Java之xml文件解析二（SAX方式解析xml文件）

books类用来实现储存xml文件中数据结构

public class Books {
private String id;
private String name;
private String author;
private String year;
private String price;
private String language;

public Books() {
super();
}
public Books(String id, String name, String author, String year, String price, String language) {
super();
this.id = id;
this.name = name;
this.author = author;
this.year = year;
this.price = price;
this.language = language;
}
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 getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language;
}

}


通过SAXParserHandler来实现xml文件的解析

package handler;

import java.util.ArrayList;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import domTest.Books;

public class SAXParserHandler extends DefaultHandler {
public int bookindex = 0;
public String value = null;
public Books book = null;
private ArrayList<Books> bookList = new ArrayList<Books>();
public ArrayList<Books> getBookList() {
return bookList;
}
/**
* 用来遍历xml文件的开始标签
*/
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
// 调用DefaultHandler类的startElement方法
super.startElement(uri, localName, qName, attributes);
// 开始解析book元素的属性
if (qName.equals("book")) {
bookindex++;
// 创建一个book元素对象
book = new Books();
System.out.println("-----------------开始遍历第" + bookindex + "本书的内容-------------------");
// 已知book元素的属性名称，根据属性名称获取属性值
// String value = attributes.getValue("id");
// System.out.println("book的属性值是："+value);

// 不知道book元素下属性的名称以及个数，如何获取属性名以及属性值
int num = attributes.getLength();
for (int i = 0; i < num; i++) {
System.out.print("book元素的第" + (i + 1) + "个属性名是：" + attributes.getQName(i));
System.out.println("-----属性值是：" + attributes.getValue(i));
if (attributes.getQName(i).equals("id")) {
book.setId(attributes.getValue(i));
}
}
} else if ((!qName.equals("bookstore")) && (!qName.equals("book")))
System.out.print("节点名是：" + qName + "---节点值是：");
}

/**
* 用来标识解析开始
*/
@Override
public void startDocument() throws SAXException {
super.startDocument();
System.out.println("SAX解析开始");
}

/**
* 用来遍历xml文件的结束标签
*/
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
// 调用DefaultHandler类的endElement方法
super.endElement(uri, localName, qName);
// 判断是否针对一本书已经遍历结束
if (qName.equals("book")) {
bookList.add(book);
book = null;
System.out.println("-----------------结束遍历第" + bookindex + "本书的内容-------------------");
} else if (qName.equals("name")) {
book.setName(value);
} else if (qName.equals("author")) {
book.setAuthor(value);
} else if (qName.equals("year")) {
book.setYear(value);
} else if (qName.equals("price")) {
book.setPrice(value);
} else if (qName.equals("language")) {
book.setLanguage(value);
}
}

/**
* 用来标识解析结束
*/
@Override
public void endDocument() throws SAXException {
super.endDocument();
System.out.println("SAX解析结束");
}

@Override
public void characters(char[] ch, int start, int length) throws SAXException {// ch是xml文档的内容
super.characters(ch, start, length);
value = new String(ch, start, length);
if (!(value.trim().equals("")))
System.out.println(value);
}

}

运行结果：