java 伪造http请求ip地址的方法

  import org.apache.http.HttpEntity;
  import org.apache.http.client.config.RequestConfig;
  import org.apache.http.client.methods.CloseableHttpResponse;
  import org.apache.http.client.methods.HttpPost;
  import org.apache.http.entity.StringEntity;
  import org.apache.http.impl.client.CloseableHttpClient;
  import org.apache.http.impl.client.HttpClients;
  import org.apache.http.util.EntityUtils;
  
  public static String getPost4Json(String url, String json) throws Exception {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(url);
    /* 设置超时 */
    RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).setConnectionRequestTimeout(5000).build();
    httpPost.setConfig(defaultRequestConfig);
    httpPost.addHeader("Content-Type", "application/json;charset=UTF-8");
    httpPost.setEntity(new StringEntity(json, "UTF-8"));
    CloseableHttpResponse response = null;
    String result = null;
    try {
      response = httpClient.execute(httpPost);
      HttpEntity entity = response.getEntity();
      result = EntityUtils.toString(entity, "UTF-8");
    } catch (Exception e) {
      throw e;
    } finally {
      if (response != null) response.close();
      httpClient.close();
    }
    return result;
  }

httpPost.addHeader("x-forwarded-for",ip);

String ip = request.getHeader("x-forwarded-for");