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java 常用工具类,作为 apache-commons的补充
package com.centit.support.security;
import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* MD5 散列算法返回的128bit的编码，HEX编码后的长度为32Byte
* @author codefan
*
*/
@SuppressWarnings("unused")
public abstract class Md5Encoder {
private Md5Encoder() {
throw new IllegalAccessError("Utility class");
}
protected static final Logger logger = LoggerFactory.getLogger(Md5Encoder.class);
public static String encode(byte[] data){
MessageDigest MD5;
try {
MD5 = MessageDigest.getInstance("MD5");
MD5.update(data, 0, data.length);
return new String(Hex.encodeHex(MD5.digest()));
} catch (NoSuchAlgorithmException e) {
logger.error(e.getMessage(),e);//e.printStackTrace();
return null;
}
}
public static String encode(String data){
try {
return encode(data.getBytes("utf8"));
} catch (UnsupportedEncodingException e) {
logger.error(e.getMessage(),e);//e.printStackTrace();
return null;
}
}
/**
* encoding password for spring security
* 目前框架中的密码都是这样加密的
* @param data 密文
* @param salt 盐
* @return 散列值
*/
public static String encodePasswordAsSpringSecurity(String data,String salt){
return encode(data + "{" + salt + "}");
}
/**
* encoding password for spring JA-SIG Cas
* @param data 密文
* @param salt 盐
* @param iterations 迭代次数
* @return 散列值
*/
public static String encodePasswordAsJasigCas(String data,String salt, int iterations){
MessageDigest MD5;
try {
MD5 = MessageDigest.getInstance("MD5");
byte[] saltBytes = salt.getBytes("utf8");
MD5.update(saltBytes, 0, saltBytes.length);
byte[] hashedBytes = MD5.digest(data.getBytes("utf8"));
for(int i=0;i