个人随笔
目录
Spring+MyBatis+Druid+数据库连接信息和自定义配置文件外放小程序（jar）完美模板
2020-09-11 22:19:29

学任何东西，做任何事情，都得先有原因，否则没有意义，就比如各种框架存在的意义。现在有一种经常遇到的情况，我们经常需要有一个独立的程序来处理一些业务逻辑，也就是小程序（此小程序非微信小程序）。这种小程序有很多，并且每一个都是独立运行，处理独立的业务逻辑，比如定时处理订单的明细数据，定时推送什么的。这种情况下小程序的要求很简单，可以连接数据库即可。

这里用Java小程序来实现，目的是可以连接数据库，控制事物即可，当然后续连接redis、rocketmq也是可以的。那么当然会想得到用spring控制事物，mybatis来操作数据库，数据库连接池用阿里的druid。

我们通常会遇到一个问题，那就是这种小程序打包成jar包后，进程会把一些配置文件，比如数据库链接，自定义的配置文件都打包到jar包里面，但是开发、测试、生产这些东西都是不同的，岂不是我们每次打包之前都要改动配置文件？这样子也太不科学了吧。

目的

  1. 搭建一个java小程序模板（可执行jar）,用spring管理事务，mybatis操作数据库，用阿里的连接池druid
  2. 右键run将该maven打包成一个可执行jar，包括spring依赖都打包成一个jar

