1.参考 w3c.school或者xpath https://www.cnblogs.com/vastsum/p/5940235.html
2.dom读取 参考 https://blog.51cto.com/13479739/2313218
3.xpath需要的包
<!-- https://mvnrepository.com/artifact/jaxen/jaxen xpath使用的包-->
<dependency>
<groupId>jaxen</groupId>
<artifactId>jaxen</artifactId>
<version>1.1.6</version>
</dependency>
//dom4j读取xml
public static void dom4jReadXml(){
String sourcePath = "X:\\sofa_home\\global\\datasources.xml";
File file = new File(sourcePath);
SAXReader saxReader = new SAXReader();
try {
//需要加上包名，否则会自动识别dom包
org.dom4j.Document read = saxReader.read(file);
Element rootElement = read.getRootElement();
//获得所有节点值
System.out.println("》》》》》》》rootElement.getStringValue():"+rootElement.getStringValue());
System.out.println("rootElement.getText()"+rootElement.getText());
//获得所有子节点
List<Element> elements = rootElement.elements();
for (Element element : elements) {
//getStringValue是该节点所有子孙节点的文本值
System.out.println(element.getStringValue());
//节点名称<datasource>这个名字
System.out.println(">>>>>>element:"+element.getName());
System.out.println(">>>>>>element:"+element.getNodeTypeName());
List<Attribute> attributes = element.attributes();
for (Attribute attribute : attributes) {
//元素属性: <datasource id="sofa" enabled="true" dbType="ORACLE" connectType="0" dsType="hik">
//属性名和属性值
System.out.println("attribute.gename:"+attribute.getName());
System.out.println("attribute.gename:"+attribute.getValue());
}
}
} catch (DocumentException e) {
e.printStackTrace();
}
}
//dom4j通过xpath读取xml中的任意节点
public static void dom4jAndXpathReadXml(){
String sourcePath = "X:\\sofa_home\\global\\datasources.xml";
File file = new File(sourcePath);
//相对路径，不分结构层次，拿所有url节点的
String xpath = "//testQuery";
SAXReader saxReader = new SAXReader();
try {
org.dom4j.Document document = saxReader.read(file);
//读节点在Java中使用xpath方法，主要有两点：
//List<Node> selectNodes("xpath表达式"); 查询多个节点对象,一般使用多节点方法，查出的是Element，
// 可以获得属性等，可选项比较多
//Node selectSingleNode("xpath表达式"); 查询一个节点对象
List<Element> list = document.selectNodes(xpath);
for (Element o : list) {
System.out.println(o.getName());
System.out.println(o.getText());
o.attributes();
}
//如果有多个匹配，则只去第一个匹配到的
Node node = document.selectSingleNode(xpath);
System.out.println("单节点读取："+node.getText());
//绝对路径，表示从跟路径或者子元素开始，一个层次结构,不读取孙元素
//取根路径下的url元素,*是通配符，表示datasource里所有的元素
String absolutePath = "/datasources/datasource/*";
List<Element> list1 = document.selectNodes(absolutePath);
for (Element element : list1) {
System.out.print(element.getName()+"-----");
System.out.println(element.getText());
}
//[]表示选择条件 @表示属性标签,带有id属性的节点,包括父节点本身
String xpath1 = "/datasources/*[@id]";
List<Element> list2 = document.selectNodes(xpath1);
System.out.println(">>>>>>>>>>>>>>>>>带有id属性的节点>>>>>>>>>>>>>>..");
for (Element element : list2) {
System.out.println(element.getName());
List<Attribute> attributes = element.attributes();
for (Attribute attribute : attributes) {
System.out.println(attribute.getName()+"_______-");
System.out.println(attribute.getValue());
}
}
//查找没有enabled属性的节点
String xpath3 = "//datasource/*[not(@enabled)]";
System.out.println("》》》》》》》》》没有enabled属性的节点》》》》》》》》》》》》");
List<Element> list3 = document.selectNodes(xpath3);
//*只能用来匹配元素节点，而不能匹配文本
//text()，表示文本值,返回datasource下所有子节点的文本值，返回的是Text对象
String xpath4 = "//datasource/*/text()";
//通过对文本值模糊查询选择节点,查询节点下所有文本值中含有oracle字符串的节点
String xpath5 = "//datasource/*[contains(text(),'Driver')]";
List<Element> list5 = document.selectNodes(xpath5);
System.out.println(">>>>>>>>>>>>>>>>测试text()模糊查询>>>>>>>>>>>");
System.out.println(">>>>>>>>>>>>>>直接读取某一节点>>>>>>>>>>>>>>>>>>>>>>..");
Node node1 = document.selectSingleNode("//datasource/poolProperties/minPoolSize");
System.out.println(">>>>>>>>>>>读取孙节点>>>>>>>>>>>>>>>>>>>..");
List<Element> list4 = document.selectNodes("//datasource/*/*");
} catch (DocumentException e) {
e.printStackTrace();
}
}
//方式1 w3c.DOM的方式读取
public static void domReadXml(){
String sourcePath = "X:\\sofa_home\\global\\datasources.xml";
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
try {
File file =new File(sourcePath);
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = null;
try {
document = documentBuilder.parse(file);
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
NodeList datasource = document.getElementsByTagName("datasource");
for (int i =0;i<datasource.getLength();i++) {
String username = document.getElementsByTagName("username").item(i).getFirstChild().getNodeValue();
System.out.println("用户名："+username);
String password = document.getElementsByTagName("password").item(i).getFirstChild().getNodeValue();
System.out.println("密码："+password);
}
} catch (ParserConfigurationException e) {
e.printStackTrace();
}
}
上面测试读取的xml文件
<?xml version="1.0" encoding="UTF-8"?>
<datasources>
<datasource id="sofa" enabled="true" dbType="ORACLE" connectType="0" dsType="hik">
<driverClassName>oracle.jdbc.OracleDriver</driverClassName>
<url><![CDATA[jdbc:oracle:thin:@127.0.0.1:1521/orcl]]></url>
<username>sofa</username>
<password>YWNz__CK_</password>
<poolProperties>
<minPoolSize>0</minPoolSize>
<maxPoolSize>600</maxPoolSize>
<maxIdleTime>60</maxIdleTime>
<acquisitionTimeout>60</acquisitionTimeout>
<shareTransactionConnections>false</shareTransactionConnections>
<acquireIncrement>2</acquireIncrement>
<deferConnectionRelease>true</deferConnectionRelease>
<testQuery>SELECT 1 FROM DUAL</testQuery>
</poolProperties>
</datasource>
<datasource id="acs" enabled="true" dbType="ORACLE" connectType="0" dsType="hik">
<driverClassName>oracle.jdbc.OracleDriver</driverClassName>
<url><![CDATA[jdbc:oracle:thin:@127.0.0.1:1521/orcl]]></url>
<username>sofa</username>
<password>YWNz__CK_</password>
<poolProperties>
<minPoolSize>0</minPoolSize>
<maxPoolSize>600</maxPoolSize>
<maxIdleTime>60</maxIdleTime>
<acquisitionTimeout>60</acquisitionTimeout>
<shareTransactionConnections>false</shareTransactionConnections>
<acquireIncrement>2</acquireIncrement>
<deferConnectionRelease>true</deferConnectionRelease>
<testQuery>SELECT 1 FROM DUAL</testQuery>
</poolProperties>
</datasource>
<datasource id="fundacc" enabled="true" dbType="ORACLE" connectType="0" dsType="hik">
<driverClassName>oracle.jdbc.OracleDriver</driverClassName>
<url><![CDATA[jdbc:oracle:thin:@127.0.0.1:1521/orcl]]></url>
<username>sofa</username>
<password>YWNz__CK_</password>
<poolProperties>
<minPoolSize>0</minPoolSize>
<maxPoolSize>600</maxPoolSize>
<maxIdleTime>60</maxIdleTime>
<acquisitionTimeout>60</acquisitionTimeout>
<shareTransactionConnections>false</shareTransactionConnections>
<acquireIncrement>2</acquireIncrement>
<deferConnectionRelease>true</deferConnectionRelease>
<testQuery>SELECT 1 FROM DUAL</testQuery>
</poolProperties>
</datasource>
</datasources>
