TCP问题

何伟超

package cn.itcast.net.TPC;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;
public class TransClient {
public static void main(String[] args) throws UnknownHostException, IOException {
Socket s=new Socket("127.0.0.1",10014);
BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bufw=new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
//PrintWriter out =new PrintWriter(s.getOutputStream(),true);
BufferedReader bufrin=new BufferedReader(new InputStreamReader(s.getInputStream()));
String line=null;
while ((line=bufr.readLine())!=null) {
if("over".equals(line))
break;
bufw.write(line);
String str=bufrin.readLine();
System.out.println("转换后"+str);
}
s.close();
}
}

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package cn.itcast.net.TPC;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class TransServer {
public static void main(String[] args) throws IOException {
ServerSocket ss=new ServerSocket(10014);
Socket s=ss.accept();
System.out.println(s.getInetAddress().getHostName());
BufferedReader bufIn=new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter out=new PrintWriter(s.getOutputStream(),true);
String line=null;
while ((line=bufIn.readLine())!=null) {
out.println(line.toUpperCase());
}
s.close();
ss.close();
}
}

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做了一个，TCP协议的服务器客户端，服务器只负责把输入的字母转换成大写，我这样写不能翻译，错在了哪？

╰つ · ╰つ

噢耶，总算把问题调出来了，好长时间没玩这个东西了，太坑了，原因是你没有使用flush把它刷到服务端去，所以服务端读取不到你的数据，所以你的客户端也不会收到数据，修正代码如下：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;
public class stock {
public static void main(String[] args) throws UnknownHostException, IOException {
Socket s=new Socket("127.0.0.1",10014);
BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bufw=new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
//PrintWriter out =new PrintWriter(s.getOutputStream(),true);
BufferedReader bufrin=new BufferedReader(new InputStreamReader(s.getInputStream()));
String line=null;
StringBuffer sb=new StringBuffer();
while ((line=bufr.readLine())!=null) {
sb.append(line+"\n");
if("over".equals(line)){
System.out.println(123);
break;
}
}
bufw.write(sb.toString());
bufw.flush();
String str=bufrin.readLine();
System.out.println("xixixiixxiixixix");
System.out.println("转换后"+str);
s.close();
}
}

复制代码

package stock;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class server {
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
ServerSocket ss=new ServerSocket(10014);
Socket s=ss.accept();
System.out.println(s.getInetAddress().getHostName());
BufferedReader bufIn=new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter out=new PrintWriter(s.getOutputStream(),true);
String line=null;
while ((line=bufIn.readLine())!=null) {
out.println(line.toUpperCase());
}
out.close();
s.close();
ss.close();
}
}

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╰つ · ╰つ

不好意思，一些调试语句没有去，还有你的程序有一些小问题，你发现没你客户端只能读取一行，不知道你是这样设计的，还是另有原因

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