MD5加密及随机数生成
今天贴两个简单的方法，需要的时候不用自己再写，public static string md5(string plaintext){messagedigest m;try {m = messagedigest.getinstance("md5");m.reset(); m.update(plaintext.getbytes()); byte[] digest = m.digest(); biginteger bigint = new biginteger(1,digest); string hashtext = bigint.tostring(16); // now we need to zero pad it if you actually want the full 32 chars. while(hashtext.length() < 32 ){ hashtext = "0"+hashtext; } return hashtext;} catch (nosuchalgorithmexception e) {e.printstacktrace();return system.currenttimemillis() + "";} }public static string randomcreator(int num){random random = new random();int i=random.nextint();i=math.abs(i);string tem=string.valueof(i);while(tem.length()<num){tem+="0";}return tem.substring(0,num);}
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