Java爬虫--HttpClient-Post请求

//下面是一个demo：

package test;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import  org.apache.http.client.methods.HttpPost;
import java.io.IOException;

public class HttpPost1 {
    public static void main(String[] args) {
        //1.打开浏览器
        CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpPost httpPost=new HttpPost("https://www.itcast.cn");
        //2.输入网址
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == 200) {
                HttpEntity entity = response.getEntity();
                String s = EntityUtils.toString(entity, "utf-8");
                System.out.println(s);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }
}