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import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import play.Logger;
 
import java.util.*;
 
 
 
@Slf4j
public class UniwebSignature {
    private static final String charset = "UTF8";
 
    public static String sign(@NonNull String text) {
        return DigestUtils.sha256Hex(text).toLowerCase();
    }
 
    /**
     * verify signature for the parameters
     */
    public static boolean verifySign(Map<String, Object> params, String privateKey) {
        List<String> keys = new ArrayList<>(params.keySet());
        HashMap<String, Object> verifyMap = new HashMap<>();
        Collections.sort(keys);
        for (String name : keys) {
 
            String val = params.get(name).toString();
            if (val == null || val.isEmpty()) {
                Logger.warn(String.format("Empty Value detected when createURL. key = %s", name));
                verifyMap.put(name, "");
                continue;
            }
            if (!StringUtils.equals(name, "signature") && !StringUtils.equals(name, "sign_type")) {
                verifyMap.put(name, val);
                //params.put(name, URLDecoder.decode(val, input_charset));
            }
        }
 
        String sign = sign(getContentToSign(verifyMap, privateKey));
        String signCode = params.get("signature").toString();
        return StringUtils.equals(sign, signCode);
    }
 
 
    public static String getContentToSign(Map<String, Object> params, String privateKey) {
        String prestr = getFirstPart(params);
        prestr += "&shared_key=" + privateKey;
        return prestr;
    }
 
    public static String getFirstPart(Map<String, Object> params) {
        List<String> keys = new ArrayList<String>(params.keySet());
        Collections.sort(keys);
 
        String prestr = "";
 
        for (int i = 0; i < keys.size(); i++) {
            String key = "" + keys.get(i);
            String value = "" + params.get(key);
 
            if (i == keys.size() - 1) {
                prestr = prestr + key + "=" + value;
            } else {
                prestr = prestr + key + "=" + value + "&";
            }
        }
 
        return prestr;
    }
 
 
    public static void main(String[] args) {
        String privateKey = "<(98c|Tz_([:]Uh/#~N.tY5Xt-$U!N@@Wg0S^qs\"fHPsMv~Xn{#dTgm`@2U_]MzS_bLN;Wq_|rzU>x:";
        Map<String, Object> params = new HashMap<>();
        params.put("service", "uniweb.spot.cancel");
        params.put("company", "6");
        params.put("transaction", "000060811880018");
        params.put("nonce", "94759888668886k66866j8676866ca5");
 
 
        String text = UniwebSignature.getContentToSign(params, privateKey);
        String sign = UniwebSignature.sign(text);
        System.out.println(sign);
 
    }
}

Main.java:14: error: class UniwebSignature is public, should be declared in a file named UniwebSignature.java
public class UniwebSignature {
       ^
Main.java:3: error: package lombok does not exist
import lombok.NonNull;
             ^
Main.java:4: error: package lombok.extern.slf4j does not exist
import lombok.extern.slf4j.Slf4j;
                          ^
Main.java:5: error: package org.apache.commons.codec.digest does not exist
import org.apache.commons.codec.digest.DigestUtils;
                                      ^
Main.java:6: error: package org.apache.commons.lang3 does not exist
import org.apache.commons.lang3.StringUtils;
                               ^
Main.java:7: error: package play does not exist
import play.Logger;
           ^
Main.java:13: error: cannot find symbol
@Slf4j
 ^
  symbol: class Slf4j
Main.java:17: error: cannot find symbol
    public static String sign(@NonNull String text) {
                               ^
  symbol:   class NonNull
  location: class UniwebSignature
Main.java:18: error: cannot find symbol
        return DigestUtils.sha256Hex(text).toLowerCase();
               ^
  symbol:   variable DigestUtils
  location: class UniwebSignature
Main.java:32: error: cannot find symbol
                Logger.warn(String.format("Empty Value detected when createURL. key = %s", name));
                ^
  symbol:   variable Logger
  location: class UniwebSignature
Main.java:36: error: cannot find symbol
            if (!StringUtils.equals(name, "signature") && !StringUtils.equals(name, "sign_type")) {
                 ^
  symbol:   variable StringUtils
  location: class UniwebSignature
Main.java:36: error: cannot find symbol
            if (!StringUtils.equals(name, "signature") && !StringUtils.equals(name, "sign_type")) {
                                                           ^
  symbol:   variable StringUtils
  location: class UniwebSignature
Main.java:44: error: cannot find symbol
        return StringUtils.equals(sign, signCode);
               ^
  symbol:   variable StringUtils
  location: class UniwebSignature
13 errors

Standard output is empty