优雅的发送http请求

做项目的时候，请求第三方接口是常用的功能：

　　一、get常用的方法及传参

　　1、使用占位符：适用于参数已知

String url = "https://q.stock.sohu.com/hisHq?code={code}8&start={start}&end={end}&stat={stat}&order={order}&period={period}&callback={callback}&rt={rt}"; 
Map<String, Object> params = new HashMap<>(); 
params.put("code", "cn_601398"); 
params.put("start", "20231130"); 
params.put("end", "20231230");
params.put("stat", 1);
params.put("order", "D");
params.put("period", "d");
params.put("callback", "historySearchHandler");
params.put("rt", "json");
ResponseEntity<RestVO> forEntity = restTemplate.getForEntity(url, RestVO.class, params);

　　2、使用UriComponentsBuilder和LinkedMultiValueMap：适用于参数个数不定

MultiValueMap<String, String> params = new LinkedMultiValueMap();
String starttime = i + startTime[j];
String endtime = i + endTime[j];
params.add("code", "cn_" + 601398);
params.add("start", starttime);
params.add("end", endtime);
params.add("stat", "1");
params.add("order", "D");
params.add("period", "d");
params.add("callback", "historySearchHandler");
params.add("rt", "json");
UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url);
URI uri = builder.queryParams(params).build().encode().toUri();
ResponseEntity<RestVO> forEntity= restTemplate.getForEntity(uri, RestVO.class);

拼接结果都一样：https://q.stock.sohu.com/hisHq?code=cn_601398&start=20231130&end=20231230&stat=1&order=D&period=d&callback=historySearchHandler&rt=json