项目结构


数据库链接信息以及自定义的配置文件都放在jar包外面也就是app.properties

1、pom.xml

  1. <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/xsd/maven-4.0.0.xsd">
  2.   <modelVersion>4.0.0</modelVersion>
  3.   <groupId>com.gdpost</groupId>
  4.   <artifactId>app-template</artifactId>
  5.   <version>0.0.1-SNAPSHOT</version>
  6.   <properties>
  7.         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  8.         <spring.version>5.1.6.RELEASE</spring.version>
  9.    </properties>
  10.   <dependencies>
  11.     <!--Spring框架核心库 -->
  12.     <dependency>
  13.             <groupId>org.springframework</groupId>
  14.             <artifactId>spring-context</artifactId>
  15.             <version>${spring.version}</version>
  16.     </dependency>
  17.     <dependency>
  18.         <groupId>org.springframework</groupId>
  19.         <artifactId>spring-core</artifactId>
  20.          <version>${spring.version}</version>
  21.     </dependency>
  22.     <dependency>
  23.         <groupId>org.springframework</groupId>
  24.         <artifactId>spring-beans</artifactId>
  25.         <version>${spring.version}</version>
  26.     </dependency>
  27.     <dependency>
  28.         <groupId>org.springframework</groupId>
  29.         <artifactId>spring-aop</artifactId>
  30.         <version>${spring.version}</version>
  31.     </dependency>
  32.     <dependency>
  33.        <groupId>org.springframework</groupId>
  34.        <artifactId>spring-jdbc</artifactId>
  35.        <version>${spring.version}</version>
  36.     </dependency>
  37.     <!-- spring整合oracle -->
  38.     <dependency>
  39.             <groupId>com.oracle</groupId>
  40.             <artifactId>ojdbc6</artifactId>
  41.             <version>12.1.0.1-atlassian-hosted</version>
  42.     </dependency>
  43.     <!-- spring整合mysql，和上面不冲突 -->
  44.     <dependency>
  45.         <groupId>mysql</groupId>
  46.         <artifactId>mysql-connector-java</artifactId>
  47.         <version>5.1.38</version>
  48.     </dependency>
  49.     <dependency>
  50.         <groupId>com.alibaba</groupId>
  51.         <artifactId>druid</artifactId>
  52.         <version>1.1.12</version>
  53.     </dependency>
  54.     <dependency>
  55.         <groupId>org.mybatis</groupId>
  56.         <artifactId>mybatis</artifactId>
  57.         <version>3.4.1</version>
  58.     </dependency>
  59.     <dependency>
  60.         <groupId>org.mybatis</groupId>
  61.         <artifactId>mybatis-spring</artifactId>
  62.         <version>1.3.0</version>
  63.     </dependency>    
  64.     <dependency>
  65.         <groupId>log4j</groupId>
  66.         <artifactId>log4j</artifactId>
  67.         <version>1.2.17</version>
  68.     </dependency>
  69.   </dependencies>
  70.   <build>
  71.         <plugins>
  72.             <plugin>
  73.                 <artifactId>maven-compiler-plugin</artifactId>
  74.                 <configuration>
  75.                     <source>1.6</source>
  76.                     <target>1.6</target>
  77.                 </configuration>
  78.             </plugin>
  80.             <plugin>
  81.                 <groupId>org.apache.maven.plugins</groupId>
  82.                 <artifactId>maven-shade-plugin</artifactId>
  83.                 <version>1.4</version>
  84.                 <configuration>
  85.                     <createDependencyReducedPom>false</createDependencyReducedPom>
  86.                 </configuration>
  87.                 <executions>
  88.                     <execution>
  89.                         <!-- 执行package的phase -->
  90.                         <phase>package</phase>
  91.                         <!-- 为这个phase绑定goal -->
  92.                         <goals>
  93.                             <goal>shade</goal>
  94.                         </goals>
  95.                         <configuration>
  96.                             <!-- 过滤掉以下文件，不打包 ：解决包重复引用导致的打包错误-->
  97.                             <filters>
  98.                                 <filter>
  99.                                     <artifact>*:*</artifact>
  100.                                     <excludes>
  101.                                         <exclude>META-INF/*.SF</exclude>
  102.                                         <exclude>META-INF/*.DSA</exclude>
  103.                                         <exclude>META-INF/*.RSA</exclude>
  104.                                     </excludes>
  105.                                 </filter>
  106.                             </filters>
  107.                             <transformers>
  108.                                 <transformer
  109.                                     implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
  110.                                     <resource>META-INF/spring.handlers</resource>
  111.                                 </transformer>
  112.                                 <!-- 打成可执行的jar包 的主方法入口-->
  113.                                 <transformer
  114.                                     implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
  115.                                     <mainClass>com.gdpost.App</mainClass>
  116.                                 </transformer>
  118.                                 <transformer
  119.                                     implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
  120.                                     <resource>META-INF/spring.schemas</resource>
  121.                                 </transformer>
  122.                             </transformers>
  123.                         </configuration>
  124.                     </execution>
  125.                 </executions>
  126.             </plugin>
  127.         </plugins>
  129.         <defaultGoal>compile</defaultGoal>
  131.     </build>
  132. </project>

这里用的是最新版的spring,以及用mybatis来操作数据库，要注意的是build中的内容，这里使用maven-shade-plugin插件将项目打成可执行的jar包，因为有第三方依赖包spring所以用这种方法可以把所有jar打包成一个可执行jar,当然用其他插件也是可以的。打包方式是maven-build 然后输入pacakege即可。

