恢复下载不工作的机器人 [英] Resume Download not working in android

问题描述

这$ C $下恢复下载不正常的机器人，但它工作正常，在Java应用程序。在这里，我想下载一个ZIP文件，它会继续下载，但最终结果是无效的zip文件。

 的BufferedInputStream在= NULL;
        FileOutputStream中FOS = NULL;
        的BufferedOutputStream回合= NULL;

        尝试 {
            下载= 0;
            HttpURLConnection的连接=（HttpURLConnection类）url.openConnection（）;
            如果（ISSUE_DOWNLOAD_STATUS.intValue（）== ECMConstant.ECM_DOWNLOADING）{
                档案文件=新的文件（destination_path可）;
                如果（file.exists（））{
                    下载=（int）的file.length（）;
                }
            }
            connection.setRequestProperty（范围，字节=+下载+ - ）;
            connection.connect（）;
            大小= connection.getContentLength（）;
            Dialog.setMax（大小）;
             在=新的BufferedInputStream（connection.getInputStream（））;
             FOS =（下载== 0）？新的FileOutputStream（destination_path可）：新的FileOutputStream（destination_path可，真正的）;
             布特=新的BufferedOutputStream（FOS，1024）;
            byte []的数据=新的字节[1024];
            INT X = 0;
            而（（X = in.read（数据，0，1024））＆GT; = 0）{
                bout.write（数据，0，x）的;
                 下载+ = X;
                 的System.out.println（下载）;
                 onProgressUpdate（（INT）（下载* 100 /大小））;
            }

            更迭=真;
        }赶上（例外五）{
            e.printStackTrace（）;
        } 最后 {
            尝试 {
                附寄（）;
                bout.close（）;
            }赶上（IOException异常E）{
                e.printStackTrace（）;
            }

        }
 

感谢。

解决方案

  HttpURLConnection的连接=（HttpURLConnection类）url.openConnection（）;
        如果（ISSUE_DOWNLOAD_STATUS.intValue（）== ECMConstant.ECM_DOWNLOADING）{
            档案文件=新的文件（destination_path可）;
            如果（file.exists（））{
                 下载=（int）的file.length（）;
                 connection.setRequestProperty（范围，字节=+（file.length（））+ - ）;
            }
        }其他{
            connection.setRequestProperty（范围，字节=+下载+ - ）;
        }
        connection.setDoInput（真正的）;
        connection.setDoOutput（真正的）;
        progressBar.setMax（connection.getContentLength（））;
         在=新的BufferedInputStream（connection.getInputStream（））;
         FOS =（下载== 0）？新的FileOutputStream（destination_path可）：新的FileOutputStream（destination_path可，真正的）;
         布特=新的BufferedOutputStream（FOS，1024）;
        byte []的数据=新的字节[1024];
        INT X = 0;
        而（（X = in.read（数据，0，1024））＆GT; = 0）{
            bout.write（数据，0，x）的;
             下载+ = X;
             progressBar.setProgress（下载）;
        }
 

This code for resuming download is not working properly in Android, although it works fine in a Java application. Here I am trying to download a zip file, and it will resume the download, but the net result is an invalid zip file.

 BufferedInputStream in = null;
        FileOutputStream fos = null;
        BufferedOutputStream bout=null;

        try {
            downloaded=0;
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            if(ISSUE_DOWNLOAD_STATUS.intValue()==ECMConstant.ECM_DOWNLOADING){
                File file=new File(DESTINATION_PATH);
                if(file.exists()){
                    downloaded = (int) file.length();
                }
            }
            connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
            connection.connect();
            size=connection.getContentLength();
            Dialog.setMax(size);
             in = new BufferedInputStream(connection.getInputStream());
             fos=(downloaded==0)? new FileOutputStream(DESTINATION_PATH): new FileOutputStream(DESTINATION_PATH,true);
             bout = new BufferedOutputStream(fos, 1024);
            byte[] data = new byte[1024];
            int x = 0;
            while ((x = in.read(data, 0, 1024)) >= 0) {
                bout.write(data, 0, x);
                 downloaded += x;
                 System.out.println(downloaded);
                 onProgressUpdate((int)(downloaded*100/size));
            }

            succes=true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
                bout.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

Thanks.

解决方案

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        if(ISSUE_DOWNLOAD_STATUS.intValue()==ECMConstant.ECM_DOWNLOADING){
            File file=new File(DESTINATION_PATH);
            if(file.exists()){
                 downloaded = (int) file.length();
                 connection.setRequestProperty("Range", "bytes="+(file.length())+"-");
            }
        }else{
            connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
        }
        connection.setDoInput(true);
        connection.setDoOutput(true);
        progressBar.setMax(connection.getContentLength());
         in = new BufferedInputStream(connection.getInputStream());
         fos=(downloaded==0)? new FileOutputStream(DESTINATION_PATH): new FileOutputStream(DESTINATION_PATH,true);
         bout = new BufferedOutputStream(fos, 1024);
        byte[] data = new byte[1024];
        int x = 0;
        while ((x = in.read(data, 0, 1024)) >= 0) {
            bout.write(data, 0, x);
             downloaded += x;
             progressBar.setProgress(downloaded);
        }

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