day02_eesy_01anno_ioc 注解
package com.itheima.service.impl;
import com.itheima.dao.IAccountDao;
import com.itheima.dao.impl.AccountDaoImpl;
import com.itheima.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
/**
* 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>
*
* 注解配置:
* 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
* 以上三个注解的作用和属性与Component是一模一样的,
* 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,根据变量名注入
* 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上再按照名称注入,它在给类成员注入时不能单独使用(需要和@Autowired一起使用),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:用于指定注入bean的id
* 以上三种注解都只能注入其他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的数据
* 属性:value:用于指定数据的值,它可以使用spring中的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单例的 prototype多例的
* 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
*/
//@Component 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,value可以省略
@Component ("accountService")
public class AccountServiceImpl implements IAccountService {
/* @Autowired //自动按照类型注入
@Qualifier("accountDao1")*/
@Resource(name="accountDao1")
//访问修饰符 数据类型 变量名 数据类型
private IAccountDao accountDao = null;
@Override
public void saveAccount() {
accountDao.saveAccount();
}
}
day02_eesy_02acoount_xmlioc 实现基本增删改查
pom.xml
<?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>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--spring坐标-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--dbutils坐标-->
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency>
<!--mysql驱动坐标-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.43</version>
</dependency>
<!--连接池坐标-->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!--junit坐标-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
</project>
bean.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"
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="dateSource"></constructor-arg>
</bean>
\<!--配置数据源--\>
<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
\<!--注入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="root"></property>
</bean>
</beans>
day02_eesy_03acoount_annoioc
bean.xml
<?xml version="1.0" encoding="UTF-8"?>
<!--导入注解约束context-->
<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">
\<!--告知spring在创建容器时要扫描的包--\>
<context:component-scan base-package="com.itheima"></context:component-scan>
\<!--配置QueryRunner--\>
\<bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype"\>
\<!--注入数据源--\>
<constructor-arg name="ds" ref="dateSource"></constructor-arg>
</bean>
\<!--配置数据源--\>
<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
\<!--注入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="root"></property>
</bean>
</beans>
AccountServiceTest.java
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);
}
}
day02_eesy_04acoount_annoioc_withoutxml 使用注解配置,整合junit
pom.xml
<?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_day04account_annoioc_withoutxml</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<packaging>jar</packaging>
<dependencies>
<!--导入spring整合junit的jar包-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--spring坐标-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--dbutils坐标-->
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency>
<!--mysql驱动坐标-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.43</version>
</dependency>
<!--连接池坐标-->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!--junit坐标-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>
bean.xml
<?xml version="1.0" encoding="UTF-8"?>
<!--导入注解约束context-->
<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">
</beans>
jdbcConfig.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/eesy
jdbc.username=root
jdbc.password=root
SpringConfiguration
package config;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.context.annotation.*;
import javax.sql.DataSource;
/**
* 该类是一个配置类,它的作用和bean.xml是一样的
* spring中的新注解
* @Configuration
* 作用:指定当前类是一个配置类
* 细节:当配置类作为AnnotationConfigApplicationContext对象创建的参数时,该注解可以不写
* @ComponentScan
* 作用:用于通过注解指定spring在创建容器时要扫描的包
* 属性:value:它和basePackages的作用是一样的,都是用于指定创建容器时要扫描的包;
* 我们使用此注解,就等同于在xml中配置了:
* <context:component-scan base-package="com.itheima"></context:component-scan>
* @Bean
* 作用:用于把当前方法的返回值座位bean对象存入spring的ioc容器中
* 属性:name:用于指定bean的id,当不写时,默认值是当前方法的名称
* 细节:当我们使用注解配置方法时,诶过方法有参数,spring框架会去容器中查找有没有可用的bean对象,查找的方式和Autowired注解的作用是一样的
* @Import
* 作用:用于导入其他的配置类
* 属性:value:用于指定其他配置类的字节码
* 当我们使用Import的注解之后,有Import注解的类就是主配置(父配置类),而导入的都是子配置类
* @PropertySource
* 作用:用于指定properties文件的位置
* 属性:value:指定文件的名称和路径
* 关键字:calsspath:表示类路径下
*/
//@Configuration
@ComponentScan(basePackages = "com.itheima")
@Import(JdbcConfig.class)
@PropertySource("classpath:jdbcConfig.properties")
public class SpringConfiguration {
}
JdbcConfig
package config;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.beans.factory.annotation.Qualifier;
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;
/**
* 和spring连接数据库相关的配置类
*/
//@Configuration
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;
/**
* 用于创建一个QueryRunner对象
*/
@Bean(name = "runner")
@Scope("prototype")//QueryRunner是单例的需手动改为多例
public QueryRunner createQueryRunner(@Qualifier("ds1")DataSource dateSource) {
return new QueryRunner(dateSource);
}
/**
* 创建数据源对象
*
* @return
*/
@Bean(name ="ds1")
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);
}
}
@Bean(name ="ds2")
public DataSource createDataSource1() {
try {
ComboPooledDataSource ds = new ComboPooledDataSource();
ds.setDriverClass(driver);
ds.setJdbcUrl("jdbc:mysql://localhost:3306/eesy02");
ds.setUser(username);
ds.setPassword(password);
return ds;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
AccountServiceTest
package com.itheima.test;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import config.SpringConfiguration;
import org.junit.Before;
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包(坐标)
* 2、使用junit提供的注解把原有的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的创建是基于xml还是注解的,并且说明位置
* @ContextConfiguration
* location: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,spring要求junit的jar包必须是4.12及以上
*
*/
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfiguration.class)
public class AccountServiceTest {
@Autowired
private IAccountService as = null;
@Test
public void testFindAll(){
/**1、获取容器
bean.xml配置
ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
注解配置类
ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
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(){
//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);
//3、执行方法
as.saveAccount(account);
}
@Test
public void testUpdate(){
//3、执行方法
Account account = as.findAccountById(4);
account.setMoney(23456f);
as.updateAccount(account);
}
@Test
public void testDelete(){
//3、执行方法
as.deleteAccount(4);
}
}
QueryRunnerTest
package com.itheima.test;
import config.SpringConfiguration;
import org.apache.commons.dbutils.QueryRunner;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* 测试QueryRunner是否单例
*/
public class QueryRunnerTest {
@Test
public void testQueryRunner(){
//1、获取容器
ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
//2、获取queryRunner对象
QueryRunner runner = ac.getBean("runner",QueryRunner.class);
QueryRunner runner2 = ac.getBean("runner",QueryRunner.class);
System.out.println(runner==runner2);
}
}
AccountDaoImpl
package com.itheima.dao.impl;
/**
* 账户的持久层实现类
*/
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;
@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)value(?,?)",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);
}
}
}
IAccountDao
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 accountId
*/
void deleteAccount(Integer accountId);
}
Account
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 +
'}';
}
}
AccountServiceImpl
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 accountId) {
accountDao.deleteAccount(accountId);
}
}
IAccountService
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 accountId
*/
void deleteAccount(Integer accountId);
}