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   源码介绍

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package test;

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 CrawlerFirst {
    public static void main(String[] args) throws Exception {
        //打开浏览器
        CloseableHttpClient httpClient = HttpClients.createDefault();

        //输入网址
        HttpGet httpGet = new HttpGet("http://www.itcast.cn");


        //按回车发起请求
        CloseableHttpResponse response = httpClient.execute(httpGet);
        //解析响应 获取数据

        //判断状态码
        if(response.getStatusLine().getStatusCode() == 200){
            HttpEntity httpEntity = response.getEntity();
            String content = EntityUtils.toString(httpEntity,"utf-8");

            System.out.println(content);
        }
    }
}