Spring-Boot 访问外部接口的方案总结

@RequestMapping("/doPostGetJson")
public String doPostGetJson() throws ParseException {
   //此处将要发送的数据转换为json格式字符串
   String jsonText = "{id：1}";
   JSONObject json = (JSONObject) JSONObject.parse(jsonText);
   JSONObject sr = this.doPost(json);
   System.out.println("返回参数：" + sr);
   return sr.toString();
}

public static JSONObject doPost(JSONObject date) {
   HttpClient client = HttpClients.createDefault();
   // 要调用的接口方法
   String url = "http://192.168.1.101:8080/getJson";
   HttpPost post = new HttpPost(url);
   JSONObject jsonObject = null;
   try {
      StringEntity s = new StringEntity(date.toString());
      s.setContentEncoding("UTF-8");
      s.setContentType("application/json");
      post.setEntity(s);
      post.addHeader("content-type", "text/xml");
      HttpResponse res = client.execute(post);
      String response1 = EntityUtils.toString(res.getEntity());
      System.out.println(response1);
      if (res.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
         String result = EntityUtils.toString(res.getEntity());// 返回json格式：
         jsonObject = JSONObject.parseObject(result);
      }
   } catch (Exception e) {
      throw new RuntimeException(e);
   }
   return jsonObject;
}

<dependency>
　　　　　　<groupId>org.springframework.cloud</groupId>
　　　　　　<artifactId>spring-cloud-starter-feign</artifactId>
　　　　　　<version>1.2.2.RELEASE</version>
</dependency>

@FeignClient(url = "${decisionEngine.url}",name="engine")
public interface DecisionEngineService {
　　@RequestMapping(value="/decision/person",method= RequestMethod.POST)
　　public JSONObject getEngineMesasge(@RequestParam("uid") String uid,@RequestParam("productCode") String productCode);

}

@EnableFeignClients //参见此处
@EnableDiscoveryClient
@SpringBootApplication
@EnableResourceServer
public class Application   implements CommandLineRunner {
    private static final Logger LOGGER = LoggerFactory.getLogger(Application.class);
    @Autowired
    private AppMetricsExporter appMetricsExporter;

    @Autowired
    private AddMonitorUnitService addMonitorUnitService;

    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);
    }    
}

@Autowired
    private DecisionEngineService decisionEngineService ;
    decisionEngineService.getEngineMesasge("uid" ,  "productCode");

//http://USER-SERVICE/user?name={1}
getForEntity("http://USER-SERVICE/user?name={1}",String.class,"didi")

// http://USER-SERVICE/user?name={name)
RestTemplate restTemplate=new RestTemplate();
Map<String,String> params=new HashMap<>();
params.put("name","dada");  //
ResponseEntity<String> responseEntity=restTemplate.getForEntity("http://USERSERVICE/user?name={name}",String.class,params);

RestTemplate restTemplate=new RestTemplate();
UriComponents uriComponents=UriComponentsBuilder.fromUriString(
"http://USER-SERVICE/user?name={name}")
.build()
.expand("dodo")
.encode();
URI uri=uriComponents.toUri();
ResponseEntity<String> responseEntity=restTemplate.getForEntity(uri,String.class).getBody();

getForObject(String url,Class responseType,Object...urlVariables)
getForObject(String url,Class responseType,Map urlVariables)
getForObject(URI url,Class responseType)

RestTemplate restTemplate=new RestTemplate();
User user=newUser("didi",30);
ResponseEntity<String> responseEntity=restTemplate.postForEntity("http://USER-SERVICE/user",user,String.class); //提交的body内容为user对象，请求的返回的body类型为String
String body=responseEntity.getBody();

postForEntity(String url,Object request,Class responseType,Object... uriVariables)
postForEntity(String url,Object request,Class responseType,Map uriVariables)
postForEntity(URI url,Object request，Class responseType)