一、项目环境
项目环境:
apache-tomcat-8.5.37
apache-maven-3.6.0
MySQL 5.6.30
jdk8
二、创建Maven项目(完整项目结构)
三、配置文件及数据库文件
1、pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com</groupId>
<artifactId>myapp</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>myapp Maven Webapp</name>
<url>http://maven.apache.org</url>
<!--定义版本号 -->
<properties>
<project.lombok.version>1.18.16</project.lombok.version>
<project.spring.version>5.2.12.RELEASE</project.spring.version>
<project.junit.version>4.12</project.junit.version>
<project.mysql.version>8.0.22</project.mysql.version>
<project.druid.version>1.2.4</project.druid.version>
<project.mybatis.version>3.5.6</project.mybatis.version>
<project.mybatis-spring.version>2.0.6</project.mybatis-spring.version>
<project.jackson.version>2.12.1</project.jackson.version>
</properties>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${project.lombok.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${project.spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${project.spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${project.spring.version}</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${project.junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${project.mysql.version}</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${project.druid.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${project.mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${project.mybatis-spring.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.14.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.14.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>2.14.1</version>
</dependency>
<!--异步日志依赖 -->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>3.4.2</version>
</dependency>
<!-- <dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.30</version>
</dependency> -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.14.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${project.jackson.version}</version>
</dependency>
</dependencies>
<build>
<finalName>myapp</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
<compilerArguments>
<extdirs>src\main\webapp\WEB-INF\lib</extdirs>
</compilerArguments>
</configuration>
</plugin>
</plugins>
</build>
</project>
2、db.properties 数据库信息
druid.driver=com.mysql.jdbc.Driver
druid.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false
druid.username=root
druid.password=root
3、log4j2.xml 日志信息
<?xml version="1.0" encoding="UTF-8" ?>
<!-- status="off" 日志框架本身的输出日志级别,可以修改为debug monitorInterval="5" 自动加载配置文件的间隔时间,不低于
5秒;生产环境中修改配置文件,是热更新,无需重启应用 -->
<configuration status="off" monitorInterval="5">
<!-- 集中配置属性进行管理 使用时通过:${name} -->
<properties>
<property name="LOG_HOME">${web:rootDir}/WEB-INF/logs</property>
</properties>
<!-- 日志处理 -->
<Appenders>
<!-- 控制台输出 appender,SYSTEM_OUT输出黑色,SYSTEM_ERR输出红色 -->
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout
pattern="%d{HH:mm:ss.SSS} [%t] [%-5level] %c{36}:%L --- %m%n" />
</Console>
<!-- 日志文件输出 appender -->
<!-- <File name="file" fileName="${LOG_HOME}/myfile.log"> <PatternLayout
pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%-5level] %l %c{36} - %m%n" /> </File> -->
<!-- 使用随机读写流的日志文件输出 appender,性能提高 -->
<!-- <RandomAccessFile name="accessFile" fileName="${LOG_HOME}/myAcclog.log">
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%-5level] %l %c{36}
- %m%n" /> </RandomAccessFile> -->
<!-- 按照一定规则拆分的日志文件的appender --> <!-- 拆分后的文件 -->
<!-- filePattern="${LOG_HOME}/$${date:yyyy-MM-dd}/myrollog-%d{yyyy-MM-dd-HH-mm}-%i.log"> -->
<RollingFile name="rollingFile"
fileName="${LOG_HOME}/myrollog.log"
filePattern="${LOG_HOME}/olds/app-%d{yyyy-MM-dd}.log">
