嘗試一下RestTemplate來替換HttpClient？

@RestController
public class DeptControllerConsumer {

    private static final String REST_URL_PREFIX = "http://localhost:8001";

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value="/consumer/dept/add")
    public boolean add(Dept dept)
    {
        return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add", dept, Boolean.class);
    }

    @RequestMapping(value="/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id)
    {
        return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
    }

    @SuppressWarnings("unchecked")
    @RequestMapping(value="/consumer/dept/list")
    public List<Dept> list()
    {
        return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list", List.class);
    }

}

// 使用restTemplate訪問restful接口非常的簡單粗暴無腦。
// (url, requestMap, ResponseBean.class)這三個參數分別代表 
// REST請求地址、請求參數、HTTP響應轉換被轉換成的對象類型。

1. pom中要添加

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
</dependency>

2. 啓動類中添加

@Bean
	public RestTemplate getRestTemplate(){
		return new RestTemplate();
	}
	@Bean
	public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
		SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
		factory.setReadTimeout(5000);//單位爲ms
		factory.setConnectTimeout(5000);//單位爲ms
		return factory;
	}

3. 設置請求頭的方式

//headers
HttpHeaders head = new HttpHeaders();
//設置數據傳輸格式
MediaType mediaType = MediaType.parseMediaType("application/json;charset=UTF-8 ");
head.setContentType(mediaType);
head.add("api-version", "1.0");
 //body
MultiValueMap<String, String> requestBody = new LinkedMultiValueMap<>();
requestBody.add("roundid", "1");
//HttpEntity
HttpEntity<MultiValueMap> requestEntity = new HttpEntity<MultiValueMap>(requestBody, head);
RestTemplate restTemplate = new RestTemplate();
//post
ResponseEntity<String> responseEntity = restTemplate.postForEntity("http://xxx", requestEntity, String.class);
System.out.println(responseEntity.getBody());