要在巨大的xml文件中执行XPATH查询,我阅读了许多文章,这些文章优先选择VTD-XML,因此我复制了这些文章中的代码:
import com.ximpleware.extended.*;
public class MainVTD {
public static void main(String[] s) throws Exception{
VTDGenHuge vg = new VTDGenHuge();
if (vg.parseFile("./resource/init/dblp_3.xml",true,VTDGenHuge.MEM_MAPPED)){
VTDNavHuge vnh = vg.getNav();
AutoPilotHuge aph = new AutoPilotHuge(vnh);
aph.selectXPath("/*/*[not(name() = name(preceding-sibling::*[1]))]");
int i ;
while ((i=aph.evalXPath())!=-1){
System.out.println(" element name is "+vnh.toString(i));
}
}else System.out.println("Doc not mapped");
}
}
但是当我运行它没有结果时,所以它的平均XML文件没有映射到内存中...... 我的问题是我如何强制在VTD-XML中映射xml文件?
答案 0 :(得分:0)
将以下代码放入并打印出异常以查看错误...
import java.io.IOException;
import com.ximpleware.extended.*;
public class testExtendedVTD {
public static void main(String s[]){
VTDGenHuge vgh = new VTDGenHuge();
XMLBuffer xb = new XMLBuffer(); //or XMLMemeMappedBuffer
try {
xb.readFile("test.xml");
vgh.setDoc(xb);
} catch (ParseExceptionHuge e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}