答:下面是要解析的XML文件:
<?xml version="1.0" encoding="UTF-8"?>
<persons>
<person id="1">
<name>张三</name>
<age>22</age>
</person>
<person id="2">
<name>李四</name>
<age>23</age>
</person>
</persons>
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定义一个名为Person的javaBean用于存放上面解析出来的xml内容
publicclass Person {
private Integer id;
private String name;
private Short age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
publicvoid setName(String name) {
this.name = name;
}
public Short getAge() {
return age;
}
publicvoid setAge(Short age) {
this.age = age;
}
}
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(1)使用SAX读取XML文件;它采用的是事件驱动,并不需要解析完整个文档,速度快并且占用内存少。需要为SAX提供实现ContentHandler接口的类。
PersonDefaultHandler.java
import java.util.ArrayList;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.sinber.domain.Person;
publicclass PersonDefaultHandler extends DefaultHandler {
private List<Person> persons;
private Person person ; //记录当前person
private String perTag; //记录前一个标签的名称
/**
* 重写父类的开始文档方法。用于初始化
*/
@Override
publicvoid startDocument() throws SAXException {
persons =new ArrayList<Person>();
}
@Override
publicvoid startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if("person".equals(localName)){
Integer id =new Integer(attributes.getValue(0)); //取id
person =new Person();
person.setId(id);
}
perTag = localName;
}
/**参数:
* ch 整个XML字符串
* start 节点值在整个XML字符串中的索引位置
* length 节点值的长度
*/