03 Spring - HelloWorld开发者社区

IOC入门案例

导入依赖

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
</dependencies>

定义BookDao接口和BookDaoImpl实现类

public interface BookDao {
    public void save();
}

public class BookDaoImpl implements BookDao {
    public void save() {
        System.out.println("book dao save ...");
    }
}

定义BookService接口和BookServiceImpl实现类

public interface BookService {
    public void save();
}

public class BookServiceImpl implements BookService {
    private BookDao bookDao = new BookDaoImpl();
    public void save() {
        System.out.println("book service save ...");
        bookDao.save();
    }
}

定义applicationContext.xml配置文件并配置BookServiceImpl

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--
        bean标签：表示配置bean
        id属性：表示给bean起名字
        class属性：表示给bean定义类型
    -->
    <bean id="bookService" class="cn.lixuan.service.impl.BookServiceImpl"></bean>

</beans>

初始化IOC容器（Spring核心容器/Spring容器），通过容器获取Bean对象

public class App {
    public static void main(String[] args) {
        //1.创建IoC容器对象，加载spring核心配置文件
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        //2 从IOC容器中获取Bean对象(BookService对象)
        BookService bookService= (BookService)ctx.getBean("bookService");
        //3 调用Bean对象(BookService对象)的方法
        bookService.save();
    }
}

DI入门案例

BookServiceImpl中删除使用new的形式创建对象的代码

public class BookServiceImpl implements BookService {
    private BookDao bookDao;  //删除使用new的形式创建对象的代码
    public void save() {
        System.out.println("book service save ...");
        bookDao.save();
    }
}

提供依赖对象对应的setter方法

public class BookServiceImpl implements BookService {
    private BookDao bookDao;
    public void save() {
        System.out.println("book service save ...");
        bookDao.save();
    }
    //提供依赖对象对应的setter方法
    public void setBookDao(BookDao bookDao) {
        this.bookDao = bookDao;
    }
}

在applicationContext.xml中配置service与dao之间的关系

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--
        bean标签：表示配置bean
        id属性：表示给bean起名字
        class属性：表示给bean定义类型
    -->
    <bean id="bookDao" class="cn.lixuan.dao.impl.BookDaoImpl"/>

    <bean id="bookService" class="cn.lixuan.service.impl.BookServiceImpl">
        <!--配置server与dao的关系
            property标签：表示配置当前bean的属性
            name属性：表示配置哪一个具体的属性
            ref属性：表示参照哪一个bean
        -->
        <property name="bookDao" ref="bookDao"/>
    </bean>
</beans>

Bean的配置

别名配置

 <bean id="bookService" name="service bookEbi" class="cn.lixuan.service.impl.BookServiceImpl">

作用范围配置

<!-- prototype,  singleton等,默认为单例-->
<bean id="bookService" scope="singleton" class="cn.lixuan.service.impl.BookServiceImpl">

Bean的实例化

构造方法方式

BookDaoImpl实现类

public class BookDaoImpl implements BookDao {

    // 构造方法
    public BookDaoImpl() {
        System.out.println("book dao constructor is running ....");
    }
    public void save() {
        System.out.println("book dao save ...");
    }
}

AppForInstanceBook测试类

public void AppForInstanceBook() {
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");

    BookDao bookDao = (BookDao) ctx.getBean("bookDao");

    bookDao.save();
}

静态工厂方式

OrderDao接口和OrderDaoImpl实现类

public interface OrderDao {
    public void save();
}
public class OrderDaoImpl implements OrderDao {
    public void save() {
        System.out.println("order dao save ...");
    }
}

OrderDaoFatory工厂类

//静态工厂创建对象
public class OrderDaoFactory {
    // static
    public static OrderDao getOrderDao(){
        System.out.println("factory setup....");
        return new OrderDaoImpl();
    }
}

applicationContext.xml配置

<bean id="orderDao" class="cn.lixuan.factory.OrderDaoFactory" factory-method="getOrderDao"/>

AppForInstanceOrder测试类

public void AppForInstanceOrder() {
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");

