Java使用Jsoup解析网页

       jsoup 是一款Java 的HTML解析器，可直接解析某个URL地址、HTML文本内容。它提供了一套非常省力的API，可通过DOM，CSS以及类似于jQuery的操作方法来取出和操作数据。

      下面是我在开发中通过Jsoup解析网页两种通用方法。

     1. 获取单个元素

   /**

    * 根据path获取单个元素

    *

    * @param element

    * @param path
: [id=idstr]>[class*=classstr]>span#5>a

    * @return

    */

   public static Element
getElementByPath(Element element, String path){

      if(element
== null){

          return null;

      }

      if(path
== null || "".equals(path)){

          return null;

      }

      if(path.contains(">")){

          String[] paths = path.split(">");

          if(paths
!= null &&
paths.length > 0){

             for(String
p : paths){

                element = getElementByPath(element,
p);

                if(element
== null){

                   break;

                }

             }

          }

      }else{

          int index
= 0;

          String p = path;

          if(path.contains("#")){

             p = path.substring(0, path.indexOf("#"));

             String indexstr = path.substring(path.indexOf("#")+1).replace("[^0-9]", "");

             if(!"".equals(indexstr)){

                index = Integer.valueOf(indexstr);

             }

          }

          Elements elements = element.select(p);

          if(index
> 9999){

             element = elements.last();

          }else{

             if(elements.size()
<= index){

                return null;

             }

             element = elements.get(index);

          }

      }

      return element;

   }

  

   2. 获取多个元素

   /**

    * 根据path获取多个元素

    *

    * @param element

    * @param path
: [id=idstr]>[class*=classstr]>span#5>a

    * @return

    */

   public static Elements
getElementsByPath(Element element, String path){

      if(element
== null){

          return null;

      }

      if(path
== null || "".equals(path)){

          return null;

      }

      Elements elements = null;

      if(path.contains(">")){

          String[] paths = path.split(">");

          if(paths
!= null &&
paths.length > 0){

             for(String
p : paths){

                elements = getElementsByPath(element,
p);

                if(elements
== null){

                   break;

                }

                int index
= 0;

                if(p.contains("#")){

                   String indexstr = p.substring(p.indexOf("#")+1).replace("[^0-9]", "");

                   p = p.substring(0, p.indexOf("#"));

                   if(!"".equals(indexstr)){

                      index = Integer.valueOf(indexstr);

                   }

                }

                if(index
> 9999){

                   element = elements.last();

                }else{

                   if(elements.size()
<= index){

                      elements = null;

                      break;

                   }

                   element = elements.get(index);

                }

             }

          }

      }else{

          String p = path;

          if(path.contains("#")){

             p = path.substring(0, path.indexOf("#"));

          }

          elements = element.select(p);

      }

      return (elements
!= null &&
elements.size() > 0) ? elements : null;

   }