webservice客戶端調用服務端異常 —— 遠程主機強迫關閉了一個現有的連接
最近遇到一個比較棘手的問題：
問題是這樣的，搭建了一個webservice的服務平臺，讓後提供給多個接口調用，有兩家接口調用了同樣的一個方法，但是第一家的接口從來沒有出現過問題，而另一家就奇怪了，最近總是出現 socket通信中斷的情況，客戶端報錯如下：
調用WebService時找不到方法：doDownloadRecipeInfo。原因：System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. --->
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at
at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
--- End of inner exception stack trace ---
at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at EnterpriseServerBase.WebService.DynamicWebCalling.HdyyElectronicService.doDownloadRecipeInfo(String userName, String password, String senderCode)
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at XmlTrans.Core.WSHelperCore.InvokeWebServiceMethod(String methodname, Object[] args)
而在服務端報錯為：
2018-03-27 10:09:35,996-135315 ERROR [org.apache.axis2.transport.http.CommonsHTTPTransportSender] (http-apr-8082-exec-1:)
org.apache.axis2.AxisFault
at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:78)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.sendUsingOutputStream(CommonsHTTPTransportSender.java:364)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:241)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:43)
at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2442)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2431)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.ctc.wstx.exc.WstxIOException: null
at com.ctc.wstx.sw.BaseStreamWriter.finishDocument(BaseStreamWriter.java:1692)
at com.ctc.wstx.sw.BaseStreamWriter.close(BaseStreamWriter.java:288)
at org.apache.axiom.util.stax.wrapper.XMLStreamWriterWrapper.close(XMLStreamWriterWrapper.java:46)
at org.apache.axiom.om.impl.MTOMXMLStreamWriter.close(MTOMXMLStreamWriter.java:222)
at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:192)
at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:74)
... 28 more
Caused by: ClientAbortException: java.io.IOException
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:413)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:359)
at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:333)
at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:101)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:124)
at com.ctc.wstx.io.UTF8Writer.flush(UTF8Writer.java:99)
at com.ctc.wstx.sw.BufferingXmlWriter.flush(BufferingXmlWriter.java:214)
at com.ctc.wstx.sw.BufferingXmlWriter.close(BufferingXmlWriter.java:194)
at com.ctc.wstx.sw.BaseStreamWriter.finishDocument(BaseStreamWriter.java:1690)
... 33 more
Caused by: java.io.IOException
at org.apache.coyote.http11.InternalAprOutputBuffer.flushBuffer(InternalAprOutputBuffer.java:205)
at org.apache.coyote.http11.InternalAprOutputBuffer.access$100(InternalAprOutputBuffer.java:37)
at org.apache.coyote.http11.InternalAprOutputBuffer$SocketOutputBuffer.doWrite(InternalAprOutputBuffer.java:235)
at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:93)
at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:192)
at org.apache.coyote.Response.doWrite(Response.java:520)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:408)
... 42 more
2018-03-27 10:09:35,998-135317 ERROR [org.apache.axis2.transport.http.CommonsHTTPTransportSender] (http-apr-8082-exec-1:)
org.apache.axis2.AxisFault
at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:78)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.sendUsingOutputStream(CommonsHTTPTransportSender.java:364)
at org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:241)
at org.apache.axis2.engine.AxisEngine.sendFault(AxisEngine.java:526)
at org.apache.axis2.transport.http.AxisServlet.handleFault(AxisServlet.java:433)
at org.apache.axis2.transport.http.AxisServlet.processAxisFault(AxisServlet.java:398)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:188)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2442)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2431)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.ctc.wstx.exc.WstxIOException: null
at com.ctc.wstx.sw.BaseStreamWriter.finishDocument(BaseStreamWriter.java:1692)
at com.ctc.wstx.sw.BaseStreamWriter.close(BaseStreamWriter.java:288)
at org.apache.axiom.util.stax.wrapper.XMLStreamWriterWrapper.close(XMLStreamWriterWrapper.java:46)
at org.apache.axiom.om.impl.MTOMXMLStreamWriter.close(MTOMXMLStreamWriter.java:222)
at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:192)
at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:74)
... 26 more
Caused by: ClientAbortException: java.io.IOException
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:413)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:480)
at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:359)
at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:333)
at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:101)
at com.ctc.wstx.io.UTF8Writer.flush(UTF8Writer.java:99)
at com.ctc.wstx.sw.BufferingXmlWriter.flush(BufferingXmlWriter.java:214)
at com.ctc.wstx.sw.BufferingXmlWriter.close(BufferingXmlWriter.java:194)
at com.ctc.wstx.sw.BaseStreamWriter.finishDocument(BaseStreamWriter.java:1690)
... 31 more
Caused by: java.io.IOException
at org.apache.coyote.http11.InternalAprOutputBuffer.flushBuffer(InternalAprOutputBuffer.java:205)
at org.apache.coyote.http11.InternalAprOutputBuffer.access$100(InternalAprOutputBuffer.java:37)
at org.apache.coyote.http11.InternalAprOutputBuffer$SocketOutputBuffer.doWrite(InternalAprOutputBuffer.java:235)
at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:93)
at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:192)
at org.apache.coyote.Response.doWrite(Response.java:520)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:408)
... 39 more
更具客戶端和服務端的報錯，知道是Socket IO異常造成的，但是好好的用著為什麽就出現了IO讀寫異常了呢？平常也都是這樣用的呀!