    OrderDao orderDao = (OrderDao) ctx.getBean("orderDao");

    orderDao.save();
}

实例工厂方式

UserDaoFactory工厂类

//实例工厂创建对象
public class UserDaoFactory {
    public UserDao getUserDao(){
        return new UserDaoImpl();
    }
}

applicationContext.xml配置

<bean id="userFactory" class="cn.lixuan.factory.UserDaoFactory"/>

<bean id="userDao" factory-method="getUserDao" factory-bean="userFactory"/>

AppForInstanceUser测试类

public void AppForInstanceUser() {
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    UserDao userDao = (UserDao) ctx.getBean("userDao");
    userDao.save();
}

Bean的生命周期

方式一提供生命周期控制方法

public class BookDaoImpl implements BookDao {
    public void save() {
        System.out.println("book dao save ...");
    }
    //表示bean初始化对应的操作
    public void init(){
        System.out.println("init...");
    }
    //表示bean销毁前对应的操作
    public void destory(){
        System.out.println("destory...");
    }
}

方式二实现InitializingBean, DisposableBean接口

public class BookServiceImpl implements BookService, InitializingBean, DisposableBean {
    private BookDao bookDao;
    public void setBookDao(BookDao bookDao) {
        System.out.println("set .....");
        this.bookDao = bookDao;
    }
    public void save() {
        System.out.println("book service save ...");
        bookDao.save();
    }
    public void destroy() throws Exception {
        System.out.println("service destroy");
    }
    public void afterPropertiesSet() throws Exception {
        System.out.println("service init");
    }
}

applicationContext.xml配置

<!--init-method：设置bean初始化生命周期回调函数,此处填写init方法名-->
<!--destroy-method：设置bean销毁生命周期回调函数，仅适用于单例对象，此处填写destory方法名-->
<bean id="bookDao" class="cn.lixuan.dao.impl.BookDaoImpl" init-method="init" destroy-method="destory"/>

测试类

public void AppForLifeCycle() {
    //此处需要使用ClassPathXmlApplicationContext，ApplicationContext没有close方法
    ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    BookDao bookDao = (BookDao) ctx.getBean("bookDao");
    bookDao.save();

    //注册关闭钩子函数，在虚拟机退出之前回调此函数，关闭容器
    //ctx.registerShutdownHook();
    //关闭容器，执行销毁的方法
    ctx.close();

}

依赖注入

依赖注入的两种方式

setter注入, 构造器注入

<bean id="bookDao" class="cn.lixuan.dao.impl.BookDaoImpl"/>

<!-- setter引用类型注入 -->
<bean id="bookService" class="cn.lixuan.service.impl.BookServiceImpl">
    <property name="bookDao" ref="bookDao"/>
</bean>

<!-- setter简单类型注入 -->
<bean id="bookService" class="cn.lixuan.service.impl.BookServiceImpl">
    <property name="bookDao" value="20"/>
</bean>

<!-- 构造方式注入，需提供对应的构造方法 -->
<bean id="bookService" class="cn.lixuan.service.impl.BookServiceImpl">
    <constructor-arg name="bookDao" ref="bookDao"/>
</bean>

按类型自动装配

<bean id="bookDao" class="cn.lixuan.dao.impl.BookDaoImpl"/>
<bean id="bookService" class="cn.lixuan.service.impl.BookServiceImpl" autowire="byType"/>

集合注入

注入数组类型数据

<property name="array">
    <array>
        <value>100</value>
        <value>200</value>
        <value>300</value>
    </array>
</property>

注入List类型数据

<property name="list">
    <list>
        <value>itcast</value>
        <value>itheima</value>
        <value>boxuegu</value>
        <value>chuanzhihui</value>
    </list>
</property>

注入Set类型数据

<property name="set">
    <set>
        <value>itcast</value>
        <value>itheima</value>
        <value>boxuegu</value>
        <value>boxuegu</value>
    </set>
</property>

注入Map类型数据

<property name="map">
    <map>
        <entry key="country" value="china"/>
        <entry key="province" value="henan"/>
        <entry key="city" value="kaifeng"/>
    </map>
</property>

