java-MD5-加密

import java.security.MessageDigest;
/**
 *
 * @author Administrator
 */
public class MD5 {
    
    /**
     * 
     * @param doc type: Document, DOM;
     * @param param type: BizContext;
     * @return: int
     * @throws Exception 
     * <p>
     * ** bizlet ???????? **
     * @bizlet_displayName BL_getMD5str
     * @bizlet_param passing="in" type="variable" value="/" name="" desc=""
     * @bizlet_param passing="in_out" type="field" value="/" name="" desc=""
     */    
    public final static String getMD5(String s){ 
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; 
        try { 
             byte[] strTemp = s.getBytes(); 
             MessageDigest mdTemp = MessageDigest.getInstance("MD5"); 
             mdTemp.update(strTemp); 
             byte[] md = mdTemp.digest(); 
             int j = md.length; 
             char str[] = new char[j * 2]; 
             int k = 0; 
             for (int i = 0; i < j; i++) { 
                 byte byte0 = md[i]; 
                 str[k++] = hexDigits[byte0 >>> 4 & 0xf]; 
                 str[k++] = hexDigits[byte0 & 0xf]; 
                 } 
            return new String(str); 
           }catch (Exception e){ 
           return null;
         } 
    }