利用restTemplate远程调controller路径取数据

利用restTemplate远程调controller路径取数据

Spring的RestTemplate提供了很多对HTTP method的支持，这里主要说常用的get和post。

使用环境为springboot。

首先要写相关配置类，举例：

@Configuration
public class Config {

  @Autowired
  RestTemplateBuilder builder;

  @Bean
  public RestTemplate restTemplate() {
    return builder.build();
  }
}

然后调目标cotroller层，比如目标cotroller层为

@RestController
@RequestMapping("/aaa")
public class TemplateController {
  @PostMapping(value = "/ppp")
  public List getInfo(@RequestBody String sid) {
    ...
    return stuService.getId(areaId);
  }
}

需要用post的方法去调

  @Autowired
  private RestTemplate restTemplate;

  public List getMsg() {
    String id = "111";
    HttpEntity entity = buildEntity(id);
    String url = "http://ip:port/aaa/ppp";
    return restTemplate.postForObject(url, entity, List.class);
  }

  private HttpEntity buildEntity(String id) {
    JSONObject jo = new JSONObject();
    jo.put("sid", id);
    String requestJson = jo.toJSONString();
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
    return new HttpEntity(requestJson, headers);
  }

再比如目标controller层为

@RestController
@RequestMapping(value = "/aaa")
public class StudentController {
    @GetMapping(value = "/ggg")
  public Set queryStudent(@RequestParam(value = "code") String code,
      @RequestParam(value = "objectKey") String objectKey,
      @RequestParam(value = "studentId") Integer studentId) {
    return sService.get(code, objectKey, kindId);
  }
}

需要用get的方法去调

 @Autowired
  private RestTemplate restTemplate;

  public Set queryStudent(String ip, int port,EventRelationTask eventRelationTask) {
    Integer studentId = eventRelationTask.getStudentId();
    String code = eventRelationTask.getCode();
    String objectKey = eventRelationTask.getObjectKey();
    String url =
        "http://" + ip + ":" + port + Student.PROJECTNAME + "event/queryparentnode?code=" + code + "&objectKey=" + objectKey + "&studentId=" + studentId;
    Set students = new HashSet<>();
    students = restTemplate.getForObject(url, Set.class);   //主要这个方法
    if (students != null) {
      return students;
    }
    return new HashSet();
  }