在Java中使用Xpath从大型xml文件中提取值

Question

I would like to extract a single value from a large xml file (part of a much larger xml project that I'm working on)

So the xml structure is like this:

<m:Report>
    <m:Messages>
        <m:report_type>
            <m:Report_Data> (last value)
                <m:Data_Item> (must be specific type)
                <m:Value> (want this)

After this all tags close properly

So right xpath query looks something like this:

XPathExpression expr = x.compile("//m:Report/m:Messages/m:Report_type/m:Report_Data[m:Data_Iten='PRICE'][last()]/m:Value/text()") ;

I'm not having much luck with this query, where am I going wrong?

Answer 1

There are simply errors in your query. Report_type should be report_type and Data_Iten should be Data_Item :

XPathExpression expr = x.compile("//m:Report/m:Messages/m:report_type/m:Report_Data[m:Data_Item='PRICE'][last()]/m:Value/text()");

Assuming that you have a Data_Item in your input data with PRICE , then this should get you the <m:Value> .