public static void main(String[] args) throws Exception{

        // 创建httpClient实例

        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 创建httpGet实例

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

        httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0");

        CloseableHttpResponse response = httpClient.execute(httpGet);

        String content = null;

        if(response != null){

            HttpEntity entity = response.getEntity();

            content = EntityUtils.toString(entity, "UTF-8");  // 获取网页内容

            Document document = Jsoup.parse(content);  // 解析网页，得到文档对象

            // 1.查找所有帖子DOM

            Elements elements = document.select(".post_item .post_item_body h3 a");

            for(Element ele : elements){

                System.out.println("博客标题：" + ele.text());

            }

            System.out.println("------------------------分割线------------------------");

            // 2.查找带有href属性的a元素

            Elements hrefElements = document.select("a[href]");

            for(Element ele : hrefElements){

                System.out.println(ele.toString());

            }

            System.out.println("------------------------分割线------------------------");

            // 3.查找扩展名为.png的图片DOM节点

            Elements imgElements = document.select("img[src$=.png]");

            for(Element ele : imgElements){

                System.out.println(ele.toString());

            }

            System.out.println("------------------------分割线------------------------");

            // 4.获取tag为title的第一个DOM元素

            Element titleEle = document.getElementsByTag("title").first();

            System.out.println("标题为：" + titleEle.text());

        }

        if(response != null){

            response.close();

        }

        if(httpClient != null){

            httpClient.close();

        }

    }