[英]Abstract class with Gson serialization/deserialization
我期待从 json 中获得LinkedList<Request>
。 pojo 看起来像这样:
@Data
@Builder
public class Request {
private String id;
private List<Parameter> parameters;
}
@Data
@SuperBuilder
public abstract class Parameter implements Serializable {
private String key;
public abstract Object getValue();
}
@Data
@SuperBuilder
@EqualsAndHashCode(callSuper = true)
public class StringParameter extends Parameter implements Serializable {
private String value;
}
@Data
@SuperBuilder
@EqualsAndHashCode(callSuper = true)
public class PasswordParameter extends Parameter implements Serializable {
private String value;
}
序列化工作正常,它生成 json,但它在反序列化时崩溃(也许它是抽象类或/和我期待LinkedList
和/或 lombok 注释)? 我尝试编写一个 gson 反序列化器(在谷歌上搜索非常标准),但它并没有完成这项工作。
感谢gson-extras
的建议,我设法跳过编写自定义反序列化程序并使用gson-extras
库中的RuntimeTypeAdapterFactory
:
public static void writeObjectToFile(Object object, String filePath) {
RuntimeTypeAdapterFactory<Parameter> parameterAdapterFactory = RuntimeTypeAdapterFactory.of(Parameter.class, "type");
parameterAdapterFactory.registerSubtype(StringParameter.class, "StringParameter");
parameterAdapterFactory.registerSubtype(PasswordParameter.class, "PasswordParameter");
Gson gson = new GsonBuilder().setPrettyPrinting().registerTypeAdapterFactory(parameterAdapterFactory).create();
try {
FileWriter fileWriter = new FileWriter(filePath);
gson.toJson(object, fileWriter);
fileWriter.flush();
fileWriter.close();
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
public static LinkedList<Request> readObjectFromFile(String filePath) {
RuntimeTypeAdapterFactory<Parameter> parameterAdapterFactory = RuntimeTypeAdapterFactory.of(Parameter.class, "type");
parameterAdapterFactory.registerSubtype(StringParameter.class, "StringParameter");
parameterAdapterFactory.registerSubtype(PasswordParameter.class, "PasswordParameter");
Gson gson = new GsonBuilder().setPrettyPrinting().registerTypeAdapterFactory(parameterAdapterFactory).create();
try {
BufferedReader jsonBuffer = new BufferedReader(new FileReader(filePath));
return gson.fromJson(jsonBuffer, new TypeToken<LinkedList<Request>>(){}.getType());
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
}
return null;
}
我也只保留了lombok
注释,并没有为我的 POJO 编写构造函数和 getter/setter
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.