HttpClient基本功能的使用Get方式

HttpClient是一个开源的Java HTTP客户端库，可以发送HTTP请求，并接收HTTP响应。

使用HttpClient发送GET请求的基本步骤如下：

1. 创建HttpClient对象：

CloseableHttpClient httpClient = HttpClients.createDefault(); 

2. 创建HttpGet对象，并设置请求的URL：

HttpGet httpGet = new HttpGet("http://www.example.com"); 

3. 执行GET请求并获取响应：

CloseableHttpResponse response = httpClient.execute(httpGet); 

4. 解析响应：

• 获取响应状态码：

int statusCode = response.getStatusLine().getStatusCode(); 

• 获取响应内容：

HttpEntity entity = response.getEntity(); String responseContent = EntityUtils.toString(entity, "UTF-8"); 

5. 关闭HttpClient和HttpResponse：

response.close(); httpClient.close(); 

完整的示例代码如下：

import org.apache.http.HttpEntity; import org.apache.http.client.methods.CloseableHttpResponse; 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; public class HttpClientDemo { public static void main(String[] args) throws Exception { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpGet httpGet = new HttpGet("http://www.example.com"); CloseableHttpResponse response = httpClient.execute(httpGet); try { int statusCode = response.getStatusLine().getStatusCode(); HttpEntity entity = response.getEntity(); String responseContent = EntityUtils.toString(entity, "UTF-8"); System.out.println("Status Code: " + statusCode); System.out.println("Response Content: " + responseContent); } finally { response.close(); } httpClient.close(); } } 

以上代码发送一个GET请求到http://www.example.com，并输出响应状态码和响应内容。