<!-- 日志级别过滤器 -->
<ThresholdFilter level="info" onMatch="ACCEPT"
onMismatch="DENY" />
<!-- 日志消息格式 -->
<PatternLayout
pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%-5level] %l %c{36} - %msg%n" />
<Policies>
<!-- 在系统启动时,出发拆分规则,生产一个新的日志文件 -->
<!-- <OnStartupTriggeringPolicy /> -->
<!-- 按照文件大小拆分,200MB -->
<SizeBasedTriggeringPolicy size="200MB" />
<!-- 按照时间节点拆分,规则根据filePattern定义的 -->
<TimeBasedTriggeringPolicy modulate="true"
interval="1" />
</Policies>
<!-- 在同一个目录下,文件的个限定为 30个,超过进行覆盖 -->
<DefaultRolloverStrategy max="10" />
</RollingFile>
<!-- 异步AsyncAppender -->
<!-- <Async name="Async"> <AppenderRef ref="rollingFile"/> </Async> -->
</Appenders>
<!-- logger 定义 -->
<Loggers>
<!-- 混合异步AsyncLogger -->
<AsyncLogger name="com.asyn.Main" level="trace"
additivity="false">
<appender-ref ref="rollingFile" />
</AsyncLogger>
<!-- 使用 rootLogger 配置 日志级别 level="trace" -->
<Root level="info">
<!-- 指定日志使用的处理器 -->
<AppenderRef ref="Console" />
<!-- <AppenderRef ref="file" /> -->
<!-- <AppenderRef ref="Async" /> -->
<!-- <AppenderRef ref="accessFile" /> -->
</Root>
</Loggers>
</configuration>
4、applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<!-- 自动扫描 -->
<context:component-scan base-package="com.app">
<context:exclude-filter type="regex"
expression="com.app.controller.*" />
</context:component-scan>
<!-- 引入数据库配置文件 -->
<context:property-placeholder
location="classpath:db.properties" />
<!-- 配置数据源 -->
<bean id="dataSource"
class="com.alibaba.druid.pool.DruidDataSource">
<property name="url" value="${druid.url}" />
<property name="username" value="${druid.username}" />
<property name="password" value="${druid.password}" />
</bean>
<!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件, 创建Session工厂 -->
<bean id="sqlSessionFactory"
class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 引入数据源 -->
<property name="dataSource" ref="dataSource" />
<!-- Aliases取别名 -->
<property name="typeAliasesPackage" value="com.app.domain" />
<!-- 引入mapper -->
<property name="mapperLocations"
value="classpath:mapper/*.xml"></property>
</bean>
<!-- DAO接口所在包名,Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.app.mapper" />
<property name="sqlSessionFactoryBeanName"
value="sqlSessionFactory"></property>
</bean>
<!-- 事务管理 -->
<bean id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 启用注解事务 -->
<tx:annotation-driven
transaction-manager="txManager" />
</beans>
5、springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--开启controller扫描 指定扫描的基础包 -->
<context:component-scan
base-package="com.app.controller" />
<!--开启注解扫描 -->
<mvc:annotation-driven />
<!-- jsp页面解析器,当Controller返回XXX字符串时,先通过拦截器,然后该类就会在/WEB-INF/views/目录下,查找XXX.jsp文件 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
6、web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>Archetype Created Web Application</display-name>
<!--初始化spring容器 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<!--读取spring文件夹下所有applicationContext-打头的文件 -->
<param-value>classpath:spring/applicationContext.xml</param-value>
</context-param>
<!--监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
<!-- 解决乱码 -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter
</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- springmvc的前端控制器 -->
<servlet>
<servlet-name>myapp</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<!-- contextConfigLocation不是必须的, 如果不配置contextConfigLocation, springmvc的配置文件默认在:WEB-INF/servlet的name+"-servlet.xml" -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>myapp</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
7、UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<!--指定命名空间-->
<mapper namespace="com.app.mapper.UserMapper">
