在对安全性要求比较高的报文做加密的时候，算法有很多种，我这里主要用到的就是AES加密算法。由于在国内使用，所以不可避免的要对中文进行加密和解密，而在这个过程中，发现，如果不做处理，很容易会出现中文乱码。

下面是常见的情况：

一、中文乱码

不对密码进行编码处理

byte[] decryptResult = decrypt(encryptResult, password);

System.out.println("解密后：" + new String(decryptResult));

运行后

加密前：我是shoneworn

解密后：鎴戞槸shoneworn

二、对文字进行编码处理，但是在传输过程中草率的将byte[]转成String, String code = new String(bytes); 由于AES加密算法要求密文是16位的倍数。所以，这么处理，在解密的时候，就会报各种错。比如下面的。

String code = new String(encryptResult);

byte[] decryptResult = decrypt(code.getBytes(), password);

结果就.........

加密前：我是shoneworn

javax.crypto.BadPaddingException: Given final block not properly padded

at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:966)

at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:824)

at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:436)

at javax.crypto.Cipher.doFinal(Cipher.java:2165)

at com.ailin.test.AES.decrypt(AES.java:72)

at com.ailin.test.AES.main(AES.java:173)

Exception in thread "main" java.lang.NullPointerException

at java.lang.String.(Unknown Source)

at com.ailin.test.AES.main(AES.java:174)

三、给功能正常的，能传中文的，不报错的AES加密加密算法源码

package com.ailin.test;

import java.io.UnsupportedEncodingException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class AES {

/**

* 加密

*

* @param content

* 需要加密的内容

* @param password

* 加密密码

* @return

*/

public static byte[] encrypt(String content, String password) {

try {

KeyGenerator kgen = KeyGenerator.getInstance("AES");

kgen.init(128, new SecureRandom(password.getBytes()));

SecretKey secretKey = kgen.generateKey();

byte[] enCodeFormat = secretKey.getEncoded();

SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");

Cipher cipher = Cipher.getInstance("AES");// 创建密码器

byte[] byteContent = content.getBytes("utf-8");

cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化

byte[] result = cipher.doFinal(byteContent);

return result; // 加密

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}

return null;

}

/**

* 解密

*

* @param content

* 待解密内容

* @param password

* 解密密钥

* @return

*/

public static byte[] decrypt(byte[] content, String password) {

try {

KeyGenerator kgen = KeyGenerator.getInstance("AES");

kgen.init(128, new SecureRandom(password.getBytes()));

SecretKey secretKey = kgen.generateKey();

byte[] enCodeFormat = secretKey.getEncoded();

SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");

Cipher cipher = Cipher.getInstance("AES");// 创建密码器

cipher.init(Cipher.DECRYPT_MODE, key);// 初始化

byte[] result = cipher.doFinal(content);

return result; // 加密

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}

return null;

}

/**

* 将二进制转换成16进制

*

* @param buf

* @return

*/

public static String parseByte2HexStr(byte buf[]) {

StringBuffer sb = new StringBuffer();

for (int i = 0; i < buf.length; i++) {

String hex = Integer.toHexString(buf[i] & 0xFF);

if (hex.length() == 1) {

hex = '0' + hex;

}

sb.append(hex.toUpperCase());

}

return sb.toString();

}

/**

* 将16进制转换为二进制

*

* @param hexStr

* @return

*/

public static byte[] parseHexStr2Byte(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);

}

return result;

}

/**

* 加密

*

* @param content

* 需要加密的内容

* @param password

* 加密密码

* @return

*/

public static byte[] encrypt2(String content, String password) {

try {

SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");

Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");

byte[] byteContent = content.getBytes("utf-8");

cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化

byte[] result = cipher.doFinal(byteContent);

return result; // 加密

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

} catch (NoSuchPaddingException e) {

e.printStackTrace();

} catch (InvalidKeyException e) {

e.printStackTrace();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IllegalBlockSizeException e) {

e.printStackTrace();

} catch (BadPaddingException e) {

e.printStackTrace();

}

return null;

}

public static void main(String[] args) throws UnsupportedEncodingException {

String content = "我是shoneworn";

String password = "12345678";

// 加密

System.out.println("加密前：" + content);

byte[] encode = encrypt(content, password);

//传输过程,不转成16进制的字符串，就等着程序崩溃掉吧

String code = parseByte2HexStr(encode);

System.out.println("密文字符串：" + code);

byte[] decode = parseHexStr2Byte(code);

// 解密

byte[] decryptResult = decrypt(decode, password);

System.out.println("解密后：" + new String(decryptResult, "UTF-8")); //不转码会乱码

}

}