Java中如何實現(xiàn)進度條效果

代碼如下：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 { // 定義加載窗口大小 public static final int LOAD_WIDTH = 455; public static final int LOAD_HEIGHT = 295; // 獲取屏幕窗口大小 public static final int WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width; public static final int HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height; // 定義進度條組件 public JProgressBar progressbar; // 定義標(biāo)簽組件 public JLabel label; // 構(gòu)造函數(shù) public Demo() { // 創(chuàng)建標(biāo)簽,并在標(biāo)簽上放置一張圖片 label = new JLabel(new ImageIcon("images/background.jpg")); label.setBounds(0, 0, LOAD_WIDTH, LOAD_HEIGHT - 15); // 創(chuàng)建進度條 progressbar = new JProgressBar(); // 顯示當(dāng)前進度值信息 progressbar.setStringPainted(true); // 設(shè)置進度條邊框不顯示 progressbar.setBorderPainted(false); // 設(shè)置進度條的前景色 progressbar.setForeground(new Color(0, 210, 40)); // 設(shè)置進度條的背景色 progressbar.setBackground(new Color(188, 190, 194)); progressbar.setBounds(0, LOAD_HEIGHT - 15, LOAD_WIDTH, 15); // 添加組件 this.add(label); this.add(progressbar); // 設(shè)置布局為空 this.setLayout(null); // 設(shè)置窗口初始位置 this.setLocation((WIDTH - LOAD_WIDTH) / 2, (HEIGHT - LOAD_HEIGHT) / 2); // 設(shè)置窗口大小 this.setSize(LOAD_WIDTH, LOAD_HEIGHT); // 設(shè)置窗口顯示 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, "加載完成"); this.dispose(); } } 效果圖：

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java 做進度條 進度數(shù)據(jù)獲取

實現(xiàn)這個功能比較簡單，用到的類有兩個：ProgressMonitorInputStream（主要是整個類） 和 ProgressMonitor ，在javax.swing中整個文件的大小，和當(dāng)前已經(jīng)讀取文件的大小，獲得整個文件大小的方法

代碼如下:

ProgressMonitorInputStream monitor;

/**

* @param 表示此進度條要依附在哪個組件上

* @param 顯示在此進度條上的消息

* @param 需要監(jiān)控的輸入流

*/

monitor = new ProgressMonitorInputStream(null, "Loading ",new FileInputStream("filename path"));

int all = monitor.available();//整個文件的大小

int in = monitor.read(data);//每次讀取文件的大小

例如：你每次讀一行str=in.readLine();則data=str.instr.getBytes()+1;這里+1，主要是為了獲得換行符的字節(jié)數(shù)，否則，最后獲得的進步無法達(dá)到100%

代碼如下:

int readed=0;//表示已經(jīng)讀取的文件

reader+=in;//累加讀取文件大小

計算進度：

代碼如下:

float process = (float) readed / all * 100;// 算出百分比

窗口顯示：

代碼如下:

progressMonitor.setNote("archived " + process + " %");// 顯示在進度條上

java多文件上傳顯示進度條

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

1、jsp 頁面

!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"上傳文件:/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"上傳進度:/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 代碼

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??上傳文件?

*?@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?獲取進度?

*?@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;??

}??

}

java導(dǎo)入進度條

很簡單，因為數(shù)據(jù)讀到集合所用的時間遠(yuǎn)遠(yuǎn)不如數(shù)據(jù)庫的存儲，因此只要計算插入數(shù)據(jù)庫的進度即可。做法是：在讀入數(shù)據(jù)庫的時候 根據(jù)集合的大小生成一個最大進度為集合長度的進度條，每成功寫入數(shù)據(jù)庫一條，進度條 +1。

當(dāng)前標(biāo)題：java進度條代碼大全 進度條代碼怎么寫
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