Java比较两个对象中全部属性值是否相等的方法

例如下述Java类:

import java.io.Serializable; import java.util.List; public class Bean_Topology implements Serializable { private static final long serialVersionUID = 1L; public static long getSerialversionuid() {return serialVersionUID; } private Long topology_pk; private String topology_id; public String getTopology_id() {return topology_id; } public void setTopology_id(String topology_id) {this.topology_id = topology_id; } public Long getTopology_pk() {return topology_pk; } public void setTopology_pk(Long topology_pk) {this.topology_pk = topology_pk; } @Override public String toString() {return "当前拓扑的PK为:" + topology_pk + ",ID为:" + topology_id; }}

如下想判断下面两个对象中全部属性值是否一致时,有哪些办法呢?
Bean_Topology topology1 = new Bean_Topology(); topology1.setTopology_id("1"); Bean_Topology topology2 = new Bean_Topology(); topology2.setTopology_pk(1L); topology2.setTopology_id("1");

方法一:重写Bean_Topology的equals方法和hashcode方法,代码如下:

@Overridepublic boolean equals(Object obj) {if (this == obj) {return true; }if (obj == null || getClass() != obj.getClass()) {return false; }Bean_Topology topology = (Bean_Topology) obj; if (topology_pk == null) {if (topology.topology_pk != null) {return false; } }else if (!topology_pk.equals(topology.topology_pk)) {return false; }if (topology_id == null) {if (topology.topology_id != null) {return false; } }else if (!topology_id.equals(topology.topology_id)) {return false; }return true; } @Overridepublic int hashCode() {returntopology_pk.hashCode()+topology_id.hashCode(); }

测试代码如下:
if(topology1.equals(topology2)) { System.out.println("对象1与对象2的属性值无差异。"); }else { System.out.println("对象1与对象2的属性值有差异。"); }

输出结果为:
对象1与对象2的属性值有差异。

方法二:调用文章末尾的工具类,代码如下:

Map> resultMap=compareFields(topology1,topology2); int size=resultMap.size(); if(size>0) {System.out.println("对象1与对象2的属性值有差异,差异结果如下:"); Iterator it = resultMap.keySet().iterator(); while(it.hasNext()) {String key=it.next(); System.out.println(""+key+"(oldValue:"+resultMap.get(key).get("oldValue")+",newValue:"+resultMap.get(key).get("newValue")+")"); } }else { System.out.println("对象1与对象2的属性值无差异!"); }

输出结果为:
对象1与对象2的属性值有差异,差异结果如下:
topology_pk(oldValue:null,newValue:1)

【Java比较两个对象中全部属性值是否相等的方法】工具类如下:

package com.sitech.modual.util.compare; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.lang.reflect.Method; import java.sql.Timestamp; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import com.sitech.modual.bean.Bean_Link; import com.sitech.modual.bean.Bean_Topology; public class ClassCompareUtil { /*** 比较两个实体属性值,返回一个boolean,true则表时两个对象中的属性值无差异* @param oldObject 进行属性比较的对象1* @param newObject 进行属性比较的对象2* @return 属性差异比较结果boolean*/ public static boolean compareObject(Object oldObject, Object newObject) {Map> resultMap=compareFields(oldObject,newObject); if(resultMap.size()>0) {return false; }else {return true; } } /*** 比较两个实体属性值,返回一个map以有差异的属性名为key,value为一个Map分别存oldObject,newObject此属性名的值* @param oldObject 进行属性比较的对象1* @param newObject 进行属性比较的对象2* @return 属性差异比较结果map*/ @SuppressWarnings("rawtypes") public static Map> compareFields(Object oldObject, Object newObject) {Map> map = null; try{ /*** 只有两个对象都是同一类型的才有可比性*/if (oldObject.getClass() == newObject.getClass()) {map = new HashMap>(); Class clazz = oldObject.getClass(); //获取object的所有属性PropertyDescriptor[] pds = Introspector.getBeanInfo(clazz,Object.class).getPropertyDescriptors(); for (PropertyDescriptor pd : pds) {//遍历获取属性名String name = pd.getName(); //获取属性的get方法Method readMethod = pd.getReadMethod(); // 在oldObject上调用get方法等同于获得oldObject的属性值Object oldValue = https://www.it610.com/article/readMethod.invoke(oldObject); // 在newObject上调用get方法等同于获得newObject的属性值Object newValue = readMethod.invoke(newObject); if(oldValue instanceof List){continue; }if(newValue instanceof List){continue; }if(oldValue instanceof Timestamp){oldValue = new Date(((Timestamp) oldValue).getTime()); }if(newValue instanceof Timestamp){newValue = new Date(((Timestamp) newValue).getTime()); }if(oldValue == null && newValue == null){continue; }else if(oldValue == null && newValue != null){Map valueMap = new HashMap(); valueMap.put("oldValue",oldValue); valueMap.put("newValue",newValue); map.put(name, valueMap); continue; }if (!oldValue.equals(newValue)) {// 比较这两个值是否相等,不等就可以放入map了Map valueMap = new HashMap(); valueMap.put("oldValue",oldValue); valueMap.put("newValue",newValue); map.put(name, valueMap); }}}}catch(Exception e){e.printStackTrace(); }return map; }}

注意:本工具类不适用于比较包含List,Map等类的Class。

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