MD5加密

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public class MD5Test {    public static String getString(String str) throws NoSuchAlgorithmException {        MessageDigest md5 = MessageDigest.getInstance("MD5");        md5.update(str.getBytes());        byte[] bytes = md5.digest();        StringBuffer buffer = new StringBuffer();        for(int i=0;i<bytes.length;i++){            buffer.append(bytes[i]);        }        return buffer.toString();//  ===============================================================        MessageDigest md5 = MessageDigest.getInstance("MD5");        md5.update(str.getBytes());        byte[] bytes = md5.digest();        StringBuffer stringBuffer = new StringBuffer();        for (int i = 0; i < bytes.length; i++) {            String hex = Integer.toHexString(bytes[i] & 0xFF);            if(hex.length() == 1){                hex = "0"+hex;            }            stringBuffer.append(hex);        }        return stringBuffer.toString();    }}

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