java - Spring 按类顺序对 bean 进行排序

Question

我有两个类，其中一个类应该在运行时在这两个类中首先执行，但情况恰恰相反。

头等舱:

@Configuration
public class A(){
@Bean
public void methodA(){}

@Bean
public void methodB(){
        for(i=0;i<9;i++){
            B b = new B();
            b.setJdbcUrl();
            b.setUsername();
            b.setPassword();
        }
    }
}

第二类:

@Configuration
public class B() extends HikariConfig {
@Bean
public HikariDataSource mysqlDataSource(){}

@Bean(name = "someEntityManager")
public LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder) {}

@Bean(name = "someTransactionManager")
public PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactory entityManagerFactory) {}

目前 Spring 遵循的顺序是:
1) b.mysqlDataSource()
2) b.LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder构建器)
3) b.PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactoryEntityManagerFactory)
4) a.methodA()
5) a.methodB()

我的订单应该遵循Spring:
1) a.methodA()
2) a.methodB()
3) b.mysqlDataSource()
4) b.LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder构建器)
5) b.PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactoryEntityManagerFactory)

并且它还必须经过代码，其中B类是唯一依赖于A类的所有url、用户名和密码设置的代码，因此必须首先启动A类。

Answer 1

您可以使用@DependsOn:

@Configuration
public class A {

    @Bean
    public void methodA() {
    }

    @DependsOn("methodA")    
    @Bean
    public void methodB() {
        for (i = 0; i < 9; i++) {
            B b = new B();
            b.setJdbcUrl();
            b.setUsername();
            b.setPassword();
        }
    }
}

@Configuration
@DependsOn({"methodA", "methodB"})
public class B extends HikariConfig {

    @DependsOn("mysqlEntityManagerFactory")
    @Bean
    public HikariDataSource mysqlDataSource() {
    }

    @DependsOn("mysqlTransactionManager")
    @Bean(name = "someEntityManager")
    public LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder) {
    }

    @Bean(name = "someTransactionManager")
    public PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactory entityManagerFactory) {
    }

}