注入Properties类型数据

<property name="properties">
    <props>
        <prop key="country">china</prop>
        <prop key="province">henan</prop>
        <prop key="city">kaifeng</prop>
    </props>
</property>

第三方资源配置管理

管理Druid连接池

数据库准备

create database if not exists spring_db character set utf8;
use spring_db;
create table if not exists tbl_account(
    id int primary key auto_increment,
    name varchar(20),
    money double
);
insert into tbl_account values(null,'Tom',1000);
insert into tbl_account values(null,'Jerry',1000);

添加依赖

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.16</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>

配置DruidDataSource连接池Bean对象

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/spring_db"/>
    <property name="username" value="root"/>
    <property name="password" value="root"/>
</bean>

在测试类中从IOC容器中获取连接池对象并打印

public void duridTest)() {
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    DataSource dataSource = (DataSource) ctx.getBean("dataSource");
    System.out.println(dataSource);
}

管理C3P0连接池

添加c3p0连接池依赖

<dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
</dependency>

配置c3p0连接池Bean对象

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver"/>
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_db"/>
    <property name="user" value="root"/>
    <property name="password" value="root"/>
    <property name="maxPoolSize" value="1000"/>
</bean>

在测试类中从IOC容器中获取连接池对象并打印

public void c3p0Test {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        DataSource dataSource = (DataSource) ctx.getBean("dataSource");
        System.out.println(dataSource);
    }
}

加载properties属性文件

编写jdbc.properties属性文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/spring_db
jdbc.username=root
jdbc.password=root

在applicationContext.xml中开启开启context命名空间，加载jdbc.properties属性文件

<?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"
       xsi:schemaLocation="
            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
            ">
    <!-- 加载多个properties文件 -->
    <!-- <context:property-placeholder-location="jdbc.properties,msg.properties"/> -->

    <context:property-placeholder location="classpath*:*.properties" system-properties-mode="NEVER"/>

    <bean class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <bean id="bookDao" class="cn.lixuan.dao.impl.BookDaoImpl">
        <property name="name" value="${username}"/>
    </bean>

</beans>

Spring容器

加载多个配置文件

ApplicationContext ctx = new ClassPathXmlApplicationContext("bean1.xml", "bean2.xml");

获取Bean对象

使用bean名称获取（需要自己强制类型转换）
```
BookDao bookDao = (BookDao) ctx.getBean("bookDao");
```

使用bean名称获取并指定类型

BookDao bookDao = ctx.getBean("bookDao", BookDao.class);

使用bean类型获取（如果IOC容器中同类型的Bean对象有多个，此处获取会报错）
```
BookDao bookDao = ctx.getBean(BookDao.class);
```

Spring注解开发

@Component注解的三个衍生注解
- @Controller：用于表现层bean定义
- @Service：用于业务层bean定义
- @Repository：用于数据层bean定义

定义配置类代替配置文件

//声明当前类为Spring配置类
@Configuration
@ComponentScan("cn.lixuan")
//设置bean扫描路径，多个路径书写为字符串数组格式
//@ComponentScan({"cn.lixuan.service","cn.lixuan.dao"})
public class SpringConfig {
}

在测试类中加载配置类，获取Bean对象并使用

public void AppForAnnotation() {
    ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
    BookDao bookDao = (BookDao) ctx.getBean("bookDao");
    System.out.println(bookDao);

    BookService bookService = ctx.getBean(BookService.class);
    System.out.println(bookService);

}

作用范围与生命周期

@Repository
@Scope("singleton")
public class BookDaoImpl implements BookDao {
    public BookDaoImpl() {
        System.out.println("book dao constructor ...");
    }
    @PostConstruct
    public void init(){
        System.out.println("book init ...");
    }
    @PreDestroy
    public void destroy(){
        System.out.println("book destory ...");
    }
}

<!-- JDK9后使用@PostConstruct和@PreDestroy要导入依赖 -->
<dependency>
  <groupId>javax.annotation</groupId>
  <artifactId>javax.annotation-api</artifactId>
  <version>1.3.2</version>
</dependency>

