[英]SimpleXML framework: element with element or text
我必須解析XML,它可以有兩種形式:
<Command><Variable/></Command>
要么:
<Command>some text</Command>
我怎樣才能做到這一點? 當我嘗試在負責Command
解析的類中聲明@Element
和@Text
時,當我嘗試將XML解析為此類的實例時會引發異常。
我當前的代碼版本:
@Root(name = "Command", strict = false)
public class AppCommand {
@Element(name = "Variable", required = false)
@Getter
private Variable variable;
@Text(required = false)
@Getter
private String content;
}
唯一的例外是: Text annotation @org.simpleframework.xml.Text(required=false, empty=, data=false) on field 'content' private java.lang.String com.example.AppCommand.content used with elements in class com.example.AppCommand
我的解決方案(雖然不漂亮,但是可以實現並且不需要太多工作來實現):
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);
}
}
因此,我剛剛創建了新的Serializer類。 此類使用正則表達式將Command
Text
元素更改為普通Element
。 然后我可以使用:
@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;
}
在反序列化過程中,一切都按我的意願進行。
是的,Simple無法解決這個問題。
Command.java
:
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;
import org.simpleframework.xml.Text;
@Root
public class Command {
@Element(required = false, name = "Variable")
private Variable variable;
@Text(required = false)
private String text;
}
Variable.java
:
class Variable {
}
SOPlayground.java
:
import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;
public class SOPlayground {
public static void main(String[] args) throws Exception {
Serializer serializer = new Persister();
String xml1 = "<Command><Variable/></Command>";
String xml2 = "<Command>some text</Command>";
serializer.validate(Command.class, xml1);
serializer.validate(Command.class, xml2);
}
}
這會編譯,但不會運行:
Exception in thread "main" org.simpleframework.xml.core.TextException: Text annotation @org.simpleframework.xml.Text(data=false, required=false, empty=) on field 'text' private java.lang.String de.lhorn.so.Command.text used with elements in class de.lhorn.so.Command
似乎不能同時擁有@Element
和@Text
成員。
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