服务器似乎没有收到应从客户端发送的消息。据我了解,客户端正在写入套接字输出流。服务器正在从套接字输入流中读取。请帮忙。
服务器代码:
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
public class TCPServer {
static final int DEFAULT_PORTNUMBER = 1236;
public static void main(String[] args){
int portnumber;
if(args.length >= 1){
portnumber = Integer.parseInt(args[0]);
}else{
portnumber = DEFAULT_PORTNUMBER;
}
//Setting a server socket and a possible client socket
ServerSocket server = null;
Socket client;
try{
server = new ServerSocket(portnumber);
} catch (IOException e){
e.printStackTrace();
}
while(true){
try{
System.out.println("Waiting for client...");
client = server.accept();
System.out.println("Client accepted... ");
//Read data form the client
BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream()));
while(!br.ready()){
System.out.println("No message from client");
}
String msgFromClient = br.readLine();
//System.out.println("Message received from client = " + msgFromClient);
//Send Response
if(msgFromClient != null && !msgFromClient.equalsIgnoreCase("bye")){
OutputStream clientOut = client.getOutputStream();
PrintWriter pw = new PrintWriter(clientOut, true);
String ansMsg = "Hello, " + msgFromClient;
pw.println(ansMsg);
}
if(msgFromClient != null && msgFromClient.equalsIgnoreCase("Bye")){
server.close();
client.close();
break;
}
} catch(IOException e) {
e.printStackTrace();
}
//New thread for client
/*new ServerThread(client).start();
System.out.println("Client connection accepted... ");*/
}
}
}
客户代码:
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
public class TCPClient {
static final int DEFAULT_PORTNUMBER = 1236;
public static void main(String args[]){
Socket client = null;
int portnumber;
//Default port number if not specified as an argument
if(args.length >= 1){
portnumber = Integer.parseInt(args[0]);
}else{
portnumber = DEFAULT_PORTNUMBER;
}
try {
String msg = "";
//Creating a client socket
client = new Socket(InetAddress.getLocalHost(), portnumber);
System.out.println("Client socket is created: " + client);
//Creating an output stream for the client socket
OutputStream clientOUt = client.getOutputStream();
PrintWriter pw = new PrintWriter(clientOUt, true);
//Creating an input stream for the client socket
InputStream clientIn = client.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(clientIn));
//Creating a buffered reader for standard input System.in
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter your name. Type Bye to exit.");
//Read data from standard input and write to output stream
msg = stdIn.readLine().trim();
pw.print(msg);
while(!br.ready()){
//System.out.println("No Input From Server");
}
//Read data from input stream of client socket
System.out.println("Message returned from the server = " + br.readLine());
pw.close();
br.close();
client.close();
//Stop operation
if (msg.equalsIgnoreCase("Bye")) {
System.exit(0);
} else {
}
} catch (IOException e) {
System.out.println("I/O error " + e);
}
}
}
注意:我确实禁用了防火墙,但这没有帮助。
答案 0 :(得分:0)
找到答案PrintWriter or any other output stream in Java do not know "\r\n"。它描述了printwriter如何无法正确地使用printwriter.print()进行刷新,而是仅在使用printwriter.println()时才起作用。