Java套接字可以'；t运行调用命令

因此，对于我正在使用的一个类，我们有一个基于Java套接字的赋值，我们必须将一个字符串从客户端传递到服务器端，该字符串将删除所有的前导和尾随空格。代码如下：

TrimClient：

import java.io.*; 
import java.net.*; 
public class TrimClient
{
    public static void main (String [] args)
    {
        Socket s; //Client socket for connecting to the server 
        String server = "localhost"; //Use localhost by default
        int serverPort = 1221; //Use port 1221 by default
        InetAddress local, remote; //Local and remote addresses
        int localPort, remotePort; //Local and remote ports 

        //For input and output
        BufferedReader socketIn; //Socket input
        PrintWriter socketOut; //Socket output
        BufferedReader keyboardIn; //Keyboard input
        String userInput, serverResult; 

        //Process command line arguments
        //Error if more than two command line arguments
        if (args.length > 2) 
        {
            System.out.println("Usage: java TrimClient "
                               + "[-port=<number>] [server]");
            System.exit(-1); 
        }
        //If two arguments, only one should start with '-' 
        if (args.length == 2) 
        {
            if ((args[0].charAt(0) == '-' && 
                 args[1].charAt(0) == '-' ) ||
                (args[0].charAt(0) != '-' && 
                 args[1].charAt(0) != '-' ))
        {
                    System.out.println("Usage: "
                                   + "java TrimClient "
                                   + "[-port=<number>] [server]");
                    System.exit(-1);
                }
        }    
        //Set the server and server port suitably 
        for (int i = 0; i < args.length; i++)
        {
            if (args[i].charAt(0) != '-') 
                server = args[i]; 
            if (args[i].startsWith("-port="))
                serverPort = Integer.parseInt(args[i].substring(6)); 

        }  
        //Set up keyboard input and print greeting 
        keyboardIn = new BufferedReader(new InputStreamReader(System.in)); 
        System.out.println("Hello, you have invoked a Trim Client"); 
        System.out.println("You have requested a connection to " + 
                           server + " at port " + serverPort); 
        System.out.println(); //Blank line
        //Establish socket connection and communicate
        try 
        {
            //Establish connection 
            s = new Socket(server, serverPort); 
            //Report connection status 
            local = s.getLocalAddress(); remote = s.getInetAddress(); 
            localPort = s.getLocalPort(); remotePort = s.getPort(); 
            System.out.println ("Client side"); 
            System.out.println ("   " + local.getHostName() 
                                + "[" + local.getHostAddress() + "]" 
                                + " at port " + localPort);
            System.out.println ("Server side"); 
            System.out.println ("   " + remote.getHostName()
                                + "[" + remote.getHostAddress() + "]" 
                                + " at port " + remotePort); 
            System.out.println(); //Blank line
            //TCP provides a full-duplex byte stream service
            //For UNICODE and line support, we need BufferedReader 
            //and PrintWriter objects
            socketIn = new BufferedReader(new InputStreamReader(s.getInputStream())); 
            socketOut = new PrintWriter(s.getOutputStream(), true);
            //Interact with user
            System.out.print("Enter a string (or press "Enter" to quit): "); 
            userInput = keyboardIn.readLine(); 
            //Loop until user indicates termination 
            while (!userInput.equalsIgnoreCase(" "))
            {
                //Send user input to server
                socketOut.println(userInput); 
                //Get server response 
                serverResult = socketIn.readLine(); 
                //Report server response 
                System.out.println(serverResult); 
                System.out.println(); //Blank line
                //Get new string
                System.out.print("Enter a string (or press "Enter" to quit): "); 
                userInput = keyboardIn.readLine(); 
            }
            //Signal the server to quit 
            socketOut.println(userInput); 
            //Close all streams and socket 
            keyboardIn.close();
            socketIn.close(); 
            socketOut.close(); 
            s.close(); 
        }
        catch (Exception e)
        {
            e.printStackTrace(); 
        }
    }    
}

我收到一个错误，该错误在线程“main”java.lang.NoClassDefFoundError:Trim Server中表示异常

Caused by: java.lang.ClassNotFoundException: TrimServer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Naitve Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

---

您能指出导致异常的代码行吗？它没有显示导致错误的代码行。我收到的只是文章末尾的错误消息。所以我猜atm唯一相关的代码是TrimServer部分。你确定这是完整的堆栈跟踪吗？它似乎不包括来自应用程序的任何方法调用。我对它是全新的，所以如果StackTrace指的是它给我的异常，那么是的。我们应该制作2个文件，我假设我做得正确，然后使用我提供的两个命令在客户端和服务器之间建立连接（***用于检查地址以防其敏感数据）。这是在两台不同的机器上使用PuTTy的两个不同实例完成的。我刚刚在我的计算机上测试了它，它实际上可以工作（在修复了一些编译时（编程阶段/编写代码）错误之后）。您是否确定您的文件已正确编译，并且在运行时（运行阶段/应用程序已启动）找到了二进制

.class

文件？这些是你应该问老师的问题。显然，他没有涵盖一些非常重要的步骤（或者在他提到这些步骤的时候你没有听）。当您输入字符串时（或按“回车”键退出）：“，您必须转义字符串中的引号：

“输入字符串（或按“回车”键退出）：”

java TrimServer -port=1221
java TrimClient -port=1221 **********

Caused by: java.lang.ClassNotFoundException: TrimServer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Naitve Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)