利用commons-digester3-30.jar解析xml资料

利用commons-digester3-30.jar解析xml文件
此方式解析需要commons-beanutils-1.8.3.jar的支持

Person.java类：

import java.io.Serializable;public class Person implements Serializable {public String id;public String name;public int age;public Person() {}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

data.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?><people><person id="1" name="Shibo Yu" age="28" />  <person id="2" name="Shihuan" age="45" />  <person id="3" name="Old Ages" age="53" /></people>

TestDigester1.java类：

import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.List;import org.apache.commons.digester3.Digester;import org.apache.log4j.Logger;import org.xml.sax.SAXException;import com.commonsdigester.dto.Person;public class TestDigester1 {static Logger logger = Logger.getLogger(TestDigester.class);/** * @param args */public static void main(String[] args) {Digester digester = new Digester();      //此方法作用是是否对XML文档进行DTD验证      digester.setValidating(false);    //addObjectCreate的作用是：当遇见people元素的时候，产生一个java.util.ArrayList对象      digester.addObjectCreate("people", "java.util.ArrayList");      //addSetProperties作用是：对people元素所含的属性赋值(即下面people/person中的对象值)      digester.addSetProperties("people");      //当遇见people/person元素的时候，产生一个com.commonsdigester.dto.Person对象      digester.addObjectCreate("people/person", "com.commonsdigester.dto.Person");      //对people/person元素所含的属性赋值给Person对象digester.addSetProperties("people/person");//当再一次遇见 people下的person元素的时候，调用ArrayList类的add()方法,add：com.commonsdigester.dto.Person对象              digester.addSetNext("people/person", "add", "com.commonsdigester.dto.Person");try {InputStream inputdata = new FileInputStream("D:\\Workspaces\\TestJavaStudy\\src\\com\\commonsdigester\\dto\\data.xml");List personList = (List) digester.parse(inputdata);for (int i = 0; i < personList.size(); i++) {Person person = (Person) personList.get(i);System.out.println(person.getId() + " -- " + person.getName() + " -- " + person.getAge());}} catch (IOException e) {logger.error("load People.xml error.", e);} catch (SAXException e) {logger.error("load People.xml error.", e);} }}

第二种xml格式的解析：
Person.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?><people><person id="1">    <name>Shibo Yu</name>    <age>28</age>  </person>  <person id="2">    <name>Shihuan</name>    <age>45</age>  </person>  <person id="3">    <name>Old Ages</name>    <age>53</age>  </person></people>

TestDigester2.java类：

import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.List;import org.apache.commons.digester3.Digester;import org.apache.log4j.Logger;import org.xml.sax.SAXException;import com.commonsdigester.dto.Person;public class TestDigester2 {static Logger logger = Logger.getLogger(TestDigester.class);/** * @param args */public static void main(String[] args) {Digester digester = new Digester();      //此方法作用是是否对XML文档进行DTD验证      digester.setValidating(false);    //addObjectCreate的作用是：当遇见people元素的时候，产生一个java.util.ArrayList对象      digester.addObjectCreate("people", "java.util.ArrayList");      //addSetProperties作用是：对people元素所含的属性赋值(即下面people/person中的对象值)      digester.addSetProperties("people");      //当遇见people/person元素的时候，产生一个com.commonsdigester.dto.Person对象      digester.addObjectCreate("people/person", "com.commonsdigester.dto.Person");      //对people/person元素所含的属性赋值给Person对象digester.addBeanPropertySetter("people/person/name");digester.addBeanPropertySetter("people/person/age");digester.addSetProperties("people/person");//当再一次遇见 people下的person元素的时候，调用ArrayList类的add()方法,add：com.commonsdigester.dto.Person对象              digester.addSetNext("people/person", "add", "com.commonsdigester.dto.Person");try {// 解析XML文档InputStream input = new FileInputStream("D:\\Workspaces\\TestJavaStudy\\src\\com\\commonsdigester\\dto\\Person.xml");List people = (List) digester.parse(input);for (int i = 0; i < people.size(); i++) {Person person = (Person) people.get(i);System.out.println(person.getId() + " -- " + person.getName() + " -- " + person.getAge());}} catch (IOException e) {logger.error("load People.xml error.", e);} catch (SAXException e) {logger.error("load People.xml error.", e);} }}

【注】第二种解析中关注digester.addBeanPropertySetter("people/person/name");
digester.addBeanPropertySetter("people/person/age");这两句。
addBeanPropertySetter方法还有其它参数形式，详情可参考官方API文档。

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