用SAX解析XML文件

为了帮助兽兽同学写一个XML的解析..专门复习了下怎么写SAX的解析.

首先，介绍下XML目前的两种写法.
第1种

<?xml version="1.0"?>
<user>
	<customer>
		<FirstName>Bob2</FirstName>
		<LastName>Hustead</LastName>
		<CustId>abc.123</CustId>
	</customer>
	<customer>
		<FirstName>Bob3</FirstName>
		<LastName>Hustead</LastName>
		<CustId>abc.123</CustId>
	</customer>
</user>

第2种
rbac.xml

<?xml version="1.0" encoding="UTF-8"?>
<rbac-definition>
	<organizations>
		<organization id="1" name="华迪" no="A0"
			innerno="8790-C9B2-7B08-46FD-A4F8-4157-AD25-5F7B" superiororg="0"
			virflag="0" status="0" />
		<organization id="2" name="业务部" no="A1"
			innerno="0EBE-1B07-BD59-425E-958E-2281-A473-9383" superiororg="1"
			virflag="0" status="0" />
		<organization id="3" name="软件中心" no="A2"
			innerno="D30C-FB7A-E7E-49CE-A3D2-695B-0A4A-CD5B" superiororg="1"
			virflag="0" status="0" />
	</organizations>
	<positions>
		<position id="1" name="用户" no="A1.1" owner="" />
		<position id="2" name="主管" no="A1.2" owner="" />
		<position id="3" name="经理" no="A1.3" owner="" />
		<position id="4" name="总工" no="A2.1" owner="" />
	</positions>

	<org-poses>
		<org-pos orgid="2" posid="1" />
		<org-pos orgid="2" posid="2" />
		<org-pos orgid="2" posid="3" />
		<org-pos orgid="3" posid="4" />
		<org-pos orgid="3" posid="5" />
	</org-poses>
</rbac-definition>

对于第一种的解析，google上铺天盖地的都是...偏偏兽兽同学要的是第2中的解析..当然也是大同小异..ok..他要求还挺多..还必须把每一个数据项都摘出来..以便进行后续开发使用.那好吧..开工！

第2步：针对第2中XML以及其中内容进行准备工作
1.建立org,pos,org_pos的类 便于操作

package parseXML;

public class Organization {

	public int id;
	public String name;
	public String no;
	public String innerno;
	public int superiororg;
	public int virflag;
	public int status;

	public String toString() {
		String str = "";
		str = "the org's id is " + id + ",name is " + name + " ,no is " + no
				+ " ,innerno" + innerno + " ,superiororg is " + superiororg
				+ " ,virflag is " + virflag + " ,status is " + status;
		return str;
	}
}

class Position {

	private int id;
	private String name;
	private String no;
	private String owner;

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getNo() {
		return no;
	}
	public void setNo(String no) {
		this.no = no;
	}
	public String getOwner() {
		return owner;
	}
	public void setOwner(String owner) {
		this.owner = owner;
	}

}

class Org_pos {
	private int org_id;
	private int pos_id;

	public int getOrg_id() {
		return org_id;
	}
	public void setOrg_id(int org_id) {
		this.org_id = org_id;
	}
	public int getPos_id() {
		return pos_id;
	}
	public void setPos_id(int pos_id) {
		this.pos_id = pos_id;
	}

}

2.根据SAX原理，写出来handler,用于解析
ParseOrg.java

package parseXML;

import java.util.ArrayList;
import java.util.List;

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

public class ParseOrg extends DefaultHandler {
	boolean hasAttribute = false;
	Attributes attributes = null;
	
	private List<Organization> orgList=new ArrayList<Organization>();
	private List<Position> posList=new ArrayList<Position>();
	private List<Org_pos> org_posList=new ArrayList<Org_pos>();
	
	
	public void startDocument() throws SAXException {
		System.out.println("~~begining~~");
	}
	public void endDocument() throws SAXException {
		System.out.println("~~end~~");
	}
	
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if (qName.equals("organization")) {
			System.out.println("********************************");
			System.out.println("       Organization :");
			System.out.println("********************************");
			System.out.println(attributes.getQName(0) + " is : "
					+ attributes.getValue(0)+"\n"+attributes.getQName(1) + "is : "
					+ attributes.getValue(1)+"\n"+attributes.getQName(2) + "is : "
					+ attributes.getValue(2)+"\n"+attributes.getQName(3) + "is : "
					+ attributes.getValue(3)+"\n"+attributes.getQName(4) + "is : "
					+ attributes.getValue(4)+"\n"+attributes.getQName(5) + "is : "
					+ attributes.getValue(5)+"\n"+attributes.getQName(6) + "is : "
					+ attributes.getValue(6));
			Organization org=new Organization();
			org.id=Integer.parseInt( attributes.getValue(0));
			org.name=attributes.getValue(1);
			org.no=attributes.getValue(2);
			org.innerno=attributes.getValue(3);
			org.superiororg=Integer.parseInt( attributes.getValue(4));
			org.virflag=Integer.parseInt( attributes.getValue(5));
			org.status=Integer.parseInt( attributes.getValue(6));
//			System.out.println(org.toString());
			orgList.add(org);
			
		}
		if (attributes.getLength() > 0) {
			System.out.println(attributes.getLength()+"  :attributes length");
			this.attributes = attributes;
			this.hasAttribute = true;
		}
		if (qName.equals("position")) {
			System.out.println("********************************");
			System.out.println("         position :");
			System.out.println("********************************");
			System.out.println(attributes.getQName(0) + " is : "
					+ attributes.getValue(0)+"\n"+attributes.getQName(1) + "is : "
					+ attributes.getValue(1)+"\n"+attributes.getQName(2) + "is : "
					+ attributes.getValue(2)+"\n"+attributes.getQName(3) + "is : "
					+ attributes.getValue(3));
			Position pos=new Position();
			pos.setId(Integer.parseInt( attributes.getValue(0)));
			pos.setName(attributes.getValue(1));
			pos.setNo(( attributes.getValue(2)));
			pos.setOwner(attributes.getValue(3));
			posList.add(pos);
		}
		if (qName.equals("org-pos")) {
			System.out.println("********************************");
			System.out.println("         org-pose :");
			System.out.println("********************************");
			System.out.println(attributes.getQName(0) + " is : "
					+ attributes.getValue(0)+"\n"+attributes.getQName(1) + "is : "
					+ attributes.getValue(1));
			Org_pos org_pos=new Org_pos();
			org_pos.setOrg_id(Integer.parseInt(attributes.getValue(0)));
			org_pos.setPos_id(Integer.parseInt(attributes.getValue(1)));
			org_posList.add(org_pos);
			
		}
	}

	public void endElement(String uri, String localName, String qName)
			throws SAXException {
//		if (hasAttribute && (attributes != null)) {
//			for (int i = 0; i < attributes.getLength(); i++) {
//				System.out.println(attributes.getQName(0)
//						+ " and its value is : " + attributes.getValue(0));
//			}
//		}
	}

//	public void characters(char[] ch, int start, int length)
//			throws SAXException {
//		System.out.println((new String(ch, start, length))+"  :here");
//	}
	public List<Position> getPosList() {
		return posList;
	}
	public void setPosList(List<Position> posList) {
		this.posList = posList;
	}
	public List<Org_pos> getOrg_posList() {
		return org_posList;
	}
	public void setOrg_posList(List<Org_pos> org_posList) {
		this.org_posList = org_posList;
	}
	public List<Organization> getOrgList() {
		return orgList;
	}
	public void setOrgList(List<Organization> orgList) {
		this.orgList = orgList;
	}
}

最后，写出来程序入口即可
SaxParse.java

package parseXML;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
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 SaxParse {

	/**
	 * 采用SAX解析
	 */
	public SaxParse() {
		SAXParserFactory saxfac = SAXParserFactory.newInstance();
		try {
			SAXParser saxparser = saxfac.newSAXParser();
			InputStream is = new FileInputStream(
					"C:\\workspace\\Lab\\src\\parseXML\\rbac.xml");
			ParseOrg parseOrg=new ParseOrg();
			saxparser.parse(is, parseOrg);//重点
			
			/**
			 * 全部存到list里了
			 */
			List<Organization> orgList=new ArrayList<Organization>();
			orgList=parseOrg.getOrgList();
			for(int i=0;i<orgList.size();i++){
				System.out.println(orgList.get(i)+" : orglist");
			}
			
			/**
			 * 全部存到list里了
			 */
			List<Position> posList=new ArrayList<Position>();
			posList=parseOrg.getPosList();
			for(int i=0;i<posList.size();i++){
				System.out.println(posList.get(i)+" : posList");
			}
			
			/**
			 * 全部存到list里了
			 */
			List<Org_pos> org_posList=new ArrayList<Org_pos>();
			org_posList=parseOrg.getOrg_posList();
			for(int i=0;i<org_posList.size();i++){
				System.out.println(org_posList.get(i)+" : org_posList");
			}
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		new SaxParse();
	}

}

总结：功能已经实现...输出也很漂亮...当然只针对Organization进行了处理..剩下两个的输出样式不再啰嗦了..

输出结果：

********************************
       Organization :
********************************
id is : 1
nameis : 华迪
nois : A0
innernois : 8790-C9B2-7B08-46FD-A4F8-4157-AD25-5F7B
superiororgis : 0
virflagis : 0
statusis : 0
7  :attributes length
......
********************************
         position :
********************************
id is : 1
nameis : 用户
nois : A1.1
owneris : 
4  :attributes length
.....
********************************
         org-pose :
********************************
orgid is : 2
posidis : 1
2  :attributes length

上述结果省略了很多...
具体效果还是执行一下程序，从控制台观看吧...