安卓 之 MD5 计算

package cn.shilight.shiguang;
import android.util.Log;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5 {

    public String getMd5(String source) throws NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("md5");
        byte[] bytes = source.getBytes();
        byte[] targetBytes = digest.digest(bytes);
        char[] characters = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        StringBuilder builder = new StringBuilder();
        for (byte b : targetBytes) {
            int high = (b >> 4) & 15;
            int low = b & 15;
            char highChar = characters[high];
            char lowChar = characters[low];
            builder.append(highChar).append(lowChar);
        }
        Log.i("md5",builder.toString());
        return builder.toString();
    }
}