我正在用Java创建一个服务器/客户端应用程序，但它并没有按照我想要的方式运行。
我建立了连接，一切都很顺利但是它什么也没做。我认为它不会接受我的客户。
这是我的代码。
网络线程：
package libgdx.server;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.*;
public class NetworkingThread extends Thread {
private Socket sock= null;
private int ID;
public NetworkingThread(Socket sock){
super("Multiple connection thread!");
this.sock = sock;
}
@Override
public void run() {
try{
System.out.println("In the Method run() in the thread!");
PrintWriter out = new PrintWriter(sock.getOutputStream(),true);
BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
String inputLine,outputLine;
AlphaProtocol alpha = new AlphaProtocol();
outputLine = alpha.ProcessInput(null);
out.println(outputLine);
out.println("Welcome to the Server! Hope you enjoy your stay.");
while ((inputLine = in.readLine()) != null){
outputLine = alpha.ProcessInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye!")){
break;
}
}
out.close();
in.close();
sock.close();
}catch(IOException ioe){
ioe.printStackTrace();
System.err.println("Error in the Tread of Connecting and Method Run()");
}
}
}
这是服务器上用于接受客户并处理它们的步骤：）
服务器上的主类：
package libgdx.server;
import java.io.IOException;
import java.net.ServerSocket;
/**
*
* @author Saturn
*/
public class MainServer {
private static ServerSocket Server = null;
private static boolean networking = true;
public static void main(String[] args) throws IOException{
try{
System.out.println("Server listening!");
Server = new ServerSocket(4444);
}catch (IOException io){
System.err.println("Error while making ServerSocket!");
System.exit(-1);
}
while (networking)
System.out.println("Networking!");
new NetworkingThread(Server.accept()).start();
}
}
服务器协议：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package libgdx.server;
import java.util.Calendar;
import java.util.Date;
/**
*
* @author Saturn
*/
public class AlphaProtocol {
private static final int CONNECTING = -1;
private static final int MOVE = 0;
private static final int NEW_PLAYER = 1;
private int state = CONNECTING;
private Calendar Date;
private Date Time = Date.getTime();
public String ProcessInput(String input){
String output = null;
String name = null;
String X= null,Y = null;
if (input.equals("connect")){
System.out.println("Connection granted!");
output = Time + ":" + "Got a Connection over here!";
}
if (input.equals("Bye!")){
System.err.println("Client said Bye!");
}
return output;
}
}
现在这些是客户端文件：
桌面：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package libgdx.test;
import com.badlogic.gdx.backends.jogl.JoglApplication;
/**
*
* @author Saturn
*/
public class Desktop {
public static void main(String[] args) {
// TODO code application logic here
new JoglApplication(new LibGDXTest(),"Test #1",640,480,false);
}
}
LibGDXTest：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package libgdx.test;
import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.backends.jogl.JoglApplication;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Vector2;
import java.util.Scanner;
/**
*
* @author Saturn
*/
public class LibGDXTest implements ApplicationListener {
SpriteBatch spriteBatch;
Texture texture;
BitmapFont font;
Vector2 textPosition = new Vector2(100, 100);
Vector2 textDirection = new Vector2(1, 1);
String ip;
int port;
Networking net = new Networking();
/**
* @param args the command line arguments
*/
@Override
public void create() {
Scanner in = new Scanner(System.in);
System.out.println("Hello, welcome to LibGDX Network test: #1 ");
System.out.println("Type the server ip in:");
ip = in.next();
System.out.println("Type the server port in:");
port = in.nextInt();
System.out.println("IP:" + ip + "Port:" + port);
net.Connect(ip,port);
}
@Override
public void resize(int i, int i1) {
}
@Override
public void render() {
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void dispose() {
}
}
网络：是在客户端处理所有网络的类：）
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package libgdx.test;
/**
*
* @author Saturn
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Networking {
private Socket Client;
private PrintWriter out;
private BufferedReader in;
public void Connect(String arg1, int arg2){
try{
Client = new Socket(arg1,arg2);
out = new PrintWriter(Client.getOutputStream(),true);
in = new BufferedReader(new InputStreamReader(Client.getInputStream()));
}catch(UnknownHostException uhk) {
System.err.println("Cannot find host:" + arg1);
System.exit(-1);
}catch (IOException ioe) {
System.err.println("Cannot get I/O for the connection:" + arg1);
System.exit(-1);
}
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
String fromUser;
String fromServer;
try {
while ((fromServer = in.readLine()) != null) {
System.out.println("Server: " + fromServer);
if (fromServer.equals("Bye!"))
break;
fromUser = stdIn.readLine();
if (fromUser != null) {
System.out.println("Client: " + fromUser);
out.println(fromUser);
}
}
} catch (IOException ex) {
Logger.getLogger(Networking.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
当我运行应用程序时，
我明白了：
Client: Hello, welcome to LibGDX Network test: #1
Type the server ip in:
127.0.0.1 // My INPUT!
Type the server port in:
4444 // My INPUT!
IP:127.0.0.1Port:4444
服务器：
Server listening!
Networking!
Networking!
Networking!
Networking!
Networking!
Networking!
Networking!
它只是打印“网络！”。
任何帮助将不胜感激！
答案 0 :(得分：1)
你的程序中有一个错误，如果你使用调试器就会很明显。你写过
while (networking)
System.out.println("Networking!");
由于networking始终为真，因此无休止地运行。我建议使用IDE格式化，并为您的循环放置{和}，直到您确信不需要它们为止。
答案 1 :(得分：0)
请注意，在您的NetworkingThread类package libgdx.server;中，您正在调用类AlphaProtocol的outputLine = alpha.ProcessInput(null);，但由于您提供null作为参数，因此该函数将返回方法中定义的null。由于Variable input 为null，且没有条件满足true，因此输出始终保持为null，这是从此方法返回的。
public String ProcessInput(String input){
String output = null;
String name = null;
String X= null,Y = null;
if (input.equals("connect")){
System.out.println("Connection granted!");
output = Time + ":" + "Got a Connection over here!";
}
if (input.equals("Bye!")){
System.err.println("Client said Bye!");
}
return output;
}
所以在客户端的网络类中接收到该空值时，在此代码中while ((fromServer = in.readLine()) != null) , the Client shuts itself down.
So please try to provide some String value in place of null here, outputLine = alpha.ProcessInput（“Hello Client”）;`
我想这是你应该努力使事情发挥作用的问题。
Regards`