=e.getActionCommand();
if(commond.equals("选择图片")){
fd_load.setVisible(true);
fpath=fd_load.getDirectory();
fname=fd_load.getFile();
if(fpath!=null&&fname!=null){
this.display(new File(fpath+fname));
files=new File(fpath).listFiles(filter);
this.setIndex();
}
}else if(commond.equals("上一张")){
findex--;
if(findex<0)
findex=0;
this.display(files[findex]);
}else if(commond.equals("下一张")){
findex++;
if(findex>=files.length)
findex=files.length-1;
this.display(files[findex]);
}
this.validateButton();
}
public void display(File f){
try{
BufferedImage bi=ImageIO.read(f);
mc.setImage(bi);
frame.setTitle("pictureViewer-["+f.getName()+"]");
}catch(Exception e){
e.printStackTrace();
}
mc.repaint();
}
public void setIndex(){
File current=new File(fpath+fname);
if(files!=null){
for(int i=0;i<files.length;i++){
if(current.equals(files[i])){
findex=i;
}
}
}
}
public void validateButton(){
previous.setEnabled((files!=null&&findex>0));
next.setEnabled((files!=null&&(findex<(files.length-1))));
}
}
class MyCanvas extends Canvas implements ComponentListener{
private BufferedImage bi;
private Image im;
private int image_width;
private int image_height;
public void setImage(BufferedImage bi){
this.bi = bi;
this.zoom();
}
public void paint(Graphics g){
g.drawImage(im,(this.getWidth()-image_width)/2,(this.getHeight()-image_height)/2,this);
}
public void componentResized(ComponentEvent e){
if(bi != null){
this.zoom();
this.repaint();
}
}
public void componentMoved(ComponentEvent e){}
public void componentShown(ComponentEvent e){}
public void componentHidden(ComponentEvent e){}
public void zoom(){
if(bi == null)
return;
int screen_width = this.getWidth();
int screen_height = this.getHeight();
double screen_proportion = 1.0 * screen_height / screen_width;
image_width = bi.getWidth(this);
image_height = bi.getHeight(this);
double image_proportion = 1.0 * image_height / image_width;
if(image_proportion > screen_proportion){
image_height = screen_height;
image_width = (int)(image_height / image_proportion);
}else{
image_width = screen_width;
image_height = (int)(image_width * image_proportion);
}
im = bi.getScaledInstance(image_width,image_height,Image.SCALE_SMOOTH);
}
}
class MyFilter implements FilenameFilter{
private String[] extension;
public MyFilter(){
extension = new String[]{".jpg", ".JPG", ".gif", ".GIF", ".png", ".PNG", ".jpeg", ".JPEG"};
}
public MyFilter(String[] extension){
this.extension = extension;
}
public boolean accept(File dir,String name){
for(String s : extension){
if(name.endsWith(s)){
return true;
}
}
return false;
}
}
评论
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FilenameFilter;
import javax.imageio.ImageIO;
public class PictureViewer implements ActionListener{
private Frame frame;
private MyCanvas mc;
private String fpath;
private String fname;
private File[] files;
private int findex;
private FileDialog fd_load;
private MyFilter filter;
private Button previous;
private Button next;
public static void main(String[] args) {
new PictureViewer().init();
}
public void init(){
frame=new Frame("pictureViewer");
Panel pb=new Panel();
Button select=new Button("选择图片");
previous=new Button("上一张");
next=new Button("下一张");
select.addActionListener(this);
previous.addActionListener(this);
next.addActionListener(this);
pb.add(select);
pb.add(previous);
pb.add(next);
mc=new MyCanvas();
mc.setBackground(new Color(200,210,230));
mc.addComponentListener(mc);
frame.add(pb,BorderLayout.NORTH);
frame.add(mc,BorderLayout.CENTER);
frame.setSize(360,360);
frame.setLocation(400,200);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
frame.setVisible(true);
this.validateButton();
filter=new MyFilter();
fd_load=new FileDialog(frame,"打开文件",FileDialog.LOAD);
fd_load.setFilenameFilter(filter);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
String commond=e.getActionCommand();
if(commond.equals(" 选择图片")){
fd_load.setVisible(true);
fpath=fd_load.getDirectory();
fname=fd_load.getFile();
if(fpath!=null&&fname!=null){
this.display(new File(fpath+fname));
files=new File(fpath).listFiles(filter);
this.setIndex();
}
}else if(commond.equals("上一张")){
findex--;
if(findex<0)
findex=0;
this.display(files[findex]);
}else if(commond.equals("下一张")){
findex++;
if(findex>=files.length)
findex=files.length-1;
this.display(files[findex]);
}
this.validateButton();
}
public void display(File f){
try{
BufferedImage bi=ImageIO.read(f);
mc.setImage(bi);
frame.setTitle("pictureViewer-["+f.getName()+"]");
}catch(Exception e){
e.printStackTrace();
}
mc.repaint();
}
public void setIndex(){
File current=new File(fpath+fname);
if(files!=null){
for(int i=0;i<files.length;i++){
if(current.equals(files[i])){
findex=i;
}
}
}
}
public void validateButton(){
previous.setEnabled((files!=null&&findex>0));
next.setEnabled((files!=null&&(findex<(files.length-1))));
}
}
class MyCanvas extends Canvas implements ComponentListener{
private BufferedImage bi;
private Image im;
private int image_width;
private int image_height;
public void setImage(BufferedImage bi){
this.bi = bi;
this.zoom();
}
public void paint(Graphics g){
g.drawImage(im,(this.getWidth()-image_width)/2,(this.getHeight()-image_height)/2,this);
}
public void componentResized(ComponentEvent e){
if(bi != null){
this.zoom();
this.repaint();
}
}
public void componentMoved(ComponentEvent e){}
public void componentShown(ComponentEvent e){}
public void componentHidden(ComponentEvent e){}
public void zoom(){
if(bi == null)
return;
int screen_width = this.getWidth();
int screen_height = this.getHeight();
double screen_proportion = 1.0 * screen_height / screen_width;
image_width = bi.getWidth(this);
image_height = bi.getHeight(this);
double image_proportion = 1.0 * image_height / image_width;
if(image_proportion > screen_proportion){
image_height = screen_height;
image_width = (int)(image_height / image_proportion);
}else{
image_width = screen_width;
image_height = (int)(image_width * image_proportion);
}
im = bi.getScaledInstance(image_width,image_height,Image.SCALE_SMOOTH);
}
}
class MyFilter implements FilenameFilter{
private String[] extension;
public MyFilter(){
extension = new String[]{".jpg", ".JPG", ".gif", ".GIF", ".png", ".PNG", ".jpeg", ".JPEG"};
}
public MyFilter(String[] extension){
this.extension = extension;
}
public boolean accept(File dir,String name){
for(String s : extension){
if(name.endsWith(s)){
return true;
}
}
return false;
}
}发表评论
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