在对平安性请求比较高的报文做加密的时刻，算法有很多种，我这里重要用到的就是AES加密算法。因为在国内运用，所以不可避免的要对中文举行加密和解密，而在这个历程当中，发明，假如不做处置惩罚，很轻易会涌现中文乱码。（引荐：java视频教程）
下面是罕见的状况：
一、中文乱码
不对暗码举行编码处置惩罚
byte[] decryptResult = decrypt(encryptResult, password);
System.out.println("解密后：" + new String(decryptResult));
运转后
加密前：我是shoneworn 解密后：鎴戞槸shoneworn
二、对笔墨举行编码处置惩罚，但是在传输历程当中轻率的将byte[]转成String, String code = new String(bytes); 因为AES加密算法请求密文是16位的倍数。所以，这么处置惩罚，在解密的时刻，就会报种种错。比方下面的。
String code = new String(encryptResult); byte[] decryptResult = decrypt(code.getBytes(), password);
AES加密时会将被加密数据转换成编码花样的字节数组也就是String.getBytes()要领，当getBytes要领不设置参数时，默许运用本机默许编码花样，改成String.getBytes(“utf-8”)问题解决。
运用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
* 须要加密的内容
* @param password
* 加密暗码
* @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");// 建立暗码器
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");// 建立暗码器
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
* 须要加密的内容
* @param password
* 加密暗码
* @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);
//传输历程,不转成16进制的字符串，就等着顺序崩溃掉吧
String code = parseByte2HexStr(encode);
System.out.println("密笔墨符串：" + 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
}
}
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