Java Sax Parser 只返回一行标记 [英] Java Sax Parser only returning one line of a tag

问题描述

我试图解析 xml 中的描述标签，但它只输出一行:

I am trying to parse the description tag in the xml but it only outputs one line:

description: <img src=http://www.ovations365.com/sites/ovations365.com/images/event/441705771/sparkswebsite_medium.jpg alt="SPARKS: Understanding Energy">

这只是 CDATA 中文本的一小部分，我正在尝试输出多个项目的描述.为什么我无法获取整个 CDATA?

That is only a small part of the text in the CDATA and I'm trying to output the description for multiple items. Why can't I get the whole CDATA?

XML 位于:http://feeds.feedburner.com/Events-Ovations365

package com.example.ovations_proj;

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

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

import com.example.ovations_proj.RssItem;


public class RssParseHandler extends DefaultHandler {

    private List<RssItem> rssItems;

    // Used to reference item while parsing
    private RssItem currentItem;

    // Parsing title indicator
    private boolean parsingTitle; 
    // Parsing link indicator
    private boolean parsingLink; 
    private boolean parsingDes;


    public RssParseHandler() {
        rssItems = new ArrayList<RssItem>();
    }

    public List<RssItem> getItems() {
        return rssItems;
    }

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        System.out.println("Start Element :" + qName);
        if ("item".equals(qName)) { //item
            currentItem = new RssItem();
        } else if ("title".equals(qName)) { //title
            parsingTitle = true;
        } else if ("link".equals(qName)) { //link
            parsingLink = true;
        }else if ("description".equals(qName) ) { //description
            parsingDes = true;
        }

    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        System.out.println("End Element :" + qName);
        if ("item".equals(qName)) {
            rssItems.add(currentItem);//item
            currentItem = null;         
        } else if ("title".equals(qName)) {//title
            parsingTitle = false;
        } else if ("link".equals(qName)) {//link
            parsingLink = false;
        } else if ("description".equals(qName) ) {  //description

            parsingDes = false;         
        }
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        if (parsingTitle) {
            if (currentItem != null){
                currentItem.setTitle(new String(ch, start, length));                
            }
        } else if (parsingLink) { 
            if (currentItem != null) {
                currentItem.setLink(new String(ch, start, length));
                parsingLink = false;
            }
        } else if (parsingDes) {       
            if (currentItem != null) {                      
                currentItem.setDes(new String(ch, start, length));
                System.out.println("description:  "  + currentItem.getDes());
                parsingDes = false;
            }
        }
    }
}

推荐答案

部分中的字符数据似乎正在发送多个块，即多次调用 characters 方法.

It seems that the character data in the <![CDATA[...]]> sections is being sent in multiple chunks, i.e. in multiple calls to the characters method.

characters 方法的 ContentHandler 文档 提到 SAX 解析器可以随意执行此操作:

The ContentHandler documentation for the characters method mentions that SAX parsers are free to do this:

SAX 解析器可能会在单个块中返回所有连续的字符数据，也可能会将其拆分为多个块[....]

SAX parsers may return all contiguous character data in a single chunk, or they may split it into several chunks[....]

因此，您需要调整 characters 方法以处理对同一块连续字符数据的多次调用.

You'll therefore need to adjust your characters method to handle being called multiple times for the same chunk of contiguous character data.

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