Java Socket为什么服务器无法回复客户端 [英] Java Socket why server can not reply client
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问题描述
我想编写代码,让客户端将字符串发送到服务器,服务器打印该字符串并回复一个字符串,然后客户端打印该字符串服务器回复.
我的服务器
I wanna write the code to let Client send a string to Server, Server print the string and reply a string, then Client print the string Server reply.
My Server
public class Server {
public static void main(String[] args) throws IOException {
ServerSocket ss = null;
Socket s = null;
try {
ss = new ServerSocket(34000);
s = ss.accept();
BufferedReader in = new BufferedReader(new InputStreamReader(
s.getInputStream()));
OutputStreamWriter out = new OutputStreamWriter(s.getOutputStream());
while (true) {
String string = in.readLine();
if (string != null) {
System.out.println("br: " + string);
if (string.equals("end")) {
out.write("to end");
out.flush();
out.close();
System.out.println("end");
// break;
}
}
}
} catch (IOException e) {
e.printStackTrace();
} finally {
s.close();
ss.close();
}
}
}
我的客户:
public class Client {
public static void main(String[] args) {
Socket socket =null;
try {
socket = new Socket("localhost", 34000);
BufferedReader in =new BufferedReader(new InputStreamReader(socket.getInputStream()));
OutputStreamWriter out = new OutputStreamWriter(socket.getOutputStream());
String string = "";
string = "end";
out.write(string);
out.flush();
while(true){
String string2 = in.readLine();
if(string2.equals("to end")){
System.out.println("yes sir");
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
System.out.println("closed client");
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
有什么问题吗?如果我在客户端类中删除代码"while(true)...",就可以了.
are there some somethings wrong? if i remove the code "while(true) ..." in client class, it's OK.
推荐答案
您应该在写入流的String的末尾添加"\r\n"
.
you should add "\r\n"
at the end of the String which write into stream.
示例:
客户端:
string = "end";
out.write(string + "\r\n");
out.flush();
服务器:
out.write("to end" + "\r\n");
out.flush();
out.close();
System.out.println("end");
// break;
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