Question

我正在运行xSocket服务器，因此需要启动chat.jar，它似乎不会调用该部分。我的代码有什么问题？

如果我创建了一个xSocketserver.jar，那么exec是否能够启动任何外部jar？

import java.io.*;
import org.xsocket.connection.*;

public class xSocketServer
{
    protected static IServer srv = null;

    public static void main(String[] args)
    {
        try {
            srv = new Server("127.0.0.1",8090, new xSocketDataHandler());
            srv.run();
        }
        catch(Exception ex) {
            System.out.println(ex.getMessage());
        }

        try {
            System.out.println("setup exec");
            Process p = Runtime.getRuntime().exec("cmd java -jar D:\\chat.jar -n 0");
            p.waitFor();
            System.out.println("call exec");
        }
        catch(Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    protected static void shutdownServer() {
        try {
            srv.close();
        }
        catch(Exception ex) {
            System.out.println(ex.getMessage());
        }
    }
}

Answer 1

您应该阅读流程的输出流和错误流。您的命令可能失败，您无法看到错误，因为您没有读取错误流。

看看this article。

Answer 2

srv.run（）; - ＆GT;此调用不会像xSocket文档所说的那样返回，因此其余代码将不会执行。
进程p = Runtime.getRuntime（）。exec（“cmd java -jar D：\ chat.jar -n 0”）;
你应该用这样的参数数组调用exec：

进程p = Runtime.getRuntime（）。exec（new String [] {“cmd”，“java -jar D：\ chat.jar -n 0”}）;

它将清除程序运行和参数。

Answer 3

也许这就是你的意思？

public class XServer implements IDataHandler {

 /**
  * @param args
  * @throws IOException 
  * @throws UnknownHostException 
  */
 public static void main(String[] args) throws UnknownHostException, IOException {
  IServer server = new Server(8090,new XServer());
  server.start();
 }

 @Override
 public boolean onData(INonBlockingConnection nbc) throws IOException, BufferUnderflowException,
   ClosedChannelException, MaxReadSizeExceededException {
  String data = nbc.readStringByDelimiter("\r\n");
  nbc.write(data + "\r\n");

  System.out.println("setup exec");
        Process p = Runtime.getRuntime().exec(new String[]{"cmd","java -jar D:\\chat.jar -n 0"});
        try {
   p.waitFor();
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
        System.out.println("call exec");


  return true;
 }

}

在端口8090上telnet到您的localhost，输入一行文本，服务器将执行聊天程序。

Answer 4

 import java.io.IOException;
import java.nio.BufferUnderflowException;
import java.nio.channels.ClosedChannelException;
import java.util.*;
import org.xsocket.*;
import org.xsocket.connection.*;

public class xSocketDataHandler implements IDataHandler, IConnectHandler, IDisconnectHandler
{
    private Set<INonBlockingConnection> sessions = Collections.synchronizedSet(new HashSet<INonBlockingConnection>());

    public boolean onData(INonBlockingConnection nbc) throws IOException, BufferUnderflowException, ClosedChannelException, MaxReadSizeExceededException
    {
        try
        {
            String data = nbc.readStringByDelimiter("\0");
            //if(data.trim().length() > 0)
            //{
                //System.out.println("Incoming data: " + data);

                //nbc.write("+A4\0");
                /*
                if(data.equalsIgnoreCase("<policy-file-request/>"))
                {
                    nbc.write("<cross-domain-policy><allow-access-from domain=\"*\" to-ports=\"8090\"/></cross-domain-policy>\0");
                    return true;
                }
                 */
                //String[] message = data.split("~");
                String message = data;
                sendMessageToAll(message);

                //if(message.equalsIgnoreCase("SHUTDOWN"))
                  //  xSocketServer.shutdownServer();
            //}
        }
        catch(Exception ex)
        {
         System.out.println("onData2: " + ex.getMessage());
        }

        return true;
    }

    private void sendMessageToAll(String message)
    {
        try
        {
            synchronized(sessions)
            {
                Iterator<INonBlockingConnection> iter = sessions.iterator();

                while(iter.hasNext())
                {
                    INonBlockingConnection nbConn = (INonBlockingConnection) iter.next();

                    if(nbConn.isOpen())
                     nbConn.write(message+"\0");
                }
            }

            //System.out.println("Outgoing data: " + message);
        }
        catch(Exception ex)
        {
            System.out.println("sendMessageToAll: " + ex.getMessage());
        }
    }

    ////////////////////////////////////////////////////////////////////////////////////
    public boolean onConnect(INonBlockingConnection nbc) throws IOException, BufferUnderflowException, MaxReadSizeExceededException
    {
        try
        {
            synchronized(sessions)
            {
                sessions.add(nbc);
            }

            //System.out.println("onConnect");
        }
        catch(Exception ex)
        {
            System.out.println("onConnect: " + ex.getMessage());
        }

        return true;
    }

    public boolean onDisconnect(INonBlockingConnection nbc) throws IOException
    {
        try
        {
            synchronized(sessions)
            {
                sessions.remove(nbc);
            }

            //System.out.println("onDisconnect");
        }
        catch(Exception ex)
        {
            System.out.println("onDisconnect: " + ex.getMessage());
        }

        return true;
    }
}

无法调用Runtime.getRuntime（）。exec

4 个答案: