Create an XML editor using Java Swing (1)

I think you must have some understanding of xml. Maybe you are still eager to write an XML text, but there are too few cross-platform, free XML editors available now. So in this article, I want to introduce or take you step by step to develop a simple XML editor. Of course, we will use some of the most common Java 2 Swing components, but these are all free, and some are in the JDK , some can be downloaded from the Internet. I think through this article, you can create an XML editor of your own.
　

　 Let me first introduce the idea of ​​​​writing this article. First I want to briefly discuss XML and why tree structures are suitable for displaying XML. Then we will look at how the JAXP API sets up the required XML class environment. Then we will look at JTree for displaying a graphical tree. Swing component; finally, we will create a reusable class that continues the JTree component and can be used to parse an XML document and display the data in a Jtree.

　 When it comes to XML (eXtensible Markup Languge), people often think of it as a new markup language used in web browsers, just like Html or CSS. In fact, XML is a data representation language that allows you to use a very efficient way to describe your data. XML enables you to define statements such as "these three Words constitutes a heading." XML allows you to declare any type of data, rather than displaying the data in a web page.

　 Please take a look at the following XML example:

＜article＞
＜header＞
＜title＞ Create an XML editor using Java Swing
＜suBTitle＞ Part 1＜/subtitle＞
＜/title＞
＜author ＞ Wayne ＜/author＞
＜header＞
＜content＞ This is the text ＜/content＞
＜/article＞

Please note that these elements are different from standard HTML statements, but they look more like HTML. This is because both XML and HTML are derived from the SGML language. The difference is that HTML has a predefined set of tags, while XML's syntax has a lot of flexibility, allowing you to use expressive tags such as to surround the data. You should also note that all elements are subordinate to the root element (

in the above example), and some elements have their own sub-elements, such as which is a sub-element of

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