java网络编程_文件上传

服务端

public class FileUploadServer {
    public static void main(String[] args) throws IOException {
        ServerSocket server = new ServerSocket(8888);
        Socket socket = server.accept();
        InputStream is = socket.getInputStream();
        // 文件夹是否存在，不存在就创建
        File file = new File("G:\\test\\demo\\test\\text\\tt\\upload");
        if(!file.exists()){
            file.mkdirs();
        }
        // 创建一个服务器端的输出流对象
        FileOutputStream fos = new FileOutputStream(file+"\\2.png");
        int len = 0;
        byte[] bytes = new byte[1024];
        while((len = is.read(bytes))!= -1){
            System.out.println(len);
            fos.write(bytes,0,len);
        }
        fos.close();

        OutputStream os = socket.getOutputStream();
        os.write("上传成功".getBytes());

        socket.close();
        server.close();
    }
}

客户端

public class FileUploadClient {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("G:\\test\\demo\\test\\text\\tt\\新建文件夹\\timg.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();

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

        fis.close();
        socket.close();
    }
}

测试结果