【HAVENT原創】Spring RestTemplate 工具類

精簡版 RestTemplateUtil ( 單例模式，附帶自定義 httpHeaders 提交 )

package com.havent.mobile.utils;

/**
 * Spring RestTemplate 工具類
 * @author HAVENT
 * @date 2018-07-29
 */

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

public class RestTemplateUtil {

    private static class SingletonRestTemplate {
        static final RestTemplate INSTANCE = new RestTemplate();
    }

    private RestTemplateUtil() {
    }


    public static RestTemplate getInstance() {
        return SingletonRestTemplate.INSTANCE;
    }

    public static String post(String url, String data, String token)
            throws Exception {
        HttpHeaders headers = new HttpHeaders();
        headers.add("Accept", "application/json");
        headers.add("Accpet-Encoding", "gzip");
        headers.add("Content-Encoding", "UTF-8");
        headers.add("Content-Type", "application/json; charset=UTF-8");
        headers.add("ACCESS_TOKEN", token);

        HttpEntity<String> requestEntity = new HttpEntity<String>(data, headers);
        return RestTemplateUtil.getInstance().postForObject(url, requestEntity, String.class);
    }

    public static  String get(String url, String token) {
        HttpHeaders headers = new HttpHeaders();
        headers.add("Accept", "application/json");
        headers.add("Accpet-Encoding", "gzip");
        headers.add("Content-Encoding", "UTF-8");
        headers.add("Content-Type", "application/json; charset=UTF-8");
        headers.add("ACCESS_TOKEN", token);

        HttpEntity<String> requestEntity = new HttpEntity<String>(null, headers);
        ResponseEntity<String> response = RestTemplateUtil.getInstance().exchange(url, HttpMethod.GET, requestEntity, String.class);
        String responseBody = response.getBody();
        return responseBody;
    }

}