Java比較兩個bean數據差別

時間 2019-11-17

標籤 java 比較兩個 bean 數據差別欄目 Java 简体版

原文原文鏈接

/**
* @Title: CompareObjUtil.java
* @Package cc.messcat.common.util
* @Description: TODO
* @author limh
* @date 2017年3月2日
*/
package cc.messcat.util;java

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;this

import cc.messcat.vo.Comparison;spa

/**
* ClassName: 對象比較類
* @Description: TODO
* @author limh
* @date 2017年3月2日
*/
public class CompareObjUtil {.net

   public static List<Comparison> compareObj(Object beforeObj,Object afterObj) throws Exception{
       List<Comparison> differents = new ArrayList<Comparison>();

       if(beforeObj == null) throw new Exception("原對象不能爲空");
       if(afterObj == null) throw new Exception("新對象不能爲空");
       if(!beforeObj.getClass().isAssignableFrom(afterObj.getClass())){
           throw new Exception("兩個對象不相同，沒法比較");
       }

       //取出屬性
       Field[] beforeFields = beforeObj.getClass().getDeclaredFields();
       Field[] afterFields = afterObj.getClass().getDeclaredFields();
       Field.setAccessible(beforeFields, true);
       Field.setAccessible(afterFields, true);

       //遍歷取出差別值
       if(beforeFields != null && beforeFields.length > 0){
           for(int i=0; i<beforeFields.length; i++){
               Object beforeValue = beforeFields[i].get(beforeObj);
               Object afterValue = afterFields[i].get(afterObj);
                   if((beforeValue != null && !"".equals(beforeValue) && !beforeValue.equals(afterValue)) || ((beforeValue == null || "".equals(beforeValue)) && afterValue != null)){
                       Comparison comparison = new Comparison();
                       comparison.setField(beforeFields[i].getName());
                       comparison.setBefore(beforeValue);
                       comparison.setAfter(afterValue);
                       differents.add(comparison);
                   }
           }
       }

       return differents;
   }
}
對象

/**
* @Title: Comparison.java
* @Package cc.messcat.vo
* @Description: TODO
* @author limh
* @date 2017年3月2日
*/
package cc.messcat.vo;ip

/**
* ClassName: 對照實體
* @Description: TODO
* @author limh
* @date 2017年3月2日
*/
public class Comparison {

   //字段
   private String Field;
   //字段舊值
   private Object before;
   //字段新值
   private Object after;

   /**
   * @return the field
   */
   public String getField() {
       return Field;
   }
   /**
   * @param field the field to set
   */
   public void setField(String field) {
       Field = field;
   }
   /**
   * @return the before
   */
   public Object getBefore() {
       return before;
   }
   /**
   * @param before the before to set
   */
   public void setBefore(Object before) {
       this.before = before;
   }
   /**
   * @return the after
   */
   public Object getAfter() {
       return after;
   }
   /**
   * @param after the after to set
   */
   public void setAfter(Object after) {
       this.after = after;
   }

}
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