mybatis自动填充时间字段示例代码

@Retention(RetentionPolicy.RUNTIME)
@Target( {ElementType.FIELD})
public @interface CreatedOnFuncation {

 String value() default "";
}
@Retention(RetentionPolicy.RUNTIME)
@Target( {ElementType.FIELD})
public @interface UpdatedOnFuncation {

 String value() default "";
}

@Getter
@Builder(toBuilder = true)
@ToString
public class UserInfo {
 private Long id;
 private String name;
 private String email;

 @CreatedOnFuncation
 private LocalDateTime createdOn;
 @UpdatedOnFuncation
 private LocalDateTime updatedOn;
}

package com.lind.basic.mybatis;

import com.baomidou.mybatisplus.extension.handlers.AbstractSqlParserHandler;
import java.lang.reflect.Field;
import java.time.LocalDateTime;
import java.util.Properties;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
import org.apache.ibatis.logging.Log;
import org.apache.ibatis.logging.LogFactory;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;

/**
 * 时间拦截器.
 */
@EqualsAndHashCode(callSuper = true)
@Data
@Accessors(chain = true)
@Intercepts( {
 @Signature(
 type = org.apache.ibatis.executor.Executor.class,
 method = "update",
 args = {MappedStatement.class, Object.class})})
public class CreateUpdateTimeInterceptor extends AbstractSqlParserHandler implements Interceptor {

 private static final Log logger = LogFactory.getLog(com.baomidou.mybatisplus.extension.plugins.SqlExplainInterceptor.class);

 private Properties properties;

 @Override
 public Object intercept(Invocation invocation) throws Throwable {
 MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];

 // 获取 SQL 命令
 SqlCommandType sqlCommandType = mappedStatement.getSqlCommandType();

 // 获取参数
 Object parameter = invocation.getArgs()[1];

 // 获取私有成员变量
 Field[] declaredFields = parameter.getClass().getDeclaredFields();

 for (Field field : declaredFields) {
 if (field.getAnnotation(CreatedOnFuncation.class) != null) {
 if (SqlCommandType.INSERT.equals(sqlCommandType)) { // insert 语句插入 createTime
  field.setAccessible(true);
  field.set(parameter, LocalDateTime.now());
 }
 }

 if (field.getAnnotation(UpdatedOnFuncation.class) != null) { // insert 或 update 语句插入 updateTime
 if (SqlCommandType.INSERT.equals(sqlCommandType) || SqlCommandType.UPDATE.equals(sqlCommandType)) {
  field.setAccessible(true);
  field.set(parameter, LocalDateTime.now());
 }
 }
 }

 return invocation.proceed();
 }

 @Override
 public Object plugin(Object target) {
 if (target instanceof org.apache.ibatis.executor.Executor) {
 return Plugin.wrap(target, this);
 }
 return target;
 }

 @Override
 public void setProperties(Properties prop) {
 this.properties = prop;
 }
}

 @Test
 public void insert() {
 UserInfo userInfo = UserInfo.builder()
 .name("lind")
 .email("test@sina.com")
 .build();
 userInfoMapper.insert(userInfo);
 System.out.println("userinfo:" + userInfo.toString());
 }

userinfo:UserInfo
(
id=1085780948955959297, 
name=lind, 
email=test@sina.com, 
createdOn=2019-01-17T14:08:45.665,
updatedOn=2019-01-17T14:08:45.665
)