java用udp传输一个图片_Udp实现消息的发送和接收、以及图片的上传
时间: 2024-03-22 07:38:17 浏览: 25
使用UDP传输图片需要进行以下步骤:
1. 将图片转换成字节数组
```java
File file = new File("image.jpg");
byte[] imageData = new byte[(int) file.length()];
FileInputStream fis = new FileInputStream(file);
fis.read(imageData);
fis.close();
```
2. 创建DatagramSocket对象
```java
DatagramSocket socket = new DatagramSocket();
```
3. 创建DatagramPacket对象并设置接收方地址
```java
InetAddress address = InetAddress.getByName("192.168.0.100");
int port = 12345;
DatagramPacket packet = new DatagramPacket(imageData, imageData.length, address, port);
```
4. 发送DatagramPacket
```java
socket.send(packet);
```
5. 接收DatagramPacket
```java
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
socket.receive(packet);
byte[] imageData = Arrays.copyOf(packet.getData(), packet.getLength());
```
完整代码:
发送端:
```java
import java.io.File;
import java.io.FileInputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Arrays;
public class UdpClient {
public static void main(String[] args) throws Exception {
// 1. 将图片转换成字节数组
File file = new File("image.jpg");
byte[] imageData = new byte[(int) file.length()];
FileInputStream fis = new FileInputStream(file);
fis.read(imageData);
fis.close();
// 2. 创建DatagramSocket对象
DatagramSocket socket = new DatagramSocket();
// 3. 创建DatagramPacket对象并设置接收方地址
InetAddress address = InetAddress.getByName("192.168.0.100");
int port = 12345;
DatagramPacket packet = new DatagramPacket(imageData, imageData.length, address, port);
// 4. 发送DatagramPacket
socket.send(packet);
// 5. 关闭DatagramSocket
socket.close();
}
}
```
接收端:
```java
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.util.Arrays;
public class UdpServer {
public static void main(String[] args) throws Exception {
// 1. 创建DatagramSocket对象
DatagramSocket socket = new DatagramSocket(12345);
// 2. 创建DatagramPacket对象并接收数据
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
socket.receive(packet);
// 3. 获取接收到的图片数据
byte[] imageData = Arrays.copyOf(packet.getData(), packet.getLength());
// 4. 将图片数据写入文件
FileOutputStream fos = new FileOutputStream("image.jpg");
fos.write(imageData);
fos.close();
// 5. 关闭DatagramSocket
socket.close();
}
}
```
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