<!--查询全部 id必须与接口的方法名对应-->
<select id="findUser" resultType="User">
select * from user where name=1
</select>
</mapper>
7、数据库数据
CREATE DATABASE;
USE `test`;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`username` varchar(50) NOT NULL,
`password` varchar(16) NOT NULL,
`tel` varchar(11) NOT NULL,
`email` varchar(30) NOT NULL,
`name` varchar(20) DEFAULT NULL,
PRIMARY KEY (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
insert into `user`(`username`,`password`,`tel`,`email`,`name`) values ('1','1','1','1','1'),('2','2','2','2','2'),('3','3','3','3','3');
四、Java代码
1、com.app.domain.User
package com.app.domain;
import java.io.Serializable;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @ClassName: User
*
* @Description: 用户类
*
* @author ***
*
* @date 2021年11月16日 下午6:16:25
*
*/
@Data // get、set方法
@NoArgsConstructor // 构成构造
@AllArgsConstructor // 全参构造
public class User implements Serializable {
private String username;
private String password;
private String tel;
private String email;
private String name;
}
2、com.app.mapper.UserMapper
package com.app.mapper;
import com.app.domain.User;
/**
* @ClassName: UserMapper
*
* @Description: 用户mapper
*
* @author **
*
* @date 2021年11月16日 下午6:17:12
*
*/
public interface UserMapper {
public User findUser();
}
3、com.app.service.UserService
package com.app.service;
import com.app.domain.User;
/**
* @ClassName: UserService
*
* @Description: 用户server接口
*
* @author **
*
* @date 2021年11月16日 下午6:18:08
*
*/
public interface UserService {
public User findUser();
}
4、com.app.service.impl.UserServiceImpl
package com.app.service.impl;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.app.domain.User;
import com.app.mapper.UserMapper;
import com.app.service.UserService;
/**
* @ClassName: UserServiceImpl
*
* @Description: 用户server实现
*
* @author **
*
* @date 2021年11月16日 下午6:18:31
*
*/
@Service
public class UserServiceImpl implements UserService {
// 注入UserMapper对象
@Resource
private UserMapper mapper;
@Override
public User findUser() {
return mapper.findUser();
}
}
5、com.app.controller.UserController
package com.app.controller;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.app.domain.User;
import com.app.service.UserService;
import lombok.extern.slf4j.Slf4j;
/**
* @ClassName: UserController
*
* @Description: TODO(这里用一句话描述这个类的作用)
*
* @author 陈玉明
*
* @date 2021年11月16日 下午6:19:59
*
*/
@Slf4j(topic = "com.asyn.Main")
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
public static final org.slf4j.Logger log1 = LoggerFactory.getLogger(UserController.class);
@RequestMapping("/all")
@ResponseBody
public User findUser() {
log.info("进入controller----日志异步写入文件");
log1.info("进入controller----日志同步写入控制台");
return userService.findUser();
}
}
五、运行项目
1、调用接口http://localhost:8080/myapp/user/all
2、控制台同步日志
3、日志文件异步日志
六、项目小知识
1、同一个Tomcate跑多个项目,需要在web.xml中区分不同项目
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>app1.root</param-value>
</context-param>
2、关于org.springframework.web.util.Log4jConfigListener启用问题
1)、spring5.0下可以使用log4j
使用log4j.properties配置日志(放在resources下,默认加载)
当需要相对日志文件路径,可以配置web.xml,通过${webapp.root}获取项目路径
<!-- 加载log4j文件 -->
<context-param>
<param-name>webAppRootKey</param-name>
<param-value>webapp.root</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:spring/log4j.properties</param-value>
</context-param>
<!--Spring刷新Log4j配置文件的间隔60秒,单位为millisecond -->
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener
</listener-class>
</listener>
2)、5.0及以上可以使用log4j2
使用log4j2.xml配置文件(放在resources下,默认加载)
当需要相对日志文件路径,注意添加jar,通过${web:rootDir}获取项目路径
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>2.14.1</version>
</dependency>
