HttpClient携带请求JSON数据访问HTTP接口得到响应JSON数据

package com.jake.myproj.controller;

import com.alibaba.fastjson.JSON;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
@RequestMapping(value = "/rabbit")
public class BpmToRabbitController {

    private static final String RABBIT_API_URL = "http://localhost:8082/api/rfc/json";

    @RequestMapping(value = "/api")
    public Map<String, Object> visitRabbitApi(@RequestBody Map<String, Object> requestMap) throws Exception {
        CloseableHttpClient client = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(RABBIT_API_URL);
        String requestJson = JSON.toJSONString(requestMap);
        StringEntity stringEntity = new StringEntity(requestJson);
        stringEntity.setContentEncoding("UTF-8");
        stringEntity.setContentType("application/json");
        httpPost.setEntity(stringEntity);
        CloseableHttpResponse httpResponse = client.execute(httpPost);
        if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
            String responseJson = EntityUtils.toString(httpResponse.getEntity());
            Map<String, Object> responseMap = JSON.parseObject(responseJson);
            return responseMap;
        }
        return null;
    }

}