1@bean的属性介绍

最新推荐文章于 2025-06-27 00:08:08 发布

转载最新推荐文章于 2025-06-27 00:08:08 发布 · 969 阅读

String[] value() default {};  //这个属性的作用我也不知道

String[] name() default {};  //bean的名字 默认方法的名字

Autowire autowire() default Autowire.NO;  是否对该bean的属性实行自动装配

String initMethod() default "";    //初始hua方法

String destroyMethod() default "(inferred)";//bean死亡时调用的方法


2@Bean的使用　　
　　实体类

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package liusheng.entity;

public class Student {
    private String name;
    private String password;

    public Student() {
    }

    public Student(String name, String password) {
        this.name = name;
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String toString() {
      return "Student{" +
              "name='" + name + '\'' +
              ", password='" + password + '\'' +
              '}';
    }

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配置文件

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<?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
        ">
        <context:component-scan base-package="liusheng"/>
</beans>

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　　产生Bean的工厂

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package liusheng.fatory;

import liusheng.entity.Student;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration//也可以使用@Component
public class StudentFactory {
    /*
        默认使用方法名，如果指定了name="student"
        那么bean的名字是student
     */

    /**
     * 默认使用
     * @return
     */
    @Bean
    public static Student getNotParameterStudent(){
        return new Student();
    }
    /*
        使用Beans上参数的名字，可以指定多个
     */
    @Bean(name={"student1","student2"})
    public static Student getNotParameterStudent1(){
        return new Student();
    }

    /**
     * 使用一个参数的名字
     * 由@Value给予
     * @param name
     * @return
     */
    @Bean
    @Value("张三")
    public static Student getOneParamterStudent(String name){

        return new Student(name,"123");
    }
    
    

}

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　　测试类

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package liusheng;

import liusheng.entity.Student;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Scope;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:SpringConfig.xml")
public class BeanTest {

    @Autowired
    Student student1;
    @Autowired
            @Qualifier("student1")
    Student student2;
    @Autowired
    @Qualifier("student1")
    Student student3;

    @Autowired
    @Qualifier("getOneParamterStudent")
    Student student4;
    @Test
    public void  test(){
        System.out.println(student1);
        System.out.println(student2);
        System.out.println(student3);
        System.out.println(student4);
    }
}

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　　结果