帶著滿臉的疑問，開始尋找問題所在吧。
首先，就是在網上找各種解決辦法，網上說法很多，最早是以為webservice的方法沒有成功調通就被關掉了，後來經過測試，證明服務是能夠被成功調通的，只是webservice方法返回給客戶端返回值的時候出現異常，導致socket通信中斷。那為什麽返回數據的時候會導致通信連接被斷掉呢？在網上搜答案，網上各種說法都有，
其中傾向於了關於客戶端和服務端等待超時的設置，那就試試修改一下等待超時時常的設置吧，
我使用的客戶端的調用的方法如下：
1 public static String doDownloadRecipeInfo(String username,String password ,String senderCode ) { 2 3 String result = ""; 4 String url =XmlUtil.queryInfo(1).getWebserviceURL();//通過公共類獲取webservice的URL 5 String qname=XmlUtil.queryInfo(1).getQname();//通過公共類獲取webservice發布的服務名 6 7 8 try { 9 10 logger.setLevel(Level.DEBUG); 11 Service service = new Service(); 12 Call call = (Call) service.createCall(); 13 call.setTargetEndpointAddress(new java.net.URL(url)); 14 call.setOperationName(new QName(qname, "doDownloadRecipeInfo")); 15 call.addParameter("userName", org.apache.axis.encoding.XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN); 16 call.addParameter("password", org.apache.axis.encoding.XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN); 17 call.addParameter("senderCode", org.apache.axis.encoding.XMLType.XSD_STRING, javax.xml.rpc.ParameterMode.IN); 18 call.setReturnType(org.apache.axis.encoding.XMLType.XSD_STRING); 19 call.setUseSOAPAction(true); 20 call.setTimeout(1000*200);//設置客戶端的等待超時時間 21 22 call.setSOAPActionURI(qname+"doDownloadRecipeInfo"); 23 24 25 26 27 result = (String) call.invoke(new Object[]{username,password ,senderCode}); 28 } catch (Exception e) { 29 e.printStackTrace(); 30 //logger.error("調用平臺接口方法doDownloadRecipeStatusInfo失敗", e); 31 } 32 // logger.info("返回信息" + result); 33 if(result!=null&& result.length()>0){ 34 System.out.println(result); 35 } 36 return result; 37 } 38
服務端的設置，在服務端的tomcat下的conf文件夾下的 server.xml中修改連接超時時長
<Connector port="18558" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8444" /> <!-- 將上面中的connectionTimeout參數調整的大一點 -->
然後嘗試執行客戶端的程序調用服務端的方法，但是執行了幾分鐘之後仍然報錯，連接被掛掉了！
因為調用webservice方法之後返回的XML格式的數據太長了，我想從簡單的驗證，就將返回的XML格式的數據弄短了些，讓後仍然將等待時間設置長了點，重新執行客戶端的程序之後數據成功獲取到了；為了驗證是等待超時的問題還是數據太長的原因，我將等待超時設置默認的值，然後重新調用webservice，結果是失敗；然後我又將等待時長調大，然後將返回的XML數設置長，測試的結果是連接又被幹掉了！
讓後我在網上了解，看到有人在網上回答：數據太大的話，比如一下返回的數據是10M的，網絡連接很快就會被掛掉了！
同時，經驗證，如果數據稍微大點，比如3-4M，有時候可以通過稍微調大等待超時時長來解決問題，但是如果數據偏大的話，比如10M，調大等待超時時長也無濟於事，Socket連接很快會被幹掉，只要數據一直這麽大，連接就會被不斷的幹掉。
所以經過不斷調試，調整了webservice方法返回的數據的大小，並稍微調大了等待超時時長，再次運行服務端和客戶程序之後，數據穩定的進行處理和傳輸。
總結：webservice只適用於小數據的傳輸，不要嘗試使用webservice進行大數據的傳輸。
webservice客戶端調用服務端異常 —— 遠程主機強迫關閉了一個現有的連接