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));
}

}