登录 之 密码加密处理

package com.net.convert;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Security {
private String securityStr=null;
private String securityResult=null;

public Security(){}

public Security(String securityStr){
this.securityStr=securityStr;
}

public void setSecurityStr(String securityStr){
this.securityStr=securityStr;
}

public String getSecurityResult(){
return this.securityResult;
}

// algorithm in [MD5 and SHA]
public void securityAlgorithm(String algorithm) {
char hexDigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd','e','f'};
MessageDigest md = null;
try {
md = MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
System.out.println("No such this algorithm [ "+algorithm+" ]");
e.printStackTrace();
}

try {
md.update(this.securityStr.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte[] byteDigest = md.digest();
char[] buf = new char[byteDigest.length*2];
int index=0;
for (int offset = 0; offset < byteDigest.length; offset++) {
byte byteTmp = byteDigest[offset];
buf[index++] = hexDigits[byteTmp >>> 4 & 0xf];
buf[index++] = hexDigits[byteTmp & 0xf];
}
this.securityResult=new String(buf).toUpperCase();
}

}