java对象实体类属性字段对比变化过程
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package com.covenlonki.utils;
/**
* 对比结果
*/
public class ComparedResult {
/**
* 对比字段名称
*/
private String fieldName;
/**
* 对比
*/
private String compare;
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = "【" + fieldName + "】";
}
public String getCompare() {
return compare;
}
public void setCompare(String compare) {
this.compare = compare;
}
@Override
public String toString() {
return "ComparedResult{" +
"fieldName='" + fieldName + '\'' +
", compare='" + compare + '\'' +
'}';
}
}
package com.covenlonki.utils;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import java.util.Date;
import java.util.Objects;
/**
* 对比实体类
*/
@Data
public class ComparedEntity {
@ApiModelProperty(name = "姓名")
public String name;
@ApiModelProperty(name = "年龄")
private Integer age;
@ApiModelProperty(name = "修改人ID")
private Integer modifyUserId;
@ApiModelProperty(name = "修改人姓名")
private String modifyUserName;
@ApiModelProperty(name = "修改时间")
private Date modifyTime;
public ComparedEntity() {
}
public ComparedEntity(String name, Integer age) {
this.name = name;
this.age = age;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
ComparedEntity that = (ComparedEntity) o;
return Objects.equals(name, that.name) && Objects.equals(age, that.age) && Objects.equals(modifyUserId, that.modifyUserId) && Objects.equals(modifyUserName, that.modifyUserName) && Objects.equals(modifyTime, that.modifyTime);
}
@Override
public int hashCode() {
return Objects.hash(name, age, modifyUserId, modifyUserName, modifyTime);
}
@Override
public String toString() {
return "ComparedEntity{" +
"name='" + name + '\'' +
", age=" + age +
", modifyUserId=" + modifyUserId +
", modifyUserName='" + modifyUserName + '\'' +
", modifyTime=" + modifyTime +
'}';
}
}
package com.covenlonki.utils;
import cn.hutool.json.JSONUtil;
import io.swagger.annotations.ApiModelProperty;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
/**
* 对比工具
*/
public class ComparedUtil {
public static void main(String[] args) {
ComparedEntity u1=new ComparedEntity();
u1.setName("李师");
u1.setAge(18);
u1.setModifyUserName("admin");
u1.setModifyUserId(666);
ComparedEntity u2=new ComparedEntity();
u2.setName("李师22");
u2.setAge(20);
u2.setModifyUserName("covenlonki");
u2.setModifyUserId(888);
List<ComparedResult> comparedResults = compareTwoObject(u1, u2);
String s = JSONUtil.toJsonStr(comparedResults);
System.out.println(s);
}
/**
* 比较新旧对象内容是否有变化
* [url=home.php?mod=space&uid=952169]@Param[/url] oldObject 旧对象
* @param newObject 新对象
* [url=home.php?mod=space&uid=155549]@Return[/url] 结果
*/
private static List<ComparedResult> compareTwoObject(ComparedEntity oldObject, ComparedEntity newObject) {
List<ComparedResult> ret=new ArrayList<>();
Class clazz =oldObject.getClass();
try {
// 获取所有字段
Field[] Fields = clazz.getDeclaredFields();
for (Field field : Fields) {
String fieldName = field.getName();// 字段名
if (fieldName.equals("modifyUserId") || fieldName.equals("modifyUserName") || fieldName.equals("modifyTime")) {
continue;
}
ApiModelProperty fieldAnon =field.getAnnotation(ApiModelProperty.class);
String filedAnoName="";
if(null!= fieldAnon){
filedAnoName= fieldAnon.name(); // 字段中文名称
}
PropertyDescriptor pd=new PropertyDescriptor(field.getName(),clazz);
Method getMethod=pd.getReadMethod();
// 在oldObject上调用get方法等同于获得oldObject的属性值
Object oldValue = getMethod.invoke(oldObject);
// 在newObject上调用get方法等同于获得newObject的属性值
Object newValue = getMethod.invoke(newObject);
// 对比两个值是否一致
if(!oldValue.equals(newValue)){
ComparedResult result=new ComparedResult();
result.setFieldName(filedAnoName);
result.setCompare(oldValue + " -> " + newValue);
ret.add(result);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
/**
* 比较值是否相等
*
* @param newValue 新值
* @param oldValue 旧值
* @return 相等 返回true
*/
private static boolean compareTwo(Object newValue, Object oldValue) {
// 如果两字段都为空，也认为相等（用==判断，不得用equals）
if (oldValue == null || newValue == null) {
return true;
}
if (oldValue == null && newValue == "") {
return true;
}
// 比较内容
if (newValue.equals(oldValue)) {
return true;
}
return false;
}
}
运行结果：
[{"fieldName":"【姓名】","compare":"李师 -> 李师22"},{"fieldName":"【年龄】","compare":"18 -> 20"}]
比较对象实体类属性字段对比变化过程，可用于数据库更新数据时，比较数据，当数据发生变化时才更新数据库，或者记录已经变更的数据 等等.....
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发表于 2023-8-10 18:31
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发表于 2023-8-11 15:02
