我有一个正在使用 Java 开发的字典式应用程序,并且我正在使用 Simple 框架进行序列化。它包括一个字符串的 ArrayList,我遇到的唯一问题是 Simple 将序列化/反序列化这些字符串并将任何空值更改为 null。我从这个问题中了解到您需要使用转换器。我按照该页面上的描述添加了 Sand 在他的答案中写的类(需要“新的 AnnotationStrategy()”更改),现在这就是我遇到问题的主要类的样子(与剥离了众多的 get/set 方法):
public class Item {
@ElementList(name = "itemContents")
@Convert(SimpleXMLStringConverter.class)
private ArrayList<String> values;
public Item()
{
}
}
每当我尝试将类写入 XML 文件时,都会收到此错误:
org.simpleframework.xml.convert.ConvertException: Element annotation required for field 'values' private java.util.ArrayList main.LangComp.Item.values
at org.simpleframework.xml.convert.ConverterScanner.getConvert(ConverterScanner.java:147)
at org.simpleframework.xml.convert.ConverterScanner.getConvert(ConverterScanner.java:121)
at org.simpleframework.xml.convert.ConverterScanner.getConverter(ConverterScanner.java:100)
at org.simpleframework.xml.convert.AnnotationStrategy.write(AnnotationStrategy.java:175)
at org.simpleframework.xml.convert.AnnotationStrategy.write(AnnotationStrategy.java:155)
at org.simpleframework.xml.core.Source.setOverride(Source.java:394)
at org.simpleframework.xml.core.Factory.setOverride(Factory.java:170)
at org.simpleframework.xml.core.Composite.isOverridden(Composite.java:1387)
at org.simpleframework.xml.core.Composite.writeElement(Composite.java:1309)
at org.simpleframework.xml.core.Composite.writeUnion(Composite.java:1194)
at org.simpleframework.xml.core.Composite.writeElements(Composite.java:1165)
at org.simpleframework.xml.core.Composite.writeSection(Composite.java:1071)
at org.simpleframework.xml.core.Composite.write(Composite.java:1042)
at org.simpleframework.xml.core.Composite.write(Composite.java:1019)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:236)
at org.simpleframework.xml.core.CompositeList.write(CompositeList.java:248)
at org.simpleframework.xml.core.Composite.writeElement(Composite.java:1331)
at org.simpleframework.xml.core.Composite.writeElement(Composite.java:1314)
at org.simpleframework.xml.core.Composite.writeUnion(Composite.java:1194)
at org.simpleframework.xml.core.Composite.writeElements(Composite.java:1165)
at org.simpleframework.xml.core.Composite.writeSection(Composite.java:1071)
at org.simpleframework.xml.core.Composite.write(Composite.java:1042)
at org.simpleframework.xml.core.Composite.write(Composite.java:1019)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:236)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:208)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:186)
at org.simpleframework.xml.core.Persister.write(Persister.java:1187)
at org.simpleframework.xml.core.Persister.write(Persister.java:1169)
at org.simpleframework.xml.core.Persister.write(Persister.java:1147)
at org.simpleframework.xml.core.Persister.write(Persister.java:1266)
at org.simpleframework.xml.core.Persister.write(Persister.java:1248)
at org.simpleframework.xml.core.Persister.write(Persister.java:1229)
at org.simpleframework.xml.core.Persister.write(Persister.java:1208)
at main.IO.FileHandler.WriteXML(FileHandler.java:32)
at main.UI.MainUI.formWindowClosing(MainUI.java:108)
at main.UI.MainUI.access$000(MainUI.java:16)
at main.UI.MainUI$1.windowClosing(MainUI.java:76)
at java.awt.Window.processWindowEvent(Window.java:2045)
at javax.swing.JFrame.processWindowEvent(JFrame.java:296)
at java.awt.Window.processEvent(Window.java:2003)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Window.dispatchEventImpl(Window.java:2713)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:680)
at java.awt.EventQueue$4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
我之前能够让这个程序工作,唯一的问题是它会将空字符串变为 null,这是我需要避免的。我不知道是什么导致了问题或如何解决它。是因为我从我链接的问题中得到的转换器类是字符串,而不是 ArrayLists,还是因为 XML 节点是字符串而不是列表而无关紧要?当它说“字段需要元素注释”时,我无法理解它想要什么注释。