java - Jackson 序列化类文字

Question

我有一个类:

package my.package;
public class TreeItem{
    ...
}

当我想序列化像 TreeItem.class 这样的类文字时， jackson 将其序列化为:

"class my.package.TreeItem"  

我想将其序列化为

"my.package.TreeItem"

编辑:

public class TreeConfigMap extends HashMap<Class<? extends TreeItem>, Map<String, Object>>{
  //empty
}

TreeController:(休息 Controller )

@RequestMapping("/config")
public TreeConfigMap config(...){
  TreeConfigMap config= new TreeConfigMap();
  Map<String,Object> m = new HashMap<>();
  m.put("ali","gholi");
  config.put(TreeItem.class,m);
  return config;
}

输出为:

{"class my.package.TreeItem":{"ali":"gholi"}}

Answer 1

您可以使用自定义 key 序列化程序。

注释您的 TreeConfigMap 以使用自定义 key 序列化程序

@JsonSerialize(keyUsing = ClassNameSerializer.class)
public static class TreeConfigMap extends HashMap<Class<? extends TreeItem>, Map<String, Object>>{
      //empty
}

或者，您可以使用 ObjectMapper 注册序列化器

    ObjectMapper mapper = new ObjectMapper();
    SimpleModule simpleModule = new SimpleModule();
    simpleModule.addKeySerializer(Class.class, new ClassNameSerializer());
    mapper.registerModule(simpleModule);
    ...
    mapper.writeValueAsString(treeConfigMap)

这是序列化器代码

public static class ClassNameSerializer extends JsonSerializer<Class> {
    @Override
    public void serialize(Class value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
        jgen.writeFieldName(value.getCanonicalName());
    }
}