用Java解析XML文档

Question

I want to find the @name from table tag, from given col_alt . Can anybody help me with this. Is it possible with javax.XML.Xpath ? If not can you suggest the other way to find this.

This is the example of XML data:

<?xml version="1.0" encoding="UTF-8"?>
<mapping>
    <table name="CLIENT">
        <table_column>
            <column name="CLIENT_NAME">
                <col_alt>CLIENT_NAME</col_alt>
                <col_alt>CLIENT NAME</col_alt>
                <col_alt>NAME</col_alt>
                <col_alt>NAMES</col_alt>
                <col_alt>CUST NAME</col_alt>
                <col_alt>CUSTOMER NAME</col_alt>
            </column>
            <column name="CLIENT_ADDRESS">
                <col_alt>ADDRESS</col_alt>
                <col_alt>LIVES IN</col_alt>
                <col_alt>LOCATION</col_alt>
                <col_alt>STAY</col_alt>
            </column>
            <column name="CLIENT_CONTACT_NO">
                <col_alt>CONTACT NO</col_alt>
                <col_alt>CONTACT</col_alt>
            </column>
        </table_column>
    </table>
    <table name="SALES_MASTER">
        <table_column>
            <column name="SALE_DATE">
                <col_alt>SALE DATE</col_alt>
                <col_alt>BILL DATE</col_alt>
                <col_alt>SALES DATE</col_alt>
            </column>
            <column name="TOTAL_BILL">
                <col_alt>TOTAL BILL</col_alt>
                <col_alt>GRAND TOTAL</col_alt>
            </column>
        </table_column>
    </table>
</mapping>

Answer 1

If i remember correctly Xpath expression like this should work for you. I do not have complete code to give it a try.

XPathExpression expr = xpath.compile("//table/table_column/column[col_alt='SALE DATE']/@name");
Object result = expr.evaluate(doc, XPathConstants.NODESET);

NodeList nodes = (NodeList) result;
for (int i = 0; i < nodes.getLength(); i++) {
    System.out.println(nodes.item(i).getNodeValue());
}

doc - is the document reference of the xml.

Answer 2

Do you have a schema for the XML? If so can you check JAXB