Jackson@JsonIgnore属性为空

Question

{"receive":1413342268310}

public class PositionBean {  
    private Long id;
    private Date receive;

    public void setReceive (Date receive) {
        this.receive = receive;
    }

    public void setReceive (Long receive) {
        this.receive = new Date (receive);
    }

    public Long getReceive () {
        return receive.getTime ();
    }
}

我必须在其他类中使用的所有set和get方法，所以我不能删除一个方法。当我召唤

objectMapper.readValue(str, PositionBean.class);

它提示异常，jackon不知道设置了哪个方法，所以我使用了@jsonignore，但我发现receive是null。

Answer 1

您可以使用注释@JsonSetter来指定应该使用哪个方法作为setter。

示例：

public class PositionBean {  
    private Long id;
    private Date receive;

    public void setReceive (Date receive) {
        this.receive = receive;
    }

    @JsonSetter
    public void setReceive (Long receive) {
        this.receive = new Date (receive);
    }

    public Long getReceive () {
        return receive.getTime ();
    }
}  

当您用@jsonIgnore标记setter（例如setXXX)时，表示属性XXX将被忽略。
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