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Java解析XML（一）、SAX
package xml;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import model.Book;
/**
* 使用SAX解析XML文件
*/
public class SaxHelper {
private static SAXParserFactory spf;
/**
* 使用SAX方式解析XML文件
* @param is XML文件輸入流
* @return
*/
public static List<Book> saxReader(InputStream is) {
try {
if (spf == null)
spf = SAXParserFactory.newInstance();
SAXParser saxParser = spf.newSAXParser();
XmlContentHandler xmlContentHandler = new XmlContentHandler();
saxParser.parse(is, xmlContentHandler);
return xmlContentHandler.getBooks();
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
package xml;
import java.util.ArrayList;
import java.util.List;
import model.Book;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import util.DateUtils;
/**
* SAX解析XML文件的事件處理器
*/
public class XmlContentHandler extends DefaultHandler {
private Book book; //保存每一個節點的對象
private List<Book> books; //保存已解析好的節點對象
private String preTag; //保存當前正在解析的節點標簽名
@Override
public void startDocument() throws SAXException {
System.out.println("開始解析文檔...");
books = new ArrayList<Book>();
}
@Override
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
if (name.equals("book") && book == null) {
book = new Book();
book.setIsbn(attributes.getValue("", "isbn"));
}
preTag = name; //記錄當前開始節點名
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if (book != null && preTag != null && !"book".equals(preTag) && !"books".equals(preTag)) {
String data = new String(ch,start,length);
if (!"".equals(data.trim())) {
if ("name".equals(preTag)) {
book.setName(data);
} else if ("author".equals(preTag)) {
book.setAuthor(data);
} else if ("publishing".equals(preTag)) {
book.setPublishing(data);
} else if ("pubdate".equals(preTag)) {
book.setPubdate(DateUtils.string2Date("yyyy-mm-dd", data));
} else if ("price".equals(preTag)) {
book.setPrice(Double.parseDouble(data));
}
}
}
}
@Override
public void endElement(String uri, String localName, String name)
throws SAXException {
if ("book".equals(name) && book != null) {
books.add(book);
book = null; //一個節點的結束,代表一本書的信息解析完成,所以要將book設為null
}
preTag = null; //同時將當前書的節點設為null
}
@Override
public void endDocument() throws SAXException {
System.out.println("XML文件解析結束...");
System.out.println("結果:" + books);
}
/**
* 獲得解析後的數據
* @return
*/
public List<Book> getBooks() {
return books;
}
}
package model;
import java.util.Date;
/**
* 圖書
*/
public class Book {
/**
* 圖書編號
*/
private String isbn;
/**
* 書名
*/
private String name;
/**
* 作者
*/
private String author;
/**
* 出版社
*/
private String publishing;
/**
* 發布時間
*/
private Date pubdate;
/**
* 價格
*/
private double price;
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
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 getPublishing() {
return publishing;
}
public void setPublishing(String publishing) {
this.publishing = publishing;
}
public Date getPubdate() {
return pubdate;
}
public void setPubdate(Date pubdate) {
this.pubdate = pubdate;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String toString() {
return "name: " + name + " isbn: " + isbn + " author: " + author
+ " publishing: " + publishing + " pubdate: " + pubdate
+ " price: " + price;
}
}
<?xml version="1.0" encoding="UTF-8"?> <books> <!-- ISBN:國際標準書號由13位數字組成。前三位數字代表圖書，中間的9個數字分為三組，分別表示組號、出版社號和書序號，最後一個數字是校驗碼。 --> <book isbn="9787121025389"> <name>JAVA麵向對象編程</name> <author>孫衛琴</author> <publishing>電子工業出版社</publishing> <pubdate>2006-07-01</pubdate> <price>50.60</price> </book> <book isbn="9787111349662"> <name>深入理解Java虛擬機：JVM高級特性與最佳實踐</name> <author>周誌明</author> <publishing>機械工業出版社</publishing> <pubdate>2011-07-01</pubdate> <price>46.20</price> </book> <book isbn="9787508338408"> <name>Java網絡編程（第3版）</name> <author>（英）哈諾德 著 朱濤江，林劍 譯</author> <publishing>中國電力出版社</publishing> <pubdate>2005-11-01</pubdate> <price>63.80</price> </book> <book isbn="9787508379661"> <name>Java經典實例（第2版）</name> <author>（美）達爾文（Darwin，F.I） 著 關麗榮，張曉坤 譯</author> <publishing>中國電力出版社</publishing> <pubdate>2009-02-01</pubdate> <price>72.10</price> </book> <book isbn="9787111213826"> <name>Java編程思想（第4版）</name> <author>（美）埃克爾 著 陳昊鵬 譯</author> <publishing>機械工業出版社</publishing> <pubdate>2007-06-01</pubdate> <price>74.50</price> </book> <book isbn="9787508344980"> <name>Head First Java（中文版）（第2版）</name> <author>（美）塞若（Sierra，K.），（美）貝茨（Bates，B.） 著 O’Reilly Taiwan公司 譯 張然，等 編</author> <publishing>中國電力出版社</publishing> <pubdate>2007-02-01</pubdate> <price>55.20</price> </book> <book isbn="9787111231837"> <name>數據結構與算法分析：Java語言描述（第2版）</name> <author>（美）韋斯（Weiss，M.A.） 著 馮舜璽 譯</author> <publishing>機械工業出版社</publishing> <pubdate>2009-01-01</pubdate> <price>41.20</price> </book> </books>
最後更新：2017-04-02 22:16:20