ObjectMapper限制

Question

ObjectMapper是否應該使用只有私有成員，沒有構造函數和沒有getter/setter的類？

我試過了，但並沒有解決問題。

mapper.setVisibility(JsonMethod.FIELD, JsonAutoDetect.Visibility.ANY); 

Answer 1

http://www.baeldung.com/jackson-field-serializable-deserializable-or-not

static class MyDtoAccessLevel { 
    private String stringValue = "hidden"; 
} 

public static void main(String[] args) throws JsonProcessingException { 
    ObjectMapper mapper = new ObjectMapper(); 
    mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY); 
    MyDtoAccessLevel dtoObject = new MyDtoAccessLevel(); 
    System.out.println(mapper.writeValueAsString(dtoObject)); 
    //prints {"stringValue":"hidden"} 
}