Question

我在套接字上编写客户端 - 服务器应用程序，我有设计自己的协议的任务。客户端和服务器与xml通信。我使用JAXB库。客户端完美地将XML写入输出流。但我无法在服务器中阅读它。您能否展示如何正确地从客户端收回数据？

这是Client：

public class Client {
    public static final String SERVER_HOST = "localhost";
    public static final Integer SERVER_PORT = 4444;
    public static final Logger LOG = Logger.getLogger(Client.class);

    public static void main(String[] args) throws IOException {

        System.out.println("Welcome to Client side");
        XMLProtocol protocol = new XMLProtocol();
        Socket fromserver = null;

        fromserver = new Socket(SERVER_HOST, SERVER_PORT);

        BufferedReader in = new BufferedReader(new InputStreamReader(fromserver.getInputStream()));

        PrintWriter out = new PrintWriter(fromserver.getOutputStream(), true);

        BufferedReader inu = new BufferedReader(new InputStreamReader(System.in));

        String fuser, fserver;

        while ((fuser = inu.readLine()) != null) {

            protocol.setComId((long) 0);
            protocol.setContent("Client content");
            protocol.setLogin("User");

            try {

                JAXBContext jaxbContext = JAXBContext.newInstance(XMLProtocol.class);
                Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
                jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
                jaxbMarshaller.marshal(protocol, out);

            } catch (JAXBException e) {
                LOG.error("Error while processing protocol"+e);             
            }

            fserver = in.readLine();

            System.out.println(fserver);

            if (fuser.equalsIgnoreCase("close"))
                break;
            if (fuser.equalsIgnoreCase("exit"))
                break;
        }

        out.close();
        in.close();
        inu.close();
        fromserver.close();
    }

}

和服务器：

package dataart.practice.server;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import org.apache.log4j.Logger;

public class Server {

    public static final Logger LOG = Logger.getLogger(Server.class);
    public static final String SERVER_HOST = "localhost";
    public static final Integer SERVER_PORT = 4444;
    public static Integer userCount = 0;

    public static void main(String[] args) throws IOException {

        LOG.trace("Server started");
        ServerSocket s = new ServerSocket(SERVER_PORT);

        try {
            while (true) {
                LOG.trace("Waiting for connections...");
                Socket socket = s.accept();

                try {
                    new ServerThread(socket);
                    LOG.trace("Users in the chat: "+(userCount+1));
                    userCount++;

                } catch (IOException e) {
                    socket.close();
                }
            }
        } finally {
            s.close();
        }
    }
}

我的主题。

public class ServerThread extends Thread {
    private static final Logger LOG = Logger.getLogger(ServerThread.class);
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;
    private String buffer;
        public ServerThread(Socket s) throws IOException {
        socket = s;
        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
        start();
    }

    public void run() {
        try {
            while (true) {

            //  if ((buffer = in.readLine()).endsWith("</xmlProtocol>")) {
                    JAXBContext jaxbContext = JAXBContext.newInstance(XMLProtocol.class);
                    Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
                    sXMLProtocol protocol = (XMLProtocol) jaxbUnmarshaller.unmarshal(in);
                    LOG.trace("Getting message from user" + protocol.getContent());
                }
                LOG.trace("Nop");
            }
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        } finally {
            try {
                socket.close();
                LOG.trace("Socket closed");
            } catch (IOException e) {
                LOG.error("Socket no closed" + e);
            }
        }
    }
}

我应该在Server上编写什么来解析我得到的XML？我尝试解析InputStream。

Edit my question: 现在它显示异常。我改变了马歇尔参数。

DefaultValidationEventHandler：[FATAL_ERROR]：元素类型＆＃34; xmlProtent＆＃34;必须遵循属性规范，＆＃34;＆gt;＆＃34;或＆＃34; /＆gt;＆＃34;。地点：2号线 javax.xml.bind.UnmarshalException：prolog中不允许使用内容。 - 链接异常： [org.xml.sax.SAXParseException; lineNumber：1; columnNumber：1;序言中不能有内容。] DefaultValidationEventHandler：[FATAL_ERROR]：prolog中不允许使用内容。地点：1号线 at com.sun.xml.bind.v2.runtime.SAXUnmarshallerHandlerImpl.handleEvent（SAXUnmarshallerHandlerImpl.java:870） at com.sun.xml.bind.v2.runtime.ErrorHandlerAdaptor.propagateEvent（ErrorHandlerAdaptor.java:82） at com.sun.xml.bind.v2.runtime.ErrorHandlerAdaptor.fatalError（ErrorHandlerAdaptor.java:58） at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError（ErrorHandlerWrapper.java:180） at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError（XMLErrorReporter.java:441） at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError（XMLErrorReporter.java:368） at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError（XMLScanner.java:1375） at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl $ PrologDriver.next（XMLDocumentScannerImpl.java:996） at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next（XMLDocumentScannerImpl.java:607） at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next（XMLNSDocumentScannerImpl.java:116） at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument（XMLDocumentFragmentScannerImpl.java:488）在com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse（XML11Configuration.java:835） at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse（XML11Configuration.java:764）在com.sun.org.apache.xerces.internal.parsers.XMLParser.parse（XMLParser.java:123）在com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse（AbstractSAXParser.java:1210） at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl $ JAXPSAXParser.parse（SAXParserImpl.java:568） at com.sun.xml.bind.v2.runtime.UnmarshallerImpl.unmarshal（UnmarshallerImpl.java:160）在javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:157）在javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:214） at dataart.practice.server.ServerThread.run（ServerThread.java:41）引起：org.xml.sax.SAXParseException; lineNumber：1; columnNumber：1;序言中不能有内容。 at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException（ErrorHandlerWrapper.java:198） at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError（ErrorHandlerWrapper.java:177） ......还有16个 javax.xml.bind.UnmarshalException：元素类型＆＃34; xmlProtent＆＃34;必须遵循属性规范，＆＃34;＆gt;＆＃34;或＆＃34; /＆gt;＆＃34;。 - 链接异常： [org.xml.sax.SAXParseException; lineNumber：2; columnNumber：12;元素类型＆＃34; xmlProtent＆＃34;必须遵循属性规范，＆＃34;＆gt;＆＃34;或＆＃34; /＆gt;＆＃34;。] at com.sun.xml.bind.v2.runtime.SAXUnmarshallerHandlerImpl.handleEvent（SAXUnmarshallerHandlerImpl.java:870） at com.sun.xml.bind.v2.runtime.ErrorHandlerAdaptor.propagateEvent（ErrorHandlerAdaptor.java:82） at com.sun.xml.bind.v2.runtime.ErrorHandlerAdaptor.fatalError（ErrorHandlerAdaptor.java:58） at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError（ErrorHandlerWrapper.java:180） at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError（XMLErrorReporter.java:441） at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError（XMLErrorReporter.java:368） at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError（XMLScanner.java:1375） at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.seekCloseOfStartTag（XMLDocumentFragmentScannerImpl.java:1354） at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement（XMLNSDocumentScannerImpl.java:245） at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl $ NSContentDriver.scanRootElementHook（XMLNSDocumentScannerImpl.java:602） at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl $ FragmentContentDriver.next（XMLDocumentFragmentScannerImpl.java:3063） at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl $ PrologDriver.next（XMLDocumentScannerImpl.java:881） at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next（XMLDocumentScannerImpl.java:607） at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next（XMLNSDocumentScannerImpl.java:116） at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument（XMLDocumentFragmentScannerImpl.java:488）在com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse（XML11Configuration.java:835） at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse（XML11Configuration.java:764）在com.sun.org.apache.xerces.internal.parsers.XMLParser.parse（XMLParser.java:123）在com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse（AbstractSAXParser.java:1210） at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl $ JAXPSAXParser.parse（SAXParserImpl.java:568） at com.sun.xml.bind.v2.runtime.UnmarshallerImpl.unmarshal（UnmarshallerImpl.java:160）在javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:157）在javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal（AbstractUnmarshallerImpl.java:214） at dataart.practice.server.ServerThread.run（ServerThread.java:41） at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1110） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:603）在java.lang.Thread.run（Thread.java:722）引起：org.xml.sax.SAXParseException; lineNumber：2; columnNumber：12;元素类型＆＃34; xmlProtent＆＃34;必须遵循属性规范，＆＃34;＆gt;＆＃34;或＆＃34; /＆gt;＆＃34;。 at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException（ErrorHandlerWrapper.java:198） at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError（ErrorHandlerWrapper.java:177） ......还有23个

Answer 1

您是否尝试过调试行

    (buffer = in.readLine()).endsWith("</xmlProtocol>")

可能结果是假的

客户端服务器，设计协议

1 个答案: