SAX 解析和特殊字符

2022-01-10 00:00:00 xml-parsing java saxparser

我想使用 SAX 解析器从 xml 文件中解析一些数据.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>

为了解析这些数据，我扩展了 DefaultHandler.

In order to parse this data I extend DefaultHandler.

解析后的输出为:

cat 1 = Pies

cat 2 = &

cat 3 = past

cat 4 = Fruits

为什么会发生这种情况而不是得到:

Why is this happening instead of getting:

cat 1 = Pies & past

cat 2 = Fruits

推荐答案

我的猜测是，您将对 characters 的每次调用都视为为 cat 提供完整的文本元素.您应该对处理程序进行编码，以便对 characters 的连续调用累积文本，并且仅在 endElement 事件中捕获它:

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);
    }

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