以下是我从安装服务器下载文件的android代码。
private String executeMultipart_download(String uri, String filepath)
throws SocketTimeoutException, IOException {
int count;
System.setProperty("http.keepAlive", "false");
// uri="https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcTzoeDGx78aM1InBnPLNb1209jyc2Ck0cRG9x113SalI9FsPiMXyrts4fdU";
URL url = new URL(uri);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
int lenghtOfFile = connection.getContentLength();
Log.d("File Download", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(filepath);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
httpStatus = connection.getResponseCode();
String statusMessage = connection.getResponseMessage();
connection.disconnect();
return statusMessage;
}
我已调试此代码。即使它击中服务器两次,该函数也只被调用一次。 他们在这段代码中有任何错误。
谢谢
答案 0 :(得分:8)
您的错误在于此行:
url.openStream()
如果我们将grepcode转到此函数的来源,那么我们将看到:
public final InputStream openStream() throws java.io.IOException {
return openConnection().getInputStream();
}
但是你已经打开了连接,所以你打开连接两次。
作为解决方案,您需要将url.openStream()
替换为connection.getInputStream()
因此你的剪辑看起来像:
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
int lenghtOfFile = connection.getContentLength();
Log.d("File Download", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(connection.getInputStream());