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java网络编程之图片上传

输入输出流核心代码

所有的文件传输都是靠流,其中文件复制最具代表性.输入流和输出流,从输入流中读取数据写入到输出流中。

InputStream in = 输入源;
OutputStream os = 输出目的;
byte[] bytes = new byte[1024]; int len = 0; while((len = in.read(bytes))!=-1){ //读取到文件末尾的话可以读到-1 os.write(bytes,0,len); }
os.close(); in.close();

TCP图片上传客户端

1.Socket套接字连接服务器,指定ip和端口

  Socket socket = Socket(String host, int port);

2.通过Socket获取字节输出流,向服务器写图片

  OutputStream os = socket.getOutputStream();

3.创建输入流对象,读取图片数据源

  FileInputStream fis = new FileInputStream(filePath);

4.读取图片,使用字节输出流,将图片写到服务器,采用字节数组进行缓冲

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

  socket.shutdownOutput();//文件读完时给服务器写终止序列

5.通过Socket套接字获取字节输入流,读取服务器发回来的上传成功

  InputStream inputStream = socket.getInputStream();
  len = inputStream.read(bytes);
  System.out.println(“服务器返回:”+new String(bytes,0,len));

6.关闭资源

  socket.close();

/**
 * 实现TCP图片上传客户端
 * 实现步骤:
 *      1.Socket套接字连接服务器,指定ip和端口
 *          Socket socket = Socket(String host, int port);
 *      2.通过Socket获取字节输出流,写图片
 *          OutputStream os = socket.getOutputStream();
 *      3.使用自己的流对象,读取图片数据源
 *          FileInputStream fis = new FileInputStream(filePath);
 *      4.读取图片,使用字节输出流,将图片写到服务器,采用字节数组进行缓冲
 *           int len = 0;
 *           byte[] bytes = new byte[1024];
 *           while ((len = fis.read(bytes)) != -1){
 *              os.write(bytes,0,len);
 *           }
 *      5.通过Socket套接字获取字节输入流,读取服务器发回来的上传成功
 *          InputStream inputStream = socket.getInputStream();
 *          len = inputStream.read(bytes);
 *          System.out.println("服务器返回:"+new String(bytes,0,len));
 *      6.关闭资源
 *          socket.close();
 *
 *      Created by Autumn on 2018/2/5.
 */
public class TCPClient {
    public static void main(String[] args) throws IOException {
        String ip = "127.0.0.1";
        int port = 8000;
        File fileFolder = new File("D:\\Users\\Autumn\\Pictures");

        uploadPic(ip,port,fileFolder+File.separator+"tiger.jpg");
        uploadPic(ip,port,fileFolder+File.separator+"water.jpg");
        uploadPic(ip,port,fileFolder+File.separator+"sunset.jpg");
    }

    /**
     * 上传图片
     * @param ip  服务器ip地址
     * @param port   服务器端口号
     * @param filePath   文件路径
     * @throws IOException
     */
    public static void uploadPic(String ip,int port,String filePath) throws IOException{
        //创建客户端Socket
        Socket socket = new Socket(ip,port);
        //根据Socket获取字节输出流,用此流将图片写到服务器
        OutputStream os = socket.getOutputStream();

        //创建字节输入流,读取本机上的数据源图片
        FileInputStream fis = new FileInputStream(filePath);

        //开始读写字节数组,从输入流中读取到输出流
        int len = 0;
        byte[] bytes = new byte[1024];
        while ((len = fis.read(bytes)) != -1){
            os.write(bytes,0,len);
        }

        //文件读完时给服务器写终止序列
        socket.shutdownOutput();

        //获取字节输入流,读取服务器的上传成功
        InputStream inputStream = socket.getInputStream();
        len = inputStream.read(bytes);
        System.out.println("服务器返回:"+new String(bytes,0,len));

        socket.close();
    }
}

TCP图片上传服务器端

1.ServerSocket套接字对象,监听8000

  ServerSocket serverSocket = ServerSocket(int port);

2.方法accept()获取客户端的连接对象

  Socket socket = serverSocket.accept();

3.客户端连接对象获取字节输入流,读取客户端发送图片

  InputStream in = socket.getInputStream();

4.创建File对象,绑定上传文件夹。判断文件夹存在,不存在则创建文件夹

  File upload = new File(“d:\\upload”);
  if (!upload.exists()){
    upload.mkdirs();
  }

5.创建字节输出流,数据目的File对象所在文件夹

  String fileName = “pic”+System.currentTimeMillis()+ new Random().nextInt(9999)+”.jpg”;
  FileOutputStream fos = new FileOutputStream(upload+File.separator+fileName);

6.字节流读取图片,字节流将图片写入到目的文件中

  byte[] bytes = new byte[1024];
  int len = 0;
  while((len = in.read(bytes))!=-1){     //读的是客户端发过来图片的字节数组,只有读文件能读到-1,所以这里永远读不到-1,read()会一直阻塞。(需要客户端发送结束标志)
    fos.write(bytes,0,len);
  }

7.将上传成功回写给客户端
  socket.getOutputStream().write((“上传到服务器”+socket.getLocalAddress().toString()+”成功”).getBytes());

8.关闭资源

  fos.close();
  socket.close();

/**
 * 多线程接收图片
 * Created by Autumn on 2018/2/5.
 */
public class TCPThreadServer {
    public static void main(String[] args) throws IOException {
        //服务端不用指定ip地址,只需指定端口号
        ServerSocket serverSocket = new ServerSocket(8000);
        while(true){
            //获得一个客户端Socket对象,开启一个线程
            Socket socket = serverSocket.accept();   //线程阻塞
            new Thread(new Upload(socket)).start();
        }
    }
}

/**
 * TCP图片上传服务器
 *  1.ServerSocket套接字对象,监听8000
 *      ServerSocket serverSocket = ServerSocket(int port);
 *  2.方法accept()获取客户端的连接对象
 *      Socket socket = serverSocket.accept();
 *  3.客户端连接对象获取字节输入流,读取客户端发送图片
 *      InputStream in = socket.getInputStream();
 *  4.创建File对象,绑定上传文件夹。判断文件夹存在,不存在则创建文件夹
 *      File upload = new File("d:\\upload");
 *      if (!upload.exists()){
 *         upload.mkdirs();
 *      }
 *  5.创建字节输出流,数据目的File对象所在文件夹
 *      String fileName = "pic"+System.currentTimeMillis()+ new Random().nextInt(9999)+".jpg";
 *      FileOutputStream fos = new FileOutputStream(upload+File.separator+fileName);
 *  6.字节流读取图片,字节流将图片写入到目的文件中
 *      byte[] bytes = new byte[1024];
 *      int len = 0;
 *      while((len = in.read(bytes))!=-1){    //读的是客户端发过来图片的字节数组,只有读文件能读到1,所以永远读不到-1
 *          fos.write(bytes,0,len);
 *      }
 *  7.将上传成功回写给客户端
 *      socket.getOutputStream().write(("上传到服务器"+socket.getLocalAddress().toString()+"成功").getBytes());
 *  8.关闭资源
 *      fos.close();
 *      socket.close();
 *  Created by Autumn on 2018/2/5.
 */
public class Upload implements Runnable {
    private Socket socket;

    public Upload(Socket socket){
        this.socket = socket;
    }
    @Override
    public void run() {
        try {
            //获取输入流
            InputStream in = socket.getInputStream();
            //创建文件夹
            File upload = new File("d:\\upload");
            if (!upload.exists()){
                upload.mkdirs();
            }
            String fileName = "pic"+System.currentTimeMillis()+ new Random().nextInt(9999)+".jpg";
            //创建字节输出流,将图片写入到目的文件夹       upload:d://upload
            FileOutputStream fos = new FileOutputStream(upload+File.separator+fileName);
            //读写字节数组
            byte[] bytes = new byte[1024];
            int len = 0;
            while((len = in.read(bytes))!=-1){    //读的是客户端发过来图片的字节数组,只有读文件能读到1,所以永远读不到-1
                fos.write(bytes,0,len);
            }
            System.out.println("成功接收来自"+socket.getInetAddress()+socket.getPort()+"的图片!");
            //通过客户端连接对象获取字节输出流
            //上传成功写会客户端
            socket.getOutputStream().write(("上传到服务器"+socket.getLocalAddress().toString()+"成功").getBytes());
            fos.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

  code

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