Introduction to the

XML, short for Extensible Markup Language, is a data format used to express complex data structures and is often used to transfer and store data.

Such as:


      
<! DOCTYPEnote SYSTEM "book.dtd">
<book id="1">
    <name>Java Core Technology</name>
    <author>Cay S. Horstmann</author>
    <isbn lang="CN">1234567</isbn>
    <tags>
        <tag>Java</tag>
        <tag>Network</tag>
    </tags>
    <pubDate/>
</book>
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Features:

  • Plain text
  • The default encoding is UTF-8

Common special characters are as follows

character said
< <
> >
& &
“ “
‘ ‘ 
<books>
   <book sn="SN123124">
       <name>A brief history of time</name>
       <author>Hawking</author>
       <price>75</price>
   </book>
   <book sn="SN12fds3124">
       <name>Java from entry to abandonment</name>
       <author>Mr Wu</author>
       <price>7</price>
       <text><! [CDATA[ fdsjlfsdfjdsl..mm.,<><><> ]]></text>
   </book>
</books>
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XML parsing

Both XML and HTML are markup documents that follow THE W3C’s DOM technology for parsing

The Document object represents the entire document and can be in a markup language such as HTML or XML

The early JDK gave us parsing techniques DOM and Sax (obsolete)

Third party analysis:

  • Jdom dom based encapsulation
  • Dom4j encapsulates JDOM
  • Pull is mainly Android mobile phone development and is based on event parsing like SAX

Concrete class library reference