添加http请求后端java

Question

我是网络服务的初学者，我有一个设计问题，以便拥有一个高效的代码。我在我的后端例如这样的资源：

@RequestMapping(value = "/app", method = RequestMethod.GET, produces = "application/json")
public ResponseEntity getAppList() {

    try {

        Assert.notNull(applicationService, "applicationService is null");
        System.out.println("getAppList()");
        List<AppTransferData> list = applicationService.getApplicationList();
        System.out.println(list);
        Assert.notNull(list, "list is null");
        Collections.sort(list);

        return new ResponseEntity<>(list, HttpStatus.OK);            
    }
    catch (Exception e) {

        System.out.println(e);
        return new ResponseEntity<String>(e.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
    }

    /* adding HTTP Get request here?? */
} 

我想在此资源上添加其他URL域上的http GET请求。像这样的东西

URL url = new URL(targetURL);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
...

我把它放在捕获之后还是没有？

非常感谢