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Apache HttpClient 是Apache 开源的实现Http协议的java开源库。

HttpClien 是客户端的HTTP通信实现库，实现HTTP GET 和POST请求，获取响应内容。

Apache网站：http://hc.apache.org/index.html

 

1. Apache HttpClient jar 包
1. httpclient.jar
2. httpcore.jar
3. httpmime.jar
4. commons-logging.jar
2. 例子：

HttpClient Get Example

   CloseableHttpClient httpClient = HttpClients.createDefault();
   HttpGet httpGet = new HttpGet("https://www.baidu.com");
   CloseableHttpResponse response = httpClient.execute(httpGet);
   try {
      //获取response的响应状态
      System.out.println(response.getStatusLine());
      //获取响应内容
      HttpEntity entity = response.getEntity();
      //确保被消耗
      EntityUtils.consume(entity);
   } finally{
      response.close();
   }

HttpClient Post Example --- 这个url是不行的，可以找个http post的请求url进行尝试

  CloseableHttpClient httpClient = HttpClients.createDefault();
  HttpPost httpPost = new HttpPost("https://www.baidu.com");
  //设置请求参数
  ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
  params.add(new BasicNameValuePair("username", "test"));
  params.add(new BasicNameValuePair("password", "test"));
  httpPost.setEntity(new UrlEncodedFormEntity(params));
  CloseableHttpResponse response = httpClient.execute(httpPost);
  try {
      System.out.println(response.getStatusLine());
      HttpEntity entity = response.getEntity();
      EntityUtils.consume(entity);
  } finally {
      response.close();
  }