自动装配

@Service
public class BookServiceImpl implements BookService {
    //@Autowired：注入引用类型，自动装配模式，默认按类型装配
    @Autowired
    //@Qualifier：自动装配bean时按bean名称装配
    //@Qualifier("bookDao")
    private BookDao bookDao;

    public void save() {
        System.out.println("book service save ...");
        bookDao.save();
    }
}

使用@Value实现简单类型注入

@Repository("bookDao")
public class BookDaoImpl implements BookDao {
    //@Value：注入简单类型（无需提供set方法）
    @Value("${name}")
    private String name;

    public void save() {
        System.out.println("book dao save ..." + name);
    }
}

// 以上@Value注解中使用${name}从属性文件中读取name值，那么就需要在配置类或者配置文件中加载属性文件

@Configuration
@ComponentScan("cn.lixuan")
//@PropertySource加载properties配置文件
@PropertySource({"classpath:jdbc.properties"}) //{}可以省略不写
public class SpringConfig {
}

注解开发管理第三方Bean

单独定义配置类

public class JdbcConfig {
    //@Bean：表示当前方法的返回值是一个bean对象，添加到IOC容器中
    @Bean
    public DataSource dataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");
        ds.setUrl("jdbc:mysql://localhost:3306/spring_db");
        ds.setUsername("root");
        ds.setPassword("root");
        return ds;
    }
}

将独立的配置类加入核心配置

@Configuration
@ComponentScan("cn.lixuan")
//@Import:导入配置信息
@Import({JdbcConfig.class})

//@ComponentScan({"cn.lixuan.config","cn.lixuan.service","cn.lixuan.dao"})  //只要cn.lixuan.config包扫到了就行，三个包可以合并写成cn.lixuan
public class SpringConfig {
}

注解开发为第三方Bean注入资源

public class JdbcConfig {
    //1.定义一个方法获得要管理的对象
    @Value("com.mysql.jdbc.Driver")
    private String driver;
    @Value("jdbc:mysql://localhost:3306/spring_db")
    private String url;
    @Value("root")
    private String userName;
    @Value("root")
    private String password;
    //2.@Bean：表示当前方法的返回值是一个bean对象，添加到IOC容器中
    @Bean
    public DataSource dataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        return ds;
    }
}

引用类型依赖注入

//Spring会自动从IOC容器中找到BookDao对象赋值给参数bookDao变量，如果没有就会报错。
@Bean 
public DataSource dataSource(BookDao bookDao){
    System.out.println(bookDao);
    DruidDataSource ds = new DruidDataSource();
    ds.setDriverClassName(driver);
    ds.setUrl(url);
    ds.setUsername(userName);
    ds.setPassword(password);
    return ds;
}

Spring整合

Spring整合Mybatis

添加依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.2.10.RELEASE</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.16</version>
</dependency>

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.6</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.2.10.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>1.3.0</version>
</dependency>

准备service和dao层基础代码

public interface AccountService {

    void save(Account account);

    void delete(Integer id);

    void update(Account account);

    List<Account> findAll();

    Account findById(Integer id);
}

@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountDao accountDao;

    public void save(Account account) {
        accountDao.save(account);
    }

    public void update(Account account){
        accountDao.update(account);
    }

    public void delete(Integer id) {
        accountDao.delete(id);
    }

    public Account findById(Integer id) {
        return accountDao.findById(id);
    }

    public List<Account> findAll() {
        return accountDao.findAll();
    }
}

public interface AccountDao {

    @Insert("insert into tbl_account(name,money)values(#{name},#{money})")
    void save(Account account);

    @Delete("delete from tbl_account where id = #{id} ")
    void delete(Integer id);

    @Update("update tbl_account set name = #{name} , money = #{money} where id = #{id} ")
    void update(Account account);

    @Select("select * from tbl_account")
    List<Account> findAll();

    @Select("select * from tbl_account where id = #{id} ")
    Account findById(Integer id);
}