2、spring-mybatis.xml

  1. <beans xmlns="http://www.springframework.org/schema/beans"
  2.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  3.     xmlns:p="http://www.springframework.org/schema/p"
  4.     xmlns:aop="http://www.springframework.org/schema/aop" 
  5.     xmlns:context="http://www.springframework.org/schema/context"
  6.     xmlns:tx="http://www.springframework.org/schema/tx"
  7.     xsi:schemaLocation="http://www.springframework.org/schema/beans
  8.         http://www.springframework.org/schema/beans/spring-beans.xsd
  9.         http://www.springframework.org/schema/context
  10.         http://www.springframework.org/schema/context/spring-context-4.3.xsd
  11.         http://www.springframework.org/schema/aop
  12.         http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
  13.         http://www.springframework.org/schema/tx
  14.         http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
  15.     <!-- 自动扫描 -->
  16.     <context:component-scan base-package="com.gdpost" />
  17.     <!-- 引入配置文件:不需要 -->
  18.  <!--    <bean id="propertyConfigurer"
  19.         class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  20.         <property name="location" value="classpath:jdbc.properties" />
  21.     </bean> -->
  23.    <!--  <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
  24.         destroy-method="close">
  25.         <property name="driverClassName" value="${driver}" />
  26.         <property name="url" value="${url}" />
  27.         <property name="username" value="${username}" />
  28.         <property name="password" value="${password}" />
  29.     </bean> -->
  31.     <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
  32.     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  33.         <property name="dataSource" ref="dataSource" />
  34.         <!-- 自动扫描mapping.xml文件 -->
  35.         <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
  36.     </bean>
  38.     <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
  39.     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
  40.         <property name="basePackage" value="com.gdpost.mapper" />
  41.         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
  42.     </bean>
  44.     <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
  45.     <bean id="transactionManager"
  46.         class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  47.         <property name="dataSource" ref="dataSource" />
  48.     </bean>
  49.    <!--支持注解驱动的事务管理，指定事务管理器 -->
  50.     <tx:annotation-driven transaction-manager="transactionManager"/>
  51. </beans>

这个配置文件是最重要的配置文件，上面的内容都是必须的，我这里注释掉了数据库连接池对象的生成，因为我把数据库链接的配置信息移动到了外部，所以我这里直接用配置类来生成，如下：

3、DruidDataSourceConfiguration.java

  1. @Configuration
  2. public class DruidDataSourceConfiguration {
  3.     private String dbUrl = PropertiesUtil.get("dataSource.url");
  4.     private String username =PropertiesUtil.get("dataSource.username");
  5.     private String password =PropertiesUtil.get("dataSource.password");
  6.     private String driverClassName  =PropertiesUtil.get("dataSource.driver");
  7.     private int initialSize=Integer.parseInt(PropertiesUtil.get("dataSource.initialSize","5"));
  8.     private int minIdle= Integer.parseInt(PropertiesUtil.get("dataSource.minIdle","5"));
  9.     private int maxActive= Integer.parseInt(PropertiesUtil.get("dataSource.maxActive","20"));
  10.     private int maxWait= Integer.parseInt(PropertiesUtil.get("dataSource.maxWait","60000"));
  11.     private int timeBetweenEvictionRunsMillis= Integer.parseInt(PropertiesUtil.get("dataSource.timeBetweenEvictionRunsMillis","60000"));
  12.     private int minEvictableIdleTimeMillis= Integer.parseInt(PropertiesUtil.get("dataSource.minEvictableIdleTimeMillis","300000"));
  13.     private String validationQuery= PropertiesUtil.get("dataSource.validationQuery","SELECT 1 FROM DUAL");
  14.     private boolean testWhileIdle= Boolean.parseBoolean(PropertiesUtil.get("dataSource.testWhileIdle","true"));
  15.     private boolean testOnBorrow= Boolean.parseBoolean(PropertiesUtil.get("dataSource.testOnBorrow","false"));
  16.     private boolean testOnReturn= Boolean.parseBoolean(PropertiesUtil.get("dataSource.testOnReturn","false"));
  17.     private boolean poolPreparedStatements=Boolean.parseBoolean(PropertiesUtil.get("dataSource.poolPreparedStatements","true"));
  18.     private int maxPoolPreparedStatementPerConnectionSize= Integer.parseInt(PropertiesUtil.get("dataSource.maxPoolPreparedStatementPerConnectionSize","20"));
  19.     //wall, 去掉这个，不然会报sql injection violation
  20.     private String filters= PropertiesUtil.get("dataSource.filters","stat,log4j");
  21.     private String connectionProperties= PropertiesUtil.get("dataSource.connectionProperties","druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000");
  23.     @Bean     //声明其为Bean实例
  24.     @Primary  //在同样的DataSource中，首先使用被标注的DataSource
  25.     public DataSource dataSource() {
  26.         DruidDataSource datasource = new DruidDataSource();
  28.         datasource.setUrl(this.dbUrl);
  29.         datasource.setUsername(username);
  30.         datasource.setPassword(password);
  31.         datasource.setDriverClassName(driverClassName);
  33.         //configuration
  34.         datasource.setInitialSize(initialSize);
  35.         datasource.setMinIdle(minIdle);
  36.         datasource.setMaxActive(maxActive);
  37.         datasource.setMaxWait(maxWait);
  38.         datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
  39.         datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
  40.         datasource.setValidationQuery(validationQuery);
  41.         datasource.setTestWhileIdle(testWhileIdle);
  42.         datasource.setTestOnBorrow(testOnBorrow);
  43.         datasource.setTestOnReturn(testOnReturn);
  44.         datasource.setPoolPreparedStatements(poolPreparedStatements);
  45.         datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
  46.         try {
  47.             datasource.setFilters(filters);
  48.         } catch (SQLException e) {
  49.             e.printStackTrace();
  50.         }
  51.         datasource.setConnectionProperties(connectionProperties);
  53.         return datasource;
  54.     }
  55. }

