1.数据在网络中传输时，需要进行加密处理

双方约定一个相同的key（key不在网络中进行传输，只传输加密数据），然后根据将key根据一定的DES规则转换，得到真正的key，在进行加密和解密，为了增加安全性，加密过程中再加上编码base64转换，解密时先解码base64

加密和解密的完整的代码：

package com.cmit.hall.plat.play.utils;import java.security.GeneralSecurityException;import java.security.Key;import java.util.Base64;import javax.crypto.Cipher;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;import org.apache.commons.codec.DecoderException;import org.apache.commons.codec.binary.Hex;/**  * 数据加密 DES方式 + Base64 * @author sun_flower * */public class EncryUtils {  public static final String KEY = "gEpCIKFVdPEBJ1pM5pLSviM2Nrj5C/A4iAw8ou+jiJpnrXigolapdcJXfmh3tECyuQnaFrvZHabcdefghijklmnabcdefghijklmnabcdefghijklmnabcdefghijklmn";  /**   * 测试   * @param args   * @throws Exception   */  public static void main(String[] args) throws Exception {    Key convertSecretKey = generateSecret(KEY);    String data = "{\"code\":\"100\",\"roleId\":[],\"userDesc\":\"测试\",\"sessionId\":\"90EA80C89F6187BAB363C9347F759E39\",\"roleList\":[],\"userName\":\"chenpeng\",\"checkCode\":\"\",\"token\":\"\",\"password\":\"eFEBcXRwTW2oMFSDwGwUKQ==\",\"createTime\":\"2019-05-27 15:30:14\",\"levelId\":\"1\",\"staffName\":\"\",\"id\":1502,\"userType\":\"1\",\"oldPwd\":\"\"}";    String enStr = encodeString(convertSecretKey, data);    decodeString(convertSecretKey, enStr);  }  /**   * 转换key   * @param key   * @return   * @throws GeneralSecurityException   */  public static Key generateSecret(String key) throws GeneralSecurityException {    byte[] bytesKey = key.getBytes();    DESKeySpec desKeySpec = new DESKeySpec(bytesKey);//实例化DESKey秘钥的相关内容    SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");//实例一个秘钥工厂，指定加密方式    Key convertSecretKey = factory.generateSecret(desKeySpec);    return convertSecretKey;  }  /**   * 加密   * @param convertSecretKey   * @param date   * @return   * @throws GeneralSecurityException   */  public static String encodeString(Key convertSecretKey, String data) throws GeneralSecurityException {    Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");//通过Cipher这个类进行加解密相关操作    cipher.init(Cipher.ENCRYPT_MODE, convertSecretKey);    byte[] enData = Base64.getEncoder().encode(data.getBytes());    byte[] result = cipher.doFinal(enData);//输入要加密的内容    System.out.println("加密的结果：" + Hex.encodeHexString(result));    return Hex.encodeHexString(result);      }    /**   * 解密   * @param convertSecretKey   * @param date   * @return   * @throws GeneralSecurityException   * @throws DecoderException    */  public static String decodeString(Key convertSecretKey, String data) throws GeneralSecurityException, DecoderException {    Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");//通过Cipher这个类进行加解密相关操作    cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);    byte[] hdata = Hex.decodeHex(data.toCharArray());    byte[] result = cipher.doFinal(hdata);    byte[] decode = Base64.getDecoder().decode(result);    System.out.println("解密结果：" + new String(decode));    return new String(decode);  }}