android中实现MD5摘要

转载自

http://blog.csdn.net/randyjiawenjie/article/details/6589489

Golang的话直接,fmt.Sprintf("%x",md5.Sum(nil))就可以了，JAVA里面好像没有格式化输出这样的函数

package czd.android.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5EncodeUtil {

    public static String MD5Encode(byte[] toencode) {
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            md5.reset();
            md5.update(toencode);
            return HexEncode(md5.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }
    
    public static String HexEncode(byte[] toencode) {
        StringBuilder sb = new StringBuilder(toencode.length * 2);
        for(byte b: toencode){
            sb.append(Integer.toHexString((b & 0xf0) >>> 4));
            sb.append(Integer.toHexString(b & 0x0f));
        }
        return sb.toString().toUpperCase();
    }
}