以下のコードは、ユーザーが URL を入力し、その Web サイトの IP アドレスを返せるようにする必要がありますが、機能していません。
アプリケーションはコンソール アプリケーションです。かつては機能していましたが、なぜ今は機能しないのかわかりません。
ユーザーがWebサイトにアクセスしてIPアドレスを取得するときに発生するエラーは次のとおりです
IOException: java.net.SocketException: Connection reset
これが私のクライアントコードです
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
public class Client {
public static void main(String[] args) {
String hostname = "localhost";
int port = 6052;
if (args.length > 0) {
hostname = args[0];
}
Socket clientSocket = null;
PrintWriter os = null;
BufferedReader is = null;
try {
clientSocket = new Socket(hostname, port);
os = new PrintWriter(clientSocket.getOutputStream(), true);
is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: " + hostname);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: " + hostname);
}
if (clientSocket == null || os == null || is == null) {
System.err.println("Something is really wrong. ");
return;
}
try {
if (args.length != 2) {
System.out.print("Enter a www web address (must have www!) ");
BufferedReader br = new BufferedReader(new InputSreamReader(Sy.in))
String keyboardInput = br.readLine();
os.println(keyboardInput);
} else {
os.println(args[1]);
}
String responseLine = is.readLine();
System.out.println("The IP address of " + args[1] + "is" + responseLine);
} catch (UnknownHostException e) {
System.err.println("Trying to connect to host: " + e);
} catch (IOException e) {
System.err.println("IOException: " + e);
}
}
}
これが私のサーバーコードです
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
public static void main(String args[]) {
int port = 6052;
Server server = new Server(port);
server.startServer();
}
ServerSocket echoServer = null;
Socket clientSocket = null;
int numConnections = 0;
int port;
public Server(int port) {
this.port = port;
}
public void stopServer() {
System.out.println("Server working hold on a min.");
System.exit(0);
}
public void startServer() {
try {
echoServer = new ServerSocket(port);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Server is now started and is waiting for Clients.");
while (true) {
try {
clientSocket = echoServer.accept();
numConnections++;
new Thread(new ServerConnection(clientSocket, numConnections,
this)).start();
} catch (IOException e) {
System.out.println(e);
}
}
}
}
class ServerConnection implements Runnable {
private static BufferedReader is;
private static PrintStream os;
private static Socket clientSocket;
private static int id;
private static Server server;
public ServerConnection(Socket clientSocket, int id, Server server) {
this.clientSocket = clientSocket;
this.id = id;
this.server = server;
System.out.println( "Connection " + id + " established with: " + clientSocket );
try {
is = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
os = new PrintStream(clientSocket.getOutputStream());
} catch (IOException e) {
System.out.println(e);
}
}
public void run() {
String line;
try {
boolean serverStop = false;
line = is.readLine();
System.out.println( "Received " + line + " from Connection " + id + "." );
InetAddress hostAddress = InetAddress.getByName(line);
String IPaddress = hostAddress.getHostAddress();
os.println(IPaddress);
is.close();
os.close();
clientSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}