@JsonInclude(Include.NON_NULL)

项目框架：spring+springMVC+mybatis

@JsonInclude(Include.NON_NULL)的作用：jackson 实体转json 为NULL的字段不参加序列化（即不显示）

实体类：

package com.baidu.entity;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import org.springframework.data.annotation.Transient;

import java.io.Serializable;

public class User implements Serializable{
    private static final long serialVersionUID = 8121761080892505330L;
    private String username;
    /*@Transient
    @JsonIgnore*/
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String password; //transient

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

后台返回结果：

页面返回结果：

从图片上可以看出后台返回的实体在转化为json时，字段值为null的字段不显示。