1.基于注解的IOC配置

1.1导入jar包

<?xml version="1.0" encoding="UTF-8"?>
<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">
<modelVersion>4.0.0</modelVersion> <groupId>com.itheima</groupId>
<artifactId>day02_eesy_01anno_ioc</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging> <dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
</dependencies> </project>

1.2接口

package com.itheima.dao;

/**
* 账户的持久层接口
*/
public interface IAccountDao { /**
* 模拟保存账户
*/
void saveAccount();
}
package com.itheima.service;

/**
* 账户业务层的接口
*/
public interface IAccountService { /**
* 模拟保存账户
*/
void saveAccount();
}

1.3创建spring的xml配置文件并开启对注解的支持

<?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"> <!--把对象的创建交给spring来管理-->
<!--<bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl"></bean>--> <!--告知spring在创建容器时要扫描的包,配置所需要的标签不是在beans的约束中,而是一个名称为
context名称空间和约束中-->
<context:component-scan base-package="com.itheima"></context:component-scan>
</beans>

1.4使用@Component注解配置管理的资源

package com.itheima.service.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service; import javax.annotation.Resource; /**
* 账户的业务层实现类
*
* 曾经XML的配置:
* <bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl"
* scope="" init-method="" destroy-method="">
* <property name="" value="" | ref=""></property>
* </bean>
*
* 1.用于创建对象的
* 他们的作用就和在XML配置文件中编写一个<bean>标签实现的功能是一样的
* Component:
* 作用:用于把当前类对象存入spring容器中
* 属性:
* value:用于指定bean的id。当我们不写时,它的默认值是当前类名,且首字母改小写。
* Controller:一般用在表现层
* Service:一般用在业务层
* Repository:一般用在持久层
* 以上三个注解他们的作用和属性与Component是一模一样。
* 他们三个是spring框架为我们提供明确的三层使用的注解,使我们的三层对象更加清晰
*
* 2.用于注入数据的
* 他们的作用就和在xml配置文件中的bean标签中写一个<property>标签的作用是一样的
* Autowired:
* 作用:自动按照类型注入。只要容器中有唯一的一个bean对象类型和要注入的变量类型匹配,就可以注入成功
* 如果ioc容器中没有任何bean的类型和要注入的变量类型匹配,则报错。
* 如果Ioc容器中有多个类型匹配时:首先按照类型筛选,然后按照名称筛选
* 出现位置:
* 可以是变量上,也可以是方法上
* 细节:
* 在使用注解注入时,set方法就不是必须的了。
* Qualifier:
* 作用:在按照类中注入的基础之上再按照名称注入。它在给类成员注入时不能单独使用。但是在给方法参数注入时可以
* 属性:
* value:用于指定注入bean的id。
* Resource
* 作用:直接按照bean的id注入。它可以独立使用
* 属性:
* name:用于指定bean的id。
* 以上三个注入都只能注入其他bean类型的数据,而基本类型和String类型无法使用上述注解实现。
* 另外,集合类型的注入只能通过XML来实现。
*
* Value
* 作用:用于注入基本类型和String类型的数据
* 属性:
* value:用于指定数据的值。它可以使用spring中SpEL(也就是spring的el表达式)
* SpEL的写法:${表达式}
*
* 3.用于改变作用范围的
* 他们的作用就和在bean标签中使用scope属性实现的功能是一样的
* Scope
* 作用:用于指定bean的作用范围
* 属性:
* value:指定范围的取值。常用取值:singleton prototype
*
* 4.和生命周期相关(了解)
* 他们的作用就和在bean标签中使用init-method和destroy-method的作用是一样的
* PreDestroy
* 作用:用于指定销毁方法
* PostConstruct
* 作用:用于指定初始化方法
*/
@Service("accountService")
@Scope("prototype")
public class AccountServiceImpl implements IAccountService {
// @Autowired
// @Qualifier("accountDao2")
@Resource(name = "accountDao1")
private IAccountDao accountDao ; public void saveAccount(){
accountDao.saveAccount();
}
}
package com.itheima.dao.impl;

import com.itheima.dao.IAccountDao;
import org.springframework.stereotype.Repository; /**
* 账户的持久层实现类
*/
@Repository("accountDao1")
public class AccountDaoImpl implements IAccountDao { public void saveAccount(){ System.out.println("保存了账户1111111111");
}
}

1.5测试方法

package com.itheima.ui;

import com.itheima.dao.IAccountDao;
import com.itheima.service.IAccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; /**
* 模拟一个表现层,用于调用业务层
*/
public class Client { public static void main(String[] args) {
//1.获取核心容器对象
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.根据id获取Bean对象
IAccountService as = (IAccountService)ac.getBean("accountService");
IAccountService as2 = (IAccountService)ac.getBean("accountService"); System.out.println(as==as2); // IAccountDao adao = ac.getBean("accountDao", IAccountDao.class);
// System.out.println(adao);
// System.out.println(as); as.saveAccount();
}
}

2.常用注解

2.1用于创建对象的

相当于:<bean id="" class="">

1.@Component

2.@Controller @Service @Repository

2.2用于注入数据的

相当于:<property name="" ref="">
    <property name="" value="">

1. @Autowired

 2.@Qualifier

 3.@Resource

 4.@Value

2.3用于改变作用范围的

相当于:<bean id="" class="" scope="">

1.@Scope

2.4和生命周期相关的

相当于:<bean id="" class="" init-method="" destroy-method="" />

1.@PostConstruct

2.@PreDestroy

3.使用spring的IoC的实现账户的CURD

3.1 技术要求

使用 spring 的 IoC 实现对象的管理
使用 DBAssit 作为持久层解决方案
使用 c3p0 数据源

3.2导入jar包

<?xml version="1.0" encoding="UTF-8"?>
<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">
<modelVersion>4.0.0</modelVersion> <groupId>com.itheima</groupId>
<artifactId>day02_eesy_02account_xmlioc</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging> <dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency> <dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency> <dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies> </project>

3.3编写实体

package com.itheima.domain;

import java.io.Serializable;

/**
* 账户的实体类
*/
public class Account implements Serializable { private Integer id;
private String name;
private Float money; public Integer getId() {
return id;
} public void setId(Integer id) {
this.id = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public Float getMoney() {
return money;
} public void setMoney(Float money) {
this.money = money;
} @Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}

3.4编写持久层代码

package com.itheima.dao;

import com.itheima.domain.Account;

import java.util.List;

/**
* 账户的持久层接口
*/
public interface IAccountDao { /**
* 查询所有
* @return
*/
List<Account> findAllAccount(); /**
* 查询一个
* @return
*/
Account findAccountById(Integer accountId); /**
* 保存
* @param account
*/
void saveAccount(Account account); /**
* 更新
* @param account
*/
void updateAccount(Account account); /**
* 删除
* @param acccountId
*/
void deleteAccount(Integer acccountId);
}
package com.itheima.dao.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler; import java.util.List; /**
* 账户的持久层实现类
*/
public class AccountDaoImpl implements IAccountDao { private QueryRunner runner; public void setRunner(QueryRunner runner) {
this.runner = runner;
} @Override
public List<Account> findAllAccount() {
try{
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public Account findAccountById(Integer accountId) {
try{
return runner.query("select * from account where id = ? ",new BeanHandler<Account>(Account.class),accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public void saveAccount(Account account) {
try{
runner.update("insert into account(name,money)values(?,?)",account.getName(),account.getMoney());
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public void updateAccount(Account account) {
try{
runner.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public void deleteAccount(Integer accountId) {
try{
runner.update("delete from account where id=?",accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
}
}

3.5编写业务层代码

package com.itheima.service;

import com.itheima.domain.Account;

import java.util.List;

/**
* 账户的业务层接口
*/
public interface IAccountService { /**
* 查询所有
* @return
*/
List<Account> findAllAccount(); /**
* 查询一个
* @return
*/
Account findAccountById(Integer accountId); /**
* 保存
* @param account
*/
void saveAccount(Account account); /**
* 更新
* @param account
*/
void updateAccount(Account account); /**
* 删除
* @param acccountId
*/
void deleteAccount(Integer acccountId); }
package com.itheima.service.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService; import java.util.List; /**
* 账户的业务层实现类
*/
public class AccountServiceImpl implements IAccountService{ private IAccountDao accountDao; public void setAccountDao(IAccountDao accountDao) {
this.accountDao = accountDao;
} @Override
public List<Account> findAllAccount() {
return accountDao.findAllAccount();
} @Override
public Account findAccountById(Integer accountId) {
return accountDao.findAccountById(accountId);
} @Override
public void saveAccount(Account account) {
accountDao.saveAccount(account);
} @Override
public void updateAccount(Account account) {
accountDao.updateAccount(account);
} @Override
public void deleteAccount(Integer acccountId) {
accountDao.deleteAccount(acccountId);
}
}

3.6创建并编写配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 配置Service -->
<bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl">
<!-- 注入dao -->
<property name="accountDao" ref="accountDao"></property>
</bean> <!--配置Dao对象-->
<bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl">
<!-- 注入QueryRunner -->
<property name="runner" ref="runner"></property>
</bean> <!--配置QueryRunner-->
<bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<!--注入数据源-->
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean> <!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--连接数据库的必备信息-->
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/eesy"></property>
<property name="user" value="root"></property>
<property name="password" value="123456"></property>
</bean>
</beans>

3.7测试

package com.itheima.test;

import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; /**
* 使用Junit单元测试:测试我们的配置
*/
public class AccountServiceTest { @Test
public void testFindAll() {
//1.获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
List<Account> accounts = as.findAllAccount();
for (Account account:accounts ) {
System.out.println(account);
} } @Test
public void testFindOne() {
//1.获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
Account account = as.findAccountById(1);
System.out.println(account);
} @Test
public void testSave() {
Account account = new Account();
account.setName("test");
account.setMoney(12345f);
//1.获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
as.saveAccount(account);
} @Test
public void testUpdate() {
//1.获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
Account account = as.findAccountById(4);
account.setMoney(23456f);
as.updateAccount(account);
} @Test
public void testDelete() {
//1.获取容器
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
as.deleteAccount(4);
}
}

4.使用注解完成上述案例

4.1导入jar包

<?xml version="1.0" encoding="UTF-8"?>
<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">
<modelVersion>4.0.0</modelVersion> <groupId>com.itheima</groupId>
<artifactId>day02_eesy_04account_annoioc_withoutxml</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging> <dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency> <dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency> <dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies> </project>

4.2实体类

package com.itheima.domain;

import java.io.Serializable;

/**
* 账户的实体类
*/
public class Account implements Serializable { private Integer id;
private String name;
private Float money; public Integer getId() {
return id;
} public void setId(Integer id) {
this.id = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public Float getMoney() {
return money;
} public void setMoney(Float money) {
this.money = money;
} @Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}

4.3持久层代码

package com.itheima.dao;

import com.itheima.domain.Account;

import java.util.List;

/**
* 账户的持久层接口
*/
public interface IAccountDao { /**
* 查询所有
* @return
*/
List<Account> findAllAccount(); /**
* 查询一个
* @return
*/
Account findAccountById(Integer accountId); /**
* 保存
* @param account
*/
void saveAccount(Account account); /**
* 更新
* @param account
*/
void updateAccount(Account account); /**
* 删除
* @param acccountId
*/
void deleteAccount(Integer acccountId);
}
package com.itheima.dao.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository; import java.util.List; /**
* 账户的持久层实现类
*/
@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao { @Autowired
private QueryRunner runner; @Override
public List<Account> findAllAccount() {
try{
return runner.query("select * from account",new BeanListHandler<Account>(Account.class));
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public Account findAccountById(Integer accountId) {
try{
return runner.query("select * from account where id = ? ",new BeanHandler<Account>(Account.class),accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public void saveAccount(Account account) {
try{
runner.update("insert into account(name,money)values(?,?)",account.getName(),account.getMoney());
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public void updateAccount(Account account) {
try{
runner.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
}catch (Exception e) {
throw new RuntimeException(e);
}
} @Override
public void deleteAccount(Integer accountId) {
try{
runner.update("delete from account where id=?",accountId);
}catch (Exception e) {
throw new RuntimeException(e);
}
}
}

4.4业务层代码

package com.itheima.service;

import com.itheima.domain.Account;

import java.util.List;

/**
* 账户的业务层接口
*/
public interface IAccountService { /**
* 查询所有
* @return
*/
List<Account> findAllAccount(); /**
* 查询一个
* @return
*/
Account findAccountById(Integer accountId); /**
* 保存
* @param account
*/
void saveAccount(Account account); /**
* 更新
* @param account
*/
void updateAccount(Account account); /**
* 删除
* @param acccountId
*/
void deleteAccount(Integer acccountId); }
package com.itheima.service.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import java.util.List; /**
* 账户的业务层实现类
*/
@Service("accountService")
public class AccountServiceImpl implements IAccountService{ @Autowired
private IAccountDao accountDao; @Override
public List<Account> findAllAccount() {
return accountDao.findAllAccount();
} @Override
public Account findAccountById(Integer accountId) {
return accountDao.findAccountById(accountId);
} @Override
public void saveAccount(Account account) {
accountDao.saveAccount(account);
} @Override
public void updateAccount(Account account) {
accountDao.updateAccount(account);
} @Override
public void deleteAccount(Integer acccountId) {
accountDao.deleteAccount(acccountId);
}
}

4.5主配置类

package config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource; /**
* 该类是一个配置类,它的作用和bean.xml是一样的
*/ @ComponentScan(basePackages = {"com.itheima"})
@Import(JdbcConfig.class)
@PropertySource("classpath:jdbcConfig.properties")
public class SpringConfiguraiton { }

4.6数据库连接配置类

package config;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope; import javax.sql.DataSource; 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(name = "runner")
@Scope("prototype")
public QueryRunner createQueryRunner(DataSource dataSource) {
return new QueryRunner(dataSource);
} @Bean(name = "dataSource")
public DataSource createDataSource() {
try {
ComboPooledDataSource ds = new ComboPooledDataSource();
ds.setDriverClass(driver);
ds.setJdbcUrl(url);
ds.setUser(username);
ds.setPassword(password);
return ds;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}

4.7数据库配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/eesy
jdbc.username=root
jdbc.password=123456

4.8测试类

package com.itheima.test;

import config.SpringConfiguraiton;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; /**
* 使用Junit单元测试:测试我们的配置
*/
public class AccountServiceTest { private ApplicationContext ac;
private IAccountService as; @Before
public void init() {
//1.获取容易
ac = new AnnotationConfigApplicationContext(SpringConfiguraiton.class);
//2.得到业务层对象
as = ac.getBean("accountService", IAccountService.class);
} @Test
public void testFindAll() { //3.执行方法
List<Account> accounts = as.findAllAccount();
for (Account account : accounts) {
System.out.println(account);
}
} @Test
public void testFindOne() {
//1.获取容易
// ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguraiton.class);
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
Account account = as.findAccountById(1);
System.out.println(account);
} @Test
public void testSave() {
Account account = new Account();
account.setName("test");
account.setMoney(12345f);
//1.获取容易
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
as.saveAccount(account); } @Test
public void testUpdate() {
//1.获取容易
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
Account account = as.findAccountById(4);
account.setMoney(23456f);
as.updateAccount(account);
} @Test
public void testDelete() {
//1.获取容易
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
//2.得到业务层对象
IAccountService as = ac.getBean("accountService", IAccountService.class);
//3.执行方法
as.deleteAccount(4);
}
}

5.新注解说明

5.1@Configuration

5.2@ComponentScan

5.3@Bean

5.4@PropertySource

5.5@Import

6.spring整合junit案例

6.1问题

6.2解决思路分析

1、应用程序的入口
  main方法
2、junit单元测试中,没有main方法也能执行
  junit集成了一个main方法
  该方法就会判断当前测试类中哪些方法有 @Test注解
  junit就让有Test注解的方法执行
3、junit不会管我们是否采用spring框架
  在执行测试方法时,junit根本不知道我们是不是使用了spring框架
  所以也就不会为我们读取配置文件/配置类创建spring核心容器
4、由以上三点可知
  当测试方法执行时,没有Ioc容器,就算写了Autowired注解,也无法实现注入

6.3使用@RunWith注解替换原有运行器

6.4使用@ContextConfiguration  指定spring 配置文件/对象的位置

6.5使用@Autowired给测试类中的变量注入数据

6.6测试类

package com.itheima.test;

import config.SpringConfiguration;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import java.util.List; /**
* 使用Junit单元测试:测试我们的配置
* Spring整合junit的配置
* 1、导入spring整合junit的jar(坐标)
* 2、使用Junit提供的一个注解把原有的main方法替换了,替换成spring提供的
* @Runwith
* 3、告知spring的运行器,spring和ioc创建是基于xml还是注解的,并且说明位置
* @ContextConfiguration
* locations:指定xml文件的位置,加上classpath关键字,表示在类路径下
* classes:指定注解类所在地位置
*
* 当我们使用spring 5.x版本的时候,要求junit的jar必须是4.12及以上
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfiguration.class)
public class AccountServiceTest { @Autowired
private IAccountService as; @Test
public void testFindAll() { //3.执行方法
List<Account> accounts = as.findAllAccount();
for (Account account : accounts) {
System.out.println(account);
}
} }

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