DES加密解密类

public class DESUtil {
private static final Logger logger = LoggerFactory.getLogger(DESUtil.class);

private static Key key;
//设置秘钥key
private static String KEY_STR="LQT_WS";
private static String CHARSETNAME="UTF-8";
private static String ALGORITHM="DES";

static{
	try{
		//生成DES算法对象
		KeyGenerator generator=KeyGenerator.getInstance(ALGORITHM);
		//运用SHA1安全策略
		SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");
		//设置上**种子
		secureRandom.setSeed(KEY_STR.getBytes());
		//初始化基于SHA1的算法对象
		generator.init(secureRandom);
		//生成**对象
		key=generator.generateKey();
		generator=null;
	}catch(Exception e){
		throw new RuntimeException(e);
	}
}

/**
 * 获取加密的信息
 * @param str
 * @return
 */
public static String getEncryptString(String str){
	//基于BASE64编码，接收byte[]并转换成String
	Base64 base64 = new Base64();
	try {
		// 按UTF8编码
		byte[] bytes = str.getBytes(CHARSETNAME);
		// 获取加密对象
		Cipher cipher = Cipher.getInstance(ALGORITHM);
		// 初始化密码信息
		cipher.init(Cipher.ENCRYPT_MODE, key);
		// 加密
		byte[] doFinal = cipher.doFinal(bytes);
		// byte[]to encode好的String并返回
		return base64.encodeToString(doFinal).trim();
	} catch (Exception e) {
		throw new RuntimeException(e);
	}
}

/**
 * 获取解密之后的信息
 * 
 * @param str
 * @return
 */
public static String getDecryptString(String str) {
	// 基于BASE64编码，接收byte[]并转换成String
	Base64 base64decoder = new Base64();
	try {
		// 将字符串decode成byte[]
		byte[] bytes = base64decoder.decode(str);
		// 获取解密对象
		Cipher cipher = Cipher.getInstance(ALGORITHM);
		// 初始化解密信息
		cipher.init(Cipher.DECRYPT_MODE, key);
		// 解密
		byte[] doFinal = cipher.doFinal(bytes);
		// 返回解密之后的信息
		return new String(doFinal, CHARSETNAME);
	} catch (Exception e) {
		throw new RuntimeException(e);
	}
}

}