创建JdbcConfig配置DataSource数据源

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_db?useSSL=false
jdbc.username=root
jdbc.password=root

public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;

    @Bean
    public DataSource dataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        return ds;
    }
}

创建MybatisConfig整合mybatis

public class MybatisConfig {
    //定义bean，SqlSessionFactoryBean，用于产生SqlSessionFactory对象
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("cn.lixuan.domain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }
    //定义bean，返回MapperScannerConfigurer对象
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("cn.lixuan.dao");
        return msc;
    }
}

创建SpringConfig主配置类进行包扫描和加载其他配置类

@Configuration
@ComponentScan("cn.lixuan")
//@PropertySource：加载类路径jdbc.properties文件
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}

定义测试类进行测试

public void springMyBatis() {
    ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);

    AccountService accountService = ctx.getBean(AccountService.class);

    Account ac = accountService.findById(1);
    System.out.println(ac);
}

Spring整合Junit

导入依赖

<!--junit-->
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.12</version>
</dependency>
<!--spring整合junit-->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>5.1.9.RELEASE</version>
</dependency>

加载配置文件或者配置类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {SpringConfig.class})
public class AccountServiceTest {
    //支持自动装配注入bean
    @Autowired
    private AccountService accountService;

    @Test
    public void testFindById(){
        System.out.println(accountService.findById(1));
    }

    @Test
    public void testFindAll(){
        System.out.println(accountService.findAll());
    }
}

AOP

导入aop相关坐标

<dependencies>
    <!--spring核心依赖，会将spring-aop传递进来-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>
    <!--切入点表达式依赖，目的是找到切入点方法，也就是找到要增强的方法-->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.9.4</version>
    </dependency>
</dependencies>

定义dao接口与实现类

public interface BookDao {
    public void save();
    public void update();
}

@Repository
public class BookDaoImpl implements BookDao {

    public void save() {
        System.out.println(System.currentTimeMillis());
        System.out.println("book dao save ...");
    }
    public void update(){
        System.out.println("book dao update ...");
    }
}

定义通知类，制作通知方法

//通知类必须配置成Spring管理的bean
@Component
public class MyAdvice {
    public void method(){
        System.out.println(System.currentTimeMillis());
    }
}

定义切入点表达式、配置切面(绑定切入点与通知关系)

//通知类必须配置成Spring管理的bean
@Component
//设置当前类为切面类类
@Aspect
public class MyAdvice {
    //设置切入点，@Pointcut注解要求配置在方法上方
    @Pointcut("execution(void cn.lixuan.dao.BookDao.update())")
    private void pt(){}

    //设置在切入点pt()的前面运行当前操作(前置通知)
    @Before("pt()")
    public void method(){
        System.out.println(System.currentTimeMillis());
    }
}

在配置类中进行Spring注解包扫描和开启AOP功能

@Configuration
@ComponentScan("cn.lixuan")
//开启注解开发AOP功能
@EnableAspectJAutoProxy
public class SpringConfig {
}

测试类和运行结果

public void testAOP() {
    ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
    BookDao bookDao = ctx.getBean(BookDao.class);
    bookDao.update();
}

切入点表达式

// *  ：单个独立的任意符号
// .. : 多个连续的任意符号
// +  : 专用于匹配子类类型

execution(void cn.lixuan.dao.BookDao.update())

通知类型

前置通知
后置通知
返回后通知：@AfterReturning
抛出异常后通知：@AfterThrowing

环绕通知：@Around

// 环绕通知方法的返回值建议写成Object类型, 用于将原始对象方法的返回值进行返回

@Around("pt()")
public Object around(ProceedingJoinPoint pjp) throws Throwable {
    System.out.println("around before advice ...");
    Object ret = pjp.proceed();
    System.out.println("around after advice ...");
    return ret;
}

AOP案例

测量业务层接口万次执行效率

编写通知类

@Component
@Aspect
public class ProjectAdvice {
    //匹配业务层的所有方法
    @Pointcut("execution(* cn.lixuan.service.*Service.*(..))")
    private void servicePt(){}

