从 POST 获取输入流时出现 JAVA EOFException

Question

我试图从 POST 获得响应，但是当我输入 throws 和 exception 时

     try {
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // Marcamos a 3s el tiempo maximo de espera
            conn.setReadTimeout(30000000);
            conn.setUseCaches(true);
            conn.setFixedLengthStreamingMode(bytes.length);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type",
                "application/x-www-form-urlencoded;charset=UTF-8");
            // post the request
            // Abrimos una señal de salida
            OutputStream out = conn.getOutputStream();
            out.write(bytes);
            out.flush();
            String buffer;
            // Abrimos una señal de entrada
here is where android throws and exception
            InputStreamReader ip = new InputStreamReader(conn.getInputStream());
            BufferedReader in2 = new BufferedReader(ip);
            // Bucle que recoge todas las respuestas

            while ((buffer = in2.readLine()) != null) {
                Log.e(" ", buffer);
            }
            // Cerramos las señales de entrada y salida
            in2.close();
            out.close();

        } catch (IOException e) {
            Log.e(TAG, "ERROR" + e.toString());
            e.printStackTrace();
        } finally {
            conn.disconnect();
        }

而 LOG TAG 显示：

08-01 10:05:53.223: E/WooWMe GCM(798): ERRORjava.io.EOFException
08-01 10:05:53.223: W/System.err(798): java.io.EOFException
08-01 10:05:53.233: W/System.err(798):  at libcore.io.Streams.readAsciiLine(Streams.java:203)
08-01 10:05:53.233: W/System.err(798):  at libcore.net.http.HttpEngine.readResponseHeaders(HttpEngine.java:560)
08-01 10:05:53.233: W/System.err(798):  at libcore.net.http.HttpEngine.readResponse(HttpEngine.java:813)
08-01 10:05:53.233: W/System.err(798):  at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:274)
08-01 10:05:53.233: W/System.err(798):  at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
08-01 10:05:53.233: W/System.err(798):  at com.egartec.woowme.ChatActivity$3.doInBackground(ChatActivity.java:230)
08-01 10:05:53.233: W/System.err(798):  at com.egartec.woowme.ChatActivity$3.doInBackground(ChatActivity.java:1)
08-01 10:05:53.233: W/System.err(798):  at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-01 10:05:53.244: W/System.err(798):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-01 10:05:53.244: W/System.err(798):  at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-01 10:05:53.244: W/System.err(798):  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-01 10:05:53.253: W/System.err(798):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-01 10:05:53.253: W/System.err(798):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-01 10:05:53.253: W/System.err(798):  at java.lang.Thread.run(Thread.java:856)

Answer 1

如果你使用

conn.getInputStream()

每次请求不成功都会抛出java.io.FileNotFoundException，基本上是任何400以上的HTTP响应码。在这种情况下，您的响应正文位于

conn.getErrorStream()

因此，在决定从哪个流读取之前，您必须检查 HTTP 响应代码：

int status = conn.getResponseCode();
BufferedInputStream in;
if (status >= 400 ) {
    in = new BufferedInputStream( conn.getErrorStream() );
} else {
    in = new BufferedInputStream( conn.getInputStream() );
}

我没有包括从流中读取的内容，因为这很简单:)

Answer 2

我在我的应用程序中使用了一次 http post，使用此代码，它运行良好。如果你愿意，你可以试试。

public void posthttp()
{

    URL= your url
    InputStream is = null;
    String val1;
    String val2;
    ArrayList<NameValuePair> namevaluepair =new  ArrayList<NameValuePair>();

    //Making HTTP request
    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();

        namevaluepair.add(new BasicNameValuePair("val1",val1));
        namevaluepair.add(new BasicNameValuePair("val2",val2));


        String enc_url = urlEncode(URL);
        HttpPost httpPost = new HttpPost(enc_url );

         httpPost.setEntity(new UrlEncodedFormEntity(namevaluepair));
         HttpResponse httpResponse = httpClient.execute(httpPost);
         HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();            

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

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        is.close();
        String responseFromServer = sb.toString();

    } catch (Exception e) {
        Log.e("Buffer Error", "Error converting result " + e.toString());
    }

}