如何在Spring覆盖PropertiesFactoryBean？

Question

我想重写java中的getProperty（）方法。util。物业类别，请告知。

1.Spring上下文文件

spring-context.xml

    <bean id="myproperty" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
            <property name="locations" value="classpath:myproperties.properties" />

</bean> 

2.Java类

public class MyClass{

      @Autowired
        public void setMyproperty(Properties myproperty) {
             this.url=myproperty.getProperty("url");
         }

    }

3.配置文件

myproperties.properties
url=http://stackoverflow.com

仅供参考：我正在从配置文件中提取批次值，并希望在从中获取值后调用trim（）。属性，以避免代码冗余，尝试重写getProperty（）方法。

使用：Spring 4.0

Answer 1

扩展spring默认属性占位符（PropertyPlaceHolderConfigure）并捕获它在局部变量中加载的属性。

public class PropertiesUtils extends PropertyPlaceholderConfigurer {

    private static Map<String, String> propertiesMap;
    private int springSystemPropertiesMode = SYSTEM_PROPERTIES_MODE_FALLBACK;

    @Override
    public void setSystemPropertiesMode(int systemPropertiesMode) {
        super.setSystemPropertiesMode(systemPropertiesMode);
        springSystemPropertiesMode = systemPropertiesMode;
    }

    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactory, Properties props) throws BeansException {
        super.processProperties(beanFactory, props);

        propertiesMap = new HashMap<String, String>();
        for (Object key : props.keySet()) {
            String keyStr = key.toString();
            String valueStr = resolvePlaceholder(keyStr, props, springSystemPropertiesMode);
            propertiesMap.put(keyStr, valueStr);
        }
    }

    public static String getProperty(String name) {
        return propertiesMap.get(name).toString();
    }