引用
xpath可以快速定位获取XML文件中指定属性和值,jdk包含拉所有需要的类
1. 帮助类
public class XpathUtil { private static final Log logger = LogFactory.getLog(XpathUtil.class.getName()); private Document doc; public XpathUtil(File file) { DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance(); domFactory.setIgnoringElementContentWhitespace(true); domFactory.setNamespaceAware(false); try { DocumentBuilder builder = domFactory.newDocumentBuilder(); this.doc = builder.parse(file); } catch (Exception e) { e.printStackTrace(); } } public List<String> getValuesByXpath(String expString) { List<String> values = new ArrayList<String>(); try { String expArray[]= expString.split(Constants.COMMA); for(String exp :expArray){ XPath xpath = XPathFactory.newInstance().newXPath(); XPathExpression expr = xpath.compile(exp); Object result = expr.evaluate(this.doc, XPathConstants.NODESET); NodeList nodes = (NodeList) result; for (int i = 0; i < nodes.getLength(); i++) { String nodeValue = nodes.item(i).getTextContent(); values.add(nodeValue); } } } catch (XPathExpressionException e) { logger.error("", e); } catch (DOMException e) { logger.error("", e); } return values; } }
2. XML Sample
<?xml version="1.0" encoding="UTF-8"?> <p:ProcessLifeCycle xmlns:p="http://www.example.org/draft_2/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.org/draft_2/ metaData.xsd "> <TableList> <Table> <name>tab.eq_exec_detail</name> <p:CommonRefAttrElem> <name>table_name</name> <value>eq_exec_detail</value> </p:CommonRefAttrElem> <p:CommonRefAttrElem> <name>primary_key</name> <value>exec_did</value> </p:CommonRefAttrElem> <p:CommonRefAttrElem> <name>record</name> <record> <name>rec.eq_exec_detail</name> <description>exec detail record in ocean format. Table tab.eq_exec_detail</description> <p:CommonRefAttrElem> <name>exec_did</name> <type>bigint</type> <length>8</length> <value>not_possdup</value> <nullFlag>N</nullFlag> </p:CommonRefAttrElem> <p:CommonRefAttrElem> <name>sys_exec_ver</name> <type>integer</type> <length>4</length> <value>possdup</value> <nullFlag>Y</nullFlag> </p:CommonRefAttrElem> <p:CommonRefAttrElem> <name>side</name> <type>varchar</type> <length>20</length> <value>possdup</value> <nullFlag>Y</nullFlag> </p:CommonRefAttrElem> </record> </p:CommonRefAttrElem> </Table> </TableList> </p:ProcessLifeCycle>
3. 测试类
public class XpathUtilTest { @Test public void testRetrieveXpath() throws Exception { XpathUtil util = new XpathUtil(new File("test.xml")); List<String> values = util.getValuesByXpath("//TableList/Table/CommonRefAttrElem/record/CommonRefAttrElem/name"); System.out.println(values); } }
输出
引用
[exec_did, sys_exec_ver, side]
4. xpath获取eclipse插件,解压到dropin文件夹。
http://code.google.com/p/eclipse-xpath-evaluation-plugin/downloads/detail?name=eclipse-xpath-evaluation-plugin-1.2.3.zip
点击xml节点,可以获取XPATH