DOM4j SAXReader 读取XML文件
SAXReader主要用于解析XML文件,是当前比较流行的xml解决方案.
使用SAXReader需要下载dom4j的jar包（dom4j-1.6.1.jar）
Document document=new SAXReader.reader(“xml文路径/文件名xxx.xml”);//得到Document对象
Element root = document.getRootElement()//获得根节点
List<Element> nodes = root.elements("student");
String id = node.elementText("id")
Iterator iterator=root.elementIterator(); //从根节点遍历子节点Iterator iterator=Element.elementIterator(); //再从子节点在遍历其子节点对节点访问其属性用：Attribute leaderAttr =Element. attribute(“xxx”);对节点访问其某个属性leaderAttr的名称：leaderAttr.getName()；对节点访问其某个属性leaderAttr的值：leaderAttr.getValue()对节点访问其名称：Element.getName();对节点访问其文本：Element.
getText();
String xmlAddress = "./aaa.xml";
SAXReader reader = new SAXReader();
File xmlFile = new File(xmlAddress);
Document document = reader.read(xmlFile);
InputStream in = this.getClass().getResourceAsStream("photo.xml")
方法getResourceAsStream()是一个标准方法，用来打开一个外部输入文件。文件的位置取决于类加载器，而标准的类加载器从classpath开始搜索
如：c:/temp/mytest/Test.class
package mytest;
public class Test{...}
Test.class.getResourceAsStream(str);
str="/db.properties" 则 db.properties 放在 c:/temp下
str="db.properties" 则 db.properties 放在c:/temp/mytest下
JAVA里面对于类进行调用配置资源的文件数据，以this.getClass().getResourceAsStream()来读取比较合适。Document document = reader.read(in);
这里用FILE方式读取，其实用URL是一样的------------------------------------------用dom4j就要用XPath,索引节点非常方便这里的XPathExpression就是类似"/root/element/element"的字符串具体表达式的应用去看下XPath教程就行，入手很容易//返回符合表达式的节点LISTList list = document.selectNodes(XPathExpression);//返回符合表达式的一个节点Node node = document.selectSingleNode(XPathExpression);
SAXReader reader = new SAXReader();
reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
/* 在读取文件时，去掉dtd的验证，可以缩短运行时间 */
reader.setEncoding("UTF-8");
Document document = reader.read(new File(文件路径));
例子：
package com.dc.framework.taglib;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
import org.apache.commons.lang.StringUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
//自定义标签处理类
public class ReadUploadFile {
// 配置文件的路径
static String uploadCfgFile = "WEB-INF/conf/uploadfile.xml";
//文档对象实体
Document uploadDocument = null;
//结果存储体
Map uploadMap = new HashMap();
/**
* @param request
* @return
* 获取配置文件绝对路径
*/
private String getuploadCfgFile(ServletRequest request) {
return ((HttpServletRequest) request).getSession().getServletContext().getRealPath(uploadCfgFile);
}
/**
* @param request
* @return
* 初始化配置文件
*/
private Document inituploadCfgDocument(ServletRequest request) {
SAXReader saxReader = new SAXReader();
try {
//得到指定文件以流的形式对文件进行序列化
FileInputStream fis = new FileInputStream(getuploadCfgFile(request));
uploadDocument = saxReader.read(fis);
}
catch (DocumentException e) {
e.printStackTrace();
}
catch(FileNotFoundException fnfe){
fnfe.printStackTrace();
}
return uploadDocument;
}
/**
* 获取配置文件
*
* @param request
* @return
*/
private Document getuploadCfgDocument(ServletRequest request) {
if (this.uploadDocument == null) {
this.uploadDocument = inituploadCfgDocument(request);
}
return this.uploadDocument;
}
/**
* @param request
* @return
* 获取某个指定preparents的配置属性
*/
public Map getuploadMap(ServletRequest request) {
//xml中的访问路径,说明欲处理XML文件的根元素是fileaction-configuration
String xPath = "//fileaction-configuration/preparents";
//获取按照指定搜索路径得到的元素列表,这里指获取所有的fileaction-configuration下的preparents元素
List result = getuploadCfgDocument(request).selectNodes(xPath);
//属性和指定子元素的存储体
Map uploadMap = new HashMap();
//遍历所得元素
Iterator iter = result.iterator();
while (iter.hasNext()) {
//获得具体的preparents元素
Element preparents = (Element) iter.next();
// 取得preparents元素的id属性的值
String id2 = preparents.attributeValue("id");
// 取得preparents元素下子元素tabname的值,并与id2配对存储
uploadMap.put(id2,
StringUtils.trim(preparents.elementText("tabname")));
}
return uploadMap;
}
}
简单代码为如下：
Document document=new SAXReader.reader(“xml文路径/文件名xxx.xml”);
Element root = document.getRootElement();
HashMap hm = new HashMap<String,String>();
for ( Iterator iter = root.elementIterator(); iter.hasNext(); )
{ Element element = (Element) iter.next();
Attribute ageAttr=element.attribute("age");
String age = ageAttr.getValue();
。。。。。
for ( Iterator iterInner = element.elementIterator(); iterInner.hasNext(); ) {
Element elementInner = (Element) iterInner.next();
//遍历college节点开始
if(elementInner.getName().equals("college")){
/添加college的文本
hm.put(elementInner.getName()+ num, elementInner.getText());
//添加college的leader属性
Attribute leaderAttr=elementInner.attribute("leader");
。。。。。如果leaderAttr不是空字符或者其值不为null。。。。。
hm.put(elementInner.getName() + "-"+leaderAttr.getName()+ num,
leaderAttr.getValue());
}
else{ //遍历非college节点的其它节点
hm.put(elementInner.getName()+ num, elementInner.getText());
}
<?xml version="1.0" encoding="UTF-8"?>
<students>
<student age="25"><!--如果没有age属性，默认的为20-->
