学步园

在工作中，调用第三方接口时，会解析不同的xml格式，解析xml的方式有很多，但是Digester比较简单，以下是我遇到的几种情况：

第一种情况：input=

<channel id="1" code="AHTV1" name="安徽卫视" short_name="安徽卫视" country_code="CN" 
station_code="AHTV"/>

解析： Digester digester = new Digester();
             digester.setValidating(false);
             digester.push(this);
             digester.addObjectCreate("document/metainfo",
channelInfo.class);//channelInfo.class是对应的实体类；

             digester.addSetProperties("document/metainfo", "id", "id");
             digester.addSetProperties("document/metainfo", "name", "name");

            
digester.addSetNext("document/channel", "addChannelInfo");//addChannelInfo是下面一个方法，将对象放到一个集合中；

  
             digester.parse(new ByteArrayInputStream(input.getBytes()));

             public void addChannelInfo(TvMaoChannelInfo channelInfo) {
                 channelInfos.add(channelInfo);
             }

第二种情况：input=

<document><metainfo><id>ec19cb38f57fb3a0</id><name>旋转的爱</name></metainfo></document>

解析：Digester digester = new Digester();           

            digester.addObjectCreate("document/metainfo", ColumnMetaInfo.class);
            digester.addBeanPropertySetter("document/metainfo/id", "id");
            digester.addBeanPropertySetter("document/metainfo/name", "name");

            ColumnMetaInfo columnMetaInfo = (ColumnMetaInfo) digester.parse(new ByteArrayInputStream(input.getBytes()));

第三种情况：接受的xml中，第二种情况中，包含集合的：

Digester digester = new Digester();

        digester.addObjectCreate("document", DramaInfo.class);//实体类
        digester.addObjectCreate("document/metainfo", DramaMetainInfo.class);//实体类

        digester.addBeanPropertySetter("document/metainfo/id", "id");
        digester.addBeanPropertySetter("document/metainfo/name", "name")
        digester.addSetNext("document/metainfo", "setDramaMetainInfo");//将DramaMetainInfo对象set到DramaInfo中

        digester.addObjectCreate("document/episodes/section", DramaSection.class);//实体类
        digester.addSetProperties("document/episodes/section", "number", "number");
        digester.addBeanPropertySetter("document/episodes/section", "content");
        digester.addSetNext("document/episodes/section", "addEpisodes");//将DramaSection放到集合中，并将集合set到DramaInfo中

        digester.addObjectCreate("document/pictures/url", ImageInfo.class);//实体类
        digester.addBeanPropertySetter("document/pictures/url", "url");
        digester.addSetNext("document/pictures/url", "addImageInfo");/将ImageInfo放到集合中，并将集合set到DramaInfo中

           DramaInfo dramaInfo = (DramaInfo) digester.parse(new ByteArrayInputStream(input.getBytes()));

其中：DramaInfo.class中包含DramaMetainInfo属性，DramaSection集合，ImageInfo集合