学步园

今天我学习了SAX的一些基础知识.
在网上看到了sun技术社区的一篇文章《使用JAXP处理XML文件》
这篇文章网址是
http://gceclub.sun.com.cn/yuanchuang/week-9/jaxp.html
我觉得他的算法太麻烦，自己想了一个简单点的,例子里的xml文件是向作者借来的,thx.

一、xml文件以及源代码
Test.xml
<?xml version="1.0" ?>
<customers>
  <customer>
    <id>#001</id>
    <name>Micke</name>
    <address>Najing</address>
  </customer>
  <customer>
    <id>#002</id>
    <name>Car</name>
    <address>Suzhou</address>
  </customer>
  <customer>
    <id>#003</id>
    <name>Jimmy</name>
    <address>ChengDu</address>
  </customer>
  <customer>
    <id>#004</id>
    <name>Henry</name>
    <address>Xi'an</address>
  </customer>
</customers>

Customers.java
/*
 * Created on 2005-12-9
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
import java.util.*;
/**
 * @author Rey
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class Customers {
    private ArrayList customers;
    public Customers() {
        customers = new ArrayList();
    }
    public void addCustomers(Customer c) {
        customers.add(c);
    }
    public String toString() {
        String newline = System.getProperty("line.separator");
        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < customers.size(); i++) {
          buf.append(customers.get(i)).append(newline);
        }
        return buf.toString(); 
    }
}
class Customer {
      private String id;
      private String name;
      private String address;
     
      Customer(String id, String name, String address) {
          this.id = id;
          this.name = name;
          this.address = address;
      }

      public String getAddress() {
        return address;
      }

      public String getId() {
        return id;
      }

      public String getName() {
        return name;
      }

      public void setAddress(String string) {
        address = string;
      }

      public void setId(String string) {
        id = string;
      }

      public void setName(String string) {
        name = string;
      }
       
      public String toString(){
        return "Customer: ID='" + id + "' Name='" + name +
          "' Address='" + address + "'";
      }
}

Test.java
import java.io.*;

import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;

import java.util.*;
/**
 * @author Rey
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class Test extends DefaultHandler {
    private static ArrayList al;
    private StringBuffer textBuffer;
    public Test() {
        al = new ArrayList();
    }
    public static void main(String[] argv) {
        DefaultHandler handler = new Test();

        SAXParserFactory factory = SAXParserFactory.newInstance();

        try {
            SAXParser saxParser = factory.newSAXParser();
            saxParser.parse(new File("Test.xml"), handler);
        } catch (Throwable t) {
            t.printStackTrace();
        }
       ((Test)handler).showList();
        System.exit(0);
    }
    public void endElement(String namespaceURI, String sName, // simple name
            String qName // qualified name
        ) throws SAXException {
        if (qName.equals("id")||qName.equals("name")||qName.equals("address"))
            al.add(echoText());
    }

    public void characters(char[] buf, int offset, int len)
        throws SAXException {
        String s = new String(buf, offset, len);

        if (textBuffer == null) {
            textBuffer = new StringBuffer(s);
        } else {
            textBuffer.append(s);
        }
    }
    private String echoText(){
        String s = ""  +textBuffer;
        textBuffer = null;
        return s.trim();
    }
    public void showList() {
        Customers c = new Customers();
        String[] temp = (String[])al.toArray(new String[1]);
        for (int i = 0, j = 0; i < al.size()/3; i++) {
            c.addCustomers(new Customer(temp[j++], temp[j++], temp[j++]));
        }
        System.out.println(c);
    }
}

二、程序输出:
Customer: ID='#001' Name='Micke' Address='Najing'
Customer: ID='#002' Name='Car' Address='Suzhou'
Customer: ID='#003' Name='Jimmy' Address='ChengDu'
Customer: ID='#004' Name='Henry' Address='Xi'an'

三、笔记
在阅读sun公司的文档时，有几个名词好半天都不知道什么意思，查了半天才知道.
关于XML的名称空间,限定名称、前缀和本地部分
名称空间中的元素和属性的名称中以冒号隔开
rdf:description
xlink:type
xsl:template
冒号前的部分叫前缀(prefix)
冒号后的部分叫本地部分(local part)
包括冒号在内的整个部分叫限定名称(qualified name)qName