The client input letters are sent to the server, and the server (the server adopts multi-threaded or single-threaded) receives it and displays it on the console, and converts the data to uppercase and returns it to the client until the client inputs over and the conversion ends.
Client
/**
* 客户端程序
*
* @author Wxl
*
*/
public class TCPClient {
public static void main(String[] args) {
try {
Socket socket = new Socket("127.0.0.1", 2333);
System.out.println("连接成功服务端成功");
System.out.println("请输入一个小写字母,服务器将转化为大写");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
PrintWriter pw = new PrintWriter(socket.getOutputStream(),true);
BufferedReader br2 = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String str1 = null;
while ((str1 = br.readLine())!=null) {
if (str1.equals("over")) {
break;
}
pw.println(str1);
pw.flush();
System.out.println("转换为大写-->"+br2.readLine());
}
// br2.close();
// br.close();
socket.close();
System.out.println("连接结束!!!");
} catch (IOException e) {
e.printStackTrace();
}
}
}
Server
/**
* 服务端程序
*
* @author Wxl
*
*/
public class TCPServer {
public static void main(String[] args) {
try {
ServerSocket ss = new ServerSocket(2333);
System.out.println("服务端开始监听... ");
System.out.println("连接成功,服务器开始接受数据");
Socket socket = ss.accept();
BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter pw = new PrintWriter(socket.getOutputStream(),true);
String data = null;
while ((data=br.readLine())!=null) {
System.out.println("已接收到数据-->" + data);
pw.println(data.toUpperCase());
}
socket.close();
ss.close();
System.out.println("本次连接结束!!!");
} catch (IOException e) {
e.printStackTrace();
}
}
}
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