java密码MD5加密

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import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.apache.log4j.Logger;
/**
* 将密码进行MD5加密处理
*/
public class PassWordDigester {
private static Logger logger = Logger.getLogger(PassWordDigester.class);
private static final String ALGORITHM_MD5 = "MD5";
/**
* Encrypt the password with MD5
* @param pass the password to encryption
* @return encryption string
*/
public static String getPassMD5(String pass) {
String keys = null;
try {
MessageDigest md = MessageDigest.getInstance(ALGORITHM_MD5);
if (pass == null) {
pass = "";
}
byte[] bPass = pass.getBytes("UTF-8");
md.update(bPass);
//
keys = new String(md.digest(), "GBK");
keys = bytesToHexString(md.digest());
}
catch (NoSuchAlgorithmException aex) {
logger.error("there is no " + ALGORITHM_MD5 + " Algorithm!");
}
catch (java.io.UnsupportedEncodingException uex) {
logger.error("can not encode the password - " + uex.getMessage());
}
return keys;
}
/**
* 将beye[]转换为十六进制字符串
* @param bArray
* @return
*/
public static final String bytesToHexString(byte[] bArray) {
StringBuffer sb = new StringBuffer(bArray.length);
String sTemp;
for (int i = 0; i < bArray.length; i++) {
sTemp = Integer.toHexString(0xFF & bArray[i]);
if (sTemp.length() < 2){
sb.append(0);
}
sb.append(sTemp.toUpperCase());
}
return sb.toString();
}
public static void main(String[] args){
String a = "qazwsx";
System.out.println(getPassMD5(a));
}
}

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