开发笔记 第536页

//设置一个可以定位文档内容事件发生位置的定位器对象

public void setDocumentLocator(Locator locator)

//用于处理文档解析开始事件

public void startDocument()throws SAXException

//处理元素开始事件，从参数中可以获得元素所在名称空间的uri，元素名称，属性类表等信息

public void startElement(String namespacesURI , String localName , String qName , Attributes atts) throws SAXException

//处理元素结束事件，从参数中可以获得元素所在名称空间的uri，元素名称等信息

public void endElement(String namespacesURI , String localName , String qName) throws SAXException

//处理元素的字符内容，从参数中可以获得内容

public void characters(char[] ch , int start , int length)  throws SAXException

//注册处理XML文档解析事件ContentHandler
public void setContentHandler(ContentHandler handler)

//开始解析一个XML文档
public void parse(InputSorce input) throws SAXException

SAXParserFactory factory = SAXParserFactory.newInstance();

SAXParser parser = factory.newSAXParser();

XMLReader reader = parser.getXMLReader();

RSSHandler handler = new RSSHandler();
reader.setContentHandler(handler);

parser.parse(is);

<?xml version="1.0" encoding="UTF-8"?>
    <channel>
        <title>RSS 解析练习</title>
        <description>hehehaha</description>
        <link>http://www.cnblogs.com/felix-hua/</link>
        <language>zh-cn</language>


        <item>
            <title><![CDATA[头条]]></title>
            <link>http://mc.cz001.com.cn/images/menu/23_active.png</link>
            <category>0</category>
            <description>描述详细信息的</description>
            <pubDate>2012-01-09</pubDate>
        </item>
        
        <item>
            <title><![CDATA[新闻]]></title>
            <link>http://mc.cz001.com.cn/images/menu/23_active.png</link>
            <category>0</category>
            <description>描述详细信息的</description>
            <pubDate>2012-01-09</pubDate>
        </item>
        
        <item>
            <title><![CDATA[首页]]></title>
            <link>http://mc.cz001.com.cn/images/menu/23_active.png</link>
            <category>0</category>
            <description>描述详细信息的</description>
            <pubDate>2012-01-09</pubDate>
        </item>
        
        <item>
            <title><![CDATA[财经]]></title>
            <link>http://mc.cz001.com.cn/images/menu/23_active.png</link>
            <category>0</category>
            <description>描述详细信息的</description>
            <pubDate>2012-01-09</pubDate>
        </item>

package com.sax.org.entity;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Vector;

public class RSSFeed {
    private String title;
    private int itemcount;
    private List<RSSItem> itemlist;
    
    public RSSFeed(){
        itemlist = new Vector<RSSItem>(0);
    }
    
    /**
     * 负责将一个RSSItem加入到RSSFeed类中
     * @param item
     * @return
     */
    public int addItem(RSSItem item){
        itemlist.add(item);
        itemcount++;
        return itemcount;
    }
    
    public RSSItem getItem(int location){
        return itemlist.get(location);
    }
    
    public List<RSSItem> getAllItems(){
        return itemlist;
    }
    
    /**
     * 负责从RSSFeed类中生成列表所需要的数据
     * @return
     */
    public List getAllItemForListView(){
        List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();
        int size = itemlist.size();
        for(int i=0 ; i<size ; i++){
            HashMap<String , Object> item = new HashMap<String, Object>();
            item.put(RSSItem.TITLE, itemlist.get(i).getTitle());
            item.put(RSSItem.PUBDATE, itemlist.get(i).getPubdate());
            data.add(item);
        }
        return data;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public int getItemcount() {
        return itemcount;
    }

    public void setItemcount(int itemcount) {
        this.itemcount = itemcount;
    }

    public List<RSSItem> getItemlist() {
        return itemlist;
    }

    public void setItemlist(List<RSSItem> itemlist) {
        this.itemlist = itemlist;
    }
    
}

package com.sax.org.entity;

public class RSSItem {
    public static String TITLE = "title";
    public static String PUBDATE = "pubdate";
    public String title;
    public String description;
    public String link;
    public String category;
    public String pubdate;
    public RSSItem() {
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    public String getLink() {
        return link;
    }
    public void setLink(String link) {
        this.link = link;
    }
    public String getCategory() {
        return category;
    }
    public void setCategory(String category) {
        this.category = category;
    }
    public String getPubdate() {
        return pubdate;
    }
    public void setPubdate(String pubdate) {
        this.pubdate = pubdate;
    }
    
    
}

package com.sax.org.handler;

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

import com.sax.org.entity.RSSFeed;
import com.sax.org.entity.RSSItem;

public class RSSHandler extends DefaultHandler{
    RSSFeed RssFeed;
    RSSItem RssItem;
    final int RSS_TITLE = 1;
    final int RSS_LINK = 2;
    final int RSS_DESCRIPTION = 3;
    final int RSS_CATEGORY = 4;
    final int RSS_PUBDATE = 5;
    int currentstate = 0;
    
    public RSSHandler(){}
    
    public RSSFeed getFeed(){
        return RssFeed;
    }
    
    @Override
    public void startDocument() throws SAXException {
        // TODO Auto-generated method stub
        RssFeed = new RSSFeed();
        RssItem = new RSSItem();
    }
    
    @Override
    public void endDocument() throws SAXException {
        // TODO Auto-generated method stub
        
