How to solve the problem that java only returns some fields in the entity class
How to return only some fields in the entity class
Add annotations on the entity class
@JsonInclude(JsonInclude.Include.NON_EMPTY)
Indicates that null, empty strings, empty collection arrays, etc. in the entity class will not be Serialization, that is, fields and values will not be returned.
The following is an introduction to all values of annotations
ALWAYS // 默认策略,任何情况都执行序列化 NON_NULL // 非空 NON_ABSENT // null的不会序列化,但如果类型是AtomicReference,依然会被序列化 NON_EMPTY // null、集合数组等没有内容、空字符串等,都不会被序列化 NON_DEFAULT // 如果字段是默认值,就不会被序列化 CUSTOM // 此时要指定valueFilter属性,该属性对应一个类,用来自定义判断被JsonInclude修饰的字段是否序列化 USE_DEFAULTS // 当JsonInclude在类和属性上都有时,优先使用属性上的注解,此时如果在序列化的get方法上使用了JsonInclude,并设置为USE_DEFAULTS,就会使用类注解的设置
java dynamically adds entity class fields and returns them to the front end
Tool class
package com.bless.wms.utils; import lombok.extern.slf4j.Slf4j; import org.apache.commons.beanutils.PropertyUtilsBean; import org.springframework.cglib.beans.BeanGenerator; import org.springframework.cglib.beans.BeanMap; import java.beans.PropertyDescriptor; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import java.util.Map; /** * 动态添加实体类字段 */ @Slf4j public final class PropertyAppender { private static final class DynamicBean { private Object target; private BeanMap beanMap; private DynamicBean(Class superclass, Map<String, Class> propertyMap) { this.target = generateBean(superclass, propertyMap); this.beanMap = BeanMap.create(this.target); } private void setValue(String property, Object value) { beanMap.put(property, value); } private Object getValue(String property) { return beanMap.get(property); } private Object getTarget() { return this.target; } /** * 根据属性生成对象 */ private Object generateBean(Class superclass, Map<String, Class> propertyMap) { BeanGenerator generator = new BeanGenerator(); if (null != superclass) { generator.setSuperclass(superclass); } BeanGenerator.addProperties(generator, propertyMap); return generator.create(); } } public static Object generate(Object dest, Map<String, Object> newValueMap) throws InvocationTargetException, IllegalAccessException { PropertyUtilsBean propertyUtilsBean = new PropertyUtilsBean(); //1.获取原对象的字段数组 PropertyDescriptor[] descriptorArr = propertyUtilsBean.getPropertyDescriptors(dest); //2.遍历原对象的字段数组,并将其封装到Map Map<String, Class> oldKeyMap = new HashMap<>(); for (PropertyDescriptor it : descriptorArr) { if (!"class".equalsIgnoreCase(it.getName())) { oldKeyMap.put(it.getName(), it.getPropertyType()); newValueMap.put(it.getName(), it.getReadMethod().invoke(dest)); } } //3.将扩展字段Map合并到原字段Map中 newValueMap.forEach((k, v) -> oldKeyMap.put(k, v.getClass())); //4.根据新的字段组合生成子类对象 DynamicBean dynamicBean = new DynamicBean(dest.getClass(), oldKeyMap); //5.放回合并后的属性集合 newValueMap.forEach((k, v) -> { try { dynamicBean.setValue(k, v); } catch (Exception e) { log.error("动态添加字段【值】出错", e); } }); return dynamicBean.getTarget(); } }
Call
Front-end interface call test
Note: The front-end form can be dynamically rendered directly in a for loop
The above is the detailed content of How to solve the problem that java only returns some fields in the entity class. For more information, please follow other related articles on the PHP Chinese website!

在使用Netty开发WebSocket服务器时,可能会遇到浏览器在尝试连接时未能正确处理服务器返回的401状态码的情况。 �...

Java compilation failed: Running window javac command cannot generate class file Many Java beginners will encounter this problem during the learning process: running window...

Discussing the hierarchical architecture problem in back-end development. In back-end development, common hierarchical architectures include controller, service and dao...

Packages and Directories in Java: The logic behind compiler errors In Java development, you often encounter problems with packages and directories. This article will explore Java in depth...

Leetcode ...

JWT and Session Choice: Tradeoffs under Dynamic Permission Changes Many Beginners on JWT and Session...

How to correctly configure apple-app-site-association file in Baota nginx? Recently, the company's iOS department sent an apple-app-site-association file and...

How to understand the classification and implementation methods of two consistency consensus algorithms? At the protocol level, there has been no new members in the selection of consistency algorithms for many years. ...


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SublimeText3 English version
Recommended: Win version, supports code prompts!

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.