标签：文件 两种 one rod ini ati enc ack 有一个
2017-11-06 21:19:43
一、Spring的注解装配Bean
Spring2.5 引入使用注解去定义Bean
Spring的框架中提供了与@Component注解等效的三个注解
//因为只有一个属性value，所以可以直接写。一般需要value="..."
@Component("user")
public class User {
public void sayHello(){
System.out.println("Hello World.");
}
}
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"
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"> <!-- bean definitions here -->
<context:component-scan base-package="spring5"/>
</beans>
二、注解进行属性注入
普通属性：@Value（value="..."）,这时候可以不写setter方法
对象属性：@Resource（name = "...."）
//因为只有一个属性value，所以可以直接写。一般需要value="..."
@Component("user")
public class User {
@Value(value="Spring")
private String s;
public void sayHello(){
System.out.println("Hello World.");
}
@Override
public String toString() {
return "User{" +
"s=‘" + s + ‘\‘‘ +
‘}‘;
}
}
三、XML和注解的混合使用
两种方式结合：一般使用XML注册Bean,使用注解进行属性的注入
首先介绍一些其他的注解配置：
(1)配置 Bean 初始化方法和销毁方法 :
* init-method 和 destroy-method.
@PostConstruct
public void setup(){
System.out.println("初始化...");
}
@PreDestroy
public void teardown(){
System.out.println("销毁...");
}
(2) 配置 Bean 的作用范围 :@Scope
@Component("user")
@Scope(value="prototype")
public class User {
@Value(value="Spring")
private String s;
public void sayHello(){
System.out.println("Hello World.");
}
@Override
public String toString() {
return "User{" +
"s=‘" + s + ‘\‘‘ +
‘}‘;
}
}
(3)使用Java类来进行配置信息，在XML中扫描一下即可
@Configuration
public class BeanConfig {
@Bean(name = "car")
public Car showCar() {
Car car = new Car();
car.setName("长安");
car.setPrice(40000d);
return car;
}
@Bean(name = "product")
public Product initProduct() {
Product product = new Product();
product.setName("空调");
product.setPrice(3000d);
return product;
}
}
混合使用范例：
public class Person {
@Autowired
@Qualifier("car")
private Car car;
@Autowired
@Qualifier(value = "plane")
private Plane plane;
@Override
public String toString() {
return "Person{" +
"car=" + car +
", plane=" + plane +
‘}‘;
}
}
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"
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"> <!-- bean definitions here -->
<!--使属性注入注解生效-->
<context:annotation-config/>
<bean id="car" class="spring6.Car"/>
<bean id="plane" class="spring6.Plane"/>
<bean id="person" class="spring6.Person">
</bean>
</beans>
四、集成Junit测试
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:spring-config.xml")
public class spring6 {
@Autowired
@Qualifier("person")
private Person p;
@Test
public void demo(){
System.out.println(p);
}
}
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"
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"> <!-- bean definitions here -->
<!--使属性注入注解生效-->
<context:annotation-config/>
<bean id="car" class="spring6.Car"/>
<bean id="plane" class="spring6.Plane"/>
<bean id="person" class="spring6.Person">
</bean>
</beans>
标签：文件 两种 one rod ini ati enc ack 有一个
原文地址：http://www.cnblogs.com/TIMHY/p/7795560.html
