网络爬虫

         //1.打开浏览器,创建HTTPClient对象对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        //2.输入网址,创建get请求,创建HTTPGet对象
        HttpGet httpGet = new HttpGet("http://www.itcast.cn");

        //3.按回车,发起请求,返回响应,使用HTTPClient对象发起请求
        CloseableHttpResponse response = httpClient.execute(httpGet);

        //4.解析响应,获取数据
        //判断状态码是否是200
        if(response.getStatusLine().getStatusCode() == 200){
            HttpEntity httpEntity= response.getEntity();
            String content = EntityUtils.toString(httpEntity, "utf-8");

            System.out.println(content);
　　　　　　　}