2.4建立网络通信

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import java.net.*;

public class MyServer {
    public static void main(String[] args){
        try {
            ServerSocket ss = new ServerSocket(8000);
            
            System.out.println("监听前.......");
            Socket s = ss.accept();
            System.out.println("监听后.......");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

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import java.net.*;

public class MyClient {
    public static void main(String[] agrs){
        try {
            Socket s = new Socket("127.0.0.1", 8000);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

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import java.net.*;

public class MyServer {
    public static void main(String[] args){
        try {
            ServerSocket ss = new ServerSocket(8000);
            
            System.out.println("监听前.......");
            Socket s = ss.accept();
            System.out.println(s.getInputStream().read());
            System.out.println("监听后.......");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

我们用s来得到输入流，然后用这个输入流读。到这里，客户端代码你应该琢磨着就能写出来了。

import java.net.*;

public class MyClient {
    public static void main(String[] agrs){
        try {
            Socket s = new Socket("127.0.0.1", 8000);
            s.getOutputStream().write(100);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

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import java.net.*;
import java.io.*;

public class MyServer {
    public static void main(String[] args){
        try {
            ServerSocket ss = new ServerSocket(8000);
            
            System.out.println("监听前.......");
            Socket s = ss.accept();
            
            InputStream is = s.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            
            System.out.println(br.readLine());
            System.out.println("监听后.......");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

我们得到了字节流，然后转换成字符流，最后得到能够读一行数据的高级流。下面的客户端代码你最好先自己试着写一下，然后再看我的。

import java.net.*;
import java.io.*;

public class MyClient {
    public static void main(String[] agrs){
        try {
            Socket s = new Socket("127.0.0.1", 8000);
            OutputStream os = s.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            PrintWriter pw = new PrintWriter(osw);
            pw.println("王洋");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

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import java.net.*;
import java.io.*;

public class MyClient {
    public static void main(String[] agrs){
        try {
            Socket s = new Socket("127.0.0.1", 8000);
            OutputStream os = s.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            PrintWriter pw = new PrintWriter(osw,true);
            pw.println("Java学习。");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

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import java.net.*;
import java.io.*;

public class MyServer {
    public static void main(String[] args){
        try {
            ServerSocket ss = new ServerSocket(8000);
            
            System.out.println("监听前.......");
            Socket s = ss.accept();
            
            InputStream is = s.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            
            String name = br.readLine();
            System.out.println(name);
            
            OutputStream os = s.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            PrintWriter pw = new PrintWriter(osw, true);
            
            pw.println("欢迎"+name);
            
            System.out.println("监听后.......");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}

import java.net.*;
import java.io.*;

public class MyClient {
    public static void main(String[] agrs){
        try {
            Socket s = new Socket("127.0.0.1", 8000);
            OutputStream os = s.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            PrintWriter pw = new PrintWriter(osw,true);
            pw.println("王洋");
            
            InputStream is = s.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            
            String mess = br.readLine();
            System.out.println(mess);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
}