在java中恢复http文件下载
在java中恢复http文件下载
提问于 2011-06-04 21:45:22
URL url = new URL("http://download.thinkbroadband.com/20MB.zip");
URLConnection connection = url.openConnection();
File fileThatExists = new File(path);
OutputStream output = new FileOutputStream(path, true);
connection.setRequestProperty("Range", "bytes=" + fileThatExists.length() + "-");
connection.connect();
int lenghtOfFile = connection.getContentLength();
InputStream input = new BufferedInputStream(url.openStream());
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
output.write(data, 0 , count);
}在这段代码中，我尝试恢复下载。目标文件大小为20MB。但是当我在10mb上停止下载，然后继续下载，我得到文件大小为30MB的文件。它似乎继续写入文件，但不能从服务器下载部分。Wget -c可以很好地处理这个文件。如何恢复文件下载？
Stack Overflow用户
回答已采纳
发布于 2011-06-13 00:21:44
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);
}这不是我的代码，但它可以工作。
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原文链接：
https://stackoverflow.com/questions/6237079
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