Xstream出错

Question

我遇到了以下错误：

Security framework of XStream not initialized, XStream is probably vulnerable.
Exception in thread "main" com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter$UnknownFieldException: No such field GameList.Game
---- Debugging information ----
message             : No such field GameList.Game
field               : Game
class               : GameList
required-type       : GameList
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path                : /GameList/Game
line number         : 2
version             : not available
-------------------------------
        at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.handleUnknownField(AbstractReflectionConverter.java:524)
        at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:375)
        at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:281)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
        at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:70)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
        at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1486)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1466)
        at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1337)
        at Start.main(Start.java:11)

我试图在GameList.xml文件的GameList中获取游戏对象，但是，它总是返回这个错误。

Start.java (主代码)：

import com.thoughtworks.xstream.*;
import java.io.*;
import java.util.*;

public class Start {
    public static void main(String[] args)throws FileNotFoundException{

        XStream xstream = new XStream();
        FileReader reader = new FileReader("Games.xml");
        GameList gamelist = new GameList();
        gamelist.setGames((ArrayList<Game>) xstream.fromXML(reader));

        xstream.alias("Game", Game.class);
        xstream.alias("Games", GameList.class);
        xstream.addImplicitCollection(GameList.class, "Games", Game.class);


    }
}

GameList.java代码：

import java.util.*;

public class GameList {

    private ArrayList<Game> Games = new ArrayList<>();

    public void setGames(ArrayList<Game> Games2){

        Games.clear();
        Games2 = Games;
    }

}

Game.java代码：

public class Game {

    private int id;
    private String name;
    private String plataforma;

}

我已经设法让Xstream读取不是列表类型的简单xml代码，但是，我现在需要让它读取带有列表的代码。

Answer 1

别名是在您尝试读取XML之后设置的，因此XStream无法理解如何处理包含列表元素的XML。

应在读取XML之前设置列表的别名。请将代码修改如下。

public static void main(String[] args)throws FileNotFoundException {

    XStream xstream = new XStream();
    xstream.alias("Game", Game.class);
    xstream.alias("Games", GameList.class);
    xstream.addImplicitCollection(GameList.class, "Games", Game.class);

    FileReader reader = new FileReader("Games.xml");
    GameList gamelist = new GameList();
    gamelist.setGames((ArrayList<Game>) xstream.fromXML(reader));
}