<name>崔卫兵</name>
<college>PC学院</college>
<telephone>62354666</telephone>
<notes>男,1982年生,硕士，现就读于北京邮电大学</notes>
</student>
<student>
<name>cwb</name>
<college leader="学院领导">PC学院</college><!--如果没有leader属性，默认的为leader-->
<telephone>62358888</telephone>
<notes>男,1987年生,硕士，现就读于中国农业大学</notes>
</student>
<student age="45">
<name>xxxxx</name>
<college leader="">xxx学院</college>
<telephone>66666666</telephone>
<notes>注视中，注释中</notes>
</student>
<student age="">
<name>lxx</name>
<college>yyyy学院</college>
<telephone>88888888</telephone>
<notes>注视中111，注释中222</notes>
</student>
</students>
Dom4jReadExmple.java
package test2;
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 Dom4jReadExmple {
public void iterateWholeXML(String filename,HashMap<String,String> hm){
SAXReader saxReader = new SAXReader();
try {
Document document = saxReader.read(new File(filename));
Element root = document.getRootElement();
// 用于记录学生编号的变量
int num=-1;
//遍历根结点（students）的所有孩子节点（肯定是student节点）
for ( Iterator iter = root.elementIterator(); iter.hasNext(); ) {
Element element = (Element) iter.next();
num++;
// 获取person节点的age属性的值
Attribute ageAttr=element.attribute("age");
if(ageAttr!=null){
String age = ageAttr.getValue();
if (age != null&&!age.equals("")) {
hm.put(element.getName() + "-"+ageAttr.getName()+ num, age);
} else {
hm.put(element.getName() + "-" +ageAttr.getName()+ num, "20");
}
}else{
hm.put(element.getName() + "-age"+ num, "20");
}
//遍历student结点的所有孩子节点（即name，college，telphone，notes），并进行处理
for ( Iterator iterInner = element.elementIterator(); iterInner.hasNext(); ) {
Element elementInner = (Element) iterInner.next();
if(elementInner.getName().equals("college")){
hm.put(elementInner.getName()+ num, elementInner.getText());
//获取college节点的leader属性的值
Attribute leaderAttr=elementInner.attribute("leader");
if(leaderAttr!=null){
String leader = leaderAttr.getValue();
if (leader != null&&!leader.equals("")) {
hm.put(elementInner.getName() + "-"+leaderAttr.getName()+ num, leader);
} else {
hm.put(elementInner.getName() + "-" +leaderAttr.getName()+ num, "leader");
}
}else {
hm.put(elementInner.getName() + "-leader"+ num, "leader");
}
}else{
hm.put(elementInner.getName()+ num, elementInner.getText());
}
}
}
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
TestDom4jReadExmple.java
package dom4jExample.read;
import java.util.HashMap;
public class TestDom4jReadExmple {
public static void main(String[] args) {
try{
//获取解析完后的解析信息
HashMap<String,String> hashMap;
Dom4jReadExmple drb=new Dom4jReadExmple();
//遍历整个XML文件
hashMap = new HashMap<String,String>();
drb.iterateWholeXML("studentInfo.xml", hashMap);
System.out.println("姓名\t年龄\t学院\t学院领导\t电话\t\t备注");
for(int i=0;i<hashMap.size();i+=6){
int j=i/6;
System.out.print(hashMap.get("name"+j)+"\t");
System.out.print(hashMap.get("student-age"+j)+"\t");
System.out.print(hashMap.get("college"+j)+"\t");
System.out.print(hashMap.get("college-leader"+j)+"\t");
System.out.print(hashMap.get("telephone"+j)+"\t");
System.out.println(hashMap.get("notes"+j)+"\t");
}
}catch(Exception ex){
ex.printStackTrace();
}
}
}
二、
一个读写操作的例子：
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class testXml {
public static void main(String[] args) {
try {
testXml test = new testXml();
test.testWrite();
test.testRead();
} catch (Exception e) {
e.printStackTrace();
}
}
public void testRead() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new FileInputStream("src/output.xml"));
Element root = document.getRootElement();
for (Iterator iter = root.elementIterator(); iter.hasNext();) {
Element element = (Element) iter.next();
System.out.println(element.getText());
System.out.println(element.attributeValue("name"));
System.out.println(element.attributeValue("blog"));
}
}
public void testWrite() throws Exception{
Document document = DocumentHelper.createDocument();
Element root = document.addElement("root");
for(int i=0;i<10;i++){
Element element1 = root.addElement("user")
.addAttribute("name","Alex"+i)
.addAttribute("id", "id"+i)
.addText("我是信息");
}
XMLWriter writer = new XMLWriter(new FileOutputStream("src/output.xml"));
writer.write(document);
writer.close();
}
}
输出的效果：
<?xml version="1.0" encoding="UTF-8"?>
<root>
<user name="Alex0" id="id0">我是信息</user>
<user name="Alex1" id="id1">我是信息</user>
<user name="Alex2" id="id2">我是信息</user>
<user name="Alex3" id="id3">我是信息</user>
<user name="Alex4" id="id4">我是信息</user>
<user name="Alex5" id="id5">我是信息</user>
<user name="Alex6" id="id6">我是信息</user>
<user name="Alex7" id="id7">我是信息</user>
<user name="Alex8" id="id8">我是信息</user>
<user name="Alex9" id="id9">我是信息</user>
</root>
例子：
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);
}
}
}
/**
* 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>