發送POST請求並讀取響應。 conException.getInputStream（）時出現IOException

Question

我到處搜索，無法解決我的問題。 我有AsyncTask，在doInBackground中，我有：

 protected Void doInBackground(byte[]... params) {
 try {
    URL url = new URL(stringURL);
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    // Allow Inputs
    conn.setDoInput(true);
    // Allow Outputs
    conn.setDoOutput(true);
    // Don't use a cached copy.
    onn.setUseCaches(false);
    // Use a post method.
    conn.setRequestMethod("POST");
    conn.setRequestProperty("Content-Type", "text/html; charset=UTF-8");
    conn.setRequestProperty("Connection", "Keep-Alive");
    conn.setRequestProperty("Accept", "text/html");
    conn.setRequestProperty("Content-Length", params[0].length);

    OutputStream out = conn.getOutputStream();
    out.write(params[0]);
    out.flush();
    out.close();

    InputStream is = conn.getInputStream();
    int ch;
    StringBuffer b =new StringBuffer();
    while( ( ch = is.read() ) != -1 ){
       b.append( (char)ch );
    }
    String s = b.toString();

}catch (IOException e) {
    e.printStackTrace();
}

我這樣稱呼我的異步任務： new httpRequestResponseTask().execute(byteArray);

每當我成功發送請求時，嘗試讀取響應后，都會得到java.io.IOException: unexpected end of stream on Connection...當我調用conn.getInputStream()時java.io.IOException: unexpected end of stream on Connection... conn.getInputStream() java.io.IOException: unexpected end of stream on Connection... 。 當我調用conn.getResponseCode()和conn.getResponseMessage()時，會遇到相同的異常。

我可以看到服務器收到了我的請求並成功發送了響應 。 但是我不明白。

我嘗試了許多想法（其中有些瘋狂）只是為了測試：

*我把conn.connect(); 設置屬性后-相同的IOexception

*不關閉OutputStream-相同的IOexception

*增加像

     conn.setReadTimeout(30000);
     conn.setConnectTimeout(35000);

響應應該是57個字節，所以超時就足夠了。 沒變。

*我嘗試使用url.OpenStream（）獲取InputStream。 它只是掛了，什么也沒發生。

*我嘗試使用其他屬性（如Accept-Encoding和較少的Properties。

*我檢查了網址，其中沒有空格。 網址是這樣的： http://example.com:8080 : http://example.com:8080 : http://example.com:8080 。

我沒有代理人。 我將個人電話用作Wi-Fi熱點，並使用工作電話測試該程序。 與android 6.0一起使用，但項目設置為4.4 kitkat。

我應該以某種方式等待還是做其他事情？ 我沒主意...

更新例外堆棧

沒有內容長度

12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err: java.io.IOException: unexpected end of stream on Connection{example.com:8080, proxy=DIRECT@ hostAddress=*.*.*.* cipherSuite=none protocol=http/1.1} (recycle count=0)
12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:210)
12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:80)
12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:918)
12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:802)
12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:460)
12-21 14:38:09.516 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:405)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at com.xmltestservers.MainActivity$RetrieveFeedTask.doInBackground(MainActivity.java:172)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at com.xmltestservers.MainActivity$RetrieveFeedTask.doInBackground(MainActivity.java:125)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at java.lang.Thread.run(Thread.java:818)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err: Caused by: java.io.EOFException: \n not found: size=0 content=...
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:200)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:191)
12-21 14:38:09.517 5481-5572/com.xmltestservers W/System.err:   ... 14 more

具有內容長度

12-21 14:40:42.783 7729-7837/com.xmltestservers W/System.err: java.io.IOException: unexpected end of stream on Connection{example.com:8080, proxy=DIRECT@ hostAddress=*.*.*.* cipherSuite=none protocol=http/1.1} (recycle count=0)
12-21 14:40:42.784 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:210)
12-21 14:40:42.785 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:80)
12-21 14:40:42.785 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:918)
12-21 14:40:42.785 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:802)
12-21 14:40:42.786 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:460)
12-21 14:40:42.786 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:405)
12-21 14:40:42.786 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:231)
12-21 14:40:42.786 7729-7837/com.xmltestservers W/System.err:     at com.xmltestservers.MainActivity$RetrieveFeedTask.doInBackground(MainActivity.java:169)
12-21 14:40:42.786 7729-7837/com.xmltestservers W/System.err:     at com.xmltestservers.MainActivity$RetrieveFeedTask.doInBackground(MainActivity.java:125)
12-21 14:40:42.787 7729-7837/com.xmltestservers W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
12-21 14:40:42.787 7729-7837/com.xmltestservers W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-21 14:40:42.787 7729-7837/com.xmltestservers W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
12-21 14:40:42.787 7729-7837/com.xmltestservers W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
12-21 14:40:42.788 7729-7837/com.xmltestservers W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
12-21 14:40:42.788 7729-7837/com.xmltestservers W/System.err:     at java.lang.Thread.run(Thread.java:818)
12-21 14:40:42.788 7729-7837/com.xmltestservers W/System.err: Caused by: java.io.EOFException: \n not found: size=57 content=f1f1f1340079c1eed5d9043324501c4ae6700647e093ea8a18b2e42c9d2acbd8...
12-21 14:40:42.789 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:200)
12-21 14:40:42.790 7729-7837/com.xmltestservers W/System.err:     at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:191)
12-21 14:40:42.790 7729-7837/com.xmltestservers W/System.err:   ... 14 more

Answer 1

嘗試此代碼以讀取響應

BufferedReader in = new BufferedReader(
            new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();

Answer 2

事實證明，響應沒有任何標題，我認為這是問題所在。 我用HTTPClient嘗試了HTTPClient ，但沒有響應，因為響應中沒有標頭（我認為異常不是有效的HTTP響應）。 之后，我嘗試使用Socket並成功了。 這是代碼：

Socket socket = new Socket(url.getHost(), url.getPort());
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
out.write(hardcodedRequest);
out.flush();

InputStream inStream = socket.getInputStream();

byte[] resp = new byte[hardcodedResponse.length];
int res = inStream.read(resp);

//Check if the response is the correct one.
if (!Arrays.equals(resp, hardcodedResponse) && res != hardcodedResponse.length) {

}
out.close();

我知道響應的支持是什么，因此我對其進行了硬編碼，並將其與服務器的響應進行比較。