Spring依赖注入在singleton类中不起作用

Question

我做了一个名为AcessoCliente的单例类

public class AcessoCliente {

    private HashMap<String, Cliente> clientes;
    private new HashMap<String, Date> clientesNaoEncontrados;

    private static AcessoCliente instance;

    static {
        instance = new AcessoCliente();
    }

    public static AcessoCliente get() {
        return instance;
    }

    private AcessoCliente() {
        clientes = new HashMap<String, Cliente>();
        clientesNaoEncontrados = new HashMap<String, Date>();
    }

    /*business*/
}

但我需要对我的单例类执行一个名为ValidadorNivelDeAcessoBusiness的类的依赖注入

@Component
public class ValidadorNivelDeAcessoBusiness {

    @Autowired
    QuerysNiveisDeAcesso querysNiveisDeAcesso;
    /*business*/
}

public class AcessoCliente {

    @Autowired
    ValidadorNivelDeAcessoBusiness validadorNivelDeAcessoBusiness;

    private HashMap<String, Cliente> clientes;
    private new HashMap<String, Date> clientesNaoEncontrados;

    private static AcessoCliente instance;

    static {
        ApplicationContext context = new AnnotationConfigApplicationContext(AcessoCliente.class);
        instance = context.getBean(AcessoCliente.class);
    }

    public static AcessoCliente get() {
        return instance;
    }

    private AcessoCliente() {
        clientes = new HashMap<String, Cliente>();
        clientesNaoEncontrados = new HashMap<String, Date>();
    }

    /*business*/
}

@Component
public class QuerysNiveisDeAcesso extends QuerysClientes {

    public QueryIntegratorBuilder queryBuscaNiveisDeAcesso(String[] condicoesQuery) throws Exception {
        return super.executaQuery("BUSCA_NIVEIS_DE_ACESSO", condicoesQuery);
    }

    public QueryIntegratorBuilder queryBuscaNiveisDeAcesso() throws Exception {
        return super.executaQuery("BUSCA_NIVEIS_DE_ACESSO");
    }

    public QueryIntegratorBuilder queryBuscaNiveisDeAcesso(String sqlWhere, String[] condicoesQuery) throws Exception {
        return super.executaQuery("BUSCA_NIVEIS_DE_ACESSO", condicoesQuery, sqlWhere);
    }

}

Answer 1

你完全误用了Spring的目的。

首先，在Acessocliente类中创建应用程序上下文是没有意义的。

应用程序上下文是一个“全局”的Spring注册表对象，通常在整个应用程序中存在一次。

因此，总结一下，你需要这样的东西：

public class Main {
   public static void main(String  [] args) {
     ApplicationContext ctx = ...;
     ctx.getBean(SomeClassThatStartsTheFlow.class).doSomething();
   }    
}

@Service
public class AcessoCliente {

    @Autowired
    ValidadorNivelDeAcessoBusiness validadorNivelDeAcessoBusiness;

    private HashMap<String, Cliente> clientes;
    private new HashMap<String, Date> clientesNaoEncontrados;

    public AcessoCliente() {
        clientes = new HashMap<String, Cliente>();
        clientesNaoEncontrados = new HashMap<String, Date>();
    }

    /*business*/
}