DI(Spring)
xmlファイル式
public class Office {
private String officeNo;
// getter/setter
@Override
public String toString() {
return "officeNo:" + officeNo;
}
}
public class Car {
private String brand;
private double price;
// getter/setter
@Override
public String toString() {
return "brand:" + brand + "," + "price:" + price;
}
}
public class Boss {
private Car car;
private Office office;
// getter/setter
@Override
public String toString() {
return "car:" + car + "\n" + "office:" + office;
}
}
<?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-2.5.xsd">
<bean id="boss" class="com.test.Boss">
<property name="car" ref="car"/>
<property name="office" ref="office" />
</bean>
<bean id="office" class="com.test.Office">
<property name="officeNo" value="001"/>
</bean>
<bean id="car" class="com.test.Car" scope="singleton">
<property name="brand" value="Toyota"/>
<property name="price" value="500"/>
</bean>
</beans>
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
Boss boss = (Boss) ac.getBean("boss");
インタフェース例
public class UserServiceImpl implements UserService {
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public void addUser(User user) {
userDao.saveUser(user);
}
}
public class UserDaoImpl implements UserDao {
public void saveUser(User user) {
// do something
}
}
<?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 id="a" class="org.xxx.dao.UserDaoImpl"></bean>
<bean id="b" class="org.xxx.dao.xxxDaoImpl"></bean>
<bean name="userService" class="org.xxx.bo.UserServiceImpl">
<property name="userDao" ref="a"></property>
</bean>
</beans>
ApplicationContext ac = new ClassPathXmlApplicationContext("beans.xml");
UserService service = (UserService) ac.getBean("userService");
service.addUser(new User());
アノテーション式（Spring 2.5から）
1、@Autowired org.springframework.beans.factory.annotation.Autowired;
2、@Qualifier org.springframework.beans.factory.annotation.Qualifier;
3、@Resource javax.annotation.Resource;
4、@Component org.springframework.stereotype.Component;
@Autowired, @Qualifier, @Resource
設定ファイルにbeanを書く必要がある
//★方法１
public class Boss {
@Autowired
private Car car;
@Autowired
private Office office;
//setterを削除
}
//★方法２
public class Boss {
private Car car;
private Office office;
//AutowiredはデフォルトがbyType、必要な場合はQualifierでbyName
@Autowired
public void setCar(@Qualifier(value="car")Car car) {
this.car = car;
}
@Autowired
public void setOffice(Office office) {
this.office = office;
}
// getter
}
//★方法３
public class Boss {
private Car car;
private Office office;
@Autowired
public Boss(Car car, Office office){
this.car = car;
this.office = office ;
}
// setter/getter
}
//★方法４ 推薦
public class Boss {
private Car car;
private Office office;
//ResourceはデフォルトがbyName
@Resource
public void setCar(Car car) {
this.car = car;
}
@Resource(name="office")
public void setOffice(Office office) {
this.office = office;
}
// getter
}
AutowiredAnnotationBeanPostProcessorのみ
<?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-2.5.xsd">
<!-- @AutowiredをつけるBeanに自動的にDI -->
<bean class="org.springframework.beans.factory.annotation.
AutowiredAnnotationBeanPostProcessor"/>
<!-- 設定はシンプルになる -->
<bean id="boss" class="com.test.Boss"/>
<bean id="office" class="com.test.Office">
<property name="officeNo" value="001"/>
</bean>
<bean id="car" class="com.test.Car" scope="singleton">
<property name="brand" value="Toyota"/>
<property name="price" value="500"/>
</bean>
</beans>
AutowiredAnnotationBeanPostProcessor
CommonAnnotationBeanPostProcessor
PersistenceAnnotationBeanPostProcessor
RequiredAnnotationBeanPostProcessor
<?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-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config/>
<bean>...省略...</bean>
</beans>
@Component
設定ファイルにbeanを書く必要がない
<?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-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:component-scan base-package="com.test"/>
</beans>
@Component(name="boss")
public class Boss {
private Car car;
private Office office;
@Resource
public void setCar(Car car) {
this.car = car;
}
@Resource
public void setOffice(Office office) {
this.office = office;
}
// getter
}
インタフェース例
@Component("userService")
public class UserServiceImpl implements UserService {
@Resource(name="userDao")
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public void addUser(User user) {
userDao.saveUser(user);
}
}
@Component("userDao")
public class UserDaoImpl implements UserDao {
public void saveUser(User user) {
// do something
}
}
<?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-3.0.xsd">
<context:component-scan base-package="org.xxx.*"/>
</beans>
