HttpClient 发送GET请求

API说明

用 HttpClientBuilder 创建 CloseableHttpClient 实例。

在 HttpClient 新的版本中， AbstractHttpClient、 AutoRetryHttpClient、 DefaultHttpClient等都被弃用了，使用HttpClientBuilder代替

示例代码：

public class HttpClientTest {
    public static void main(String args[]) {
        //创建HttpClientBuilder
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        //HttpClient
        CloseableHttpClient closeableHttpClient = httpClientBuilder.build();

        HttpGet httpGet = new HttpGet("http://www.gxnu.edu.cn/default.html");
        System.out.println(httpGet.getRequestLine());
        try {
            //执行get请求
            HttpResponse httpResponse = closeableHttpClient.execute(httpGet);
            //获取响应消息实体
            HttpEntity entity = httpResponse.getEntity();
            //响应状态
            System.out.println("status:" + httpResponse.getStatusLine());
            //判断响应实体是否为空
            if (entity != null) {
                System.out.println("contentEncoding:" + entity.getContentEncoding());
                System.out.println("response content:" + EntityUtils.toString(entity));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //关闭流并释放资源
                closeableHttpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}