Question

我有一个带Jackson注释的POJO：

public class Person {
    @JsonProperty("first_name")
    private String firstName;

    @JsonProperty("last_name")
    private String lastName;

    public String getFirstName() {
        return this.firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return this.lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

}

然后我创建了一个Person实例＆amp;将其解析为json字符串：

Person p = new Person();
p.setFirstName("John");
p.setLastName("Smith");

//parse to json string
ObjectMapper mapper = new ObjectMapper();
String personJson = mapper.writeValueAsString(p);

但我得到的json字符串（personJson）如下：

{"first_name":"John","last_name":"Smith","firstName":"John","lastName":"Smith"}

为什么我会获得重复的字段“first_name”＆amp; “firstName”，以及“last_name”＆amp; JSON字符串中的“lastName”？

=====更新===

我也尝试过：

注释：

@JsonAutoDetect(fieldVisibility = JsonAutoDetect.Visibility.ANY, getterVisibility = JsonAutoDetect.Visibility.NONE,
        setterVisibility = JsonAutoDetect.Visibility.NONE, creatorVisibility = JsonAutoDetect.Visibility.NONE,
        isGetterVisibility = JsonAutoDetect.Visibility.NONE)

ObjectMapper：

ObjectMapper mapper = new ObjectMapper();
    mapper.getSerializationConfig().getDefaultVisibilityChecker()
            .withFieldVisibility(JsonAutoDetect.Visibility.ANY)
            .withGetterVisibility(JsonAutoDetect.Visibility.NONE)
            .withSetterVisibility(JsonAutoDetect.Visibility.NONE)
            .withCreatorVisibility(JsonAutoDetect.Visibility.NONE);

但我仍然在其他一些POJO中获得JSON中的重复属性......

Answer 1

我自己设法解决了这个问题。

我在UPDATE之后仍然在JSON中有重复字段的原因是我的另一个POJO中存在布尔属性，这产生了以＆＃34开头的访问器方法; 是＆＃34; ， e.g：

public class Other {
   @JsonProperty("money_paid")
   private boolean moneyPaid;

   public boolean isMoneyPaid() {
    return moneyPaid;
   } 
   ... 
}

因此，生成的json包含{money_paid：true，moneyPaid：true}。为了摆脱它，我在mapper setVisibilityChecker时添加了一个限制，这是：{/ p>

.withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)

使用Jackson：在json字符串中获取重复字段

1 个答案: