java读取xml例子 SAXReader
用到的是DOM4J里面的SAXReader类，需要下载dom4j的jar包。
本文为了方便起见，特地在末尾上传了它的jar包。
此util类的功能是读取xml中的关于数据库配置的URL、用户名、密码。
util类如下：
package com.vastis.util;
import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class ReadSpringXmlUtil {
public void iterateWholeXML(String filename, HashMap<String, String> hm) throws Exception{
SAXReader saxReader = new SAXReader();
try {
Document document = saxReader.read(new File(filename));
Element root = document.getRootElement();
//遍历根结点,即第一层
for (Iterator iter = root.elementIterator(); iter.hasNext();) {
Element element = (Element) iter.next();
// 获取id为dataSource的节点的bean
if(element!=null){
Attribute ageAttr = element.attribute("id");
if (ageAttr != null && !ageAttr.equals("")) {
String id = ageAttr.getValue();
if (id != null && id.equals("dataSource")) {
// 遍历第二层（即driverClassName，url，username，password），并进行处理
for (Iterator iterInner = element.elementIterator(); iterInner.hasNext();) {
Element elementInner = (Element) iterInner.next();
if(elementInner!=null && !elementInner.equals("")){
//获取name属性
Attribute dsAttr = elementInner.attribute("name");
if(dsAttr!=null && !dsAttr.equals(""))
//下面开启遍历第3层，即4个property
for (Iterator iterThird = elementInner.elementIterator(); iterThird
.hasNext();) {
Element elementThird = (Element) iterThird.next();
if(elementThird!=null && !elementThird.equals("")){
if(elementThird.getName().equals("value")){
hm.put(dsAttr.getValue(), elementThird.getText());
// System.out.println("name="+elementThird.getName());
// System.out.println("value="+elementThird.getText());
}
}
}
}
}
}
}
}
}
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new Exception(e);
}
}
}
调用util类的函数如下:将此函数放在main函数中即可跑起来。
/**
* 读取数据库配置，从spring.conf.xml中读取
* @throws Exception
*/
private void configDBInfo() throws Exception{
HashMap<String, String> hashMap= new HashMap<String, String>();
ReadSpringXmlUtil rsxu=new ReadSpringXmlUtil();
rsxu.iterateWholeXML(FILE_PATH,hashMap);
try{
if(hashMap!=null && hashMap.size()>0){
for(java.util.Iterator iter=hashMap.keySet().iterator();iter.hasNext();){
Object key=iter.next();
String value=hashMap.get(key);
if(((String)key).equals(Constants.URL)){
ReadOnlyConfiger.setUrl(value);
}else if(((String)key).equals(Constants.USERNAME)){
ReadOnlyConfiger.setUserName(value);
}else if(((String)key).equals(Constants.PASSWORD)){
ReadOnlyConfiger.setPassword(value);
}
}
}else{
System.err.println("数据库配置信息未找到，请查看spring.conf.xml文件中的数据配置信息是否存在!");
}
}catch(Exception ex){
System.out.println(ex.toString());
throw new Exception(ex);
}
}
xml源文件如下：
<?xml version="1.0" encoding="GB2312"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<!--JDBC数据源配置-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName">
<value>oracle.jdbc.driver.OracleDriver</value>
</property>
<property name="url">
<value>jdbc:oracle:thin:@11.5.56.199:1521/caqa</value>
</property>
<property name="username">
<value>system</value>
</property>
<property name="password">
<value>admin</value>
</property>
</bean>
<!-- hibernate 配置文件 -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource">
<ref bean="dataSource"/>
</property>
<property name="configLocation">
<value>/WEB-INF/classes/conf/hibernate.cfg.xml</value>
</property>
</bean>
<!-- hibernate 事务工厂 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<!-- hibernate 事务代理 -->
<bean id="txProxyTemplate" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager">
<ref bean="transactionManager"/>
</property>
<property name="transactionAttributes">
<props>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="Create*">PROPAGATION_REQUIRED</prop>
<prop key="create*">PROPAGATION_REQUIRED</prop>
<prop key="add*">PROPAGATION_REQUIRED</prop>
<prop key="update*">PROPAGATION_REQUIRED</prop>
<prop key="copy*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!--JDBC事务工厂-->
<bean id="JDBCtransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource">
<ref local="dataSource"/>
</property>
</bean>
<!--JDBC 事务代理-->
<bean id="JDBCDAOProxy" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager">
<ref bean="JDBCtransactionManager"/>
</property>
<property name="transactionAttributes">
<props>
<prop key="insert*">PROPAGATION_REQUIRED</prop>
<prop key="update*">PROPAGATION_REQUIRED</prop>
<prop key="delete*">PROPAGATION_REQUIRED</prop>
<prop key="*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- base -->
<!-- base:project -->
<bean id="projectDAO" class="com.vastis.base.project.dao.impl.ProjectDAOHibernateImpl">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<bean id="projectFacade" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.base.project.service.impl.ProjectFacadeImpl">
<property name="projectDAO">
<ref bean="projectDAO"/>
</property>
</bean>
</property>
</bean>
<bean id="projectHelper" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.base.project.service.impl.ProjectHelperImpl">
<property name="projectDAO">
<ref bean="projectDAO"/>
</property>
</bean>
</property>
</bean>
<!-- end base:project -->
<!--base:param-->
<bean id="paramDAO" class="com.vastis.base.param.dao.impl.ParamDAOHibernateImpl">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<bean id="paramHelper" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.base.param.service.impl.ParamHelperImpl">
<property name="paramDAO">
<ref bean="paramDAO"/>
</property>
</bean>
</property>
</bean>
<bean id="paramFacade" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.base.param.service.impl.ParamFacadeImpl">
<property name="paramDAO">
<ref bean="paramDAO"/>
</property>
</bean>
</property>
</bean>
<!-- end base:param -->
<!--ccms:qamonitor-->
<bean id="qaMonitorDAOHibernate" class="com.vastis.ccms.qamonitor.dao.impl.QAMonitorDAOHibernateImpl">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<bean id="QamonitorFacade" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.ccms.qamonitor.service.impl.QAMonitorFacadeImpl">
<property name="qaMonitorDAOHibernate">
<ref bean="qaMonitorDAOHibernate"/>
</property>
</bean>
</property>
</bean>
<bean id="QamonitorHelper" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.ccms.qamonitor.service.impl.QAMonitorHelperImpl">
<property name="qamonitorDAOHibernate">
<ref bean="qaMonitorDAOHibernate"/>
</property>
</bean>
</property>
</bean>
<!-- end ccms:qamonitor-->
<!-- start ccms:staff -->
<bean id="staffDAO" class="com.vastis.ccms.staff.dao.impl.StaffDAOHibernateImpl">
<property name="sessionFactory">
<ref local="sessionFactory"/>
</property>
</bean>
<bean id="staffJDBCDAO" class="com.vastis.ccms.staff.dao.impl.StaffDAOJDBCImpl">
<property name="dataSource">
<ref local="dataSource"/>
</property>
</bean>
<bean id="staffFacade" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.ccms.staff.service.impl.StaffFacadeImpl">
<property name="staffDAOHibernate">
<ref bean="staffDAO"/>
</property>
<property name="staffDAOJDBC">
<ref bean="staffJDBCDAO"/>
</property>
</bean>
</property>
</bean>
<bean id="staffHelper" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.ccms.staff.service.impl.StaffHelperImpl">
<property name="staffDAOHibernate">
<ref bean="staffDAO"/>
</property>
<property name="staffDAOJDBC">
<ref bean="staffJDBCDAO"/>
</property>
</bean>
</property>
</bean>
<!-- end ccms:staff -->
<bean id="MenuManagerFacade" class="com.vastis.menu.service.FacadeImpl"/>
<bean id="MenuManagerHelper" class="com.vastis.menu.service.MenuManagerHelperImpl"/>
<bean id="securityFacade" parent="txProxyTemplate">
<property name="target">
<bean class="com.vastis.security.service.impl.SecurityFacadeImpl">
</bean>
</property>
</bean>
</beans>
refurl:http://hi.baidu.com/yuletianxia750/blog/item/920dae456c21fb8fb2b7dc90.html