mybatis使用拦截器显示sql,使用druid配置连接信息

1、显示出sql内容：

新建2个类：
MybatisInterceptor ；拦截sql，并获得输出sql内容

package com.cpp.core.filter;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
 
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.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
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 com.cpp.core.common.utils.SQLFormatter;
 
@Intercepts({
        @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }),
        @Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
                RowBounds.class, ResultHandler.class }) })
public class MybatisInterceptor implements Interceptor {
    private static Logger logger = LoggerFactory.getLogger(MybatisInterceptor.class);
    private Properties properties;
 
    public Object intercept(Invocation invocation) throws Throwable {
        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();
        Object returnValue = null;
        long start = System.currentTimeMillis();
        returnValue = invocation.proceed();
        long end = System.currentTimeMillis();
        long time = (end - start);
        if (time > 1) {
            String sql = getSql(configuration, boundSql, sqlId, time);
            logger.info("调用的java方法为：\n "+sql.split(":")[0]);
            logger.info("查询sql语句为：\n"+SQLFormatter.format(sql.split(":")[1])  +"\n"+"sql语句执行的时间："+time+"\n\n");
        }
        return returnValue;
    }
 
    public static String getSql(Configuration configuration, BoundSql boundSql, String sqlId, long time) {
        String sql = showSql(configuration, boundSql);
        StringBuilder str = new StringBuilder(100);
        str.append(sqlId);
        str.append(":");
        str.append(sql);
        str.append(":");
        str.append(time);
        str.append("ms");
        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(DateFormat.DEFAULT, DateFormat.DEFAULT, 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<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
        if (parameterMappings.size() > 0 && parameterObject != null) {
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\\?", 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("\\?", getParameterValue(obj));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?", getParameterValue(obj));
                    }
                }
            }
        }
        return sql;
    }
 
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }
 
    public void setProperties(Properties properties0) {
        this.properties = properties0;
    }
}

2、在新建sql格式化工具，格式化sql语句

package com.cpp.core.filter;
import java.util.Properties;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
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.plugin.Signature;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
@Intercepts({
    @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }),
    @Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
            RowBounds.class, ResultHandler.class }) })
public class SqlStatementInterceptor implements Interceptor{
    private Properties properties;
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        System.out.println("test");
        return invocation.proceed();
    }
    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }
    @Override
    public void setProperties(Properties properties0) {
        this.properties = properties0;
    }
}

3、在spring的配置文件中添加

 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
        <property name="typeAliasesPackage" value="com.cpp.core" />
        <!-- 显式指定Mapper文件位置 -->
        <property name="mapperLocations" value="classpath:/mybatis/*/*Mapper.xml" />
        <property name="plugins">
            <array>
                <ref bean="paginationInterceptor"/>
                <ref bean="sqlStatementInterceptor"/>
            </array>
        </property>
        <property name="configurationProperties">
            <props>
                <prop key="dialect">mysql</prop>
            </props>
        </property>
    </bean>

配置插件

 <ref bean="sqlStatementInterceptor"/>

配置注入的内容

 <bean id="sqlStatementInterceptor" class="com.cpp.core.filter.MybatisInterceptor"></bean>

2、如果使用的是Druid来连接的数据库

在web.xml文件中添加下面的信息

 <servlet>
      <servlet-name>DruidStatView</servlet-name>
      <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>DruidStatView</servlet-name>
      <url-pattern>/druid/*</url-pattern>
  </servlet-mapping>  

可以通过web的访问的形式进行访问页面：输入：
http://dev.eop.zhc360.com:8080/cpp-middleman-api/druid/sql.html
就可以查看到输出的sql语句了