md5util.java

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package tenpay.qq.com;
import java.io.PrintStream;
import java.security.MessageDigest;

public class MD5Util
{

    public MD5Util()
    {
    }

    private static String byteArrayToHexString(byte b[])
    {
        StringBuffer resultSb = new StringBuffer();
        for(int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b)
    {
        int n = b;
        if(n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    public static String MD5Encode(String origin)
    {
        String resultString = null;
        try
        {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        }
        catch(Exception exception) { }
        return resultString;
    }

    public static void main(String agrs[])
    {
        String s = "20050715002012112139549922200507150979430099100.0099.001121395613123456";
        String s2 = "MERCHANTID=010418407&POSID=000000000&BRANCHID=110000000&ORDERID=3020050516000055&PAYMENT=0.01&CURCODE=01&TXCODE=520100&REMARK1=&REMARK2=";
        String s3 = "200411191200123456";
        String s4 = "2120050622000044,12.81,00123456";
        System.out.println(MD5Encode(s));
        System.out.println(MD5Encode(s2));
        System.out.println(MD5Encode(s3));
        System.out.println(MD5Encode(s4));
        System.out.println(MD5Encode("a"));
    }

    private static final String hexDigits[] = {
        "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", 
        "a", "b", "c", "d", "e", "f"
    };

}