几天前在大学开始学习Java(主题是“服务器编程”),我们开始编写两个代码,分别充当客户端和服务器,因此客户端向服务器发送了一个包含3个数值的字符串,这必须应用一个数学公式(我不记得什么公式,但这没关系),然后将结果返回给客户端,客户端必须在屏幕上打印它或其他什么。
这是我的代码。我使用了老师讲授的一些课程,例如Socket和ServerSocket,但我知道代码中有一些错误,我找不到原因。在客户端联系服务器并且服务器为它打开一个套接字后,它停止工作。
客户端代码:
int capital = 300000;
int interes = 4;
int plazos = 360;
String IP_servidor = "127.0.0.1";
int puerto_servidor = 8801;
try{
// Connect with server
Socket servidor = new Socket (IP_servidor,puerto_servidor); // Se crea un socket para el servidor, con su IP para mandarle luego datos
//Server connected
//Preparing data
String datos = capital + ";" + interes + ";" + plazos;
//Data prepared
//Sending data
PrintWriter conexion = new PrintWriter(servidor.getOutputStream(),true); //Object "conexion" will be the one to which we'll write data the server will receive
conexion.println(datos);
//Data sent
// Server processes data and returns it
//Receiving data
Socket recepcion = new Socket (IP_servidor,puerto_servidor);
BufferedReader lector = new BufferedReader (new InputStreamReader (recepcion.getInputStream()));
String operacion = new String("");
operacion = lector.readLine();
//Data received back
// End
}
catch (IOException Err){
System.out.println("Error");
System.out.println(Err.getMessage());
}
和服务器的代码:
int puerto_servidor = 8801;
try{
// Server starts and connects with client
ServerSocket miServidor = new ServerSocket(puerto_servidor);
System.out.println("Socket created");
Socket cliente = miServidor.accept();
System.out.println("Petition from " + cliente.getInetAddress() + " received...");
// Server started and client connected
//Receiving data
Socket cliente2 = new Socket (cliente.getInetAddress(),puerto_servidor); // Creating socket for client, so we can send data there after this
BufferedReader lector = new BufferedReader (new InputStreamReader (cliente2.getInputStream()));
String operacion = new String("");
operacion = lector.readLine(); //Copy from the client to a string to decode afterwards
System.out.println("Received string \"" + operacion + ".");
//Data received
//Preparing data
String[] datos;
datos = operacion.split(";"); //En 'datos' (0,1,2) se guardan separados los valores que se recibieron
capital = Integer.parseInt(datos[0]);
interes = Integer.parseInt(datos[1]);
plazos = Integer.parseInt(datos[2]);
System.out.println("String was cut to 3 pieces: \"" + capital + "\", \"" + interes + "\" y \"" + plazos + "\".");
int resultado = capital*interes*plazos;
//Data prepared
// Se devuelve el resultado al cliente
PrintWriter way_back = new PrintWriter(cliente.getOutputStream(),true);
way_back.println("Result is: " + resultado);
System.out.println("Result was returned");
// Se ha devuelto el resultado
// End
}
catch (IOException Err){
System.out.println("Error");
System.out.println(Err.getMessage());
}
(两个代码都在 main 函数中)另外,我知道服务器代码中的 System.out.println(...) 只显示在服务器中,客户端也是如此。我只是这样做,以便我可以看到应用程序的进度:)
我希望你能帮助我。我知道有一个错误(嗯......超过 1 个哈哈)但我不确定在哪里,有 2 个单独的项目/应用程序意味着 2 个共享行的代码,我必须混合一些功能或其他什么,并且一个星期左右,老师将无法帮助我。我可以等待,但我真的希望它能够发挥作用,只是为了让您感到有成就感,正如您可能理解的那样。
我不是要一个工作代码,而是一些指导,这样我就可以自己修复代码,就像我在课堂上所做的那样。
再见!