尝试使用具有暂停/恢复功能的“输入/输出流”进行下载。 问题是当我将requestproperty设置为我下载的数量时:connection.setRequestProperty(“Range”，“bytes =”+downloaded+“-”); 并读取长度:int fileLength = connection.getContentLength(); 它给了我正确的数量，但在下载代码(while 循环)中，即使我设置了正确的请求，它也会下载文件的完整大小。
示例: 它开始正常下载
total:2048 data length:1570024
07-21 11:26:17.650 D: zz path:v_3_1 total:4096 file length(should be full):1570024
07-21 11:26:17.650 D: zz path:v_3_1 total:6144 file length(should be full):1570024
07-21 11:26:17.651 D: zz path:v_3_1 total:8192 file length(should be full):1570024
07-21 11:26:17.652 D: zz path:v_3_1 total:10240 file length(should be full):1570024
07-21 11:26:17.652 D: zz path:v_3_1 total:12288 file length(should be full):1570024
07-21 11:26:17.653 D: zz path:v_3_1 total:14336 file length(should be full):1570024
07-21 11:26:17.653 D: zz path:v_3_1 total:16384 file length(should be full):1570024
在这里我暂停然后恢复它(工作正常):
data length is:830696
07-21 11:26:30.949 D: zz path:v_3_1 total:741376 file length(should be full):1570024
07-21 11:26:30.950 D: zz path:v_3_1 total:743424 file length(should be full):1570024
07-21 11:26:30.950 D: zz path:v_3_1 total:745472 file length(should be full):1570024
07-21 11:26:30.950 D: zz path:v_3_1 total:747520 file length(should be full):1570024
07-21 11:26:30.950 D: zz path:v_3_1 total:749568 file length(should be full):1570024
07-21 11:26:30.950 D: zz path:v_3_1 total:751616 file length(should be full):1570024
07-21 11:26:30.951 D: zz path:v_3_1 total:753664 file length(should be full):1570024
07-21 11:26:30.951 D: zz path:v_3_1 total:755712 file length(should be full):1570024
07-21 11:26:31.070 D: zz path:v_3_1 total:757760 file length(should be full):1570024
07-21 11:26:31.071 D: zz path:v_3_1 total:759808 file length(should be full):1570024
07-21 11:26:31.074 D: zz path:v_3_1 total:761856 file length(should be full):1570024
07-21 11:26:31.076 D: zz path:v_3_1 total:763904 file length(should be full):1570024
07-21 11:26:31.077 D: zz path:v_3_1 total:765952 file length(should be full):1570024
07-21 11:26:31.078 D: zz path:v_3_1 total:768000 file length(should be full):1570024
但随后它会超过文件的完整大小并停止在 1570024(完整大小)+739328(我暂停之前的大小)...它应该只会上升到 1570024 并停止。
07-21 11:26:32.125 D: zz path:v_3_1 total:1750816 file length(should be full):1570024
代码:
try {
URL url = new URL(sUrl[1]);
URLConnection connection = url.openConnection();
if(resume){downloaded=viv.getIsdown2(path);
connection.setRequestProperty("Range", "bytes=" + downloaded + "-");}
connection.setDoInput(true);
connection.setDoOutput(true);
connection.connect();
int fileLength = connection.getContentLength();
Log.d("dt", "zz "+path+" data length is:" + fileLength);
fos = new FileOutputStream(outfile);
fis = new FileInputStream(outfile);
encipher = Cipher.getInstance("AES");
encipher.init(Cipher.ENCRYPT_MODE, secretKey);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(outfile);
cis = new CipherInputStream(fis, encipher);
byte data[] = new byte[8 * 1024];
total = downloaded;
// total = 0;
fileLength+=downloaded;
int count;
while ((count = input.read(data)) !=-1) {
total += count;
progpercent = (int) (total * 100 / fileLength);
publishProgress(progpercent, total); Log.d("dt", "zz path:"+path+" total:" + total+" file length(should be full):" + fileLength);
output.write(data, 0, count);
if(isCancelled())break;
}
output.flush();
output.close();
input.close();
更新:既然我弄清楚了我的主要问题的答案是什么，另一个问题是，即使在 fileoutputStream 中使用append=true，写入的文件也会覆盖当前的文件，我不知道为什么......有什么建议吗？
最佳答案
在暂停下载之前跟踪已下载的大小，并在恢复功能中，您可以确保从总量中减去暂停之前已下载的量，以获得剩余下载量。
connection.setRequestProperty("Range", "bytes=" + (total - downloaded) + "-");}
关于java - SetRequestProperty 有效，但下载完整大小，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57132872/