Jsoup（一）-- HelloWorld

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.10.3</version>
</dependency>

    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
            
            Elements elements = document.getElementsByTag("title"); // 获取 tag为 title的DOM元素
            Element element = elements.get(0); // 获取第一个DOM元素
            String title = element.text();  // 返回元素的文本
            System.out.println("博客园的标题：" + title);
            
            Element element2 = document.getElementById("site_nav_top");
            String navTop = element2.text();
            System.out.println("座右铭：" + navTop);
        }
        if(response != null){
            response.close();
        }
        if(httpClient != null){
            httpClient.close();
        }
    }