个人记录：日志生成，不同字段的比较_JAVA_编程开发_程序员俱乐部

class="java" name="code">
public String DifferentOfTwoVO(String empName,GbsExtendedVO oldVO,GbsExtendedVO newVO){
		String str=empName;
		String nullStr= empName;
		if(oldVO==null){
			str=str+"添加数据：";
			nullStr=nullStr+"添加数据：";
			try {
	            Class clazz = newVO.getClass();
	            Field[] fields = newVO.getClass().getDeclaredFields();
	            int i=1;
	            for (Field field : fields) {
	            	if("serialVersionUID".equals(field.getName())||
	            			"creator".equals(field.getName())||
	            			"creatorName".equals(field.getName())||
	            			"createTime".equals(field.getName())){
	                     continue;
	                }
	            	
	                PropertyDescriptor pd = new PropertyDescriptor(field.getName(), clazz);
	                Method getMethod = pd.getReadMethod();
	                Object o2 = getMethod.invoke(newVO);
	                if(o2 == null){
	                    continue;
	                }else{
	                	if(i!=1){
	                		str+=";";
	                    }
	                    str+=i+";字段名称"+field.getName()+"的新值:"+o2;
	                    i++;
	                }
	            }
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
		}else{
			str=str+"修改数据：";
			nullStr=nullStr+"修改数据：";
			try {
	            Class clazz = newVO.getClass();
	            Field[] fields = newVO.getClass().getDeclaredFields();
	            int i=1;
	            for (Field field : fields) {
	            	if("serialVersionUID".equals(field.getName())||
	            			"creator".equals(field.getName())||
	            			"creatorName".equals(field.getName())||
	            			"createTime".equals(field.getName())){
	                     continue;
	                }
	            
	                PropertyDescriptor pd = new PropertyDescriptor(field.getName(), clazz);
	                Method getMethod = pd.getReadMethod();
	                Object o1 = getMethod.invoke(oldVO);
	                Object o2 = getMethod.invoke(newVO);
	                if(o1==null && o2 == null){
	                    continue;
	                }else if (o1!=null && o2 != null){
	                	if (!o1.toString().equals(o2.toString())) {
		                    if(i!=1){
		                        str+=";";
		                    }
		                    str+=i+";字段名称"+field.getName()+",旧值:"+o1+",新值:"+o2;
		                    i++;
		                } 
	                }else if(o1==null && o2 != null){
	                	 if(i!=1){
		                        str+=";";
		                    }
		                    str+=i+";字段名称"+field.getName()+",旧值:空"+",新值:"+o2;
		                    i++;
	                }else if(o1!=null && o2 == null){
	                	 if(i!=1){
		                        str+=";";
		                    }
		                    str+=i+";字段名称"+field.getName()+",旧值:"+o1+",新值:空";
		                    i++;
	                }
	                
	            }
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
		}
		if(nullStr.equals(str)){
			return null;
		}
        return str;
	}