@Configuration 表示这个java类是一个配置类，下面的dataSource就对应配置文件中注释掉的dataSource，这样子就不用从classpath下面获取链接信息啦，直接通过配置文件工具类PropertiesUtil从app.properties中获取，下面我们来看一下配置文件工具类怎么实现的。

4、PropertiesUtil.java

  1. /**
  2.  * 用完美的单例模式获取properties的数据，加载为map
  3.  * @author forever
  4.  *
  5.  */
  6. public class PropertiesUtil {
  7.     //值可变，引用不可变
  8.     private static final Properties PROPERTIES =new Properties();
  9.     static{
  10.         initProperties();
  11.     }
  12.     /**
  13.      * @param key
  14.      * @param defaultValue
  15.      * @return
  16.      */
  17.     public static String get(String key,String defaultValue){
  18.         if(PROPERTIES.isEmpty()) {
  19.             throw new UnsupportedOperationException("配置未加载");
  20.         }
  21.         String value =PROPERTIES.getProperty(key, defaultValue);
  22.         return  value;
  23.     }
  24.     /**
  25.      * 获取默认配置的值，这个值可以动态修改
  26.      * @param key
  27.      * @return
  28.      */
  29.     public static String get(String key){
  30.         return get(key, "");
  31.     }
  32.     private static void initProperties(){
  33.          InputStream is =null;
  34.          try {
  35.              //获取当前目录
  36.              String property = System.getProperty("user.dir");
  37.              //默认是linux os
  38.              String fileName = "/app.properties";
  39.              //判断是否是windows os
  40.              if(System.getProperty ("os.name").contains("Windows")) {
  41.                  fileName = "\\app.properties";
  42.              }
  43.              // 读取当前目录下conf配置文件
  44.              File file = new File(property+fileName);
  45.              PROPERTIES.clear();
  46.              is = new FileInputStream(file);
  47.              PROPERTIES.load(is);
  48.          }catch (IOException e) {
  49.               e.printStackTrace();
  50.          }finally {
  51.             if(is!=null) {
  52.                 try {
  53.                     is.close();
  54.                 } catch (IOException e) {
  55.                     // TODO Auto-generated catch block
  56.                     e.printStackTrace();
  57.                 }
  58.             }
  59.          }
  60.     }
  61. }

上面巧妙的用了这个方法

  1. String property = System.getProperty("user.dir");

来获取当前目录，这样子配置文件就跟jar包分开来啦，完美，并且在static静态代码块中来初始化配置类，这样子在第一次使用的时候就可以初始化了，然后我们来看一下我们的配置类：

