Spring properties to map

朱雀 2022-05-20 05:42 151阅读 0赞

# Spring properties to map #

一个key-value形式的properties文件 以Map的形式注入到Spring的bean中

## properties文件形式 ##

RF09001=fooService#method1#name,phone

## spring 配置 ##

## 注入到Bean中 ##

@Resource(name="noMethodMap")
        private Map<String, String> noMethodMap;

## 其他 ##

### 如何定位注入源码 ###

修改为一个不存在的资源名称

@Resource(name="nonexist")

此时启动会报错

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'nonexist' available
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1207)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
        at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:522)

可知是在哪里注入的了

### 在哪里将PropertiesFactoryBean转成Map ###

同样的处理方式 将注入变量修改成一个错误的类型 查看错误信息即可

private String noMethodMap; // map --> String

启动会报错

Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'noMethodMap' is expected to be of type 'java.lang.String' but was actually of type 'java.util.Properties'
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:378)

就知道是在哪里进行类型转换的了

### 如果想对properties-->Map做一下自定义的处理呢 ###

如RF09001-RF09010对应的都是同一个value

RF09001-RF09003=fooService#method1#name,phone

但是想Map中的实际形式为

RF09001=fooService#method1#name,phone
    RF09002=fooService#method1#name,phone
    RF09003=fooService#method1#name,phone

继承`PropertiesFactoryBean` 覆盖`createProperties`即可

public class MyPropertiesFactoryBean extends PropertiesFactoryBean{
        @Override
        protected Properties createProperties() throws IOException {
            Properties properties = super.createProperties();
            Enumeration<String> propertyNames = (Enumeration<String>) properties.propertyNames();
            while(propertyNames.hasMoreElements()){
                String name = propertyNames.nextElement();
                if(name.matches("\\w+-\\w+")){
                    String rawName = name;
                    String[] split = rawName.split("-");
                    Integer start = Integer.valueOf(split[0].substring(2));
                    Integer end = Integer.valueOf(split[1].substring(2));
                    for (int i = start; i <= end; i++) {
                        properties.setProperty("RF" + i, properties.getProperty(rawName));
                    }
                }
            }
            return properties;
        }

spring配置改成

<bean id="noMethodMap" class="com.foo.app.util.MyPropertiesFactoryBean">