注：可以拦截sql 执行时间，优化sql。并打印sql 以及参数

第一步：创建类：

SqlPrintInterceptor 并实现 Interceptor

该类如下：

package com.ra.common.plugin;import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.mapping.ParameterMode;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.regex.Matcher;
/**  MyBatis 将mybatis要执行的sql拦截打印出来*/
@Intercepts({@Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}),@Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})})
public class SqlPrintInterceptor implements Interceptor{private static final Logger log = LoggerFactory.getLogger(SqlPrintInterceptor.class);private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");@Overridepublic Object intercept(Invocation invocation) throws Throwable {MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];Object parameterObject = null;if (invocation.getArgs().length > 1) {parameterObject = invocation.getArgs()[1];}long start = System.currentTimeMillis();Object result = invocation.proceed();String statementId = mappedStatement.getId();BoundSql boundSql = mappedStatement.getBoundSql(parameterObject);Configuration configuration = mappedStatement.getConfiguration();String sql = getSql(boundSql, parameterObject, configuration);long end = System.currentTimeMillis();long timing = end - start;//根据个人喜好看需要打印怎么sql,本人是打印打印  1s的if(log.isInfoEnabled() && timing>1000){log.info("执行sql耗时:" + timing + " ms" + " - id:" + statementId + " - Sql:" );log.info("   "+sql);}return result;}@Overridepublic Object plugin(Object target) {if (target instanceof Executor) {return Plugin.wrap(target, this);}return target;}@Overridepublic void setProperties(Properties properties) {}private String getSql(BoundSql boundSql, Object parameterObject, Configuration configuration) {String sql = boundSql.getSql().replaceAll("[\\s]+", " ");List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();if (parameterMappings != null) {for (int i = 0; i < parameterMappings.size(); i++) {ParameterMapping parameterMapping = parameterMappings.get(i);if (parameterMapping.getMode() != ParameterMode.OUT) {Object value;String propertyName = parameterMapping.getProperty();if (boundSql.hasAdditionalParameter(propertyName)) {value = boundSql.getAdditionalParameter(propertyName);} else if (parameterObject == null) {value = null;} else if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {value = parameterObject;} else {MetaObject metaObject = configuration.newMetaObject(parameterObject);value = metaObject.getValue(propertyName);}sql = replacePlaceholder(sql, value);}}}return sql;}private String replacePlaceholder(String sql, Object propertyValue) {String result;if (propertyValue != null) {if (propertyValue instanceof String) {result = "'" + propertyValue + "'";} else if (propertyValue instanceof Date) {result = "'" + DATE_FORMAT.format(propertyValue) + "'";} else {result = propertyValue.toString();}} else {result = "null";}return sql.replaceFirst("\\?", Matcher.quoteReplacement(result));}
}

第二步：在mybatis-config.xml 文件加上

<plugins><!--监控 sql 埋点 分页--><plugin interceptor="com.ra.common.plugin.SqlPrintInterceptor"></plugin>
</plugins>