Question

我有一个巨大的xml，我需要找到支付金额并对应billID。

我只是想出了如何选择正确的数量（使用CellText =＆＃39;数量＆＃39;定位距细胞2个细胞）。我可以打印这个，它可以工作。

现在我还需要打印相应的billID。我该怎么做？

这是我正在使用的XML类型的示例：

<Section>
<Item>
    <TableRow>
        <Cell>
           <RowNo>4</RowNo>
           <CellColNo>1</CellColNo>
           <CellText>amount</CellText>
           <CellAttribute/>
        </Cell>
        <Cell>
           <RowNo>4</RowNo>
           <CellColNo>2</CellColNo>
           <CellText/>
           <CellAttribute/>
        </Cell>
        <Cell>
           <RowNo>4</RowNo>
           <CellColNo>3</CellColNo>
           <CellText>138</CellText>
           <CellAttribute/>
        </Cell>
    </TableRow>
</Item>
<Item>
    <BillID>123456</BillID>
</Item>
</Section>
<Section>
...
</Section>

这是我的代码，我需要添加billID也应该打印：

XPath xPath =  XPathFactory.newInstance().newXPath();
String exprString = "//TableRow/Cell[CellText='amount:']/following-sibling::cell[2]CellText/text()";
XPathExpression expr = xPath.compile(exprString);

    Object result = expr.evaluate(doc, XPathConstants.NODESET);
    NodeList nodes = (NodeList) result;
    for (int j = 0; j < nodes.getLength(); j++) {
        System.out.println(nodes.item(j).getNodeValue());
    }

（我知道XML没有意义，它只是为了说明格式。还有几个＆＃34;章节＆＃34;，所以我需要确保选择正确的！）。提前谢谢！

Answer 1

如果您想同时获得两个String，则可以使用以下XPath表达式应用节点统一运算符|相对于假设的root节点：

/root/Section/Item/TableRow/Cell/CellText[text()='amount']/parent::Cell/following-sibling::Cell[2]/CellText/text() | /root/Section/Item/BillID/text()

可以检查here at XPathFiddle。这导致

138
123456

Answer 2

这个代码片段可以做到。从您选择金额的节点中，找到祖先Item节点，转到下一个兄弟并选择BillID文本。一旦选择了金额，它将使用以下XPath：

ancestor::Item[1]/following-sibling::Item[1]/BillID/text()

import java.io.StringReader;
import javax.xml.xpath.*;
import org.w3c.dom.*;
import org.xml.sax.InputSource;

public class GetTheBillId {
    private static final String xml1=
"<root>"+
"<Item>"+
"    <TableRow>"+
"        <Cell>"+
"           <RowNo>4</RowNo>"+
"           <CellColNo>1</CellColNo>"+
"           <CellText>amount</CellText>"+
"           <CellAttribute/>"+
"        </Cell>"+
"        <Cell>"+
"           <RowNo>4</RowNo>"+
"           <CellColNo>2</CellColNo>"+
"           <CellText/>"+
"           <CellAttribute/>"+
"        </Cell>"+
"        <Cell>"+
"           <RowNo>4</RowNo>"+
"           <CellColNo>3</CellColNo>"+
"           <CellText>138</CellText>"+
"           <CellAttribute/>"+
"        </Cell>"+
"    </TableRow>"+
"</Item>"+
"<Item>"+
"    <BillID>123456</BillID>"+
"</Item>"+
"</root>";

    private static final String xpathExpr1=
"//TableRow/Cell[CellText='amount']/following-sibling::Cell[2]/CellText/text()";

    private static final String xpathExpr2=
"ancestor::Item[1]/following-sibling::Item[1]/BillID/text()";   

    public static void main(String[] args) {
        try {
            XPath xpath = XPathFactory.newInstance().newXPath();
            XPathExpression expr1 = xpath.compile(xpathExpr1);
            XPathExpression expr2 = xpath.compile(xpathExpr2);
            NodeList nodeList = (NodeList) expr1.evaluate(new InputSource(new StringReader(xml1)),XPathConstants.NODESET);
            StringBuilder sb = new StringBuilder();
            for( int i = 0; i != nodeList.getLength(); ++i ) {
                Node n = (Node) nodeList.item(i);
                sb.append( "Amount=" ).append(n.getNodeValue());

                Node billId = (Node) expr2.evaluate(n,XPathConstants.NODE); // search for Bill ID
                sb.append("; BillId=").append(billId.getNodeValue());
                sb.append(System.lineSeparator());
            }
            System.out.println(sb.toString());
        } catch (XPathExpressionException e) {
            e.printStackTrace();
        }
    }
}

输出：

Amount=138; BillId=123456

xPath检索多个值

2 个答案: