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我正在寻找一种方法来覆盖与 GuiceServletContextListener 中的 guice 绑定的球衣资源。我正在尝试使用的代码：

//Define Jersey resource interface
@Path("/books/{key}")
public interface BookDocument {

    public BookDAO getDao();

    public void setDao(BookDAO dao);
}

//Define default implementation
public class BookImpl implements Book {

    @Override
    public BookDAO getDao() {
        return dao;
    }

    @Inject
    @Override
    public void setDao(BookDAO dao) {
        this.dao = dao;
    }
}

//User wants to inject his implementation, so he define it
public class BookUserImpl implements Book {

    @Override
    public BookDAO getDao() {
        return dao;
    }

    @Inject
    @Override
    public void setDao(BookDAO dao) {
        this.dao = dao;
    }
}

//Inject default implementation of resource
public class ApplicationResourcesModule extends AbstractModule
{
    @Override
    protected void configure()
    {
        bind(Book).to(BookImpl);
    }
}

//But user wants to inject his implementation, so he bind it in users AbstractModule
public class ApplicationResourcesModuleUser extends AbstractModule
{
    @Override
    protected void configure()
    {
        bind(Book).to(BookUserImpl);
    }
}

//Bind all resources
public class JerseyGuiceConfig extends GuiceServletContextListener
{
    @Override
    protected Injector getInjector()
    {
        //Override default binding by user bindings.
        return Guice.createInjector(Modules.override(new ApplicationResourcesModule()).with(new ApplicationResourcesModuleUser()), new JerseyServletModule());
    }
}

但不幸的是，这不起作用，虽然我不能将球衣资源绑定到 guice 中，比如接口到实现，只能bind(BookImpl.class)工作。但是这样的绑定是不可能被覆盖的。如果我尝试覆盖bind(BookImpl.class)我bind(BookUserImpl.class)会得到一个错误Conflicting URI templates. The URI template /books/{key} for root resource class.，而 @Path 应该是唯一的。那么我的用例有什么解决方案吗？

4

1 回答 1

0

我只是不想警告您 Modules.override 在 Guice.createInjector(Stage.PRODUCTION,...) 上不起作用，因此您应该小心地将其仅用于开发。您应该创建两个上下文侦听器并以某种方式（可以说是通过 maven 配置文件）设置 web.xml 并正确实现。

更好地使用：

//Inject default implementation of resource
public class MainModule extends AbstractModule
{
    @Override
    protected void configure()
    {
        if(currentStage().equals(Stage.PRODUCTION) {
          install(new ApplicationResourcesModuleUser());
        } else {
          install(new ApplicationResourcesModule());
        }
    }
}

//Bind all resources
public class JerseyGuiceConfigPROD extends GuiceServletContextListener
{
    @Override
    protected Injector getInjector()
    {
        //Override default binding by user bindings.
        return Guice.createInjector(Stage.PRODUCTION, new MainModule(), new JerseyServletModule());
    }
}

public class JerseyGuiceConfigDEV extends GuiceServletContextListener
{
    @Override
    protected Injector getInjector()
    {
        //Override default binding by user bindings.
        return Guice.createInjector(Stage.DEVELOPMENT, new MainModule(), new JerseyServletModule());
    }
}

您可以使用 @ImplementedBy 注释到您的界面来说明默认实现应该是。因此，您不必显式绑定它，并且如果您绑定它，它将覆盖注释绑定。

@Path("/books/{key}")
@ImplementedBy(BookImpl.class)
public interface Book {

    public BookDAO getDao();

    @Inject //it is enough to put the injection here, i think
    public void setDao(BookDAO dao);
}

我认为这个问题与 Book 和 Book 实现绑定无关，而是与将 servlet 绑定/注册到 Jersey 容器有关。您能否粘贴整个堆栈跟踪，guice 堆栈跟踪很冗长且非常有用。

于 2013-08-16T08:00:05.757 回答