例如下述Java類：

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 '當(dāng)前拓?fù)涞腜K為：' + topology_pk + '，ID為：' + topology_id; }}

如下想判斷下面兩個(gè)對(duì)象中全部屬性值是否一致時(shí)，有哪些辦法呢？

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：重寫(xiě)B(tài)ean_Topology的equals方法和hashcode方法，代碼如下：

@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; } @Override public int hashCode() {return topology_pk.hashCode()+topology_id.hashCode(); }

測(cè)試代碼如下：

if(topology1.equals(topology2)) { System.out.println('對(duì)象1與對(duì)象2的屬性值無(wú)差異。');}else { System.out.println('對(duì)象1與對(duì)象2的屬性值有差異。'); }

輸出結(jié)果為：

對(duì)象1與對(duì)象2的屬性值有差異。

Map<String, Map<String,Object>> resultMap=compareFields(topology1,topology2);int size=resultMap.size();if(size>0) { System.out.println('對(duì)象1與對(duì)象2的屬性值有差異,差異結(jié)果如下：'); Iterator<String> 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('對(duì)象1與對(duì)象2的屬性值無(wú)差異！');}

輸出結(jié)果為：

對(duì)象1與對(duì)象2的屬性值有差異,差異結(jié)果如下： topology_pk(oldValue:null,newValue:1)

工具類如下：

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 { /** * 比較兩個(gè)實(shí)體屬性值，返回一個(gè)boolean,true則表時(shí)兩個(gè)對(duì)象中的屬性值無(wú)差異 * @param oldObject 進(jìn)行屬性比較的對(duì)象1 * @param newObject 進(jìn)行屬性比較的對(duì)象2 * @return 屬性差異比較結(jié)果boolean */ public static boolean compareObject(Object oldObject, Object newObject) { Map<String, Map<String,Object>> resultMap=compareFields(oldObject,newObject); if(resultMap.size()>0) { return false; }else { return true; } } /** * 比較兩個(gè)實(shí)體屬性值，返回一個(gè)map以有差異的屬性名為key，value為一個(gè)Map分別存oldObject,newObject此屬性名的值 * @param oldObject 進(jìn)行屬性比較的對(duì)象1 * @param newObject 進(jìn)行屬性比較的對(duì)象2 * @return 屬性差異比較結(jié)果map */ @SuppressWarnings('rawtypes') public static Map<String, Map<String,Object>> compareFields(Object oldObject, Object newObject) { Map<String, Map<String, Object>> map = null; try{ /** * 只有兩個(gè)對(duì)象都是同一類型的才有可比性 */ if (oldObject.getClass() == newObject.getClass()) { map = new HashMap<String, Map<String,Object>>();Class clazz = oldObject.getClass(); //獲取object的所有屬性 PropertyDescriptor[] pds = Introspector.getBeanInfo(clazz,Object.class).getPropertyDescriptors();for (PropertyDescriptor pd : pds) { //遍歷獲取屬性名 String name = pd.getName(); //獲取屬性的get方法 Method readMethod = pd.getReadMethod(); // 在oldObject上調(diào)用get方法等同于獲得oldObject的屬性值 Object oldValue = readMethod.invoke(oldObject); // 在newObject上調(diào)用get方法等同于獲得newObject的屬性值 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<String,Object> valueMap = new HashMap<String,Object>(); valueMap.put('oldValue',oldValue); valueMap.put('newValue',newValue); map.put(name, valueMap); continue; } if (!oldValue.equals(newValue)) {// 比較這兩個(gè)值是否相等,不等就可以放入map了 Map<String,Object> valueMap = new HashMap<String,Object>(); valueMap.put('oldValue',oldValue); valueMap.put('newValue',newValue); map.put(name, valueMap); } } } }catch(Exception e){ e.printStackTrace(); } return map; }}

注意：本工具類不適用于比較包含List，Map等類的Class。

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