Spring3.2中返回JSON去掉Bean中NULL值

最新推荐文章于 2024-08-01 15:15:40 发布

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#spring #json #null值

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本文介绍如何在Spring 3.2中使用Jackson库过滤JSON字符串中值为null的字段。通过在实体类上添加@JsonSerialize注解并设置Inclusion.NON_NULL参数，可以实现在序列化过程中忽略null值。

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在Spring3.2中返回Json字符串，过滤掉不需要的Bean中属性对应Json中key的value=null的值，可以同过在Bean中加入注解的方式来过滤

使用jackson-all-1.8.1.jar包，在需要序列化输出Json的类上添加如下注解

import org.codehaus.jackson.map.annotate.JsonSerialize;
 
@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)
public class BookMark {
     
    private  String  markId;
     
    private  String title;
     
    private String umName;
     
    private String node;
 
    public String getMarkId() {
        return markId;
    }
 
    public void setMarkId(String markId) {
        this.markId = markId;
    }
 
    public String getTitle() {
        return title;
    }
 
    public void setTitle(String title) {
        this.title = title;
    }
 
    public String getNode() {
        return node;
    }
 
    public void setNode(String node) {
        this.node = node;
    }
 
    public String getUmName() {
        return umName;
    }
 
    public void setUmName(String umName) {
        this.umName = umName;
    }
     
}

加入过滤null值注解之前返回

[{"umName":null,"markId":"3","title":"书签1","node":null},
{"umName":null,"markId":"4","title":"书签2","node":null},
{"umName":null,"markId":"5","title":"书签3","node":null},
{"umName":null,"markId":"6","title":"书签5","node":null},
{"umName":null,"markId":"7","title":"书签4","node":null}]

加入注解之后返回

[{"markId":"3","title":"书签1"},{"markId":"4","title":"书签2"},
 {"markId":"5","title":"书签3"},{"markId":"6","title":"书签5"},
 {"markId":"7","title":"书签4"}]