Java加密工作类

package com.gxtuan.util;


import java.security.NoSuchAlgorithmException;


import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class JiaMi {


private String iv = "feie91o96t2q2p0p";
private IvParameterSpec ivspec;
private SecretKeySpec keyspec;
private Cipher cipher;

private String SecretKey = "8d0bfe2fb0311fd7";

public JiaMi()
{
ivspec = new IvParameterSpec(iv.getBytes());


keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");

try {
cipher = Cipher.getInstance("AES/CBC/NoPadding");
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchPaddingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public byte[] encrypt(String text) throws Exception
{
if(text == null || text.length() == 0)
throw new Exception("Empty string");

byte[] encrypted = null;


try {
cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);


encrypted = cipher.doFinal(padString(text).getBytes());
} catch (Exception e)
{
throw new Exception("[encrypt] " + e.getMessage());
}

return encrypted;
}

public byte[] decrypt(String code) throws Exception
{
if(code == null || code.length() == 0)
throw new Exception("Empty string");

byte[] decrypted = null;


try {
cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

decrypted = cipher.doFinal(hexToBytes(code));
} catch (Exception e)
{
throw new Exception("[decrypt] " + e.getMessage());
}
return decrypted;
}




public static String bytesToHex(byte[] data)
{
if (data==null)
{
return null;
}

int len = data.length;
String str = "";
for (int i=0; i<len; i++) {
if ((data[i]&0xFF)<16)
str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
else
str = str + java.lang.Integer.toHexString(data[i]&0xFF);
}
return str;
}


public static byte[] hexToBytes(String str) {
if (str==null) {
return null;
} else if (str.length() < 2) {
return null;
} else {
int len = str.length() / 2;
byte[] buffer = new byte[len];
for (int i=0; i<len; i++) {
buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
}
return buffer;
}
}




private static String padString(String source)
{
 char paddingChar = ' ';
 int size = 16;
 int x = source.length() % size;
 int padLength = size - x;


 for (int i = 0; i < padLength; i++)
 {
 source += paddingChar;
 }


 return source;
}
}
//使用方法：
//加密
String   encrypted = JiaMi.bytesToHex(jm.encrypt("你要加密的内容"));
//解密


String decrypted = new String(JiaMi.decrypt(encrypted));