49 lines
1.6 KiB
Java
49 lines
1.6 KiB
Java
package com.nis.util;
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import java.net.DatagramPacket;
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import java.net.DatagramSocket;
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import java.net.InetAddress;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class UdpUtils {
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private static final Logger logger = LoggerFactory.getLogger(TextFormatUtils.class);
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public static String send(String sendIp,Integer slot,int timeout) {
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String rlt = "";
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DatagramSocket ds = null;
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try {
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ds = new DatagramSocket();//通过DatagramSocket对象创建udp服务
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ds.setSoTimeout(timeout);
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// String line = "00 06 0502 00 00 68c2"; //发送的16进制字符串
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String slotStr = slot+"";
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if(slot<10) {
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slotStr = "0"+slotStr;
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}
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String line = "00 "+slotStr+" 0502 00 00"; //发送的16进制字符串
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byte[] buf = HexUtils.hexStringToByteArray(line);
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DatagramPacket dp = new DatagramPacket(buf,buf.length,InetAddress.getByName(sendIp),6800);//发送至指定IP，指定端口
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ds.send(dp);//通过send方法将数据包发送出去
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//定义数据包,用于存储数据
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byte[] buf2 = new byte[8];
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DatagramPacket dp2 = new DatagramPacket(buf2,buf2.length);
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ds.receive(dp2);//通过服务的receive方法将收到数据存入数据包中,receive()为阻塞式方法
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//通过数据包的方法获取其中的数据
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String ip = dp2.getAddress().getHostAddress();
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System.out.println(ip+"::"+HexUtils.bytesToHexString(buf2));
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rlt = HexUtils.bytesToHexString(buf2);
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}catch (Exception e) {
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logger.error(sendIp+"::"+slot+">>"+e.getMessage());
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}finally {
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if(ds!=null) {
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ds.close();//关闭资源
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}
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}
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return rlt;
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}
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}
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