我们定义发送者和接收者，发送者作为客户端，接收者作为服务端。
Sender.java
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.Arrays;
public class Sender {
public static void main(String[] args) throws Exception {
// 127.0.0.1 代表本机地址，在 8888 端口上监听
Sender sender = new Sender("127.0.0.1", 8888);
byte[] bytes = {15, 16, 17, 120}; // 对应的十六进制是 0F 10 11 78
sender.send(bytes);
System.out.println("发送" + Arrays.toString(bytes) + "完毕！");
}
private final String host;
private final int port;
public Sender(String host, int port) {
this.host = host;
this.port = port;
}
private void send(byte[] bytes) throws IOException {
Socket socket = new Socket(host, port); // 建立和服务端的 socket
try (DataOutputStream dos // 建立输出流
= new DataOutputStream(socket.getOutputStream())) {
dos.write(bytes, 0, bytes.length); // 向输出流写入 bytes
}
}
}
Receiver.java
import java.io.DataInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class Receiver {
public static void main(String[] args) throws Exception {
Receiver receiver = new Receiver(8888);
receiver.receive();
}
private final ServerSocket serverSocket;
public Receiver(int port) throws IOException {
serverSocket = new ServerSocket(port);
}
private void receive() throws IOException {
System.out.println("等待客户端连接...");
Socket socket = serverSocket.accept();
try (DataInputStream dis = new DataInputStream(socket.getInputStream())) {
byte[] bytes = new byte[1024]; // 假设发送的字节数不超过 1024 个
int size = dis.read(bytes); // size 是读取到的字节数
String hex = bytesToHex(bytes, 0, size);
System.out.println("接收到的byte数组的十六进制：" + hex);
}
}
/**
* 将 byte 数组转化为十六进制字符串
*
* @param bytes byte[] 数组
* @param begin 起始位置
* @param end 结束位置
* @return byte 数组的十六进制字符串表示
*/
private String bytesToHex(byte[] bytes, int begin, int end) {
StringBuilder hexBuilder = new StringBuilder(2 * (end - begin));
for (int i = begin; i < end; i++) {
hexBuilder.append(Character.forDigit((bytes[i] & 0xF0) >> 4, 16)); // 转化高四位
hexBuilder.append(Character.forDigit((bytes[i] & 0x0F), 16)); // 转化低四位
hexBuilder.append(' '); // 加一个空格将每个字节分隔开
}
return hexBuilder.toString().toUpperCase();
}
}
运行，首先启动服务端：
然后启动客户端：
查看接收结果：
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