apache.commoms.digester3 解析xml文件
Technorati 标签: java,xml,digester,xmlrule,FromXmlRulesModule1 简介java解析xml，就个人所知有3种方法DOM、SAX和Digester。前两种需要编写大量代码，且不利于代码移植和复用；
Digester解析xml又有两种方式，代码和xmlrule。xmlrule方式读取规定格式的xml解析规则文件，将标签和属性值赋值到指定的Java POJO对象。
2 待解析的xml文件
10.00000000
10.00000000
10.00000000
20.00000000
20.00000000
20.00000000
30.00000000
30.00000000
30.00000000
40.00000000
40.00000000
40.00000000
3 解析规则文件
4 存贮解析结果的Java POJO
package xml.digester;
import java.util.Vector;
public class Bound{
private Vector pts = new Vector();
public void addPt(GeoPt pt){
pts.add(pt);
}
public Vector getPt(){
return pts;
}
}
package xml.digester;
public class GeoPt{
public double dX;
public double dY;
public double dZ;
public double getdX() {
return dX;
}
public void setdX(double dX) {
this.dX = dX;
}
public double getdY() {
return dY;
}
public void setdY(double dY) {
this.dY = dY;
}
public double getdZ() {
return dZ;
}
public void setdZ(double dZ) {
this.dZ = dZ;
}
}
注意：
[*]
类成员变量名不可为X、Y、Z，否则digester报错，原因不明。
[*]可以先定义成员变量，然后用MyEclipse工具“生成setter和getter函数”
5 xmlrule文件加载类
package xml.digester;
import java.io.File;
import org.apache.commons.digester3.xmlrules.FromXmlRulesModule;
public class myRulesLoader extends FromXmlRulesModule
{
private String xmlrule;
public myRulesLoader(String xmlfile){
xmlrule = xmlfile;
}
@Override
protected void loadRules()
{
loadXMLRules( new File( xmlrule ) );
}
}
6 运行示例
public static void main(String[] args){
try {
// 加载xmlrule文件
DigesterLoader loader = newLoader(new myRulesLoader("d:\\drule3.xml"));
// 创建Digester实例
Digester digester = loader.newDigester();
// 解析xml文件
FileInfo info = (FileInfo) digester.parse(new File("d:\\9.xml"));
// 分析解析结果
info.show();
}
catch (Exception e){
e.printStackTrace();
}
}
7 结果示意
...
Name: Band_1KM_Emissive
Fname: G:\YX\HDF_NC_H5\MOD021KM.A2009345.0400.005.2010257180913.hdf
Description: 1KM Emissive Band Numbers for Subsetting
NS: 16
NL: 1
NB: 1
FileType: HDF4
DataType: FLOAT
Satellite:null
Sensor:null
picPath:
xyz: 0.00.00.0
xyz: 0.00.00.0
xyz: 0.00.00.0
xyz: 0.00.00.0
...
页:
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