使用mybatis插件拦截SQL

1、定义注解，只拦截有注解的Mapper方法

package com.sgm.qms.system.aop;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 导入记录日志
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ExportLogger {
}

2、定义拦截器

package com.sgm.qms.system.aop;

import com.sgm.qms.common.controller.BaseController;
import com.sgm.qms.common.utils.ContextUtil;
import com.sgm.qms.system.entity.Employee;
import org.apache.ibatis.cache.CacheKey;
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.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 org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.text.DateFormat;
import java.util.*;
import java.util.regex.Matcher;


@Intercepts({
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}),
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})
})
@Component
public class ExportLoggerInterceptor extends BaseController implements Interceptor {

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

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

            //1.获取方法全路径
            String methodNameSpace = mappedStatement.getId();
            int i = methodNameSpace.lastIndexOf(".");
            String className = methodNameSpace.substring(0, i);
            String methodName = methodNameSpace.substring(++i);
            Class<?> mapperClass = Class.forName(className);
            Method[] declaredMethods = mapperClass.getDeclaredMethods();
            for (Method method : declaredMethods) {
                if(methodName.equals(method.getName())) {
                    ExportLogger exportLogger = method.getAnnotation(ExportLogger.class);
                    if(exportLogger != null) {
                        Object parameter = null;
                        if (invocation.getArgs().length > 1) {
                            parameter = invocation.getArgs()[1];
                        }
                        BoundSql boundSql = mappedStatement.getBoundSql(parameter);
                        Configuration configuration = mappedStatement.getConfiguration();
                        String sql = getSql(configuration, boundSql);// todo 此处将信息存入数据即可
                    }
                }
            }
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }
        return invocation.proceed();
    }


    @Override
    public Object plugin(Object target) {
        return target instanceof Executor ? Plugin.wrap(target, this) : target;
    }

    @Override
    public void setProperties(Properties properties) {}


    private static String getSql(Configuration configuration, BoundSql boundSql) {
        String sql = showSql(configuration, boundSql);
        return sql;
    }

    private static String getParameterValue(Object obj) {
        String value = null;
        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;
    }

    private static String showSql(Configuration configuration, BoundSql boundSql) {
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        String sql = boundSql.getSql().replaceAll("[\s]+", " ");
        if (!parameterMappings.isEmpty() && parameterObject != null) {
            TypeHandlerRegistry typeHandlerRegistry = configuration
                    .getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\?",
                        Matcher.quoteReplacement(getParameterValue(parameterObject)));

            } else {
                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)) {
                        Object obj = boundSql
                                .getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    } else {
                        sql = sql.replaceFirst("\?", "缺失");
                    }//打印出缺失，提醒该参数缺失并防止错位
                }
            }
        }
        return sql;
    }
}

3、向容器添加插件

　　　a springboot项目直接在拦截器类上加 @Component 注解 或 使用 @Bean 注入容器

　　　b 非springboot项目在mybatis的配置文件加入 plugin 就行