Jackson Json序列化:删除空白字符串 [英] Jackson Json Serialization : Remove Blank strings

问题描述

我正在尝试使用杰克逊从生成的Json中排除所有空白字符串.

I am trying to exclude all Blank Strings from the resulting Json using Jackson.

我知道我可以使用下面的注释来对此进行过滤，但这似乎无法处理空白字符串.[仅带有空格的字符串]

I understand I can use below annotation to filter this, but this does not seem to handle Blank Strings.[Stings with just white spaces]

@JsonInclude(JsonInclude.Include.NON_EMPTY) 

有没有办法做到这一点?

Is there a way to do this ?

推荐答案

您可以使用自定义值过滤器，请尝试使用此方法，并让我知道它是否对您有用-

You can use custom value filter, Please try this and let me know if this works for you -

@JsonInclude(value = JsonInclude.Include.CUSTOM, valueFilter = CustomFilter.class)

这是自定义过滤器-

class CustomFilter {
    public CustomFilter() {
    }
    @Override
    public boolean equals(Object obj) {
        if(obj == null)
            return true;
        if(obj instanceof String){
            return ((String)obj).trim().isEmpty();
        }
        return false;
    }
}

---

根据CUSTOM过滤器的javadoc-

---

As per the javadoc of CUSTOM filter -

public static final JsonInclude.Include CUSTOM

该值指示单独的 filter 对象(由JsonInclude.valueFilter()用于值本身，和/或JsonInclude.contentFilter()用于结构化类型的内容)用于确定纳入标准.过滤对象的equals()用值调用方法进行序列化；如果返回true，则值为排除(即过滤掉)；如果包含错误值.

Value that indicates that separate filter Object (specified by JsonInclude.valueFilter() for value itself, and/or JsonInclude.contentFilter() for contents of structured types) is to be used for determining inclusion criteria. Filter object's equals() method is called with value to serialize; if it returns true value is excluded (that is, filtered out); if false value is included.

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