Java commons-httpclient如果实现get及post请求

PS：这个jar包，在2007年之后就没有更新过了， 是比较老的版本了。追求新的版本 用HttpComponents 比较好

引入的jar包为：

<!-- https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient -->
<dependency>
  <groupId>commons-httpclient</groupId>
  <artifactId>commons-httpclient</artifactId>
  <version>3.1</version>
</dependency>

具体实现类为：

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

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

  private HttpClientHelper() {

  }

  /**
   * 发起POST请求
   *
   * @param url    url
   * @param paramJson 参数的json格式
   */
  public static String sendPost(String url, String paramJson) {
    logger.info("开始发起POST请求，请求地址为{}，参数为{}", url, paramJson);

    // 创建httpClient实例对象
    HttpClient httpClient = new HttpClient();
    // 设置httpClient连接主机服务器超时时间：15000毫秒
    httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
    // 创建post请求方法实例对象
    PostMethod postMethod = new PostMethod(url);
    // 设置post请求超时时间
    postMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000);
    postMethod.addRequestHeader("Content-Type", "application/json");
    try {
      //json格式的参数解析
      RequestEntity entity = new StringRequestEntity(paramJson, "application/json", "UTF-8");
      postMethod.setRequestEntity(entity);

      httpClient.executeMethod(postMethod);
      String result = postMethod.getResponseBodyAsString();
      postMethod.releaseConnection();
      return result;
    } catch (IOException e) {
      logger.error("POST请求发出失败，请求的地址为{}，参数为{}，错误信息为{}", url, paramJson, e.getMessage(), e);
    }
    return null;
  }

  /**
   * 发起GET请求
   *
   * @param urlParam url请求，包含参数
   */
  public static String sendGet(String urlParam) {
    logger.info("开始发起GET请求，请求地址为{}", urlParam);
    // 创建httpClient实例对象
    HttpClient httpClient = new HttpClient();
    // 设置httpClient连接主机服务器超时时间：15000毫秒
    httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000);
    // 创建GET请求方法实例对象
    GetMethod getMethod = new GetMethod(urlParam);
    // 设置post请求超时时间
    getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 60000);
    getMethod.addRequestHeader("Content-Type", "application/json");
    try {
      httpClient.executeMethod(getMethod);
      String result = getMethod.getResponseBodyAsString();
      getMethod.releaseConnection();
      logger.info("返回信息为{}", result);
      return result;
    } catch (IOException e) {
      logger.error("GET请求发出失败，请求的地址为{}，错误信息为{}", urlParam, e.getMessage(), e);
    }
    return null;
  }

  public static void main(String[] args) {
    String url = "https://jiashubing.cn/tencenttest";
    String param = "{\"aaa\":\"bbbbbbb\"}";
    sendPost(url, param);
    String urlParam = "https://jiashubing.cn/talk/document?fileid=1234";
    sendGet(urlParam);
  }

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://www.cnblogs.com/acm-bingzi/p/commons_httpclient.html