5、app.properties

  1. ###数据库链接
  2. dataSource.driver=com.mysql.jdbc.Driver
  3. dataSource.url=jdbc:mysql://localhost:3306/weixinser
  4. dataSource.username=root
  5. dataSource.password=forever
  6. ###连接池配置信息(有默认配置)
  7. #dataSource.initialSize=5
  8. #dataSource.minIdle=5
  9. #dataSource.maxActive=20
  10. #dataSource.maxWait=60000
  11. #dataSource.timeBetweenEvictionRunsMillis=60000
  12. #dataSource.minEvictableIdleTimeMillis=300000
  13. #dataSource.validationQuery=SELECT 1 FROM DUAL
  14. #dataSource.testWhileIdle=true
  15. #dataSource.testOnBorrow=false
  16. #dataSource.testOnReturn=false
  17. #dataSource.poolPreparedStatements=true
  18. #dataSource.maxPoolPreparedStatementPerConnectionSize=20
  19. ###wall, 去掉这个，不然会报sql injection violation
  20. #dataSource.filters=stat,log4j
  21. #dataSource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
  23. ###下面是自定义配置
  24. username=lwh

上面的数据库链接只要换成oracle就对应oracle的数据库，并且链接池信息有默认的，修改的话就放开对应的注释即可。然后自定义配置就写在后面，获取配置信息的方法就是
PropertiesUtil.get("username");我们再看下我们的最重要的SpringUtil

6、SpringUtil.java

  1. public class SpringUtil {
  2.     private static ApplicationContext context = new ClassPathXmlApplicationContext("spring-mybatis.xml");
  3.     public static Object getBean(String serviceName){
  4.           return context.getBean(serviceName);
  5.     }
  6. }

这里是在开始用的时候就初始化了spring容器，然后就直接使用啦。
后面我们再列一下业务逻辑要使用的类：

7、User.java、UserMappper.java、UserMapper.xml、UserService.java、UserServiceImpl.java

