发送get请求并且发送请求头（header），java实现

发送get请求时，发送请求头（Header）中的内容

方便第二次调用其他url时传递参数，例如userCode或者租户编码

调用方式

@Autowired
private HttpServletRequest request;

先注入HttpServletRequest


public xxx xxx(){
    String url = "http://" + ip +":8082/inAndOut/into/xxxxxx";
    String userCode = request.getHeader("usercode");

    //动态传递Header中的userCode，用来给组件服务接口传userCode
    Map<String, String> headers = new HashMap<>();
    headers.put("Content-Type", "application/json");
    headers.put("Authorization", "Bearer your_token_here");
    headers.put("tenantcode", tenantCode);
    headers.put("userCode", userCode);
    String request = HttpClientUtil.sendGetWithHeaders(url,headers);
}

userCode和tenantCode可以从Header中获取，前端也一样，这是在PostMan中测试

工具类

import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class GetWithHeadersExample {

    public static void main(String[] args) {
        Map<String, String> headers = new HashMap<>();
        headers.put("Content-Type", "application/json");
        headers.put("Authorization", "Bearer your_token_here");

        String url = "http://example.com/api/endpoint";

        try {
            String response = sendGetWithHeaders(url, headers);
            System.out.println("Response: " + response);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String sendGetWithHeaders(String url, Map<String, String> headers) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url);

        for (Map.Entry<String, String> entry : headers.entrySet()) {
            httpGet.addHeader(entry.getKey(), entry.getValue());
        }

        HttpResponse response = httpClient.execute(httpGet);
        HttpEntity entity = response.getEntity();

        String responseBody = EntityUtils.toString(entity);
        httpClient.close();

        return responseBody;
    }
}