文件上传原理

文件上传原理

文件上传客户端

文件上传客户端

package com.mujiachao.tcp;

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

public class WenJianShangChuanClient {
    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("F:\\电影\\111\\kk.jfif");
        Socket socket = new Socket("127.0.0.1",8888);
        OutputStream outputStream = socket.getOutputStream();
        InputStream inputStream = socket.getInputStream();
        int len=0;
        byte[] bytes=new byte[1024];
        while ((len=fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
        }
        socket.shutdownOutput();
        while ((len=inputStream.read(bytes))!=-1){
            System.out.println(new String(bytes,0,len));
        }
        fileInputStream.close();
        socket.close();
    }
}

文件上传服务器

文件上传服务器

package com.mujiachao.tcp;

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

public class WenJianShangChuanServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8888);
        Socket accept = serverSocket.accept();
        InputStream inputStream = accept.getInputStream();
        File file = new File("F:\\电影\\111\\upload");
        if (!file.exists()){
            file.mkdirs();
        }
        FileOutputStream fileOutputStream = new FileOutputStream(file + "\\99.png");
        int len=0;
        byte[] bytes=new byte[1024];
        while ((len=inputStream.read(bytes))!=-1){
            fileOutputStream.write(bytes,0,len);
        }
        accept.getOutputStream().write("上传成功".getBytes());
        fileOutputStream.close();
        accept.close();
        serverSocket.close();

    }
}

文件上传案例阻塞问题 解决方案： socket.shutdownOutput();

文件上传案例阻塞问题

文件上传案例优化（循环接收，文件命名，多线程）

package com.mujiachao.tcp;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Random;
import java.util.concurrent.ExecutorService;

import static java.util.concurrent.Executors.newFixedThreadPool;

public class WenJianShangChuanServerYouHua {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(8888);
        while (true){
            Socket accept = serverSocket.accept();
            ExecutorService executorService = newFixedThreadPool(10);
            executorService.submit(new Thread(){
                @Override
                public void run() {
                    try(  InputStream   inputStream = accept.getInputStream()) {
                        File file = new File("F:\\电影\\111\\upload");
                        if (!file.exists()){
                            file.mkdirs();
                        }
                        String fiLName="\\mu"+System.currentTimeMillis()+ new Random().nextInt(999999)+".png";
                        FileOutputStream fileOutputStream = new FileOutputStream(file + fiLName);
                        int len=0;
                        byte[] bytes=new byte[1024];
                        while ((len=inputStream.read(bytes))!=-1){
                            fileOutputStream.write(bytes,0,len);
                        }
                        accept.getOutputStream().write("上传成功".getBytes());
                        fileOutputStream.close();
                        accept.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }
}

package com.mujiachao.tcp;

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

public class WenJianShangChuanClientYouHua {
    public static void main(String[] args) throws IOException {
        FileInputStream fileInputStream = new FileInputStream("F:\\电影\\111\\kk.jfif");
        Socket socket = new Socket("127.0.0.1",8888);
        OutputStream outputStream = socket.getOutputStream();
        InputStream inputStream = socket.getInputStream();
        int len=0;
        byte[] bytes=new byte[1024];
        while ((len=fileInputStream.read(bytes))!=-1){
            outputStream.write(bytes,0,len);
        }
        socket.shutdownOutput();
        while ((len=inputStream.read(bytes))!=-1){
            System.out.println(new String(bytes,0,len));
        }
        fileInputStream.close();
        socket.close();
    }
}