如何在ssh上测试客户端和服务器程序?

时间:2014-10-19 22:24:29

标签: java web-services sockets ssh client-server

我有两个程序,我希望它们连接到我的学校服务器afs1.njit.edu,但它永远不会连接。这就是我有文件的地方。我应该运行两个ssh程序来运行不同的程序吗?不确定如何测试它们。 (这是一个简单的在线示例,我想在编写代码之前进行测试)我将它们拼凑起来并且它们永远不会连接。

singleSocketserver.java

    public static void main(String[] args) {
try{
  socket1 = new ServerSocket(port);
  System.out.println("SingleSocketServer Initialized");
  int character;

  while (true) {
    connection = socket1.accept();

    BufferedInputStream is = new BufferedInputStream(connection.getInputStream());
    InputStreamReader isr = new InputStreamReader(is);
    process = new StringBuffer();
    while((character = isr.read()) != 13) {
      process.append((char)character);
    }
    System.out.println(process);
    //need to wait 10 seconds for the app to update database
    try {
      Thread.sleep(10000);
    }
    catch (Exception e){}
    TimeStamp = new java.util.Date().toString();
    String returnCode = "SingleSocketServer repsonded at "+ TimeStamp + (char) 13;
    BufferedOutputStream os = new BufferedOutputStream(connection.getOutputStream());
    OutputStreamWriter osw = new OutputStreamWriter(os, "US-ASCII");
    osw.write(returnCode);
    osw.flush();
 }
}
catch (IOException e) {}
  try {
    connection.close();
  }
  catch (IOException e) {}
  }
}

SocketClient.java

    public class SocketClient {

public static void main(String[] args) {
/** Define a host server */
String host = "afs1.njit.edu";
/** Define a port */
int port = 19999;

StringBuffer instr = new StringBuffer();
String TimeStamp;
System.out.println("SocketClient initialized");

try {
  /** Obtain an address object of the server */
  InetAddress address = InetAddress.getByName(host);
  /** Establish a socket connetion */
  Socket connection = new Socket(address, port);
  /** Instantiate a BufferedOutputStream object */
  BufferedOutputStream bos = new BufferedOutputStream(connection.
      getOutputStream());

  /** Instantiate an OutputStreamWriter object with the optional character
   * encoding.
   */
  OutputStreamWriter osw = new OutputStreamWriter(bos, "US-ASCII");


  TimeStamp = new java.util.Date().toString();
  String process = "Calling the Socket Server on "+ host + " port " + port +
      " at " + TimeStamp +  (char) 13;

  /** Write across the socket connection and flush the buffer */
  osw.write(process);
  osw.flush();

   /** Instantiate a BufferedInputStream object for reading
  /** Instantiate a BufferedInputStream object for reading
   * incoming socket streams.
   */

  BufferedInputStream bis = new BufferedInputStream(connection.
      getInputStream());
  /**Instantiate an InputStreamReader with the optional
   * character encoding.
   */

  InputStreamReader isr = new InputStreamReader(bis, "US-ASCII");

  /**Read the socket's InputStream and append to a StringBuffer */
  int c;
  while ( (c = isr.read()) != 13)
    instr.append( (char) c);

  /** Close the socket connection. */
  connection.close();
  System.out.println(instr);
 }
catch (IOException f) {
  System.out.println("IOException: " + f);
}
catch (Exception g) {
  System.out.println("Exception: " + g);
}
}

}

1 个答案:

答案 0 :(得分:1)

如果您尝试从家中连接到学校的计算机,那么您可能会遇到防火墙。通常,虽然并非总是如此,但允许从机器启动的连接,但只允许在某些端口上连接到机器。你可以设置你的ssh来隧道传输数据包,但是你也可以将2个程序紧挨着运行。

如果你在同一台机器上运行这两个程序,他们应该找到另一个程序,假设: 1:你可以打开插座 2:套接字尚未被其他程序占用 3:防火墙不阻塞这些端口。

要在学校机器上运行,你可以使用2个shell(ssh),但这不是必需的。你可以在后台运行接收器(在命令的末尾放一个&)然后运行发送器。但是,运行2个shell更容易,特别是如果程序像你的那样发送到sysout。

一些指针,如果您使用System.out(或System.err)进行调试/日志输出,当您使用异常时,如果您不想引入,我建议使用e.printStackTrace(System.out)一个图书馆。大多数日志记录框架都有一个logger.error(“message”,ex),而commons.lang也有一个异常打印机。

How can I convert a stack trace to a string?

在没有套接字连接的情况下,测试逻辑的一件事是使用PipedInputStream和PipedOutputStream。 http://docs.oracle.com/javase/7/docs/api/java/io/PipedInputStream.html但如果您确定自己的逻辑且需要测试套接字,则必须并排运行它们。