1、创建一个maven项目(创建maven项目过程省略),pom.xml文件引入如下依赖:
org.springframework
spring-context
5.2.0.RELEASE
junit
junit
4.12
test
2、创建一个Employee的类,使用@Value给属性赋值,代码如下:
package com.rf.bean;
import org.springframework.beans.factory.annotation.Value;
public class Employee {
//使用@Value赋值;
//1、基本数值
//2、可以写SpEL; #{}
//3、可以写${};取出配置文件【properties】中的值(在运行环境变量里面的值)
private Integer id;
@Value("张三")
private String name;
@Value("#{23-3}")
private Integer age;
private Integer did; //部门id
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 Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Integer getDid() {
return did;
}
public void setDid(Integer did) {
this.did = did;
}
@Override
public String toString() {
return "Employee [id=" + id + ", name=" + name + ", age=" + age + ", did=" + did + "]";
}
}
3、编写配置类,代码如下:
package com.rf.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.rf.bean.Employee;
@Configuration
public class MyConfig {
@Bean
public Employee employee(){
return new Employee();
}
}
4、编写测试类,代码如下:
package com.rf.test;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import com.rf.config.MyConfig;
public class Test1 {
@org.junit.Test
public void test1(){
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(MyConfig.class);
System.out.println("ioc容器创建完成了。。。。");
Object bean = ctx.getBean("employee");
System.out.println(bean);
//关闭容器执行销毁方法
ctx.close();
}
}
5、启动测试类,运行效果如下: