Java中网络编程实现局域网图片上传

Java中网络编程实现局域网图片上传

实现步骤

这其中省略了许多的细节过程：创建套接字，绑定端口和地址，流的封装/拆封装。

• 找到文件
• 提取文件数据
• 设置接收方文件收取容器
• 传送文件数据
• 关闭相关的流

实现细节（以实现服务器/客户端收发数据为例简单介绍）

服务端

• 初始化

  ServerSocket serverSocket = null; // 创建套接字
  InputStream inputStream = null; // 创建接收数据的流
  serverSocket = new ServerSocket(8800);
  

• 等待连接

  Socket socket = serverSocket.accept(); // 监听客户端
  

• 处理数据

  inputStream = socket.getInputStream(); // 获取客户端发来的数据
  byte[] bytes = new byte[1024]; // 由于储存客户端发来的数据
  

• 收尾

try {
    serverSocket.close();
    inputStream.close();
} catch (IOException e) {
    e.printStackTrace();
}

客户端

• 创建连接

  Socket socket = new Socket("localhost", 8800);
  

• 获取/发送数据

  String message = "Java网络编程";
  OutputStream outputStream = socket.getOutputStream();
  outputStream.write(message.getBytes(StandardCharsets.UTF_8));
  socket.shutdownOutput();
  

• 关闭连接

  socket.close();
  outputStream.close();
  

高级应用

• 服务器

package Network;

  import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;

public class PictureServer {
    public static void main(String[] args) {
        ServerSocket serverSocket= null;
        Socket socket = null;
        InputStream inputStream = null;
        OutputStream outputStream = null;
        BufferedInputStream bufferedInputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        try {
            serverSocket = new ServerSocket(9999);
            socket = serverSocket.accept();
            inputStream = socket.getInputStream();
            bufferedInputStream = new BufferedInputStream(inputStream);
            outputStream = new FileOutputStream("3.png");
            bufferedOutputStream = new BufferedOutputStream(outputStream);
            bufferedOutputStream.write(bufferedInputStream.readAllBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                serverSocket.close();
                socket.close();
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

• 客户端

package Network;
  
  import java.io.*;
  import java.net.Socket;
  
  public class PictureClient {
      public static void main(String[] args) {
          Socket socket = null;
          InputStream inputStream = null;
          OutputStream outputStream = null;
          BufferedOutputStream bufferedOutputStream = null;
          BufferedInputStream bufferedInputStream = null;
          int read = 0;
          try {
              socket = new Socket("localhost", 9999);
              inputStream = new FileInputStream("img.png");
              bufferedInputStream = new BufferedInputStream(inputStream);
              outputStream = socket.getOutputStream();
              bufferedOutputStream = new BufferedOutputStream(outputStream);
              bufferedOutputStream.write(bufferedInputStream.readAllBytes());
              socket.shutdownOutput();
          } catch (IOException e) {
              e.printStackTrace();
          }finally {
              try {
                  socket.close();
                  inputStream.close();
                  outputStream.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
      }
  }