1. 創建發送http請求service層

   import org.springframework.http.*;
   import org.springframework.stereotype.Service;
   import org.springframework.util.MultiValueMap;
   import org.springframework.web.client.RestTemplate;
   
   /**
    * @Author 馮戰魁
    * @Date 2018/1/23 下午5:43
    */
   @Service
   public class HttpClient {
       public String client(String url, HttpMethod method, MultiValueMap<String, String> params){
           RestTemplate client = new RestTemplate();
           HttpHeaders headers = new HttpHeaders();
           //  請勿輕易改變此提交方式，大部分的情況下，提交方式都是表單提交
           headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
           HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<MultiValueMap<String, String>>(params, headers);
           //  執行HTTP請求
           ResponseEntity<String> response = client.exchange(url, HttpMethod.POST, requestEntity, String.class);
           return response.getBody();
       }
   }

2. 添加本地測試url localhost:8080/hello
   

   import com.example.demo.service.HttpClient;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.http.*;
   import org.springframework.util.LinkedMultiValueMap;
   import org.springframework.util.MultiValueMap;
   import org.springframework.web.bind.annotation.RequestMapping;
   import org.springframework.web.bind.annotation.RestController;
   
   
   /**
    * @Author 馮戰魁
    * @Date 2018/1/8 上午11:17
    */
   @RestController
   public class HelloController {
       @Autowired
       HttpClient httpClient;
       @RequestMapping("/hello")
       public String hello(){
           //api url地址
           String url = "http://xxxx";
           //post請求
           HttpMethod method =HttpMethod.POST;
           // 封裝參數，千萬不要替換為Map與HashMap，否則參數無法傳遞
           MultiValueMap<String, String> params= new LinkedMultiValueMap<String, String>();
           params.add("access_token", "xxxxx");
           //發送http請求並返回結果
           return httpClient.client(url,method,params);
       }
   }

3. 訪問localhost:8080/hello查看調用結果

   curl http://localhost:8080/hello
   

springboot發送http請求