mirror of https://gitee.com/makejava/EasyCode.git
再次优化克隆工具类,实现java序列化克隆与json序列化克隆两种方式。
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@ -1,8 +1,14 @@
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package com.sjhy.plugin.tool;
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import com.fasterxml.jackson.annotation.JsonIgnore;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.intellij.util.ExceptionUtil;
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import com.intellij.util.ReflectionUtil;
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import java.io.*;
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import java.lang.reflect.Field;
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import java.util.List;
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import java.util.Objects;
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/**
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* 克隆工具类,实现原理通过JSON序列化反序列化实现
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@ -11,6 +17,7 @@ import java.io.*;
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* @version 1.0.0
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* @since 2018/07/17 13:10
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*/
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@SuppressWarnings("unchecked")
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public final class CloneUtils {
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/**
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* 禁用构造方法
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@ -20,20 +27,19 @@ public final class CloneUtils {
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}
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/**
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* 实体对象克隆方法
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* 通过java序列化方式进行克隆
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*
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* @param entity 实体对象
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* @return 克隆后的实体对象
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*/
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@SuppressWarnings("unchecked")
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public static <E> E clone(E entity) {
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public static <E> E cloneBySerial(E entity) {
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if (entity == null) {
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return null;
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}
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// 定义一个缓冲输出流对象
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ByteArrayOutputStream buffer = new ByteArrayOutputStream();
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ObjectInputStream input = null;
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try(ObjectOutputStream out = new ObjectOutputStream(buffer)) {
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try (ObjectOutputStream out = new ObjectOutputStream(buffer)) {
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// 将对象输出到缓冲区
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out.writeObject(entity);
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// 重新从缓冲区读取对象
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@ -54,4 +60,62 @@ public final class CloneUtils {
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}
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return null;
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}
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/**
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* 通过JSON序列化方式进行克隆
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*
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* @param entity 实例对象
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* @param copy 是否复制被忽略的属性
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* @return 克隆后的实体对象
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*/
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public static <E> E cloneByJson(E entity, boolean copy) {
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if (entity == null) {
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return null;
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}
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ObjectMapper objectMapper = new ObjectMapper();
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try {
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// 进行序列化
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String json = objectMapper.writeValueAsString(entity);
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// 进行反序列化
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E result = (E) objectMapper.readValue(json, entity.getClass());
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// 复制被忽略的属性
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if (copy) {
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copyIgnoreProp(entity, result);
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}
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return result;
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} catch (IOException e) {
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ExceptionUtil.rethrow(e);
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}
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return null;
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}
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/**
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* 复制属性
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*
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* @param oldEntity 就实体
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* @param newEntity 新实例
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*/
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private static void copyIgnoreProp(Object oldEntity, Object newEntity) {
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// 类型不一样直接返回
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if (!Objects.equals(oldEntity.getClass(), newEntity.getClass())) {
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return;
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}
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// 获取所有字段
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List<Field> fieldList = ReflectionUtil.collectFields(oldEntity.getClass());
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if (CollectionUtil.isEmpty(fieldList)) {
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return;
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}
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fieldList.forEach(field -> {
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if (field.getAnnotation(JsonIgnore.class) != null) {
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// 设置允许访问
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field.setAccessible(true);
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// 复制字段
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try {
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field.set(newEntity, field.get(oldEntity));
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} catch (IllegalAccessException e) {
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ExceptionUtil.rethrow(e);
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}
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}
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});
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}
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}
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