3)log4j2+Slf4j 使用教程
1、添加jar
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.14.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.14.1</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-web</artifactId>
<version>2.14.1</version>
</dependency>
<!--异步日志依赖 -->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>3.4.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.14.1</version>
</dependency>
2、创建log4j2.xml 配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!-- status="off" 日志框架本身的输出日志级别,可以修改为debug monitorInterval="5" 自动加载配置文件的间隔时间,不低于
5秒;生产环境中修改配置文件,是热更新,无需重启应用 -->
<configuration status="off" monitorInterval="5">
<!-- 集中配置属性进行管理 使用时通过:${name} -->
<properties>
<!-- <property name="LOG_HOME">${web:rootDir}/WEB-INF/logs</property> -->
<property name="LOG_HOME">D:\apache-tomcat-8.5.37\webapps\myapp\WEB-INF\logs
</property>
</properties>
<!-- 日志处理 -->
<Appenders>
<!-- 控制台输出 appender,SYSTEM_OUT输出黑色,SYSTEM_ERR输出红色 -->
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout
pattern="%d{HH:mm:ss.SSS} [%t] [%-5level] %c{36}:%L --- %m%n" />
</Console>
<!-- 日志文件输出 appender -->
<!-- <File name="file" fileName="${LOG_HOME}/myfile.log"> <PatternLayout
pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%-5level] %l %c{36} - %m%n" /> </File> -->
<!-- 使用随机读写流的日志文件输出 appender,性能提高 -->
<!-- <RandomAccessFile name="accessFile" fileName="${LOG_HOME}/myAcclog.log">
<PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%-5level] %l %c{36}
- %m%n" /> </RandomAccessFile> -->
<!-- 按照一定规则拆分的日志文件的appender --> <!-- 拆分后的文件 -->
<!-- filePattern="${LOG_HOME}/$${date:yyyy-MM-dd}/myrollog-%d{yyyy-MM-dd-HH-mm}-%i.log"> -->
<RollingFile name="rollingFile"
fileName="${LOG_HOME}/myrollog.log"
filePattern="${LOG_HOME}/olds/app-%d{yyyy-MM-dd}.log">
<!-- 日志级别过滤器 -->
<ThresholdFilter level="info" onMatch="ACCEPT"
onMismatch="DENY" />
<!-- 日志消息格式 -->
<PatternLayout
pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%-5level] %l %c{36} - %msg%n" />
<Policies>
<!-- 在系统启动时,出发拆分规则,生产一个新的日志文件 -->
<!-- <OnStartupTriggeringPolicy /> -->
<!-- 按照文件大小拆分,200MB -->
<SizeBasedTriggeringPolicy size="200MB" />
<!-- 按照时间节点拆分,规则根据filePattern定义的 -->
<TimeBasedTriggeringPolicy modulate="true"
interval="1" />
</Policies>
<!-- 在同一个目录下,文件的个限定为 30个,超过进行覆盖 -->
<DefaultRolloverStrategy max="10" />
</RollingFile>
<!-- 异步AsyncAppender -->
<!-- <Async name="Async"> <AppenderRef ref="rollingFile"/> </Async> -->
</Appenders>
<!-- logger 定义 -->
<Loggers>
<!-- 混合异步AsyncLogger -->
<AsyncLogger name="com.asyn" level="trace"
additivity="false">
<appender-ref ref="rollingFile" />
<appender-ref ref="Console" />
</AsyncLogger>
<!-- 使用 rootLogger 配置 日志级别 level="trace" -->
<!-- 同步 -->
<Root level="info">
<!-- 指定日志使用的处理器 -->
<AppenderRef ref="Console" />
<AppenderRef ref="rollingFile" />
<!-- <AppenderRef ref="file" /> -->
<!-- <AppenderRef ref="Async" /> -->
<!-- <AppenderRef ref="accessFile" /> -->
</Root>
</Loggers>
</configuration>
3、测试类
package com.test;
import org.junit.Test;
import org.slf4j.LoggerFactory;
import lombok.extern.slf4j.Slf4j;
/**
* @ClassName: TestLog4j2
*
* @Description: TODO(这里用一句话描述这个类的作用)
*
* @author
*
* @date 2021年11月19日 下午2:59:04
*
*/
@Slf4j(topic = "com.asyn") // 注解方式--异步--文件、控制台
// @Slf4j //注解方式--同步--文件、控制台
public class TestLog4j2 {
// 同步日志
public static final org.slf4j.Logger log2 = LoggerFactory.getLogger(TestLog4j2.class);
// 异步日志
public static final org.slf4j.Logger log3 = LoggerFactory.getLogger("com.asyn");
@Test
public void testInfo() {
// 1、注解方式
// 同步(打开第二个注解)
// log.info("注解--同步");
// 异步(打开第一个注解)
log.info("注解--异步");
// 2、实例方式
// 同步(打开第二个注解)
log2.info("实例--同步");
// 异步(打开第一个注解)
log3.info("实例--异步");
}
}
4、结果