Answers for "loop through array with for loop"

javascript loop through array

var data = [1, 2, 3, 4, 5, 6];

// traditional for loop
for(let i=0; i<=data.length; i++) {
  console.log(data[i])  // 1 2 3 4 5 6
}

// using for...of
for(let i of data) {
	console.log(i) // 1 2 3 4 5 6
}

// using for...in
for(let i in data) {
  	console.log(i) // Prints indices for array elements
	console.log(data[i]) // 1 2 3 4 5 6
}

// using forEach
data.forEach((i) => {
  console.log(i) // 1 2 3 4 5 6
})
// NOTE ->  forEach method is about 95% slower than the traditional for loop

// using map
data.map((i) => {
  console.log(i) // 1 2 3 4 5 6
})

jacascript loop array

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class PaymentCheck {

	public static final String IMPORT_TOKEN_URL = "https://api.iamport.kr/users/getToken";
	public static final String IMPORT_PAYMENTINFO_URL = "https://api.iamport.kr/payments/find/";
	public static final String IMPORT_CANCEL_URL = "https://api.iamport.kr/payments/cancel";
	public static final String IMPORT_PREPARE_URL = "https://api.iamport.kr/payments/prepare";
	
	public static final String KEY = "아임포트 Rest Api key";
	public static final String SECRET = "아임포트 Rest Api Secret";
	
    // 아임포트 인증(토큰)을 받아주는 함수
	public String getImportToken() {
		String result = "";
		HttpClient client = HttpClientBuilder.create().build();
		HttpPost post = new HttpPost(IMPORT_TOKEN_URL);
		Map<String,String> m  =new HashMap<String,String>();
		m.put("imp_key", KEY);
		m.put("imp_secret", SECRET);
		try {
			post.setEntity(new UrlEncodedFormEntity(convertParameter(m)));
			HttpResponse res = client.execute(post);
			ObjectMapper mapper = new ObjectMapper();
			String body = EntityUtils.toString(res.getEntity());
			JsonNode rootNode = mapper.readTree(body);
			JsonNode resNode = rootNode.get("response");
			result = resNode.get("access_token").asText();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}
	
    // Map을 사용해서 Http요청 파라미터를 만들어 주는 함수
	private List<NameValuePair> convertParameter(Map<String,String> paramMap){
		List<NameValuePair> paramList = new ArrayList<NameValuePair>();
		
		Set<Entry<String,String>> entries = paramMap.entrySet();
		
		for(Entry<String,String> entry : entries) {
			paramList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		}
		return paramList;
	}
	
    // 결제취소
	public int cancelPayment(String token, String mid) {
		HttpClient client = HttpClientBuilder.create().build();
		HttpPost post = new HttpPost(IMPORT_CANCEL_URL);
		Map<String, String> map = new HashMap<String, String>();
		post.setHeader("Authorization", token);
		map.put("merchant_uid", mid);
		String asd = "";
		try {
			post.setEntity(new UrlEncodedFormEntity(convertParameter(map)));
			HttpResponse res = client.execute(post);
			ObjectMapper mapper = new ObjectMapper();
			String enty = EntityUtils.toString(res.getEntity());
			JsonNode rootNode = mapper.readTree(enty);
			asd = rootNode.get("response").asText();
		} catch (Exception e) {
			e.printStackTrace();
		}
		if (asd.equals("null")) {
			System.err.println("환불실패");
			return -1;
		} else {
			System.err.println("환불성공");
			return 1;
		}
	}
	
    // 아임포트 결제정보를 조회해서 결제금액을 뽑아주는 함수
	public String getAmount(String token, String mId) {
		String amount = "";
		HttpClient client = HttpClientBuilder.create().build();
		HttpGet get = new HttpGet(IMPORT_PAYMENTINFO_URL + mId + "/paid");
		get.setHeader("Authorization", token);

		try {
			HttpResponse res = client.execute(get);
			ObjectMapper mapper = new ObjectMapper();
			String body = EntityUtils.toString(res.getEntity());
			JsonNode rootNode = mapper.readTree(body);
			JsonNode resNode = rootNode.get("response");
			amount = resNode.get("amount").asText();
		} catch (Exception e) {
			e.printStackTrace();
		}

		return amount;
	}
	
    // 아임포트 결제금액 변조는 방지하는 함수
	public void setHackCheck(String amount,String mId,String token) {
		HttpClient client = HttpClientBuilder.create().build();
		HttpPost post = new HttpPost(IMPORT_PREPARE_URL);
		Map<String,String> m  =new HashMap<String,String>();
		post.setHeader("Authorization", token);
		m.put("amount", amount);
		m.put("merchant_uid", mId);
		try {
			post.setEntity(new UrlEncodedFormEntity(convertParameter(m)));
			HttpResponse res = client.execute(post);
			ObjectMapper mapper = new ObjectMapper();
			String body = EntityUtils.toString(res.getEntity());
			JsonNode rootNode = mapper.readTree(body);
			System.out.println(rootNode);
		} catch (Exception e) {
			e.printStackTrace();
		}	
	}
	
//	public static void main(String...args) {
//		new PaymentCheck().cancelPayment(new PaymentCheck().getImportToken(), "merchant_1563254570837");
//	}
}