Question

运行xml-rcp服务器和客户端。尝试将请求记录到服务器。但是过早结束文件错误。谁能看到我做错了什么？

 public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException

 ServletInputStream sis = req.getInputStream();
 int len = req.getContentLength();
 byte[] bytes = new byte[len]; 

 int offset = 0;  
 int numRead = 0;  
 while ((offset < bytes.length) && (numRead=sis.read(bytes, offset, bytes.length-offset)) >= 0) {  
       offset += numRead;  
   }  

   if (offset < bytes.length) {  
       throw new IOException("Could not complete reading request body");  
   }  

   sis.close();  

   FileOutputStream f = new FileOutputStream(new File("C:\\Users\\test\\file.log"), true);
   f.write(bytes);  
   f.flush();
   f.close();

   super.doPost(req, res);
 }

[致命错误]：1：1：文件提前结束。

redstone.xmlrpc.XmlRpcException：解析期间出现问题在redstone.xmlrpc.XmlRpcParser.parse（未知来源） at redstone.xmlrpc.XmlRpcDispatcher.dispatch（Unknown Source） at redstone.xmlrpc.XmlRpcServer.execute（Unknown Source） at redstone.xmlrpc.XmlRpcServlet.doPost（Unknown Source）在com.devices.test.servlet.MyXmlRpcServlet.doPost（MyXmlRpcServlet.java:93）在javax.servlet.http.HttpServlet.service（HttpServlet.java:727）在javax.servlet.http.HttpServlet.service（HttpServlet.java:820）在org.eclipse.jetty.servlet.ServletHolder.handle（ServletHolder.java:565）在org.eclipse.jetty.servlet.ServletHandler.doHandle（ServletHandler.java:479） at org.eclipse.jetty.server.handler.ContextHandler.doHandle（ContextHandler.java:1031）在org.eclipse.jetty.servlet.ServletHandler.doScope（ServletHandler.java:406）在org.eclipse.jetty.server.handler.ContextHandler.doScope（ContextHandler.java:965）在org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:117）在org.eclipse.jetty.server.handler.HandlerWrapper.handle（HandlerWrapper.java:111）在org.eclipse.jetty.server.Server.handle（Server.java:349） at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest（AbstractHttpConnection.java:452） at org.eclipse.jetty.server.AbstractHttpConnection.content（AbstractHttpConnection.java:894） at org.eclipse.jetty.server.AbstractHttpConnection $ RequestHandler.content（AbstractHttpConnection.java:948）在org.eclipse.jetty.http.HttpParser.parseNext（HttpParser.java:857）在org.eclipse.jetty.http.HttpParser.parseAvailable（HttpParser.java:235） at org.eclipse.jetty.server.AsyncHttpConnection.handle（AsyncHttpConnection.java:77）在org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle（SelectChannelEndPoint.java:609）在org.eclipse.jetty.io.nio.SelectChannelEndPoint $ 1.run（SelectChannelEndPoint.java:45）在org.eclipse.jetty.util.thread.QueuedThreadPool.runJob（QueuedThreadPool.java:599）在org.eclipse.jetty.util.thread.QueuedThreadPool $ 3.run（QueuedThreadPool.java:534）在java.lang.Thread.run（Thread.java:722）引起：org.xml.sax.SAXParseException; lineNumber：1; columnNumber：1;文件过早结束 at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse（AbstractSAXParser.java:1236） ......还有26个

溶液

 import javax.servlet.ServletException;
 import javax.servlet.ServletInputStream;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletRequestWrapper;
 import javax.servlet.http.HttpServletResponse;

 public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
 {
 CustomHttpServletRequestWrapper wrapper = new CustomHttpServletRequestWrapper((HttpServletRequest) req);

 ServletInputStream sis = wrapper.getInputStream();
 String StringFromInputStream = IOUtils.toString(sis, "UTF-8");
 LOG.info( "request:");
 LOG.info( StringFromInputStream );
 super.doPost(wrapper, res);
 }


 public class CustomHttpServletRequestWrapper extends HttpServletRequestWrapper
 {

  private final String body;
  private final Logger LOG = LoggerFactory.getLogger( CustomHttpServletRequestWrapper.class );

  public CustomHttpServletRequestWrapper( final HttpServletRequest request )
  {
     super( request );

     final StringBuilder stringBuilder = new StringBuilder();
     BufferedReader bufferedReader = null;

     try
     {
        final InputStream inputStream = request.getInputStream();

        if (inputStream != null)
        {
           bufferedReader = new BufferedReader( new InputStreamReader( inputStream ) );

           final char[] charBuffer = new char[128];
           int bytesRead = -1;

           while (( bytesRead = bufferedReader.read( charBuffer ) ) > 0)
           {
              stringBuilder.append( charBuffer, 0, bytesRead );
           }
        }
        else
        {
           stringBuilder.append( "" );
        }
     }
     catch (final IOException ex)
     {
        LOG.error( "Error reading the request body..." );
     }
     finally
     {
        if (bufferedReader != null)
        {
           try
           {
              bufferedReader.close();
           }
           catch (final IOException ex)
           {
              LOG.error( "Error closing bufferedReader..." );
           }
        }
     }

     body = stringBuilder.toString();
     LOG.info( "body:" );
     LOG.info( body );
  }

  @Override
  public ServletInputStream getInputStream() throws IOException
  {
     final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream( body.getBytes() );

     final ServletInputStream inputStream = new ServletInputStream()
     {
        @Override
        public int read() throws IOException
        {
           return byteArrayInputStream.read();
        }
     };

     return inputStream;
  }

}

Answer 1

您已经消耗了随请求发送的所有数据，因此super.doPost(...)方法没有任何剩余！

您可以将HttpServletRequestWrapper传递给super.doPost(...)。它应该包装原始请求，但返回一个不同的InputStream，它由您已在此方法中读取的字节数组支持。另请注意，还需要包装可以从请求中获取的阅读器（HttpServletRequest#getReader()）。

另请参阅How to log response content from a java web server，您可以在那里找到有关日志记录相反方面的完整代码示例。我认为它可以很容易地被用于你需要的东西。

文件SAXParseException HttpServletRequest过早结束

1 个答案: