RestClient工具类

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;

/**
 * RestClient工具类
 *
 **/
@Component
@Slf4j
public class RestUtils
{
    private static RestTemplate restTemplate;

    @Autowired
    public void setRestTemplate(RestTemplate restTemplate)
    {
        RestUtils.restTemplate = restTemplate;
    }

    public static String doGet(String targetURL, HttpHeaders httpHeaders) throws IOException
    {
        HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(null, httpHeaders);
        final HttpMethod method = HttpMethod.GET;
        ResponseEntity<String> responseEntity = restTemplate.exchange(targetURL.trim(), method, entity,
                                                                      String.class);
        return getResponseBody(responseEntity, method, targetURL);
    }

    public static String doPost(String targetURL, String serialCode) throws IOException
    {
        ResponseEntity<String> responseEntity = restTemplate.postForEntity(targetURL.trim(), serialCode, String.class);
        final HttpMethod method = HttpMethod.POST;
        return getResponseBody(responseEntity, method, targetURL);
    }

    private static String getResponseBody(ResponseEntity<String> entity, HttpMethod method, String targetURL) throws IOException
    {
        HttpStatus status = entity.getStatusCode();
        if (!status.equals(HttpStatus.OK))
        {
            log.error("{} {} response status is not 200, is {}.", method, targetURL, status);
            throw new IOException("response code is not 200.");
        }
        String responseString = entity.getBody();
        if (StringUtils.isBlank(responseString))
        {
            log.error("{} {} response code 200 but body is null or empty.", method, targetURL);
            throw new IOException("response code 200 but body is null or empty.");
        }
        return responseString;
    }
}