从XML元素结构到JAVA实现
2024-07-13 09:54:52
供稿:网友
前几个月,做项目时整理过一些xml操作的程序。这里根据自己的编程习惯再做一下整理。xml操作最基本的是sax,dom了。但这里不是谈sax,dom怎么使用。而是从xml元素的角度谈其java的实现。xml是由多个元素组成,可以分成xmlelement、xmlsimpleelement、xmlcomplexelement、xmlcollection、xmlcollectionelement等几种基本类型,从类名你基本就可以判断出该类所描述的xml对象了。
下面以一个例子来做描述:
<?xml version="1.0" encoding="gb2312"?>
<package name = "abc">
<file name = "file">
<sheet name = "sheet">
<styles>
<style id = "0" name = "a">
<align>2</align>
<borders>
<border id = "0" type = "left" value = "1" />
<border id = "1" type = "right" value = "3" />
</borders>
<font name = "宋体" color = "3" height = "20" />
</style>
</styles>
<columns>
<column id = "0" columnid = "0" width = "10" />
</columns>
<regions>
<region id = "0" rowid = "1" columnform = "0" columnto = "3" />
</regions>
<cells>
<cell id = "1" row="0" column = "0" style = "a" value ="测试"/>
<cell id = "2" row="2" column = "2" value =" 测试2" />
</cells>
</sheet>
</file>
</package>
该配置文件是个xml—>excel的xml文件,描述了excel中的一些对象,比如文件名,字体,行,列等。其中package是一个xmlcomplexelement(混合类型),cells(单元格集)是个xmlcollection(容器类),cell (单元格)是xmlcollectionelement(容器中的元素)<cell id = "1" row="0" column = "0" style = "a" value ="测试"/>
中的id 就是xmlattribute(属性)。所有的xml文件都是由这些基本的元素组成。定义出最基本的xml元素后,那么在程式中怎么也把它们之间的关系定义出来呢?以cell元素为例子代码如下:
public class cell extends xmlcollectionelement {
private xmlattribute attrrow=new xmlattribute("row");
private xmlattribute attrstyle=new xmlattribute("style");
private xmlattribute attrcolumn=new xmlattribute("column");
private xmlattribute attrvalue=new xmlattribute("value");
private xmlinterface xmlinterface = null ;
public cell (cells ass) {
super(ass);
fillstructure();
}
protected void fillstructure() {
super.fillstructure();
attrid.setreadonly(true);
isrequired=true;
complexstructure.add(attrstyle);
complexstructure.add(attrrow);
complexstructure.add(attrcolumn);
complexstructure.add(attrvalue);
}
}
源代码下载 http://www.51sports.org/xml.rar