    //设置环绕通知，在原始操作的运行前后记录执行时间
    @Around("servicePt()")
    public void runSpeed(ProceedingJoinPoint pjp) throws Throwable {
        //获取执行的签名对象
        Signature signature = pjp.getSignature();
        //获取接口/类全限定名
        String className = signature.getDeclaringTypeName();
        //获取方法名
        String methodName = signature.getName();
        //记录开始时间
        long start = System.currentTimeMillis();
        //执行万次操作
        for (int i = 0; i < 10000; i++) {
           pjp.proceed();
        }
        //记录结束时间
        long end = System.currentTimeMillis();
        //打印执行结果
        System.out.println("万次执行："+ className+"."+methodName+"---->" +(end-start) + "ms");
    }
}

在SpringConfig配置类上开启AOP注解功能

@Configuration
@ComponentScan("cn.lixuan")
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
@EnableAspectJAutoProxy //开启AOP注解功能
public class SpringConfig {
}

运行测试类，查看结果

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTestCase {
    @Autowired
    private AccountService accountService;
    @Test
    public void testFindById(){
        Account account = accountService.findById(2);
    }
    @Test
    public void testFindAll(){
        List<Account> list = accountService.findAll();
    }
}

AOP切入点数据获取

获取参数

@Around("pt()")
public Object around(ProceedingJoinPoint pjp) throws Throwable {
    Object[] args = pjp.getArgs(); //获取连接点方法的参数们
    System.out.println(Arrays.toString(args));
    Object ret = pjp.proceed();
    return ret;
}

抛出异常后通知可以获取切入点方法中出现的异常信息，使用形参可以接收对应的异常对象

@AfterThrowing(value = "pt()",throwing = "t")
public void afterReturning(Throwable t) { //变量名要和returning="t"的属性值一致
    System.out.println("afterReturning advice ..."+t);
}

@Around("pt()")
public Object around(ProceedingJoinPoint pjp)  {
    Object ret = null;
    //此处需要try...catch处理，catch中捕获到的异常就是连接点方法中抛出的异常
    try {
        ret = pjp.proceed();
    } catch (Throwable t) {
        t.printStackTrace();
    }
    return ret;
}

环绕通知中可以手工书写对原始方法的调用，得到的结果即为原始方法的返回值

@Around("pt()")
public Object around(ProceedingJoinPoint pjp) throws Throwable {
    // 手动调用连接点方法，返回值就是连接点方法的返回值
    Object ret = pjp.proceed();
    return ret;
}

百度网盘密码数据兼容处理

service层

public interface ResourcesService {
    public boolean openURL(String url ,String password);
}
@Service
public class ResourcesServiceImpl implements ResourcesService {
    @Autowired
    private ResourcesDao resourcesDao;

    public boolean openURL(String url, String password) {
        return resourcesDao.readResources(url,password);
    }
}

dao层

public interface ResourcesDao {
    boolean readResources(String url, String password);
}
@Repository
public class ResourcesDaoImpl implements ResourcesDao {
    public boolean readResources(String url, String password) {
        System.out.println(password.length());
        //模拟校验
        return password.equals("root");
    }
}

编写通知类

@Component
@Aspect
public class DataAdvice {

    @Pointcut("execution(boolean cn.lixuan.service.*Service.*(*,*))")
    private void servicePt(){}

    @Around("DataAdvice.servicePt()")
    public Object trimStr(ProceedingJoinPoint pjp) throws Throwable {
        Object[] args = pjp.getArgs();
        for (int i = 0; i < args.length; i++) {
            //判断参数是不是字符串
            if(args[i].getClass().equals(String.class)){
                args[i] = args[i].toString().trim();
            }
        }
        Object ret = pjp.proceed(args);
        return ret;
    }
}

在SpringConfig配置类上开启AOP注解功能

@Configuration
@ComponentScan("cn.lixuan")
@EnableAspectJAutoProxy
public class SpringConfig {
}

