How to convert between XML documents and JTree
XMLBecause of its good structure, it is widely used in the definition of document formats. We know that application software generally needs to use configuration file to determine some parameters during runtime. The configuration file of previous applications was generally an .ini file. Although ini files are still in use today, due to the emergence of XML, more and more commercial software is using XML as the configuration file format, such as BEA's Weblogic and IBM's Websphere. Therefore, when we design a software configuration file, we will increasingly consider using XML as the format of the configuration file.
Because configuration files sometimes must be modified by users, providing a visual format for editing configuration files is a reflection of the software's good user interactivity. We must find a visual method for XML documents. The JTree in the Swing component in the Java language is very suitable for the visualization of XML documents. There is a very convenient conversion method between the two. This means that we can easily display the user's operations on the JTree as modifications in the XML file after saving, and we can also conveniently display the XML file as a JTree to the user.
Visualization of XML documents
An XML document is actually a tree structure. For example, the following XML document:
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It can be seen that the XML document is the interface of a multi-interface program PictureConfiguration program. If the XML document is visualized, then JTree should be used What is obtained is the result shown in the figure below.
Figure Visualization results
All XML documents can generate such a Jtree. Using XML's Parser and the JTree class in Java, a general visual XML document can be constructed to form a JTree. The result of the XML document parsing by XML Parser is to generate a DOM (Document Object Model) tree. The structure of the DOM tree is actually the same as the structure of the JTree. , which makes the cooperation between JTree and XML Parser very natural. Here’s how to do it.
A class that reads and writes XML files
First you must obtain the XML Parser package, which can be obtained from the following address: http://xml.apache.org/xerces2-j/index. html.
Then design an XMLTree class, inherit from the definition and members of the JTree class variables , functions are defined as follows:
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where The initialization work done by the constructor is as follows:
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Among them, parseXml is a program that returns the root element of the XML file, as follows:
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The core part of LoadFile is a recursionThe process is as follows:
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You can easily make changes on the JTree using the methods in Java's Swing package. You can use the pop-up dialog box method, or you can make changes directly on the JTree. In short, after the JTree is changed, it needs to be written back to the file. Writing a JTree into an XML file is a recursive process. The method is as follows:
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It must be noted that if the XML file contains Chinese, then it needs to Before calling the above function, enter the encoding method of the XML file in the file as follows:
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After calling the function, you should also close the file as follows:
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Conclusion
XML files are widely used in configuration files and information transmission. There are many visualization methods. This article introduces one of the implementation methods by combining Java's JTree class. The good combination of Java language and XML makes it flexible and convenient to use Java to compile XML programs.
The above is the detailed content of How to convert between XML documents and JTree. For more information, please follow other related articles on the PHP Chinese website!

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