SimpleXML框架：带元素或文本的元素 [英] SimpleXML framework: element with element or text

问题描述

我必须解析XML，它可以有两种形式：

I must to parse XML which can have two forms:

<Command><Variable/></Command>

或：

<Command>some text</Command>

我该怎么做？当我尝试在负责命令的类中声明 @Element 和 @Text 时解析当我尝试将XML解析为此类的实例时抛出异常。

How can I do this? When I try to declare both @Element and @Text in class responsible for Command parsing then exception is thrown when I try to parse XML to instance of this class.

我当前的代码版本：

@Root(name = "Command", strict = false)
public class AppCommand {

    @Element(name = "Variable", required = false)
    @Getter
    private Variable variable;

    @Text(required = false)
    @Getter
    private String content;

}

例外是：文本注释@ org.simpleframework.xml.Text（required = false，empty =，data = false）字段'content'私有java.lang.String com.example.AppCommand.content与类中的元素一起使用com.example.AppCommand

推荐答案

我的解决方案（不漂亮，但有效，不需要很多工作要实现）：

My solution (not beautiful, but works and doesn't require much work to implement):

    private static class SerializerWithPreprocessor extends Persister {

        public SerializerWithPreprocessor(RegistryMatcher matcher, Format format) {
            super(matcher, format);
        }

        @Override
        public <T> T read(Class<? extends T> type, String source) throws Exception {
            source = source.replaceFirst("<Command (.*)>([[\\w||[+=]]&&[^<>]]+)</Command>", "<Command $1><Content>$2</Content></Command>");
            return super.read(type, source);
        }
    }

所以我刚创建了新的Serializer类。此类使用正则表达式将 Command 中的 Text 元素更改为普通元素。然后我可以使用：

So I just created new Serializer class. This class use regular expressions to change Text element inside Command into normal Element. Then I can use:

@Root(name = "Command", strict = false)
public class AppCommand {

    @Element(name = "Variable", required = false)
    @Getter
    private Variable variable;

    @Element(name = "Content", required = false)
    @Getter
    private String content;
}

在反序列化期间，一切都像我想要的那样。

and during deserialization everything works like I wanted to.

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