运行测试类，查看结果

public void testBaidu() {
    ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
    ResourcesService resourcesService = ctx.getBean(ResourcesService.class);
    boolean flag = resourcesService.openURL("http://pan.baidu.com/haha", "root ");
    System.out.println(flag);
}

Spring事物管理

dao层

public interface AccountDao {

    @Update("update tbl_account set money = money + #{money} where name = #{name}")
    void inMoney(@Param("name") String name, @Param("money") Double money);

    @Update("update tbl_account set money = money - #{money} where name = #{name}")
    void outMoney(@Param("name") String name, @Param("money") Double money);
}

service层

public interface AccountService {
    /**
     * 转账操作
     * @param out 传出方
     * @param in 转入方
     * @param money 金额
     */

    //配置当前接口方法具有事务
    @Transactional
    public void transfer(String out,String in ,Double money) ;
}

@Service
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;

    public void transfer(String out,String in ,Double money) {
        accountDao.outMoney(out,money);
        int i = 1/0;
        accountDao.inMoney(in,money);
    }
}

在JdbcConfig中配置事务管理器

//配置事务管理器，mybatis使用的是jdbc事务
@Bean
public PlatformTransactionManager transactionManager(DataSource dataSource){
    DataSourceTransactionManager dtm = new DataSourceTransactionManager();
    dtm.setDataSource(dataSource);
    return dtm;
}

开启注解式事务驱动

@Configuration
@ComponentScan("cn.lixuan")
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
//开启注解式事务驱动
@EnableTransactionManagement
public class SpringConfig {
}

运行测试类，查看结果

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {

    @Autowired
    private AccountService accountService;

    @Test
    public void testTransfer() throws IOException {
        accountService.transfer("Tom","Jerry",100D);
    }
}

案例：转账业务追加日志

创建日志表

USE spring_db;
CREATE TABLE tbl_log(
    id INT PRIMARY KEY AUTO_INCREMENT,
    info VARCHAR(255),
    createDate DATE
);

准备环境

public interface LogService {
    //propagation设置事务属性：传播行为设置为当前操作需要新事务
    @Transactional
    void log(String out, String in, Double money);
}

@Service
public class LogServiceImpl implements LogService {

    @Autowired
    private LogDao logDao;
    public void log(String out,String in,Double money ) {
        logDao.log("转账操作由"+out+"到"+in+",金额："+money);
    }
}

public interface LogDao {
    @Insert("insert into tbl_log (info,createDate) values(#{info},now())")
    void log(String info);
}

在AccountServiceImpl中调用logService中添加日志的方法

@Service
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;

    @Autowired
    private LogService logService;

    public void transfer(String out,String in ,Double money) {
        try{
            accountDao.outMoney(out,money);
            int i = 1/0;
            accountDao.inMoney(in,money);
        }finally {
            logService.log(out,in,money);
        }
    }
}

在LogService的log()方法上设置事务的传播行为

public interface LogService {
    //propagation设置事务属性：传播行为设置为当前操作需要新事务
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    void log(String out, String in, Double money);
}

运行测试类，查看结果

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {
    @Autowired
    private AccountService accountService;

    @Test
    public void testTransfer() throws IOException {
        accountService.transfer("Tom","Jerry",50D);
    }
}

IOC入门案例

DI入门案例

Bean的配置

别名配置

作用范围配置

Bean的实例化

构造方法方式

静态工厂方式

实例工厂方式

Bean的生命周期

依赖注入

依赖注入的两种方式

按类型自动装配

集合注入

第三方资源配置管理

管理Druid连接池

管理C3P0连接池

加载properties属性文件

Spring容器

获取Bean对象

Spring注解开发

作用范围与生命周期

自动装配

使用@Value实现简单类型注入

注解开发管理第三方Bean

注解开发为第三方Bean注入资源

引用类型依赖注入

Spring整合

Spring整合Mybatis

Spring整合Junit

AOP

切入点表达式

通知类型

AOP案例

测量业务层接口万次执行效率

AOP切入点数据获取

百度网盘密码数据兼容处理

Spring事物管理

案例：转账业务追加日志

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