用xom包编写<![CDATA[]]>段备忘

xom-1.1.jar包是一个操作xml文件的jar包，利用该jar包可以很方便的操作xml文件。但是，该.jar包中并没有现成的生成xml的<![CDATA[]]>段的函数。在经过查了许多网上资料后，该官方网站好像是说<![CDATA[]]>段不安全，经常被人误用，所以不提供生成<![CDATA[]]>段的函数。但与此同时，在官网上一个国外网友，利用xom包现有的函数，写了一个生成<![CDATA[]]>段的类，来对官网的解释表示抗议。特此记录如下，代码比较简单，就不解释了。


import java.io.IOException;
import java.io.StringReader;

import nu.xom.Builder;
import nu.xom.Document;
import nu.xom.ParsingException;
import nu.xom.Text;

/**
* 创建CDATA段的辅助类
*/
public class CDATAFactory
{
private static final Text PROTOTYPE;  // this is really an instance of CDATASection

static
{
    Text temp = null;

    try
    {
        // XOM preserves existing CDATA's so start with a doc that has one
        String docWithCDATA = "<text><![CDATA[prototype]]></text>";

        Builder builder = new Builder();
        Document document = builder.build(new StringReader(docWithCDATA));

        // grab the resulting CDATASection and keep it around as a prototype
        temp = (Text) document.getRootElement().getChild(0);
        temp.detach();
    }
    catch (IOException e)
    {
        // not worried about IOExceptions just reading a string
    }
    catch (ParsingException e)
    {
        // already know this document is valid and will parse
    }

    PROTOTYPE = temp;
}

public static Text makeCDATASection(String value)
{
    // use copy and setValue to get a brand new CDATA section
    Text result = (Text) PROTOTYPE.copy();
    result.setValue(value);
    return result;
}
}