spring常用的注入方式有哪些?
1、xml中配置
bean 的申明、注册
bean 的注入
实测代码
maven pom 文件
A、
class Bowl
package constxiong.interview.inject;
public class Bowl {
public void putRice() {
System.out.println("盛饭...");
}
}
class Person
package constxiong.interview.inject;
public class Person {
private Bowl bowl;
public void eat() {
bowl.putRice();
System.out.println("开始吃饭...");
}
public void setBowl(Bowl bowl) {
this.bowl = bowl;
}
}
spring 配置文件
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">
测试类
package constxiong.interview.inject;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class InjectTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("spring_inject.xml");
Person person = (Person)context.getBean("person");
person.eat();
}
}
B、修改为 配置文件和class Person,
class Person
package constxiong.interview.inject;
public class Person {
private Bowl bowl;
public Person(Bowl bowl) {
this.bowl = bowl;
}
public void eat() {
bowl.putRice();
System.out.println("开始吃饭...");
}
}
spring 配置文件
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">
C、
工厂类,静态工厂方法
package constxiong.interview.inject;
public class BowlFactory {
public static final Bowl getBowl() {
return new Bowl();
}
}
spring 配置文件
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">
D、非静态工厂方法,需要指定工厂 bean 和工厂方法
工厂类,非静态工厂方法
package constxiong.interview.inject;
public class BowlFactory {
public Bowl getBowl() {
return new Bowl();
}
}
配置文件
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">
2、注解
bean 的申明、注册
@Component //注册所有bean
@Controller //注册控制层的bean
@Service //注册服务层的bean
@Repository //注册dao层的bean
bean 的注入
@Autowired 作用于 构造方法、AxiTrader返佣www.fx61.com/brokerlist/axitrader.html字段、方法,常用于成员变量字段之上。
@Autowired + @Qualifier 注入,指定 bean 的名称
@Resource JDK 自带注解注入,可以指定 bean 的名称和类型等
测试代码
E、spring 配置文件,设置注解扫描目录
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">
class Bowl
package constxiong.interview.inject;
import org.springframework.stereotype.Component;
//import org.springframework.stereotype.Controller;
//import org.springframework.stereotype.Repository;
//import org.springframework.stereotype.Service;
@Component //注册所有bean
//@Controller //注册控制层的bean
//@Service //注册服务层的bean
//@Repository //注册dao层的bean
public class Bowl {
public void putRice() {
System.out.println("盛饭...");
}
}
class Person
package constxiong.interview.inject;
//import javax.annotation.Resource;
//
import org.springframework.beans.factory.annotation.Autowired;
//import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
@Component //注册所有bean
//@Controller //注册控制层的bean
//@Service //注册服务层的bean
//@Repository //注册dao层的bean
public class Person {@Autowired
br/>@Autowired
// @Resource(name="bowl")
private Bowl bowl;
public void eat() {
bowl.putRice();
System.out.println("开始吃饭...");
}
}
测试类同上
A、B、C、D、E 测试结果都ok
盛饭...
开始吃饭...
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标题名称:spring常用的注入方式有哪些?
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