User.java
  1. public class User{
  2.     private Long id;//自增的ID
  3.     private String username;//用户名
  4.     private String userId;//这个用来存放用户的userId，不要用自增键太不安全
  5.     private String password;//用户密码
  6.     private String nickname;//昵称
  7.     private String imgUrl;//用户头像
  8.     private String sex;//用户性别0女，1是男
  9.     private String age;//用户年龄
  10.     private String create_datetime;//用户创建时间
  11.     private String update_datetime;//用户修改时间
  12.     private String type;//用户类别0是管理员，1是已登录用户，2是游客
  13.     private String remark;//用户备注
  14.     private String visible;//用户是否有效
  15.     private String value;//预留字段
  16.     public Long getId() {
  17.         return id;
  18.     }
  19.     public void setId(Long id) {
  20.         this.id = id;
  21.     }
  22.     public String getUserId() {
  23.         return userId;
  24.     }
  25.     public void setUserId(String userId) {
  26.         this.userId = userId;
  27.     }
  28.     public String getUsername() {
  29.         return username;
  30.     }
  31.     public void setUsername(String username) {
  32.         this.username = username;
  33.     }
  34.     public String getPassword() {
  35.         return password;
  36.     }
  37.     public void setPassword(String password) {
  38.         this.password = password;
  39.     }
  40.     public String getNickname() {
  41.         return nickname;
  42.     }
  43.     public void setNickname(String nickname) {
  44.         this.nickname = nickname;
  45.     }
  46.     public String getImgUrl() {
  47.         return imgUrl;
  48.     }
  49.     public void setImgUrl(String imgUrl) {
  50.         this.imgUrl = imgUrl;
  51.     }
  52.     public String getSex() {
  53.         return sex;
  54.     }
  55.     public void setSex(String sex) {
  56.         this.sex = sex;
  57.     }
  58.     public String getAge() {
  59.         return age;
  60.     }
  61.     public void setAge(String age) {
  62.         this.age = age;
  63.     }
  64.     public String getCreate_datetime() {
  65.         return create_datetime;
  66.     }
  67.     public void setCreate_datetime(String createDatetime) {
  68.         create_datetime = createDatetime;
  69.     }
  70.     public String getUpdate_datetime() {
  71.         return update_datetime;
  72.     }
  73.     public void setUpdate_datetime(String updateDatetime) {
  74.         update_datetime = updateDatetime;
  75.     }
  76.     public String getType() {
  77.         return type;
  78.     }
  79.     public void setType(String type) {
  80.         this.type = type;
  81.     }
  82.     public String getRemark() {
  83.         return remark;
  84.     }
  85.     public void setRemark(String remark) {
  86.         this.remark = remark;
  87.     }
  88.     public String getValue() {
  89.         return value;
  90.     }
  91.     public void setValue(String value) {
  92.         this.value = value;
  93.     }
  94.     public String getVisible() {
  95.         return visible;
  96.     }
  97.     public void setVisible(String visible) {
  98.         this.visible = visible;
  99.     }
  100.     @Override
  101.     public String toString() {
  102.         return "User [id=" + id + ", username=" + username + ", userId="
  103.                 + userId + ", password=" + password + ", nickname=" + nickname
  104.                 + ", imgUrl=" + imgUrl + ", sex=" + sex + ", age=" + age
  105.                 + ", create_datetime=" + create_datetime + ", update_datetime="
  106.                 + update_datetime + ", type=" + type + ", remark=" + remark
  107.                 + ", visible=" + visible + ", value=" + value + "]";
  108.     }
UserMappper.java
  1. public interface UserMapper {
  2.     public List<com.gdpost.model.User> findAllUser();
  3.     public void insertUser(User user);
  4. }
UserMapper.xml
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <!DOCTYPE mapper
  3.         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  4.         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  5. <mapper namespace="com.gdpost.mapper.UserMapper">
  6.     <!--模板-->
  7.     <select id="findAllUser" resultType="com.gdpost.model.User">
  8.         select * from user
  9.     </select>
  10.     <insert id="insertUser" parameterType="com.gdpost.model.User">
  11.         insert into user(
  12.                 id,username,password,nickname,imgUrl,sex,age,create_datetime,update_datetime,type,remark,visible,value,userId
  13.         ) 
  14.         values(
  15.              #{id},#{username},#{password},#{nickname},#{imgUrl},#{sex},#{age},#{create_datetime},#{update_datetime},#{type},#{remark},#{visible},#{value},#{userId}
  16.         )
  17.     </insert>
  18. </mapper>
UserService.java
  1. public interface UserService {
  2.     public List<User> findAllUser();
  3.     public void insertUser();
  4. }
UserServiceImpl.java
  1. @Service("userService")
  2. public class UserServiceImpl implements UserService{
  3.     @Autowired
  4.     private UserMapper userMapper;
  5.     public List<User> findAllUser() {
  6.         List<User> users = userMapper.findAllUser();
  7.         return users;
  8.     }
  9.     //事务控制成功
  10.     @Transactional
  11.     public void insertUser() {
  12.         User user1 = new User();
  13.         user1.setId(1l);
  14.         user1.setUsername("1");
  15.         user1.setPassword("1");
  16.         user1.setUserId("1");
  17.         userMapper.insertUser(user1);
  18.         int i=1/0;
  19.         User user2 = new User();
  20.         user2.setId(2l);
  21.         user2.setUsername("2"+i);
  22.         user2.setPassword("2");
  23.         user2.setUserId("2");
  24.         userMapper.insertUser(user2);
  26.     }
  28. }

insertUser方法是测试事务，经过测试，事务可以回滚。

8、App.java

  1. public class App {
  2.     private static final Logger log = Logger.getLogger(App.class);
  3.     public static void main(String[] args) {
  4.         UserService userService =(UserService) SpringUtil.getBean("userService");
  5.         List<User> users = userService.findAllUser();
  6.         log.info("user:"+users);
  7.         userService.insertUser();
  8.     }
  9. }

这个是启动类，直接使用即可。

GITHUB地址

https://github.com/suibibk/app-template.git

总结

以后可以直接用了，美滋滋

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