[Java知识库]@Primary @ConfigurationProperties两个注解的理解

在学习这两个注解的同时又刷新了我对getter,setter方法的认识，下面为我写的一个案例(注意setter方法名)：

package com.fx.zhidao;

import org.junit.jupiter.api.Test;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

@SpringBootTest
class ZhidaoApplicationTests {

    @Resource
    A a;

    @Test
    void contextLoads() {
        a.test();
        System.out.println(a);
    }
}

interface A {
    void test();
}

@Component
class B implements A {
    @Override
    public void test() {
        System.out.println("BBBBBBBBBBBBBBBB");
    }
}

@Primary
@Component
@ConfigurationProperties("spring.datasource")
class C implements A {
    @Override
    public void test() {
        System.out.println("CCCCCCCCCCCCCCCCCCC");
    }

    private String driver_className;
    public String user_name;
    private String passWord;

    public void setDriver_className(String driver_class_name) {
        this.driver_className = driver_class_name;
    }

    public void setUser_name(String username) {
        this.user_name = username;
    }

    public void setPassWord2(String password) {
        this.passWord = password;
    }

    @Override
    public String toString() {
        return "C{" +
                "driver_class_name='" + driver_className + '\'' +
                ", username='" + user_name + '\'' +
                ", password='" + passWord + '\'' +
                '}';
    }

}