发送get请求并且发送请求头（header），java实现

男娘i 2024-04-06 15:17 165阅读 0赞

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

![f61d518d63d741aaaeec16adf02d0ae0.png][]

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;
        }
    }

[f61d518d63d741aaaeec16adf02d0ae0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/7995a61c22ee44f0b5175908eaea3af4.png