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import java.awt.BorderLayout;
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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循环里面加了个延时函数。
代码如下：import java.awt.Color; import java.awt.Toolkit; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JProgressBar; import javax.swing.JWindow; @SuppressWarnings("serial") public class Demo extends JWindow implements Runnable { // 定义加载窗口大小 public static final int LOAD_WIDTH = 455; public static final int LOAD_HEIGHT = 295; // 获取屏幕窗口大小 public static final int WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width; public static final int HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height; // 定义进度条组件 public JProgressBar progressbar; // 定义标签组件 public JLabel label; // 构造函数 public Demo() { // 创建标签,并在标签上放置一张图片 label = new JLabel(new ImageIcon("images/background.jpg")); label.setBounds(0, 0, LOAD_WIDTH, LOAD_HEIGHT - 15); // 创建进度条 progressbar = new JProgressBar(); // 显示当前进度值信息 progressbar.setStringPainted(true); // 设置进度条边框不显示 progressbar.setBorderPainted(false); // 设置进度条的前景色 progressbar.setForeground(new Color(0, 210, 40)); // 设置进度条的背景色 progressbar.setBackground(new Color(188, 190, 194)); progressbar.setBounds(0, LOAD_HEIGHT - 15, LOAD_WIDTH, 15); // 添加组件 this.add(label); this.add(progressbar); // 设置布局为空 this.setLayout(null); // 设置窗口初始位置 this.setLocation((WIDTH - LOAD_WIDTH) / 2, (HEIGHT - LOAD_HEIGHT) / 2); // 设置窗口大小 this.setSize(LOAD_WIDTH, LOAD_HEIGHT); // 设置窗口显示 this.setVisible(true); } public static void main(String[] args) { Demo t = new Demo(); new Thread(t).start(); } @Override public void run() { for (int i = 0; i 100; i++) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } progressbar.setValue(i); } JOptionPane.showMessageDialog(this, "加载完成"); this.dispose(); } } 效果图：
思路如下：
public class MyClass extends Thread {
public JProgressBar bar = new JProgressBar();//进度条
public OutputStream os;// 通向服务器的流
public InputStream is;// 你的文件流
public long len;// 你文件的总长度
public void run() {
byte[] buff = new byte[1024];
long passedlen = 0;
try {
int mark = 0;
while (true) {
mark = is.read(buff, 0, 1024);
os.write(buff, 0, mark);
// 更新进度
passedlen += mark;
int prog = (int) ((double) passedlen / (len == 0 ? 1 : len) * 100);
// 改变进度条的value值
bar.setValue(prog);
// 结束判定
if (passedlen == len) {
break;
}
}
os.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
这个好像做不到，现在一般有的效果就是上传文件时的进度条。
像你说得读取数据之类还没遇见过，一般也只是加个循环转动的图片等待而已，不能做到实时。
使用 apache fileupload ,spring MVC jquery1.6x , bootstrap 实现一个带进度条的多文件上传，由于fileupload 的局限，暂不能实现每个上传文件都显示进度条，只能实现一个总的进度条，效果如图：
1、jsp 页面
!DOCTYPE html
%@ page contentType="text/html;charset=UTF-8"%
%@ taglib prefix="c" uri="" %
html xmlns=""
head
meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /
script src="../js/jquery-1.6.4.js" type="text/javascript"/script
link rel="stylesheet" type="text/css" href="../css/bootstrap.css"/
/head
body
form id='fForm' class="form-actions form-horizontal" action="../upload.html"
encType="multipart/form-data" target="uploadf" method="post"
div class="control-group"
label class="control-label"上传文件:/label
div class="controls"
input type="file" name="file" style="width:550"
/div
div class="controls"
input type="file" name="file" style="width:550"
/div
div class="controls"
input type="file" name="file" style="width:550"
/div
label class="control-label"上传进度:/label
div class="controls"
div class="progress progress-success progress-striped" style="width:50%"
div id = 'proBar' class="bar" style="width: 0%"/div
/div
/div
/div
div class="control-group"
div class="controls"
button type="button" id="subbut" class="btn"submit/button
/div
/div
/form
iframe name="uploadf" style="display:none"/iframe
/body
/html
script
$(document).ready(function(){
$('#subbut').bind('click',
function(){
$('#fForm').submit();
var eventFun = function(){
$.ajax({
type: 'GET',
url: '../process.json',
data: {},
dataType: 'json',
success : function(data){
$('#proBar').css('width',data.rate+''+'%');
$('#proBar').empty();
$('#proBar').append(data.show);
if(data.rate == 100){
window.clearInterval(intId);
}
}});};
var intId = window.setInterval(eventFun,500);
});
});
/script
2、java 代码
package com.controller;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class FileUploadController {
Logger log = Logger.getLogger(FileUploadController.class);
/**
* upload 上传文件
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value = "/upload.html", method = RequestMethod.POST)
public ModelAndView upload(HttpServletRequest request,
HttpServletResponse response) throws Exception {
final HttpSession hs = request.getSession();
ModelAndView mv = new ModelAndView();
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if(!isMultipart){
return mv;
}
// Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setProgressListener(new ProgressListener(){
public void update(long pBytesRead, long pContentLength, int pItems) {
ProcessInfo pri = new ProcessInfo();
pri.itemNum = pItems;
pri.readSize = pBytesRead;
pri.totalSize = pContentLength;
pri.show = pBytesRead+"/"+pContentLength+" byte";
pri.rate = Math.round(new Float(pBytesRead) / new Float(pContentLength)*100);
hs.setAttribute("proInfo", pri);
}
});
List items = upload.parseRequest(request);
// Parse the request
// Process the uploaded items
// Iterator iter = items.iterator();
// while (iter.hasNext()) {
// FileItem item = (FileItem) iter.next();
// if (item.isFormField()) {
// String name = item.getFieldName();
// String value = item.getString();
// System.out.println("this is common feild!"+name+"="+value);
// } else {
// System.out.println("this is file feild!");
// String fieldName = item.getFieldName();
// String fileName = item.getName();
// String contentType = item.getContentType();
// boolean isInMemory = item.isInMemory();
// long sizeInBytes = item.getSize();
// File uploadedFile = new File("c://"+fileName);
// item.write(uploadedFile);
// }
// }
return mv;
}
/**
* process 获取进度
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value = "/process.json", method = RequestMethod.GET)
@ResponseBody
public Object process(HttpServletRequest request,
HttpServletResponse response) throws Exception {
return ( ProcessInfo)request.getSession().getAttribute("proInfo");
}
class ProcessInfo{
public long totalSize = 1;
public long readSize = 0;
public String show = "";
public int itemNum = 0;
public int rate = 0;
}
}
尝试设置JScrollPane js=new JScrollPane(ja); js在界面中的大小，试试。其实swing界面很简单，不显示要么没有添加，要么被遮盖了，要没有设置大小，要么没有设置布局位置。你细看看、找一个精度条的代码研究研究
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