AES加解密实现源码

import javax.crypto.spec.SecretKeySpec;
import javax.crypto.Cipher;
import org.codehaus.jackson.map.ObjectMapper;
public class ED {
private static ObjectMapper mapper = new ObjectMapper();

// 转换16进制字符
private static String enc(byte[] by) {
  StringBuilder sb = new StringBuilder();
  for (int i = 0; i < by.length; i++)
  {
    String tmp = Integer.toHexString(by[i] & 0xFF);
    if (tmp.length() == 1)
    sb.append("0");
    sb.append(tmp);
  }
  return sb.toString();
}

// 16进制字符转换数组
private static byte[] dec(String hexStr) { 
if (hexStr.length() < 1) 
return null; 

byte[] result = new byte[hexStr.length() / 2]; 
for (int i = 0; i < hexStr.length() / 2; i++) { 
int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16); 
int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16); 
result[i] = (byte) (high * 16 + low); 
}