想要隐藏杰克逊映射到JSON的对象的某些字段 [英] Want to hide some fields of an object that are being mapped to JSON by Jackson

问题描述

我有一个User类要使用Jackson映射到JSON。

I have a User class that I want to map to JSON using Jackson.

public class User {
    private String name;
    private int age;
    prviate int securityCode;

    // getters and setters
}

我映射此使用 -

User user = getUserFromDatabase();

ObjectMapper mapper = new ObjectMapper();   
String json =  mapper.writeValueAsString(user);

我不想映射 securityCode 变量。有没有办法配置映射器以便它忽略这个字段？

I don't want to map the securityCode variable. Is there any way of configuring the mapper so that it ignores this field?

我知道我可以编写自定义数据映射器或使用Streaming API但是我想知道是否可以通过配置来实现吗？

I know I can write custom data mappers or use the Streaming API but I would like to know if it possible to do it through configuration?

推荐答案

您有两种选择：

1. 杰克逊的工作场所是吸气者。因此，您可以删除要在JSON中省略的字段的getter。 （如果你不需要在其他地方使用getter。）

1. Jackson works on setters-getters of fields. So, you can just remove getter of field which you want to omit in JSON. ( If you don't need getter at other place.)

或者，你可以使用 @JsonIgnore 杰克逊的注释关于该字段的getter方法，你会看到没有这样的键值对结果JSON。

Or, you can use the @JsonIgnore annotation of Jackson on getter method of that field and you see there in no such key-value pair in resulted JSON.

@JsonIgnore
public int getSecurityCode(){
   return securityCode;
}

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