Java socket笔记
- 概述
socket是基于应用服务与TCP/IP通信之间的一个抽象，他将TCP/IP协议里面复杂的通信逻辑进行分装，对用户来说，只要通过一组简单的API就可以实现网络的连接。
- socket基本示例(single thread)
服务端
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class ServerSocketTest {
public static void main(String[] args) {
try {
// 初始化服务端socket并且绑定9999端口
ServerSocket serverSocket =new ServerSocket(9999);
//等待客户端的连接
Socket socket = serverSocket.accept();
//获取输入流
BufferedReader bufferedReader =new BufferedReader(new InputStreamReader(socket.getInputStream()));
//读取一行数据
String str = bufferedReader.readLine();
//输出打印
System.out.println(str);
}catch (IOException e) {
e.printStackTrace();
}
}
}
客户端：
public static void main(String[] args) {
try {
Socket socket =new Socket("127.0.0.1",9999);
BufferedWriter bufferedWriter =new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
String str="你好，这是我的第一个socket";
bufferedWriter.write(str);
//刷新输入流
bufferedWriter.flush();
//关闭socket的输出流
socket.shutdownOutput();
}catch (IOException e) {
e.printStackTrace();
}
}
- socket基本示例（multi-thread）
public static void main(String[] args)throws IOException {
// 初始化服务端socket并且绑定9999端口
ServerSocket serverSocket =new ServerSocket(9999);
//创建一个线程池
ExecutorService executorService = Executors.newFixedThreadPool(100);
while (true) {
//等待客户端的连接
Socket socket = serverSocket.accept();
Runnable runnable = () -> {
BufferedReader bufferedReader =null;
try {
bufferedReader =new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF-8"));
//读取一行数据
String str;
//通过while循环不断读取信息，
while ((str = bufferedReader.readLine()) !=null) {
//输出打印
System.out.println("客户端说：" + str);
}
}catch (IOException e) {
e.printStackTrace();
}
};
executorService.submit(runnable);
}
}
客户端：
public static void main(String[] args) {
try {
//初始化一个socket
Socket socket =new Socket("127.0.0.1",9999);
//通过socket获取字符流
BufferedWriter bufferedWriter =new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
//通过标准输入流获取字符流
BufferedReader bufferedReader =new BufferedReader(new InputStreamReader(System.in,"UTF-8"));
while (true){
String str = bufferedReader.readLine();
bufferedWriter.write(str);
bufferedWriter.write("\n");
bufferedWriter.flush();
}
}catch (IOException e) {
e.printStackTrace();
}
}
}
