java发送post请求json java发送post请求设置header

String url = "https://www.baidu.com";
HttpHeaders headers = new HttpHeaders();
//设置请求头，自己从浏览器复制一个，如果请求的网站没要求也可以不设置
headers.set("user-agent", "...");
//请求格式，表单，或者使用Json的application/json
headers.set("Content-Type", "application/x-www-form-urlencoded");
//添加参数
MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();
params.add("keyword","test");
//...
HttpEntity<MultiValueMap<String, Object>> httpEntity = new HttpEntity<>(params, headers);
exchange = restTemplate.exchange(url, HttpMethod.POST, httpEntity, String.class);
String res = exchange.getBody();