Md5加密工具类

Java代码

 /**
 *对数据进行MD5加密<br>
 *
 */
 importjava.security.MessageDigest;

 importorg.apache.log4j.Logger;

 publicclassMd5{

 privatestaticfinalLoggerlogger=Logger.getLogger(Md5.class);

 publicMd5(){
 }

 publicstaticStringgetMD5(StringsourceStr)
 {
 logger.info("正在对数据进行加密,现返回加密值...");
 charhexDigits[]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
 try
 {
 byte[]strTemp=sourceStr.getBytes();
 MessageDigestmdTemp=MessageDigest.getInstance("MD5");
 mdTemp.update(strTemp);
 byte[]md=mdTemp.digest();
 intj=md.length;
 charstr[]=newchar[j*2];
 intk=0;
 for(inti=0;i<j;i++)
 {
 bytebyte0=md[i];
 str[k++]=hexDigits[byte0>>>4&0xf];//取字节中高4位的数字转换,>>>为逻辑右移，将符号位一起右移

 str[k++]=hexDigits[byte0&0xf];//取字节中低4位的数字转换
 }
 returnnewString(str);
 }
 catch(Exceptione)
 {
 logger.info("对数据加密失败...");
 returnnull;
 }
 }

 publicstaticvoidmain(String[]args){
 Stringpwd="123456";
 System.out.println(Md5.getMD5(pwd));
 }

 }