【網絡編程】

引言：

C/S 結構：全稱爲Client/Server結構，是指客戶端與服務器結構。常見程序：QQ、迅雷

B/S 結構 ：全稱爲Browser/Server結構，是指瀏覽器和服務器結構。常見：谷歌瀏覽器

 

 

 

 

•  客戶端與服務器的聊天

 

 

 client

package demo1;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TCPClient {
	public static void main(String[] args) throws Exception {
		Socket socket = new Socket("127.0.0.1",8888);
		OutputStream os = socket.getOutputStream();
		os.write("你好".getBytes());
		
		InputStream is = socket.getInputStream();
		byte[] bytes = new byte[1024];
		int len = is.read(bytes);
		System.out.println(new String(bytes,0,len));
		
		socket.close();
	}
}

 

 

 

server

package demo1;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPServer {
	public static void main(String[] args) throws Exception {
		ServerSocket server = new ServerSocket(8888);
		Socket socket = server.accept();
		InputStream is = socket.getInputStream();
		byte[] bytes = new byte[1024];
		int len = is.read(bytes);
		System.out.println(new String(bytes,0,len));
		OutputStream os = socket.getOutputStream();
		os.write("已收到".getBytes());
		socket.close();
		server.close();
	}
}

 

• 客戶端與服務器的文件傳輸

 

 

package demo1;

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TCPClient {
	public static void main(String[] args) throws Exception {
		FileInputStream fis = new FileInputStream("E:\\1.jpg");
		Socket socket = new Socket("127.0.0.1",8888);
		OutputStream os = socket.getOutputStream();

		int len = 0;
		byte[] bytes = new byte[1024];
		while((len = fis.read(bytes))!=-1){
			os.write(bytes,0,len);
		}

	   socket.shutdownOutput();   //結束傳輸，放置兩邊的read()阻塞

		InputStream is = socket.getInputStream();
		while((len = is.read(bytes))!=-1){
			System.out.println(new String(bytes,0,len));
		}
		
		fis.close();
		socket.close();
	}
}

 

package demo1;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPServer {
	public static void main(String[] args) throws Exception {
		ServerSocket server = new ServerSocket(8888);
		Socket socket = server.accept();
		
		InputStream is = socket.getInputStream();
		File file = new File("D:\\myUpLoad");
		if(!file.exists()){
			file.mkdirs();
		}
		
		FileOutputStream fos = new FileOutputStream(file+"\\1.jpg");  //注意這裏是區分父子目錄的關鍵
		int len = 0;
		byte[] bytes = new byte[1024];
		while((len = is.read(bytes))!=-1){
			fos.write(bytes,0,len);
		}

		socket.getOutputStream().write("上傳成功".getBytes());
		
		fos.close();
		socket.close();
		server.close();
	}
}