    }
    
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        // TODO Auto-generated method stub
        if(localName.equals("channel")){
            currentstate = 0;
            return;
        }
        if(localName.equals("item")){
            RssItem = new RSSItem();
            return;
        }
        if(localName.equals("title")){
            currentstate = RSS_TITLE;
            return;
        }
        if(localName.equals("description")){
            currentstate = RSS_DESCRIPTION;
            return;
        }
        if(localName.equals("link")){
            currentstate = RSS_LINK;
            return;
        }
        if(localName.equals("category")){
            currentstate = RSS_CATEGORY;
            return;
        }
        if(localName.equals("pubDate")){
            currentstate = RSS_PUBDATE;
            return;
        }
        currentstate = 0;
    }
    
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        // TODO Auto-generated method stub
        if(localName.equals("item")){
            RssFeed.addItem(RssItem);
            return;
        }
    }
    
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        // TODO Auto-generated method stub
        String theString = new String(ch, start, length);
        switch(currentstate){
        case RSS_TITLE:
            RssItem.setTitle(theString);
            currentstate = 0;
            break;
        case RSS_DESCRIPTION:
            RssItem.setDescription(theString);
            currentstate = 0;
            break;
        case RSS_LINK:
            RssItem.setLink(theString);
            currentstate = 0;
            break;
        case RSS_PUBDATE:
            RssItem.setPubdate(theString);
            currentstate = 0;
            break;
        case RSS_CATEGORY:
            RssItem.setCategory(theString);
            currentstate = 0;
            break;
        default:
            return;
        }
    }
}

package com.sax.org;

import java.io.IOException;
import java.net.URL;

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

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

import com.sax.org.entity.RSSFeed;
import com.sax.org.entity.RSSItem;
import com.sax.org.handler.RSSHandler;

public class SAXReaderActivity extends Activity {
    /** Called when the activity is first created. */

    public String rssUrl = "http://mc.cz001.com.cn/a/indexconfig/index.rss";
    public RSSFeed feed;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        feed = getFeed(rssUrl);
        showList();
    }

    public RSSFeed getFeed(String rssUrl) {
        try {

// 这里我们实现了本地解析，所以注掉了这个取网络数据的。
//            URL url = new URL(rssUrl);
            SAXParserFactory factory = SAXParserFactory.newInstance();
            SAXParser parser = factory.newSAXParser();
            XMLReader reader = parser.getXMLReader();
            RSSHandler handler = new RSSHandler();
            reader.setContentHandler(handler);
            InputSource is = new InputSource(this.getClassLoader().getResourceAsStream("rssxml.xml"));//取得本地xml文件
            reader.parse(is);
            return handler.getFeed();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    public void showList() {
        ListView rsslistview = (ListView) findViewById(R.id.rssList);
        TextView rsstitle = (TextView) findViewById(R.id.rsstitle);
        if (feed == null) {
            rsstitle.setText("访问失败...");
            return;
        }
        SimpleAdapter adapter = new SimpleAdapter(this,
                feed.getAllItemForListView(),
                android.R.layout.simple_list_item_2, new String[] {
                        RSSItem.TITLE, RSSItem.PUBDATE }, new int[] {
                        android.R.id.text1, android.R.id.text2 });
        rsslistview.setAdapter(adapter);
    }
}

{"name":"jifeng","company":"taobao"}

var jsonstr = '{"name":"jifeng","company":"taobao"}';
//eval function
var evalJson = eval('(' + jsonstr + ')');
// JSON.parse function
var JSONParseJson = JSON.parse(jsonstr);

var parse_json_by_eval = function(str){
    return eval('('+str+')');
}

var value = 1;
var jsonstr = '{"name":"jifeng","company":"taobao","value":++value}';
var json1 = parse_json_by_eval(jsonstr);
console.log(json1);
console.log('value: '+ value);

{ name: 'jifeng', company: 'taobao', value: 2 }
value: 2

var parse_json_by_JSON_parse = function(str){
    return JSON.parse(str);
}

value = 1;
var jsonstr = '{"name":"jifeng","company":"taobao","value":++value}';
var json2 = parse_json_by_JSON_parse(jsonstr);
console.log(json2);
console.log(value);

1 public class Son extends Father
2 Son son = new Son();
3 son.method();

1 public Father getFather(){...}  //父类中的方法
2 public Son getFather(){...}     //子类覆盖父类中的getFather()方法

 1 public class Father{
 2     public void method(){
 3         System.out.println("父类方法："+this.getClass());
 4     }
 5 }
 6 public class Son extends Father{
 7     public void method(){
 8        System.out.println("子类方法"+this.getClass());
 9     }
10     public static void main(String[] args){
11         Father instance = new Son();
12         instance.method();
13     }
14 }
15 //结果：子类方法：class Son

public class Father{
    public void method(){
        System.out.println("父类方法："+this.getClass());
    }
}
public class Son extends Father{
    public static void main(String[] args){
        Father instance = new Son();
        instance.method();
    }
}
//结果：父类方法：class Son

 1 public class Father{
 2     public String name = "父亲属性";
 3 }
 4 public class Son extends Father{
 5     public String name = "孩子属性";
 6 
 7     public static void main(String[] args){
 8         Father instance = new Son();
 9         System.out.println(instance.name);
10     }
11 }
12 //结果：父亲属性