公共字段填充，insertFill可以，updateFill一直不行，不知道为什么

```
   @TableField(fill = FieldFill.INSERT)
    private Date createDt;
    @TableField(fill = FieldFill.INSERT)
    private String createUsr;
    @TableField(fill = FieldFill.UPDATE)
    private Date updateDt;
    @TableField(fill = FieldFill.UPDATE)
    private String updateUsr;

package cn.com.joyplus.vfit.utils;

import com.baomidou.mybatisplus.enums.FieldStrategy;
import com.baomidou.mybatisplus.mapper.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.core.context.SecurityContextHolder;

import javax.xml.crypto.Data;
import java.util.Date;

/**
 * Created by on 2018/6/6.
 */
public class MyMetaObjectHandler extends MetaObjectHandler {

private static Logger logger = LoggerFactory.getLogger(MetaObjectHandler.class);

private static final String CREATE_DT = "createDt";
    private static final String CREATE_USR = "createUsr";
    private static final String UPDATE_DT = "updateDt";
    private static final String UPDATE_USR = "updateUsr";

@Override
    public void insertFill(MetaObject metaObject) {
        logger.info("新增的时候干点不可描述的事情");

if (metaObject.hasGetter(CREATE_DT) && metaObject.getValue(CREATE_DT) == null) {
            metaObject.setValue(CREATE_DT, new Date());
            logger.info("填充 createDt");
        }else {
            logger.info("不存在 createDt");
        }

if (metaObject.hasGetter(CREATE_USR) && metaObject.getValue(CREATE_USR) == null) {
            metaObject.setValue(CREATE_USR, SecurityContextHolder.getContext().getAuthentication().getName());
            logger.info("填充 createUsr");
         }else {
            logger.info("不存在 createUsr");
        }
     }

/**
     * 这个方法需要修改一下，总是不行
     * 使用metaObject.hasSetter 方法替代 metaObject.getValue方法
     * 【在更新中使用metaObject.getValue没有预期的效果，感觉怪怪的】
     * @param metaObject
     */
    @Override
    public void updateFill(MetaObject metaObject) {
        logger.info("更新的时候干点不可描述的事情");
        if (metaObject.hasSetter(UPDATE_DT)) {
            metaObject.setValue(UPDATE_DT, new Date());
            logger.info("填充 updateDt");
        }else {
            logger.info("不存在 updateDt");
        }

if (metaObject.hasSetter(UPDATE_USR)) {
            metaObject.setValue(UPDATE_USR, SecurityContextHolder.getContext().getAuthentication().getName());
            logger.info("填充 updateUsr");
        }else {
            logger.info("不存在 updateUsr");
        }
        for(String s : metaObject.getGetterNames())
        System.out.println("---->>>   "+s);

}
}
```

baomidou/mybatisplus-spring-boot

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