Question

我有以下代码片段，可将zip文件从互联网下载到我的SD卡。它以原始大小下载文件。但我无法提取文件，因为它显示“文件已损坏”错误。它发生在所有网址上。

URL url;
URLConnection conn;
int fileSize;
InputStream inStream;
String outFile;
String fileName = "";
OutputStream outStream;
Message msg;
msg = Message.obtain(mhandler, DOWNLOAD_STARTED, 0, 0, downloadUrl);
mhandler.sendMessage(msg);
try {
    url = new URL(downloadUrl);
    conn = url.openConnection();
    if(url.getProtocol().equals("https")){
        conn = (HttpsURLConnection) conn;

    }
    conn.addRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
    conn.addRequestProperty("Accept-Encoding", "gzip, deflate, sdch");
    fileSize = conn.getContentLength();
    int fileSizeKB = fileSize / 1024;
    msg = Message.obtain(mhandler, DOWNLOAD_STARTED, fileSizeKB, 0,
            fileName);
    mhandler.sendMessage(msg);
    inStream = conn.getInputStream();
    outFile = Environment.getDataDirectory().getPath()+"/windows/Documents/file.zip";
    outStream = new FileOutputStream(outFile);
    byte[] data = new byte[1024];
    int bytesRead = 0;
    while (!isInterrupted()
            && (bytesRead = inStream.read(data)) != -1) {
        outStream.write(data, 0, bytesRead);
    }
    outStream.flush();
    outStream.close();
    inStream.close();
    if (isInterrupted()) {
        new File(outFile).delete();
    } else {
        msg = Message.obtain(mhandler, DOWNLOAD_COMPLETED);
        mhandler.sendMessage(msg);
    }
} catch (Exception exp) {
    msg = Message.obtain(mhandler, DOWNLOAD_FAILED);
    mhandler.sendMessage(msg);
}

你能告诉我我在做什么错吗？

Answer 1

尝试使用此代码下载文件：

res.setHeader('Access-Control-Allow-Origin', '*');

Answer 2

int mFileSize = 0;
String path = "/sdcard/path";
final int BUFFER_SIZE = 1024;
BufferedInputStream bis;
RandomAccessFile fos;
byte[] buf = new byte[BUFFER_SIZE];
int curPosition = 0;
File destFile = new File(path + File.separator + "fileName");
if(destFile.exists()) {
    destFile.delete();
}
try {
    URL url = new URL("http://xxx.xxx");
    URLConnection conn = url.openConnection();
    conn.setAllowUserInteraction(true);
    mFileSize = conn.getContentLength();
    if(mFileSize <= 0) {
        if(destFile.exists()) {
            destFile.delete();
        }
        return;
    }           
    fos = new RandomAccessFile(destFile, "rw");
    bis = new BufferedInputStream(conn.getInputStream());            
    while(curPosition < mFileSize) {               
        int len = bis.read(buf, 0, BUFFER_SIZE);
        if (len == -1) {
            break;
        }
        fos.write(buf, 0, len);
        curPosition += len;
    }
    bis.close();
    fos.close();
} catch (Exception e) {
    e.printStackTrace();
    if(destFile.exists()) {
        destFile.delete();
    }
}

在android下载zip文件

2 个答案: