标签：ioc 作用域 Spring testBean2 testBean1 Bean spring TestBean com
一、作用域
Spring的bean作用域包含Singleton、prototype、web（request、session、application、websocket）等作用域，当前以多例模式为例，展示使用方法。
二、环境
1.Pom
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.7.RELEASE</version>
</dependency>
<!--单元测试-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
三、具体实现
1.prototype
（1）TestBean类
设置包名称testBean2和作用域为多例
package com.spring.ioc;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
/**
* Created by Administrator on 2019/10/27.
*/
@Component("testBean2")
@Scope("prototype")
public class TestBean {
}
（2）TestConfiguration类设置内部Bean，id为testBean2，同时设置为多例模式
package com.spring.ioc;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
/**
* Created by Administrator on 2019/10/27.
*/
@Configuration
@ComponentScan("com.spring.ioc")
public class TestConfiguration {
@Bean("testBean1")
@Scope("prototype")
public TestBean testBean(){
return new TestBean();
}
}
（3）单元测试
package com.spring.ioc;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* Created by Administrator on 2019/10/27.
*/
public class TestCode {
@Test
public void test(){
ApplicationContext context=new AnnotationConfigApplicationContext(TestConfiguration.class);
for (int i = 0; i < 10; i++) {
TestBean testBean1=context.getBean("testBean1",TestBean.class);
System.out.println("testBean1 = " + testBean1);
}
System.out.println("============================");
for (int i = 0; i < 10; i++) {
TestBean testBean2=context.getBean("testBean2",TestBean.class);
System.out.println("testBean2 = " + testBean2);
}
}
}
结果：
testBean1 = com.spring.ioc.TestBean@3e3047e6
testBean1 = com.spring.ioc.TestBean@37e547da
testBean1 = com.spring.ioc.TestBean@2b6856dd
testBean1 = com.spring.ioc.TestBean@5db45159
testBean1 = com.spring.ioc.TestBean@6107227e
testBean1 = com.spring.ioc.TestBean@7c417213
testBean1 = com.spring.ioc.TestBean@15761df8
testBean1 = com.spring.ioc.TestBean@6ab7a896
testBean1 = com.spring.ioc.TestBean@327b636c
testBean1 = com.spring.ioc.TestBean@45dd4eda
============================
testBean2 = com.spring.ioc.TestBean@60611244
testBean2 = com.spring.ioc.TestBean@3745e5c6
testBean2 = com.spring.ioc.TestBean@5e4c8041
testBean2 = com.spring.ioc.TestBean@71c8becc
testBean2 = com.spring.ioc.TestBean@19d37183
testBean2 = com.spring.ioc.TestBean@1a0dcaa
testBean2 = com.spring.ioc.TestBean@3bd40a57
testBean2 = com.spring.ioc.TestBean@fdefd3f
testBean2 = com.spring.ioc.TestBean@d83da2e
testBean2 = com.spring.ioc.TestBean@a4102b8
标签：ioc,作用域,Spring,testBean2,testBean1,Bean,spring,TestBean,com 来源： https://blog.csdn.net/u010886217/article/details/102763658
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