Java httpcomponents發(fā)送get post請求代碼實例

更新時間：2020年09月17日 11:05:10 作者：賈樹丙

這篇文章主要介紹了Java httpcomponents發(fā)送get post請求代碼實例,文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下

引入的包為：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpclient</artifactId>
  <version>4.5.8</version>
</dependency>

實現(xiàn)的工具類為：

import com.alibaba.fastjson.JSON;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public class HttpClientHelper {
  private static Logger logger = LoggerFactory.getLogger(HttpClientHelper.class);

  private HttpClientHelper() {

  }

  /**
   * 發(fā)起POST請求
   *
   * @param url   url
   * @param paramMap 參數(shù)的Map格式
   */
  public static void sendPost(String url, Map<String, String> paramMap) {
    logger.info("開始發(fā)起POST請求，請求地址為{}，參數(shù)為{}", url, JSON.toJSON(paramMap));
    CloseableHttpResponse response = null;

    try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
      String encoding = "utf-8";
      //創(chuàng)建post請求對象
      HttpPost httpPost = new HttpPost(url);
      //裝填請求參數(shù)
      List<NameValuePair> list = new ArrayList<>();
      for (Map.Entry<String, String> entry : paramMap.entrySet()) {
        list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
      }
      //設置參數(shù)到請求對象中
      httpPost.setEntity(new UrlEncodedFormEntity(list, encoding));
      httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
      httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
      response = httpClient.execute(httpPost);

    } catch (IOException e) {
      logger.error("POST請求發(fā)出失敗，請求的地址為{}，參數(shù)為{}，錯誤信息為{}", url, JSON.toJSON(paramMap), e.getMessage(), e);
    } finally {
      try {
        if (response != null) {
          response.close();
        }
      } catch (IOException e) {
        logger.error("POST請求response關(guān)閉異常，錯誤信息為{}", e.getMessage(), e);
      }
    }
  }

  /**
   * 發(fā)起GET請求
   *
   * @param urlParam url請求，包含參數(shù)
   */
  public static void sendGet(String urlParam) {
    logger.info("開始發(fā)起GET請求，請求地址為{}", urlParam);
    HttpGet httpGet = new HttpGet(urlParam);
    CloseableHttpResponse response = null;
    try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
      response = httpClient.execute(httpGet);
      int status = response.getStatusLine().getStatusCode();
      logger.error("GET請求發(fā)出成功，請求的地址為{}，返回狀態(tài)為{}", urlParam, status);
    } catch (IOException e) {
      logger.error("GET請求發(fā)出失敗，請求的地址為{}，錯誤信息為{}", urlParam, e.getMessage(), e);
    } finally {
      try {
        if (response != null) {
          response.close();
        }
      } catch (IOException e) {
        logger.error("GET請求response關(guān)閉異常，錯誤信息為{}", e.getMessage(), e);
      }
    }
  }

  public static void main(String[] args) {
    String url = "https://jiashubing.cn/tencenttest";
    //需要傳入的參數(shù)
    Map<String, String> map = new HashMap<>();
    map.put("code", "js");
    map.put("day", "0");
    map.put("city", "北京");
    map.put("dfc", "1");
    map.put("charset", "utf-8");
    sendPost(url, map);


    String urlParam = "https://jiashubing.cn/talk/document?fileid=1234ji賈樹丙";
    sendGet(urlParam);
  }
}

如果POST請求想要發(fā)送Json 格式的數(shù)據(jù)，只需要修改成這樣：