GAE中的IOException异常1.7.4

我从将gae-server发送到客户端的数据有问题。一切工作在本地环境中，但不在Google的服务器环境中，我得到一个IOException。所有的GAE中的IOException异常1.7.4

首先，我一个JSON文件发送到我的GAE服务器...

url = new URL("http://xxxserver.appspot.com/xxxserver") 
       HttpURLConnection connection = (HttpURLConnection)url.openConnection(); 
      connection.setRequestMethod("POST"); 
      connection.setRequestProperty("Content-Type", "application/json"); 
      connection.setRequestProperty("Content-Length", "" + json.toString().getBytes("UTF8").length); 
      connection.setRequestProperty("Content-Language", "en-US"); 
      connection.setUseCaches (false); 
      connection.setDoInput(true); 
      connection.setDoOutput(true);  
      connection.setConnectTimeout(40000); //40 seconds

的JSON字符串，whick应发回正确创建。它看起来像如下：

{"location1 cost_char":"0.77","location1 cost_reim":"0.0","location2 dist":"34.02","location1 dist":"2.76"}

服务器接收文件，正确创建JSON字符串，但随后一个IOException崩溃时，它应该刷新JSON字符串回：

//Send data to server 
    try { 
    resp.setContentLength(json.toString().getBytes("UTF8").length); 
    resp.setContentType("application/json"); 
     Writer wr = new BufferedWriter (new OutputStreamWriter (resp.getOutputStream()));   
     try { 
      wr.write(json.toString()); 
      wr.flush();  //crash!!!!!!!!!!!!! 
     } 
     finally { 
      if (wr != null) 
        logger.info(TAG +"test6"); 
       wr.close(); 
     } 
    } 
    catch (IOException e) { 
     e.printStackTrace(); 
     logger.info(TAG +": IO Error"); 
     String temp = getStackTrace (e); 
    logger.warning(TAG +": Exception is: " +temp); 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
     logger.warning(TAG +": Exception is: " +e); 
    }

客户端接收数据：

//Get response from server 
      try { 
       InputStreamReader is = new InputStreamReader (connection.getInputStream()); 
       BufferedReader rd = new BufferedReader(is); //BufferedInputStreams works on byte streams. BufferedReaders works on character streams. 
       String line; 
       response = new StringBuffer();  
       try { 
        while((line = rd.readLine()) != null) { 
         response.append(line); 
         Log.d(TAG, "Received Data: " +line); 
        } 
        Log.v("Abrage:" ,"data received"); 
       } 
       finally { 
        if (rd != null) 
         rd.close(); 
       }

这里是堆栈跟踪：

com.lemtex.carpoolio.server.CarpoolioServerServlet doPost: CarpoolioServerServlet: Exception is: java.io.IOException: Closed 
at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:629) 
at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:579) 
at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:220) 
at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:290) 
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:294) 
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:140) 
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:229) 
at java.io.BufferedWriter.flush(BufferedWriter.java:253) 
at com.lemtex.carpoolio.server.CarpoolioServerServlet.doPost(CarpoolioServerServlet.java:387) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) 
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:57) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) 
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) 
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) 
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266) 
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
at org.mortbay.jetty.Server.handle(Server.java:326) 
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) 
at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) 
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146) 
at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447) 
at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:466) 
at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:473) 
at com.google.tracing.TraceContext.runInContext(TraceContext.java:694) 
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338) 
at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330) 
at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:470) 
at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) 
at java.lang.Thread.run(Thread.java:679)

任何解决方案？

来源

2013-04-04 user2242982

好吧，我解决我的问题。我关闭了OutputStream的与 resp.getOutputStream().close();数据被发送之前....

来源

2013-04-06 13:09:00 user2242982

resp.setContentLength(json.toString().getBytes("UTF8").length);

可能不是相同的长度，你用.toString()送什么，尤其是如果它不是纯ASCII，这我猜你要发送的ASCII字符集以外的扩展字符。

wr.write(json.toString());

并且服务器可能在整个字符串被写入之前关闭连接。要么获得String的实际长度，要么发送获得长度的.getBytes("UTF8")版本。你不能像你一样做到一半。

您没有显示足够的代码来实际诊断问题，我们所能做的只是猜测。

来源

2013-04-04 02:52:30

我改成了（我犯同样的错误，JSON发送到服务器时）： resp.setContentLength（json.toString（）长度（），但该IOException的问题仍然存在还\t resp.getOutputStream（）写（json.toString（）的getBytes（））;。。。。 \t \t \t \t resp.getOutputStream（）.flush（）; does not't。在本地环境一切工作正常。 – user2242982 2013-04-04 03:34:24

GAE中的IOException异常1.7.4

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