我们在执行语句的时候会使用Mybatis自带的日志打印工具，但是打印的时候参数会用?代替，显得看起来不是那么直观，所以通过实现了InnerInterceptor接口，并重写了beforeQuery和beforeUpdate方法。在这两个方法中，它会获取到执行的SQL语句、参数等信息，并通过日志输出。

@Configuration
public class MybatisConfiguration {public MybatisPlusInterceptor mybatisPlusInterceptor(){MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();mybatisPlusInterceptor.addInnerInterceptor(new MybatisPlusAllSqlLog());return mybatisPlusInterceptor;}
}

public class MybatisPlusAllSqlLog implements InnerInterceptor {public static final Logger log = LoggerFactory.getLogger("sys-sql");@Overridepublic void beforeQuery(Executor executor, MappedStatement ms, Object parameter, RowBounds rowBounds, ResultHandler resultHandler, BoundSql boundSql) throws SQLException {logInfo(boundSql, ms, parameter);}@Overridepublic void beforeUpdate(Executor executor, MappedStatement ms, Object parameter) throws SQLException {BoundSql boundSql = ms.getBoundSql(parameter);logInfo(boundSql, ms, parameter);}private static void logInfo(BoundSql boundSql, MappedStatement ms, Object parameter) {try {log.info("parameter = " + parameter);// 获取到节点的id,即sql语句的idString sqlId = ms.getId();log.info("sqlId = " + sqlId);// 获取节点的配置Configuration configuration = ms.getConfiguration();// 获取到最终的sql语句String sql = getSql(configuration, boundSql, sqlId);log.info("完整的sql:{}", sql);} catch (Exception e) {log.error("异常:{}", e.getLocalizedMessage(), e);}}// 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId) {return sqlId + ":" + showSql(configuration, boundSql);}// 进行？的替换public static String showSql(Configuration configuration, BoundSql boundSql) {// 获取参数Object parameterObject = boundSql.getParameterObject();List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();// sql语句中多个空格都用一个空格代替String sql = boundSql.getSql().replaceAll("[\\s]+", " ");if (!CollectionUtils.isEmpty(parameterMappings) && parameterObject != null) {// 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();// 如果根据parameterObject.getClass(）可以找到对应的类型，则替换if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {sql = sql.replaceFirst("\\?",Matcher.quoteReplacement(getParameterValue(parameterObject)));} else {// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作MetaObject metaObject = configuration.newMetaObject(parameterObject);for (ParameterMapping parameterMapping : parameterMappings) {String propertyName = parameterMapping.getProperty();if (metaObject.hasGetter(propertyName)) {Object obj = metaObject.getValue(propertyName);sql = sql.replaceFirst("\\?",Matcher.quoteReplacement(getParameterValue(obj)));} else if (boundSql.hasAdditionalParameter(propertyName)) {// 该分支是动态sqlObject obj = boundSql.getAdditionalParameter(propertyName);sql = sql.replaceFirst("\\?",Matcher.quoteReplacement(getParameterValue(obj)));} else {// 打印出缺失，提醒该参数缺失并防止错位sql = sql.replaceFirst("\\?", "缺失");}}}}return sql;}// 如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理private static String getParameterValue(Object obj) {String value;if (obj instanceof String) {value = "'" + obj.toString() + "'";} else if (obj instanceof Date) {DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT,DateFormat.DEFAULT, Locale.CHINA);value = "'" + formatter.format(new Date()) + "'";} else {if (obj != null) {value = obj.toString();} else {value = "";}}return value;}}