java進度

『壹』 java實現進度條

先要明確你怎樣控制進度條，然後分步控制。就是如果讓你把進度條加到50%，你如何加。

『貳』 用 java 怎麼做進度條

用servlet吧，網上有很多！

『叄』 JAVA 進度條

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
public class Test extends JFrame {
public Test(){
super();
setSize(100,100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
JProgressBar progressBar = new JProgressBar();
getContentPane().add(progressBar,BorderLayout.NORTH);
progressBar.setStringPainted(true);
for (int i = 0;i < 50;i++){
progressBar.setValue(i);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
new Test();
}
}
for循環裡面加了個延時函數。

『肆』 java多文件上傳顯示進度條

使用 apache fileupload ,spring MVC jquery1.6x , bootstrap 實現一個帶進度條的多文件上傳，由於fileupload 的局限，暫不能實現每個上傳文件都顯示進度條，只能實現一個總的進度條，效果如圖：

packagecom.controller;

importjava.util.List;

importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjavax.servlet.http.HttpSession;

importorg.apache.commons.fileupload.FileItemFactory;
importorg.apache.commons.fileupload.ProgressListener;
importorg.apache.commons.fileupload.disk.DiskFileItemFactory;
importorg.apache.commons.fileupload.servlet.ServletFileUpload;
importorg.apache.log4j.Logger;
importorg.springframework.stereotype.Controller;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RequestMethod;
importorg.springframework.web.bind.annotation.ResponseBody;
importorg.springframework.web.servlet.ModelAndView;

@Controller
{
Loggerlog=Logger.getLogger(FileUploadController.class);

/**
*upload上傳文件
*@paramrequest
*@paramresponse
*@return
*@throwsException
*/
@RequestMapping(value="/upload.html",method=RequestMethod.POST)
publicModelAndViewupload(HttpServletRequestrequest,
HttpServletResponseresponse)throwsException{
finalHttpSessionhs=request.getSession();
ModelAndViewmv=newModelAndView();
booleanisMultipart=ServletFileUpload.isMultipartContent(request);
if(!isMultipart){
returnmv;
}
//Createafactoryfordisk-basedfileitems
FileItemFactoryfactory=newDiskFileItemFactory();

//Createanewfileuploadhandler
ServletFileUploapload=newServletFileUpload(factory);
upload.setProgressListener(newProgressListener(){
publicvoipdate(longpBytesRead,longpContentLength,intpItems){
ProcessInfopri=newProcessInfo();
pri.itemNum=pItems;
pri.readSize=pBytesRead;
pri.totalSize=pContentLength;
pri.show=pBytesRead+"/"+pContentLength+"byte";
pri.rate=Math.round(newFloat(pBytesRead)/newFloat(pContentLength)*100);
hs.setAttribute("proInfo",pri);
}
});
Listitems=upload.parseRequest(request);
//Parsetherequest
//Processtheuploadeditems
//Iteratoriter=items.iterator();
//while(iter.hasNext()){
//FileItemitem=(FileItem)iter.next();
//if(item.isFormField()){
//Stringname=item.getFieldName();
//Stringvalue=item.getString();
//System.out.println("thisiscommonfeild!"+name+"="+value);
//}else{
//System.out.println("thisisfilefeild!");
//StringfieldName=item.getFieldName();
//StringfileName=item.getName();
//StringcontentType=item.getContentType();
//booleanisInMemory=item.isInMemory();
//longsizeInBytes=item.getSize();
//FileuploadedFile=newFile("c://"+fileName);
//item.write(uploadedFile);
//}
//}
returnmv;
}


/**
*process獲取進度
*@paramrequest
*@paramresponse
*@return
*@throwsException
*/
@RequestMapping(value="/process.json",method=RequestMethod.GET)
@ResponseBody
publicObjectprocess(HttpServletRequestrequest,
HttpServletResponseresponse)throwsException{
return(ProcessInfo)request.getSession().getAttribute("proInfo");
}

classProcessInfo{
publiclongtotalSize=1;
publiclongreadSize=0;
publicStringshow="";
publicintitemNum=0;
publicintrate=0;
}

}

『伍』 關於Java中進度條的問題

importjava.awt.BorderLayout;
importjava.awt.Cursor;
importjava.awt.Toolkit;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.beans.PropertyChangeEvent;
importjava.beans.PropertyChangeListener;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.InputStream;
importjava.io.OutputStream;

importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JProgressBar;
importjavax.swing.SwingWorker;


{
	=1L;

	;

	privateJButton;

	privateTasktask;

	publicBar(Stringtitle)
	{
		setTitle(title);
		setLayout(newBorderLayout());
		progressBar=newJProgressBar(0,100);
		progressBar.setValue(0);
		progressBar.setStringPainted(true);

		add(progressBar,BorderLayout.CENTER);
		=newJButton("拷貝");
		.addActionListener(newActionListener()
		{
			@Override
			publicvoidactionPerformed(ActionEvente)
			{
				start();
				.setEnabled(false);
			}
		});
		add(,BorderLayout.EAST);
	}

	classTaskextendsSwingWorker<Void,Void>
	{
		@Override
		publicVoiddoInBackground()
		{
			setProgress(0);
			Filefile=newFile("aa.mp3");
			longsize=file.length();
			byte[]bts=newbyte[1024*10];
			intlength=0;
			longcLength=0;
			try
			{
				InputStreamstream=newFileInputStream(file);
				OutputStreamos=newFileOutputStream(newFile("a.mp3"));
				while((length=stream.read(bts))>0)
				{
					os.write(bts,0,length);
					cLength+=length;
					setProgress((int)(cLength*100/size));
					Thread.sleep(100);
				}
				os.close();
				stream.close();
			}
			catch(Exceptione1)
			{
				e1.printStackTrace();
			}
			returnnull;
		}

		@Override
		publicvoiddone()
		{
			setTitle("拷貝完畢");
			Toolkit.getDefaultToolkit().beep();
			.setEnabled(true);
			setCursor(null);
		}
	}

	publicvoidpropertyChange(PropertyChangeEventevt)
	{
		if("progress"==evt.getPropertyName())
		{
			intprogress=(Integer)evt.getNewValue();
			progressBar.setValue(progress);
		}
	}

	privatevoidstart()
	{
		task=newTask();
		task.addPropertyChangeListener(this);
		task.execute();
		setTitle("正在拷貝...");
		setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
	}

	()
	{
		Barframe=newBar("Bar");
		frame.setAlwaysOnTop(true);
		frame.setSize(280,60);
		frame.setResizable(false);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	publicstaticvoidmain(String[]args)
	{
		javax.swing.SwingUtilities.invokeLater(newRunnable()
		{
			publicvoidrun()
			{
				createAndShowGUI();
			}
		});
	}
}

publicstaticvoidmain(String[]args){
		intnum=20;
		for(inti=0;i<=num;i++){
			System.out.println("當前進度:"+i*100/num+"%"+i+"/"+num);
		}
	}