Code some hash function in java: MD5, SHA-1, SHA-256

HashJCA.java

package network_security;

import java.math.BigInteger;
import java.security.MessageDigest;

/**
 *
 * @author Admin
 */
public class HashJCA {

    public String getHashMD5(String origin) throws Exception {
        MessageDigest m = MessageDigest.getInstance("MD5");
        m.update(origin.getBytes("UTF-8"), 0, origin.length());
        String md5 = new BigInteger(1, m.digest()).toString(16);
        return md5;
    }

    public String getHashSHA1(String origin) throws Exception {
        String sha1;
        MessageDigest m = MessageDigest.getInstance("SHA-1");
        m.update(origin.getBytes("UTF-8"), 0, origin.length());
        sha1 = new BigInteger(1, m.digest()).toString(16);
        return sha1;
    }

    public String getHashSHA256(String origin) throws Exception {
        String sha256;
        MessageDigest m = MessageDigest.getInstance("SHA-256");
        m.update(origin.getBytes("UTF-8"), 0, origin.length());
        sha256 = new BigInteger(1, m.digest()).toString(16);
        return sha256;
    }
}