Android java.net.SocketTimeoutException: Connection timed ou

Question

>最近我在程序中遇到了以下错误：

11-18 12:30:30.259: W/System.err(21368): java.net.SocketTimeoutException: Connection timed out
11-18 12:30:30.259: W/System.err(21368):    at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)
11-18 12:30:30.259: W/System.err(21368):    at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357)
11-18 12:30:30.259: W/System.err(21368):    at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:204)
11-18 12:30:30.259: W/System.err(21368):    at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
11-18 12:30:30.259: W/System.err(21368):    at java.net.Socket.connect(Socket.java:1002)
11-18 12:30:30.259: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:75)
11-18 12:30:30.259: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
11-18 12:30:30.269: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
11-18 12:30:30.269: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
11-18 12:30:30.269: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
11-18 12:30:30.269: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
11-18 12:30:30.269: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:205)
11-18 12:30:30.269: W/System.err(21368):    at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:614)
11-18 12:30:30.269: W/System.err(21368):    at com.example.simplevider.SimpleVideo$4.run(SimpleVideo.java:122)
11-18 12:30:30.279: W/System.err(21368):    at java.lang.Thread.run(Thread.java:1019)

创建此错误的函数如下所示：

    private void sendStuff() {
    Log.e("sendStuff", "======================================");
    new Thread(new Runnable() {
        @Override
        public void run() {
            final int BUFFER_SIZE = 4096;
            try {
                File uploadFile = new File(existingFileName);
                System.out.println("File to upload: " + existingFileName);
                URL url = new URL(URL);
                HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
                httpConn.setUseCaches(false);
                httpConn.setDoOutput(true);
                httpConn.setRequestMethod("POST");
                httpConn.setReadTimeout(60*1000);
                httpConn.setConnectTimeout(60 * 1000);
                // sets file name as a HTTP header
                httpConn.setRequestProperty("fileName", uploadFile.getName());
                httpConn.setRequestProperty("extra-id", uploadFile.getAbsoluteFile().toString());
                httpConn.setRequestProperty("extra-id2", uploadFile.getParent());
                httpConn.setRequestProperty("extra-id3", uploadFile.length() + "");

                OutputStream outputStream = httpConn.getOutputStream(); //<< this is the source of the error

                FileInputStream inputStream = new FileInputStream(uploadFile);
                byte[] buffer = new byte[BUFFER_SIZE];
                int bytesRead = -1;
                System.out.println("Start writing data...");
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
                System.out.println("Data was written.");
                outputStream.close();
                inputStream.close();
                // always check HTTP response code from server
                int responseCode = httpConn.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    // reads server's response
                    BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream()));
                    String response = reader.readLine();
                    System.out.println("Server's response: " + response);
                } else {
                    System.out.println("Server returned non-OK code: " + responseCode);
                }
            } catch (Exception e) {
                e.printStackTrace();
                sendStuff();
            }
        }
    }).start();
}

这个函数在普通的 JAVA 中完美运行，但当复制到 Android 时，它会投java.net.SocketTimeoutException: Connection timed out，我不知道为什么。

Answer 1

有两种可能性，

1）您是否检查并测试了您的连接。

2）最好不要设置任何连接超时，如果你设置选择最长时间，因为它会抛出错误，如果服务器在给定的时间内没有响应。

Answer 2

您可以使用以下代码片段进行异常减半：

HttpURLConnection urlConnection = (HttpURLConnection) callUrl.openConnection();
urlConnection.setReadTimeout(30000);
urlConnection.setConnectTimeout(30000);

Answer 3

如果防火墙阻止 HTTP 或 HTTPS 服务，也会发生这种类型的异常并解锁该转到

防火墙->高级设置 -> 并检查 HTTP 或 HTTPS 选项并在此处保存输入映像说明