How to change XML-based Configuration to annotation configuration in Spring?

Question

The class is as following:

class ReportControllerBase {
    String reportName = "Report";

    public String getReportName() {
        return reportName;
    }

    public void setReportName(String reportName) {
        this.reportName = reportName;
    }

    // ...
}

class AnnualReportController extends ReportControllerBase {
    // ...
}

class SkinCareAnnualReprotController extends AnnualReportController {
    String productName;

    public String getProductName() {
        return productName;
    }

    public void setProductName(String productName) {
        this.productName = productName;
    }
}

And the XML-based configuration is as following:

<bean id="annualReportController" class="AnnualReportController">
    <property name="reportName" value="Annual Report"/>
</bean>

<bean id="annualSpecialReportController" class="AnnualReportController">
    <property name="reportName" value="Annual Special Report"/>
</bean>

<bean id="skinCareAnnualReprotController" class="SkinCareAnnualReprotController" parent="annualReportController">
    <property name="productName" value="A famous skin care product"/>
</bean>

The Bean annualReportController and annualSpecialReportController is the instance of the same Class. And skinCareAnnualReprotController is inherited from bean annualReportController.

How to implement this configuration in annotation-based configuration in Spring?

3 revs · Accepted Answer · 2012-08-06 19:56:37Z

1

@Configuration
public class ReportConfiguration {
    @Bean public AnnualReportController annualReportController() {
        AnnualReportController annualReportController = new AnnualReportController();
        annualReportController.setReportName("Annual Report");
        return annualReportController;
    }

     @Bean public AnnualReportController annualSpecialReportController() {
        AnnualReportController annualSpecialReportController = new AnnualReportController();
        return withAnnualSpecialReportName(annualSpecialReportController);
    }

     @Bean public SkinCareAnnualReportController skinCareAnnualReportController() {
        SkinCareAnnualReportController skinCareAnnualReportController = new SkinCareAnnualReportController();
        skinCareAnnualReportController.setProductName("A famous skin care product");
        return withAnnualSpecialReportName(skinCareAnnualReportController);
    }

    // in this instance, a helper method is arguably overkill,
    // but I've included it for demonstration
    private <T extends AnnualReportController> T withAnnualSpecialReportName(T report) {
        report.setReportName("Annual Special Report");
        return report;
    }
}

Take a look at the Spring 3.1 documentation for more information.

edited Aug 6, 2012 at 19:56

community wiki

3 revs
hertzsprung

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8 Comments

sourcedelica Over a year ago

You're also going to need to add @Qualifier to @Bean so you can inject the various AnnualReportControllers separately.

hertzsprung Over a year ago

@sourcedelica: you shouldn't need to if the field name is the same as the bean name

sourcedelica Over a year ago

Right - I guess I was assuming that injection was going to be done using @Autowire, not xml.

Liqun Sun Over a year ago

Thanks a lot! I still confused on how to implement skinCareAnnualReprotController inherit annualReportController, not annualSpecialReportController.

hertzsprung Over a year ago

I've updated to include the other two beans. Also, you have some misspellings of 'report', which I've corrected in my answer ;-)

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