java 对象属性比较工具类

女爷i 2023-10-17 15:48 67阅读 0赞

package com.zxy.product.human.web.log;  
  
  
import java.lang.reflect.Field;  
import java.util.HashMap;  
import java.util.Map;  
  
  
import com.google.common.collect.Maps;  
/\*\*  
\* BeanUtil 对象属性比较工具类  
\* @author zzg  
\*  
\*\*/  
public class BeanUtil \{  
  
  
public static void main(String\[\] args) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException \{  
// TODO Auto-generated method stub  
BeanUtil util = new BeanUtil();  
//excel 读取数据  
Person excel = util.new Person();  
excel.setId("1");  
excel.setAge("18");  
excel.setName("知学云1");  
  
  
//database 读取数据  
Person database = util.new Person();  
database.setId("1");  
database.setAge("16");  
database.setName("知学云");  
  
  
  
  
  
  
  
  
  
  
Map<String,Map<String,Object>> map = util.getMap(excel);  
//遍历map  
// for (Map.Entry<String,Object> entry : map.entrySet()) \{  
// System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());  
// \}  
boolean flag = util.getFieldEqual(database, map);  
System.out.println("属性值是否发生改变:"+ flag);  
  
  
Map<String,Map<String,Object>> fields = util.getFieldUpdate(database, map);  
Map<String,Object> c = fields.get(database.getId());  
for (Map.Entry<String,Object> entry : c.entrySet()) \{  
System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());  
\}  
  
  
\}  
// 指定Bean对象 关联属性转换为Map  
public Map<String,Map<String,Object>> getMap(Person object) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException\{  
Map<String,Map<String,Object>> obj = new HashMap<String,Map<String,Object>>();  
  
  
Map<String,Object> map = Maps.newHashMap();  
Class<?> cls = object.getClass();  
Field\[\] fields = cls.getDeclaredFields();  
for(Field field : fields)\{  
Object value = getFieldValue(object, field.getName());  
String key = field.getName();  
map.put(key, value);  
\}  
  
  
obj.put(object.getId(), map);  
return obj;  
\}  
// Bean 关联属性转换为Map  
public Map<String,Object> getMapProperties(Person object) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException\{  
Map<String,Object> map = Maps.newHashMap();  
Class<?> cls = object.getClass();  
Field\[\] fields = cls.getDeclaredFields();  
for(Field field : fields)\{  
Object value = getFieldValue(object, field.getName());  
String key = field.getName();  
map.put(key, value);  
\}  
return map;  
\}  
// 获取指定Field 属性值  
public Object getFieldValue(Object obj, String fieldName) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException\{  
Class<?> cls = obj.getClass();  
Object value = null;  
Field field = cls.getDeclaredField(fieldName);;  
field.setAccessible(true);  
value = field.get(obj);  
return value;  
\}  
  
  
//判断指定对象的属性值是否相等  
public boolean getFieldEqual(Person object, Map<String,Map<String, Object>> map) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException\{  
boolean flag = false;  
Class<?> cls = object.getClass();  
Field\[\] fields = cls.getDeclaredFields();  
if(map.containsKey(object.getId()))\{  
Map<String, Object> content = map.get(object.getId());  
for(Field field : fields)\{  
Object excel = content.get(field.getName());  
Object database = getFieldValue(object,field.getName());  
if(excel == null && database == null)\{  
flag = false;  
\}else if(excel != null && database == null)\{  
flag = true;  
break;  
\}else if(excel == null && database != null)\{  
flag = true;  
break;  
\}else if(excel != null && database != null)\{  
if(excel.equals(database))\{  
flag = false;  
\}else\{  
flag = true;  
break;  
\}  
\}  
  
  
\}  
\}  
return flag;  
\}  
  
  
// 返回匹配对象修改的属性值  
public Map<String,Map<String,Object>> getFieldUpdate(Person object, Map<String,Map<String, Object>> map) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException\{  
  
  
Map<String,Map<String,Object>> result =new HashMap<String,Map<String,Object>>();  
Class<?> cls = object.getClass();  
Field\[\] fields = cls.getDeclaredFields();  
Map<String, Object> content = map.get(object.getId());  
if(map.containsKey(object.getId()))\{  
Map<String,Object> f = new HashMap<String,Object>();  
for(Field field : fields)\{  
Object excel = content.get(field.getName());  
Object database = getFieldValue(object,field.getName());  
//属性值判断：四种情况  
if(excel != null && database!= null)\{  
if(!excel.equals(database))\{  
f.put(field.getName(), excel);  
\}  
\}else if(excel == null && database == null)\{  
\}else if(excel != null && database == null)\{  
f.put(field.getName(), excel);  
\}else if(excel == null && database != null)\{  
f.put(field.getName(), null);  
\}  
  
  
\}  
result.put(object.getId(), f);  
\}  
  
  
return result;  
\}  
  
  
public class Person\{  
private String id;  
private String name;  
private String age;  
private String sex;  
  
  
public String getId() \{  
return id;  
\}  
  
  
public void setId(String id) \{  
this.id = id;  
\}  
  
  
  
  
public String getName() \{  
return name;  
\}  
  
  
public void setName(String name) \{  
this.name = name;  
\}  
  
  
public String getAge() \{  
return age;  
\}  
  
  
public void setAge(String age) \{  
this.age = age;  
\}  
  
  
public String getSex() \{  
return sex;  
\}  
  
  
public void setSex(String sex) \{  
this.sex = sex;  
\}  
  
  
  
  
\}  
  
  
\}