spring 容器的功能扩展4.postProcessBeanFactory

最新推荐文章于 2024-08-26 10:56:40 发布

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最新推荐文章于 2024-08-26 10:56:40 发布

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本文介绍如何使用Spring框架的BeanFactoryPostProcessor接口进行bean定义的后处理操作，通过示例展示了如何创建一个ObscenityRemovingBeanFactoryPostProcessor来过滤配置文件中的敏感词汇。

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这个功能在abstractApplicationContext中并没有实现，故意留给子类去实现：

BeanFactoryPostProcessor和BeanPostProcessor很相似，只是层级不同，BeanFactoryPostProcessor 是容器级别的后处理器，对其他容器中的bean 没有影响：

这里做一个示例：

屏蔽关键字：

/**
 * @author no
 * @create 2018-12-21 21:48
 * @desc 屏蔽敏感词
 **/
public class ObscenityRemovingBeanFactoryPostProcessor implements BeanFactoryPostProcessor {

    private Set<String> obscenties;


    public ObscenityRemovingBeanFactoryPostProcessor() {
        obscenties = new HashSet<>();
    }

    public ObscenityRemovingBeanFactoryPostProcessor(Set<String> obscenties) {
        this.obscenties = obscenties;
    }



    public void setObscenties(Set<String> obscenties){
        this.obscenties.clear();
        obscenties.forEach(s->{
            this.obscenties.add(s.toUpperCase());
        });
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        String[] ss = beanFactory.getBeanDefinitionNames();
        for(String name:ss){
            BeanDefinition bd = beanFactory.getBeanDefinition(name);
            StringValueResolver valueResolver = new StringValueResolver() {
                @Override
                public String resolveStringValue(String s) {
                    System.out.println(s);
                    if(isObscene(s)) return "*******";
                    return s;
                }
            };
            BeanDefinitionVisitor visitor = new BeanDefinitionVisitor(valueResolver);
            visitor.visitBeanDefinition(bd);
        }
    }

    private boolean isObscene(Object s){
        return this.obscenties.contains(s.toString().toUpperCase());
    }
}

    <bean id="bfpp" class="com.spring.bean.PostProcessor.ObscenityRemovingBeanFactoryPostProcessor">
        <property name="obscenties">
            <set>
                <value>abc</value>
                <value>你好</value>
                <value>我</value>
            </set>
        </property>
    </bean>

    <bean id="simpleBean" class="com.spring.bean.PostProcessor.SimplePostProcessor">
        <property name="username" value="abc"/>
        <property name="contry" value="你好"/>
        <property name="password" value="123456"/>
    </bean>

测试用例：

    @Test
    public void contextLoads() {
        ConfigurableListableBeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("/application-bean.xml"));
        BeanFactoryPostProcessor bfpp =  (BeanFactoryPostProcessor)beanFactory.getBean("bfpp");
        bfpp.postProcessBeanFactory(beanFactory);
        System.out.println(beanFactory.getBean("simpleBean"));
    }


print:
SimplePostProcessor(username=*******, password=123456, contry=*******)