工具类 restTemplateUtil中帮助类（持续更新。。）

import com.zzb.business.customerInfo.config.ReportConfig;
import com.zzb.business.customerInfo.config.connection.PengYuanConfig;
import org.springframework.core.io.FileSystemResource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;

import java.io.File;
import java.io.IOException;
import java.util.Map;

/**
 * @author edison_kwok
 */
public class RestTemplateUtils {

    /**
     * 可以设置请求头参数和请求体参数的post方法
     *
     * @param url
     * @param headers
     * @param params
     * @param restTemplate
     * @return
     */
    public static String postConnect(String url, Map headers, Map params, RestTemplate restTemplate) {
        //header信息，包括了http basic认证信息
        MultiValueMap headersMap = new LinkedMultiValueMap<>();
        for (String key : headers.keySet()) {
            headersMap.add(key, headers.get(key));
        }
        //body请求体部分
        MultiValueMap bodyMap = new LinkedMultiValueMap<>();
        for (String key : params.keySet()) {
            bodyMap.add(key, params.get(key));
        }
        //merge成为一个HttpEntity
        HttpEntity> multiValueMapHttpEntity = new HttpEntity<>(bodyMap, headersMap);

        //当响应的值为400或401时候也要正常响应，不要抛出异常
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            @Override
            public void handleError(ClientHttpResponse response) throws IOException {
                if (response.getRawStatusCode() != 400 || response.getRawStatusCode() != 401) {
                    super.handleError(response);
                }
            }
        });

        ResponseEntity responseEntity = restTemplate.exchange(url, HttpMethod.POST, multiValueMapHttpEntity, String.class);
        return responseEntity.getBody();
    }

    /**
     * 上传文件到文件系统
     *
     * @param file
     * @return
     */
    public static String upload(File file, RestTemplate restTemplate, String uploadUrl) {
        if (!file.exists()) {
            return null;
        }
        //将文件传入文件管理系统
        FileSystemResource resource = new FileSystemResource(file);
        MultiValueMap param = new LinkedMultiValueMap<>();
        param.add("file", resource);
        ResponseEntity pathEntity = restTemplate.postForEntity(uploadUrl, param, String.class);
        //删除本地文件
        file.delete();
        //返回文件路径 例如：risk/file/customerReport/20190621/19062113582560509589.pdf
        try {
            return JsonUtils.parse(pathEntity.getBody(), new Object[0]);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

转载于:https://my.oschina.net/edisonOnCall/blog/3080224