如何使用构造函数@Autowire bean

Question

I am trying to define a bean and @Autowire org.springframework.jdbc.object.StoredProcedure which required 2 constructor. Is there a way I can pass constructor argument while wiring these beans ? Below is my code:

@Component("procedure")
public class ExecuteStoreProcedure extends AbstractImutableDAO{

    @Autowired
    private StoredProcedure procedure;

......
}

Here StoredProcedure have a constructor to pass jdbctemplate and procedure name, which is dynamic.

Answer 1

Maybe I do not understand the question, but you don't need constructor params while wiring, you configire your bean (StoredProcedure) in context.xml

<bean id="proc1" class="org.springframework.jdbc.object.StoredProcedure">
    <constructor-arg name="ds" ref="ds" />
    <constructor-arg name="name" value="proc1" />
</bean>

Spring creates it with the given constructor args and injects the bean into your field

@Autowired
private StoredProcedure procedure;

If dont want to use xml it does not change the idea

@Configuration
@PropertySource("spring.properties")
@EnableTransactionManagement
public class Test3 {
    @Autowired 
    Environment env;  

    @Bean 
    public ExecuteStoreProcedure getExecuteStoreProcedure() {
        ...
    }

    @Bean 
    public DataSource getDataSource() {
       ...
    }

    @Bean 
    public StoredProcedure getStoredProcedure() {
        return new MyStoredProcedure(getDataSource(), "proc1");
    }
...

Answer 2

When you @Autowire a field, you're assuming that a bean of the required type already exists in the ApplicationContext. So what you need to do in order to get this code to work is to declare a such a bean (either in XML or, if you want to configure it programmatically, using @Bean- see the Spring documentation here ).