XML & XPath parsing

1.XML effect
   1.1 To configure  
   *.xml and *.properties、*.ini、*.yaml

   1.2 Data interaction （ Get third-party data ）
   XML：webservices（axis2） -> xml -> Where the mobile phone belongs 、 The weather
   JSON  ajax No refresh

2.Java in 3 Configuration position and reading mode
   2.1 How to use Properties Read configuration file
      1）*.properties Files store data as key value pairs ;
      2） Use Properties Class to read the configuration file ;
    

 

   2.2 Configuration location
      1） Stored in the root directory ,/ Representative acquisition src The absolute path to the root
      2） Stored in the same kind of bag , No addition / Represents the relative path under the package with the same name ;
      3） Stored in WEB-INF Under the table of contents

 

 

3.dom4j+xpath analysis xml file
    1）xpath Similar to select sentence ;
    2）Document With nodes （Node） form ： Element nodes 、 attribute 、 Text etc. ;
    3）selectNodes() Get all child nodes under the node ;
    4）selectSingleNodes() Get single node information ;
 
    

 

    5) xpath grammar ：/（ Positioning path ）、@（ get attribute ）