Question

由于插件架构，我正在尝试以编程方式将bean添加到我的webapp中。我有一个通过@Component注释创建的Spring bean，我正在实现ApplicationContextAware接口。

我的覆盖功能如下所示：

@Override
public void setApplicationContext(ApplicationContext applicationContext)
        throws BeansException {

    // this fails
    this.applicationContext = (GenericWebApplicationContext) applicationContext;
 }

基本上，我无法弄清楚如何将bean添加到setApplicationContext的applicationContext对象中。任何人都可以告诉我，我的方式是错误的吗？

好的，这就是我最终得到的解决方案：

@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry bdr)
        throws BeansException {
    BeanDefinition definition = new RootBeanDefinition(
            <My Class>.class);

    bdr.registerBeanDefinition("<my id>", definition);
}

Answer 1

在Spring 3.0中，您可以创建bean实现BeanDefinitionRegistryPostProcessor并通过BeanDefinitionRegistry添加新bean。

在以前的Spring版本中，您可以在BeanFactoryPostProcessor中执行相同的操作（尽管您需要将BeanFactory转换为BeanDefinitionRegistry，这可能会失败）。

Answer 2

这是一个简单的代码：

ConfigurableListableBeanFactory beanFactory = ((ConfigurableApplicationContext) applicationContext).getBeanFactory();
beanFactory.registerSingleton(bean.getClass().getCanonicalName(), bean);

Answer 3

为什么需要它为GenericWebApplicationContext类型？
我认为您可以使用任何ApplicationContext类型。

通常你会使用init方法（除了你的setter方法）：

@PostConstruct
public void init(){
    AutowireCapableBeanFactory bf = this.applicationContext
        .getAutowireCapableBeanFactory();
    // wire stuff here
}

你可以使用

连接bean

AutowireCapableBeanFactory.autowire(Class, int mode, boolean dependencyInject)

或

AutowireCapableBeanFactory.initializeBean(Object existingbean, String beanName)

Answer 4

实际上<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <section id="solBlocks"> <div class="solutionBlock"> <div class="overlay"></div> <img src="http://via.placeholder.com/300" alt="A"> <div class="total-center front"> <h2 class="sBlockTitle">A</h2> </div> </div><div class="solutionBlock"> <div class="overlay"></div> <img src="http://via.placeholder.com/300" alt="B"> <div class="total-center front"> <h2 class="sBlockTitle">B</h2> </div> </div><div class="solutionBlock"> <div class="overlay"></div> <img src="http://via.placeholder.com/300" alt="C"> <div class="total-center front"> <h2 class="sBlockTitle">C</h2> </div> </div> </section>来自AnnotationConfigApplicationContext，其中有AbstractApplicationContext方法留空以进行覆盖

postProcessBeanFactory

要利用此功能，请创建/** * Modify the application context's internal bean factory after its standard * initialization. All bean definitions will have been loaded, but no beans * will have been instantiated yet. This allows for registering special * BeanPostProcessors etc in certain ApplicationContext implementations. * @param beanFactory the bean factory used by the application context */ protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) { }类，其类似于以下内容（针对AnnotationConfigApplicationContextProvider实例示例，您可以使用Vertx代替...）

MyClass

创建public class CustomAnnotationApplicationContextProvider { private final Vertx vertx; public CustomAnnotationApplicationContextProvider(Vertx vertx) { this.vertx = vertx; } /** * Register all beans to spring bean factory * * @param beanFactory, spring bean factory to register your instances */ private void configureBeans(ConfigurableListableBeanFactory beanFactory) { beanFactory.registerSingleton("vertx", vertx); } /** * Proxy method to create {@link AnnotationConfigApplicationContext} instance with no params * * @return {@link AnnotationConfigApplicationContext} instance */ public AnnotationConfigApplicationContext get() { return new AnnotationConfigApplicationContext() { @Override protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) { super.postProcessBeanFactory(beanFactory); configureBeans(beanFactory); } }; } /** * Proxy method to call {@link AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(DefaultListableBeanFactory)} with our logic * * @param beanFactory bean factory for spring * @return * @see AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(DefaultListableBeanFactory) */ public AnnotationConfigApplicationContext get(DefaultListableBeanFactory beanFactory) { return new AnnotationConfigApplicationContext(beanFactory) { @Override protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) { super.postProcessBeanFactory(beanFactory); configureBeans(beanFactory); } }; } /** * Proxy method to call {@link AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(Class[])} with our logic * * @param annotatedClasses, set of annotated classes for spring * @return * @see AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(Class[]) */ public AnnotationConfigApplicationContext get(Class<?>... annotatedClasses) { return new AnnotationConfigApplicationContext(annotatedClasses) { @Override protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) { super.postProcessBeanFactory(beanFactory); configureBeans(beanFactory); } }; } /** * proxy method to call {@link AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(String...)} with our logic * * @param basePackages set of base packages for spring * @return * @see AnnotationConfigApplicationContext#AnnotationConfigApplicationContext(String...) */ public AnnotationConfigApplicationContext get(String... basePackages) { return new AnnotationConfigApplicationContext(basePackages) { @Override protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) { super.postProcessBeanFactory(beanFactory); configureBeans(beanFactory); } }; } }时，您可以使用

创建它

ApplicationContext

Answer 5

首先初始化属性值

MutablePropertyValues mutablePropertyValues = new MutablePropertyValues();
mutablePropertyValues.add("hostName", details.getHostName());
mutablePropertyValues.add("port", details.getPort());

DefaultListableBeanFactory context = new DefaultListableBeanFactory();
GenericBeanDefinition connectionFactory = new GenericBeanDefinition();
connectionFactory.setBeanClass(Class);
connectionFactory.setPropertyValues(mutablePropertyValues);

context.registerBeanDefinition("beanName", connectionFactory);

添加到豆子列表中

ConfigurableListableBeanFactory beanFactory = ((ConfigurableApplicationContext) applicationContext).getBeanFactory();
beanFactory.registerSingleton("beanName", context.getBean("beanName"));

以编程方式将Bean添加到Spring Web App上下文

5 个答案: