SAXParserXMLDemo

最新推荐文章于 2021-02-16 17:45:23 发布

Divine_Wrath

最新推荐文章于 2021-02-16 17:45:23 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/Divine_Wrath/article/details/49512259

本文介绍了一个使用SAX解析器解析XML文件的Java示例。该示例展示了如何从Android资源中读取XML文件，并通过SAX解析器将XML数据转换为Java对象集合。具体包括初始化SAX解析器、定义默认处理器、开始和结束文档元素处理等关键步骤。

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package com.example.xml;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

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

import android.content.Context;
import android.content.res.AssetManager;
import android.util.Log;

public class SAXParserXMLDemo {

	private Context context;
	private AssetManager assetManager;

	public SAXParserXMLDemo(Context context) {
		super();
		this.context = context;
	}

	public InputStream writeXML(String xmlName) throws Exception{
		InputStream inputStream=null;
		assetManager = context.getAssets();
		inputStream=assetManager.open(xmlName);
		return inputStream;
	}
	public void readXML(InputStream inputStream) throws Exception{
		SAXParserFactory saxParserFactory=SAXParserFactory.newInstance();
		SAXParser saxParser=saxParserFactory.newSAXParser();
		SAXHandle saxHandle=new SAXHandle("book");
		saxParser.parse(inputStream, saxHandle);
		List<Map<String, String>> list=saxHandle.rr();
		Log.i("aa", list.size()+"");
	}
}
class SAXHandle extends DefaultHandler{

	private List<Map<String, String>> listMap=null;
	private Map<String, String> map=null;
	private String currentTag;
	private String currentValue;
	private String rootName;

	public SAXHandle(String rootName) {
		super();
		this.rootName = rootName;
	}

	@Override
	public void startDocument() throws SAXException {
		listMap=new ArrayList<Map<String,String>>();
	}

	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if (qName.equals(rootName)) {
			map=new HashMap<String, String>();
		}
		currentTag=qName;
	}

	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		if (currentTag!=null&&map!=null) {
			currentValue=new String(ch, start, length);
			if (currentValue!=null&&!currentValue.trim().equals("")&&!currentValue.trim().equals("\n")) {
				map.put(currentTag, currentValue);
			}
		}
		currentTag=null;
		currentValue=null;
	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if (qName.equals(rootName)) {
			listMap.add(map);
			map=null;
		}
	}

	@Override
	public void endDocument() throws SAXException {
		// TODO Auto-generated method stub
		super.endDocument();
	}
	public List<Map<String, String>> rr(){
		return listMap;
	}

}