問(wèn)題描述

我想使用 SAX 解析器從 xml 文件中解析一些數(shù)據(jù).我的xml如下:

I want to parse some data from an xml file using SAX parser. My xml is as follows:

<categories>
 <cat>Pies &amp; past</cat>
 <cat>Fruits</cat>
</categories>

為了解析這些數(shù)據(jù)，我擴(kuò)展了 DefaultHandler.

In order to parse this data I extend DefaultHandler.

解析后的輸出為:

cat 1 = Pies

cat 2 = &

cat 3 = past

cat 4 = Fruits

為什么會(huì)發(fā)生這種情況而不是得到:

Why is this happening instead of getting:

cat 1 = Pies & past

cat 2 = Fruits

推薦答案

我的猜測(cè)是，您將對(duì) characters 的每次調(diào)用都視為為 cat 提供完整的文本元素.您應(yīng)該對(duì)處理程序進(jìn)行編碼，以便對(duì) characters 的連續(xù)調(diào)用累積文本，并且僅在 endElement 事件中捕獲它:

My guess is that you are treating each call to characters as delivering the complete text for a cat element. You should code your handler so that successive calls to characters accumulate the text, and you only capture it on the endElement event:

public class CatHandler extends DefaultHandler {
    private StringBuilder chars = new StringBuilder();

    public void startElement(String uri, String lName, String qName, Attributes a)
    {
        final String name = qName == null ? lName : qName;
        if ("cat".equals(name)) {
            chars.setLength(0);
        } else . . .
    }

    public void endElement(String uri, String lName, String qName) {
        final String name = qName == null ? lName : qName;
        if ("cat".equals(name)) {
            String catName = chars.toString();
            // do something with cat name
        } else . . .
    }

    public void characters(char[] ch, int start, int length) {
        chars.append(ch, start, length);
    }

這篇關(guān)于SAX 解析和特殊字符的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！