package demo04;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.Socket;public class TCPclient {    public static void main(String[] args) throws IOException {        //1.创建socket对象，连接服务器        Socket s =new Socket("127.0.0.1", 8765);        //2.通过套接字获取输出流        OutputStream out =s.getOutputStream();        //3.获取数据源        FileInputStream fis =new FileInputStream("D:\\test\\aaa.png");        //4.读数据        int len =0;        byte [] b =new byte [1024];        while((len =fis.read(b))!=-1){            //写入目的地            out.write(b,0,len);        }        s.shutdownOutput();        //接受服务器回复        InputStream in =s.getInputStream();        len =in.read(b);        System.out.println(new String(b ,0,len));        //释放资源        fis.close();        s.close();    }}

package demo04;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;import java.util.Random;import org.xml.sax.InputSource;public class TCPserver{    public static void main(String[] args) throws IOException {        //1.创建服务器套接字绑定接口        ServerSocket ser =new ServerSocket(8765);        //2.接受套接字对象        Socket s =ser.accept();        //3.获取输入流        InputStream in =s.getInputStream();        //4.获取文件夹，如果不存在就创建        File f =new File("f:\\aaa");        if(!f.exists()){            f.mkdirs();        }        //5.创建文件输出流        String filename ="oracle"+System.currentTimeMillis()+new Random().nextInt(99999)+".png";        FileOutputStream fos =new FileOutputStream(f+File.separator+filename);        //6.写入数据        byte  [] b =new byte [1024];        int len =0;        while((len =in.read(b))!=-1){            fos.write(b,0,len);        }        //服务器给客服端回复（上传成功）        OutputStream out=s.getOutputStream();        out.write("上传成功".getBytes());        //释放资源        fos.close();        s.close();        ser.close();    }    }