[英]Java Client/Server don't communicate through Socket/ServerSocket
[英]Client server don't communicate
當我運行服務器時,我有客戶端服務器應用程序,我從服務器類中獲取了打印的內容,但是當我運行客戶端類時,即使建立了連接也沒有任何反應,但是客戶端類似乎沒有從服務器接收任何消息
這是我的服務器代碼
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
ServerSocket provider;
Socket clientsocket;
OutputStream out;
InputStream in;
InetAddress clientAddress;
StringBuilder sb;
BufferedReader br;
String msg="";
Server(){
}
public void Communicate()
{
try {
provider=new ServerSocket(2013);
System.out.println("Server Waiting for connections");
clientsocket=provider.accept();
System.out.println("incoming connection from ");
clientAddress=clientsocket.getInetAddress();
//System.out.println("Client Name"+clientAddress.getHostName());
System.out.println("Client Address "+clientAddress.getHostAddress());
out=clientsocket.getOutputStream();
in=clientsocket.getInputStream();
sendmsg("connection success");
do
{
msg=read_instream(in);
System.out.println("client say"+msg);
if(msg.equals("bye"))
{
sendmsg(msg);
clientsocket.close();
in.close();
out.close();
}
}
while(!msg.equals("bye"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void sendmsg(String msg) throws IOException
{
out.write(msg.getBytes());
out.flush();
}
private String read_instream(InputStream in) throws IOException
{
br=new BufferedReader(new InputStreamReader(in));
sb=new StringBuilder();
while (br.readLine()!=null)
sb.append(br.readLine());
return sb.toString();
}
public static void main(String[] args){
Server provider=new Server();
while(true)
provider.Communicate();
}
}
和客戶端代碼
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
public class Client {
Socket client;
String msg="give me the last degree";
OutputStream out;
InputStream in;
StringBuilder sb;
BufferedReader br;
public void Communicate()
{
try {
client=new Socket("localhost",2013);
out=client.getOutputStream();
in=client.getInputStream();
System.out.println("Messege from server:"+read_instream(in));
while (!msg.equals("bye"))
{
msg=read_instream(in);
System.out.println("server say"+msg);
sendmsg("hey from client");
msg="bye";
sendmsg(msg);
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private String read_instream(InputStream in) throws IOException
{
br=new BufferedReader(new InputStreamReader(in));
sb=new StringBuilder();
while (br.readLine()!=null)
sb.append(br.readLine());
return sb.toString();
}
private void sendmsg(String msg) throws IOException
{
out.write(msg.getBytes());
out.flush();
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Client requester=new Client();
requester.Communicate();
}
}
您的read_instream方法將阻塞,直到流關閉。 br.readline()在“到達流的末尾”之前不會返回null(請參閱javadoc )。 您的服務器類發送一條消息,將其刷新,但永不結束流。
編輯:發生了什么仍然是一個阻塞的問題。 您的服務器僅在接收到來自客戶端的消息后,才關閉到客戶端的輸出流。 但是,服務器上的read_instream()方法等待客戶端關閉流。 客戶端永遠不會關閉它,因為它首先仍然在等待服務器關閉。 因此,一種選擇是在sendmsg()方法中關閉輸出流。 但是,這將不允許發送任何其他消息。 您還可以將read_instream()方法更改為在每一行之后返回,而不要等待流的結尾。
閱讀Oracle文檔中的客戶端/服務器教程。 他們使用第二個選項在服務器和客戶端之間進行長時間的對話:不要在read_instream()方法中等待流結束。 在本教程的最后,他們將簡要介紹如何支持多個客戶端。
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