通过第三方日志工具可以控制日志级别的输出，但是我们发现mybatis输出的SQL不是那么的完整，我们SQL里的参数值并没有打印出来，下面我就来讲讲怎么样对mybatis的输出sql格式化。

首先我这个案例是基于Spring boot 来开发的，所以配置和传统的xml配置有所区别，spring boot大大简化了一些配置，它把配置放到java代码，我们只需要使用注解就可替代一些以前xml的配置。

自定义拦截器

import java.io.PrintStream;import java.text.DateFormat;import java.util.Date;import java.util.List;import java.util.Locale;import java.util.Properties;import java.util.regex.Matcher;import org.apache.commons.collections.CollectionUtils;import org.apache.ibatis.mapping.BoundSql;import org.apache.ibatis.mapping.MappedStatement;import org.apache.ibatis.mapping.ParameterMapping;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.reflection.MetaObject;import org.apache.ibatis.session.Configuration;import org.apache.ibatis.type.TypeHandlerRegistry;import org.springframework.stereotype.Component;/** * 自定义mybatis拦截器,格式化SQL输出, * * @author zengsong * @version 1.0 * @description 只对查询和更新语句做了格式化，其它语句需要手动添加 * @date 2019/5/30 10:17 **/@Intercepts({@org.apache.ibatis.plugin.Signature(type=org.apache.ibatis.executor.Executor.class, method="update", args={MappedStatement.class, Object.class}), @org.apache.ibatis.plugin.Signature(type=org.apache.ibatis.executor.Executor.class, method="query", args={MappedStatement.class, Object.class, org.apache.ibatis.session.RowBounds.class, org.apache.ibatis.session.ResultHandler.class})})@Componentpublic class MybatisResultInterceptor        implements Interceptor{    public Object intercept(Invocation invocation)            throws Throwable    {        try        {            MappedStatement mappedStatement = (MappedStatement)invocation.getArgs()[0];            Object parameter = null;            if (invocation.getArgs().length > 1) {                parameter = invocation.getArgs()[1];            }            String sqlId = mappedStatement.getId();            BoundSql boundSql = mappedStatement.getBoundSql(parameter);            Configuration configuration = mappedStatement.getConfiguration();            String sql = getSql(configuration, boundSql, sqlId);            System.out.println(sql);        }        catch (Exception localException) {}        return invocation.proceed();    }    public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId)    {        String sql = showSql(configuration, boundSql);        StringBuilder str = new StringBuilder(100);        str.append(sqlId);        str.append(":");        str.append(sql);        return str.toString();    }    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(2, 2, Locale.CHINA);            value = "'" + formatter.format(new Date()) + "'";        }        else if (obj != null)        {            value = obj.toString();        }        else        {            value = "";        }        return value;    }    public static String showSql(Configuration configuration, BoundSql boundSql)    {        Object parameterObject = boundSql.getParameterObject();        List
     
       parameterMappings = boundSql.getParameterMappings();        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");        MetaObject metaObject;        if ((CollectionUtils.isNotEmpty(parameterMappings)) && (parameterObject != null))        {            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass()))            {                sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));            }            else            {                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");                    }                }            }        }        return sql;    }    public Object plugin(Object target)    {        return Plugin.wrap(target, this);    }    public void setProperties(Properties properties) {}}
     

配置拦截器

import com.sengled.cloud.data.platform.dao.mybatis.MybatisResultInterceptor;import java.util.Properties;import javax.annotation.Resource;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;/** * 自定义mybatis拦截器 * * @author zengsong * @version 1.0 * @description * @date 2019/5/30 10:17 **/@Configurationpublic class MybatisInterceptorConfig{    @Resource    private MybatisResultInterceptor mybatisResultInterceptor;    @Bean    public String myInterceptor()    {        Properties properties = new Properties();        this.mybatisResultInterceptor.setProperties(properties);        return "interceptor";    }}

配置日志级别