Question

我正在尝试序列化一个包含接口对象列表的类。我已经添加了一个类型寄存器，应该让它工作，但是我运气不好，因为它仍然没有工作。代码如下。

规则：

public interface Rule extends Serializable {

    public String getName();

    public boolean setData(String data);
    public String getData();

}

RuleAbstract：

public abstract class RuleAbstract implements Rule {

    private static transient final long serialVersionUID = 1L;

    public RuleAbstract(){ }

}

ActionRule：

public interface ActionRule extends Rule {

    public void doAction(Player player);

}

其中一个ActionRule类：

public class DoCmd extends RuleAbstract implements ActionRule {

    private static transient final long serialVersionUID = 1L;

    private static DoCmd i = new DoCmd();
    public static DoCmd get() { return i; }

    private String cmd;

    public DoCmd(){

    }

    @Override
    public void doAction(Player player) {
        if(this.cmd == null) return;
        MixinCommand.get().dispatchCommand(player, this.cmd);
    }

    @Override
    public boolean setData(String data) {
        /** Must start with leading slash */
        if(!data.startsWith("/")) return false;
        this.cmd = data;
        return true;
    }

    @Override
    public String getData() {
        return this.cmd;
    }

}

最后，必须序列化的班级＆amp;反序列化：

public class RuleList {

    List<Rule> rules = new ArrayList<Rule>();

}

所有这一切都适用于我的类型适配器：

public class AdapterRule implements JsonDeserializer<Rule>, JsonSerializer<Rule> {

    private static AdapterRule i = new AdapterRule();
    public static AdapterRule get() { return i; }

    @Override
    public JsonElement serialize(Rule src, Type typeOf, JsonSerializationContext context) {
        if(src.getData() != null || src.getData() != ""){
            return new JsonPrimitive(String.format("%s %s", src.getName(), src.getData()));
        }
        return new JsonPrimitive(src.getName());
    }

    @Override
    public Rule deserialize(JsonElement src, Type typeOf, JsonDeserializationContext context) throws JsonParseException {
        String splitted[] = src.getAsJsonPrimitive().getAsString().split(" ");
        if(splitted.length == 1){
            return RuleAbstract.getRule(splitted[0]);
        } else {
            String tempData = "";
            for(String data : splitted){
                tempData = tempData + " " + data;
            }
            Rule rule = RuleAbstract.getRule(splitted[0]);
            rule.setData(tempData);
            return rule;
        }
    }

}

有人可以指出我做错了什么吗？我收到错误：

java.lang.RuntimeException: Unable to invoke no-args constructor for interface some.package.Rule. Register an InstanceCreator with Gson for this type may fix this problem.

Answer 1

GSON反序列化器需要在反序列化的类上使用默认构造函数，即RuleList。

如果您不能提供默认构造函数，那么您需要注册一个InstanceCreator，它将为解串器提供一个新的RuleList。

无法序列化/反序列化实现GSON接口的类

1 个答案: