Android中UDP发送报文
16lz
2021-01-26
实现代码 上面写了备注
//随机的uuid String uuid = UUID.randomUUID().toString(); //定义传输的数据 userName是我接收的参数 final String s = "TEL=" + username + "&SEQ=" + uuid; //key是我后端的协商秘钥 String key = ""; //aes加密 这里有个aes的工具类 final AES aes = new AES(key); byte[] enContentSend = aes.encrypt(s, key); assert enContentSend != null; final ByteBuffer bf = ByteBuffer.allocate(4 + enContentSend.length); bf.putInt(enContentSend.length); bf.put(enContentSend); bf.position(0); logger.info("将字符串长度转换为byte" + Arrays.toString(bf.array())); //设置ip地址 final String hostIP = "192.168.7.1"; //设置端口地址 final int port = 8080; new Thread(new Runnable() { @Override public void run() { DatagramSocket socket = null; try { socket = new DatagramSocket(); socket.setSoTimeout(3_000); // 2、创建host的地址包装实例 SocketAddress socketAddr = new InetSocketAddress(hostIP, port); DatagramPacket out = new DatagramPacket(bf.array(), bf.capacity(), socketAddr); socket.send(out); byte[] buffer = new byte[1024]; DatagramPacket packet = new DatagramPacket(buffer, buffer.length); socket.receive(packet); enContentReceive = AES.byte2hex(packet.getData()).substring(0, 136); logger.error("收到加密密文(带数据长度)：" + enContentReceive); String enContentRec = enContentReceive.substring(8); logger.error("收到加密密文(纯加密数据)：" + enContentRec); enContentRec = enContentRec.substring(0, 32); //使用秘钥解密 String deContent = aes.decrypt(enContentRec, "0123456789012345"); logger.error("加密的数据" + enContentRec + "解密的数据" + deContent); //93119462813 //成功和失败的结果处理 具体的按后台返回处理 if (deContent != null && deContent.equals("RESULT=ERROR")) { } if (deContent != null && deContent.equals("RESULT=SUCCESS")) { } } catch (IOException e) { e.printStackTrace(); logger.error(e.getMessage()); } catch (Exception e) { logger.error(e.getMessage()); e.printStackTrace(); } finally { if (null != socket) { socket.close(); } } } }).start();下面是AES加密解密的工具类
import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;/** * This program generates a AES key, retrieves its raw bytes, and then * reinstantiates a AES key from the key bytes. The reinstantiated key is used * to initialize a AES cipher for encryption and decryption. */public class AES { private static final String AES = "AES"; private static String CRYPT_KEY = "xinli_zhejiang12"; private static AESinstance; /** * Instantiates a new Aes. * * @param key the key */ public AES(String key) { CRYPT_KEY=key; } /** * 加密 * * @param src the src * @param key the key * @return byte [ ] * @throws Exception the exception */ public byte[] encrypt(byte[] src, String key) throws Exception { Cipher cipher = Cipher.getInstance(AES); SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES); cipher.init(Cipher.ENCRYPT_MODE, securekey);//设置密钥和加密形式 return cipher.doFinal(src); } /** * 加密 * * @param data the data * @param key the key * @return byte [ ] * @throws Exception */ public final byte[] encrypt(String data,String key) { try { return encrypt(data.getBytes(), key); } catch (Exception e) { } return null; } /** * 解密 * * @param src the src * @param key the key * @return byte [ ] * @throws Exception the exception */ public static byte[] decrypt(byte[] src, String key) throws Exception { Cipher cipher = Cipher.getInstance(AES); SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), AES);//设置加密Key cipher.init(Cipher.DECRYPT_MODE, securekey);//设置密钥和解密形式 return cipher.doFinal(src); } /** * 解密 * * @param data the data * @param key the key * @return string * @throws Exception */ public final String decrypt(String data,String key) { try { return new String(decrypt(hex2byte(data.getBytes()), key)); } catch (Exception e) { } return null; } /** * 二行制转十六进制字符串 * * @param b the b * @return string */ public static String byte2hex(byte[] b) { String hs = ""; String stmp = ""; for (int n = 0; n < b.length; n++) { stmp = (java.lang.Integer.toHexString(b[n] & 0XFF)); if (stmp.length() == 1) hs = hs + "0" + stmp; else hs = hs + stmp; } return hs.toUpperCase(); } /** * Hex 2 byte byte [ ]. * * @param b the b * @return the byte [ ] */ public static byte[] hex2byte(byte[] b) { if ((b.length % 2) != 0) throw new IllegalArgumentException("长度不是偶数"); byte[] b2 = new byte[b.length / 2]; for (int n = 0; n < b.length; n += 2) { String item = new String(b, n, 2); b2[n / 2] = (byte) Integer.parseInt(item, 16); } return b2; } /** * 加密 * * @param data the data * @return string * @throws Exception */ public final String encrypt(String data) { try { return byte2hex(encrypt(data.getBytes(), CRYPT_KEY)); } catch (Exception e) { } return null; } /** * Int to byte array byte [ ]. * * @param i the * @return the byte [ ] */ public byte[] intToByteArray(int i) { byte[] result = new byte[4]; //由高位到低位 result[0] = (byte)((i >> 24) & 0xFF); result[1] = (byte)((i >> 16) & 0xFF); result[2] = (byte)((i >> 8) & 0xFF); result[3] = (byte)(i & 0xFF); return result; }}更多相关文章
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