resttemplate header 设置

要设置RestTemplate的header，可以按照以下步骤进行：

1. 首先，导入需要的包：
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

2. 创建一个HttpHeaders对象，并设置需要的header信息：
HttpHeaders headers = new HttpHeaders();
headers.set("user-agent", ""); // 设置user-agent
headers.set("X-Requested-With", "XMLHttpRequest"); // 设置X-Requested-With

3. 创建一个HttpEntity对象，并将headers设置为其中的参数：
HttpEntity entity = new HttpEntity(headers);

4. 使用exchange方法发送请求并获取返回数据：
ResponseEntity<JSONObject> response = restTemplate.exchange("URL", HttpMethod.GET, entity, JSONObject.class);

5. 通过response获取返回的数据：
JSONObject jsonObject = response.getBody();

下面是一个完整的示例代码：

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import com.alibaba.fastjson.JSONObject;

RestTemplate restTemplate = new RestTemplate();

HttpHeaders headers = new HttpHeaders();
headers.set("user-agent", "");
headers.set("X-Requested-With", "XMLHttpRequest");

HttpEntity entity = new HttpEntity(headers);

ResponseEntity<JSONObject> response = restTemplate.exchange("URL", HttpMethod.GET, entity, JSONObject.class);
JSONObject jsonObject = response.getBody();

System.out.println(jsonObject);