创建xmlDom后加上“xmlDom.setProperty('SelectionLanguage','XPath');
xPath查询如：等值查询：String xPath = "users/user[username='huo' and password='123']";模糊查询：String xPath = "users/user[contains(username,'huo') and contains(password,'123')]";
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XML第二种存储方式 .xml
xPath查询如：加"@" 用以查询属性值等值查询：String xPath = "users/user[@username='huo' and @password='123']";模糊查询：String xPath = "users/user[contains(@username,'huo') and contains(@password,'123')]";