在對(duì)安全性要求比較高的報(bào)文做加密的時(shí)候，算法有很多種，我這里主要用到的就是AES加密算法。由于在國(guó)內(nèi)使用，所以不可避免的要對(duì)中文進(jìn)行加密和解密，而在這個(gè)過(guò)程中，發(fā)現(xiàn)，如果不做處理，很容易會(huì)出現(xiàn)中文亂碼。（推薦：java視頻教程）

下面是常見(jiàn)的情況：

一、中文亂碼

不對(duì)密碼進(jìn)行編碼處理

byte[] decryptResult = decrypt(encryptResult, password);      System.out.println("解密后：" + new String(decryptResult));

運(yùn)行后

加密前：我是shoneworn 解密后：鎴戞槸shoneworn

二、對(duì)文字進(jìn)行編碼處理，但是在傳輸過(guò)程中草率的將byte[]轉(zhuǎn)成String, String code = new String(bytes); 由于AES加密算法要求密文是16位的倍數(shù)。所以，這么處理，在解密的時(shí)候，就會(huì)報(bào)各種錯(cuò)。比如下面的。

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

AES加密時(shí)會(huì)將被加密數(shù)據(jù)轉(zhuǎn)換成編碼格式的字節(jié)數(shù)組也就是String.getBytes()方法，當(dāng)getBytes方法不設(shè)置參數(shù)時(shí)，默認(rèn)使用本機(jī)默認(rèn)編碼格式，改成String.getBytes(“utf-8”)問(wèn)題解決。

使用rsa加密解密示例：

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      *            需要加密的內(nèi)容      * @param password      *            加密密碼      * @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");// 創(chuàng)建密碼器             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      *            待解密內(nèi)容      * @param password      *            解密密鑰      * @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");// 創(chuàng)建密碼器             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;     }    /**      * 將二進(jìn)制轉(zhuǎn)換成16進(jìn)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();     }    /**      * 將16進(jìn)制轉(zhuǎn)換為二進(jìn)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      *            需要加密的內(nèi)容      * @param password      *            加密密碼      * @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);                 //傳輸過(guò)程,不轉(zhuǎn)成16進(jìn)制的字符串，就等著程序崩潰掉吧         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")); //不轉(zhuǎn)碼會(huì)亂碼                      } }