mybatis拦截器的使用方式(输出日志或sql语句)

Object intercept(Invocation invocation) throws Throwable;
Object plugin(Object target);
void setProperties(Properties properties);

@Intercepts({@Signature(method = "update", type = Executor.class, args = {MappedStatement.class, Object.class})})
public class LogInterceptor implements Interceptor {
    /**
     * 注解拦截接口的方法
     * Executor (update, query, flushStatements, commit, rollback, getTransaction, close, isClosed)
     * ParameterHandler (getParameterObject, setParameters)
     * ResultSetHandler (handleResultSets, handleOutputParameters)
     * StatementHandler (prepare, parameterize, batch, update, query)
     */

    private static final Logger LOGGER = LoggerFactory.getLogger(LogInterceptor.class);

    private Properties properties;

    public Object intercept(Invocation invocation) throws Throwable {
        Object[] args = invocation.getArgs();
        // 获取执行的方法
        if (args.length > 1) {
            // 传入的对象
            Object obj = args[1];
            if (obj instanceof Log) {
                // 若是日志对象 则直接跳过
                return invocation.proceed();
            }
            saveLog(args[0], obj);
        }
        return invocation.proceed();
    }

    private void saveLog(Object arg, Object obj) {
        Log log = new Log();
        log.setCreateTime(DateUtils.now());
        log.setModifyTime(DateUtils.now());
        MappedStatement mappedStatement = (MappedStatement) arg;
        // 执行的方法名
        String name = mappedStatement.getSqlCommandType().name();
        String change = JsonMapper.toJson(obj);
        if (name.startsWith("INSERT")) {
            log.setType("新增" + obj.getClass().getSimpleName());
            log.setNewContent(change);
        } else if (name.startsWith("UPDATE")) {
            log.setType("修改" + obj.getClass().getSimpleName());
            log.setNewContent(change);
        } else if (name.startsWith("DELETE")) {
            log.setType("删除" + obj.getClass().getSimpleName());
            log.setOldContent(change);
        }

        LOGGER.info("----------------------------------------------");
        LOGGER.info(JsonMapper.toJson(log));
        LOGGER.info("----------------------------------------------");
    }

    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

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

}

@Intercepts({@Signature(method = "update", type = Executor.class, args = {MappedStatement.class, Object.class})})

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
  <settings>
      <setting name="cacheEnabled" value="true"/>
      <setting name="lazyLoadingEnabled" value="true"/>
      <setting name="multipleResultSetsEnabled" value="true"/>
      <setting name="useColumnLabel" value="true"/>
      <setting name="useGeneratedKeys" value="false"/>
    </settings>
    
    <plugins>
        <plugin interceptor="com.tc.itfarm.commons.interceptor.LogInterceptor"></plugin>
    </plugins>
</configuration>