SAX解析xml
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2022-05-28 09:38:19
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SAXParseHandler.java
package com.hl.chapter1;
import java.util.ArrayList;
import java.util.List;
import javax.swing.text.AbstractDocument.Content;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SAXParseHandler extends DefaultHandler{
//返回结果集
List<User> users = null;
//保存当前节点的内容
String content = null;
//保存当前的用户节点信息
private User user = null;
@Override
public void startDocument() throws SAXException {
super.startDocument();
//初始化结果集
users = new ArrayList<>();
System.out.println("开始解析--------");
}
@Override
public void endDocument() throws SAXException {
System.out.println("解析结束--------");
super.endDocument();
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
super.startElement(uri, localName, qName, attributes);
//将一个子节点的属性保存
if("user".equals(qName)){
user = new User();
String id = attributes.getValue("id");
user.setId(id);
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
//将一个节点的值保存
if("name".equals(qName)){
user.setName(content);
}else if ("age".equals(qName)) {
user.setAge(content);
}else if ("num".equals(qName)) {
user.setNum(content);
}else if ("user".equals(qName)) {
//将一个完整节点信息添加到结果集中
users.add(user);
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
//内容
content = new String(ch,start,length);
}
public List<User> getUser(){
//获取结果集
return users;
}
}
user.xml
<?xml version="1.0" encoding="UTF-8"?>
<users>
<user id="1">
<name>张三</name>
<age>23</age>
<num>5115</num>
</user>
<user id="2">
<name>李四</name>
<age>18</age>
<num>5116</num>
</user>
<user id="3">
<name>娜娜</name>
<age>34</age>
<num>523</num>
</user>
</users>
User.java
package com.hl.chapter1;
public class User {
private String id;
private String name;
private String age;
private String num;
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 String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", age=" + age + ", num=" + num + "]";
}
}
测试
SAXParseXML.java
package com.hl.chapter1;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.SAXException;
public class SAXParseXML {
public static void main(String[] args) throws Exception {
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
SAXParseHandler saxParseHandler = new SAXParseHandler();
saxParser.parse("src/com/hl/chapter1/user.xml", saxParseHandler);
List<User> users = saxParseHandler.getUser();
for(User user:users){
System.out.println(user);
}
}
}
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