关于Spring properties --> Map 注入到bean中

2024年1月20日 286次阅读 来源: zhuguowei2

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

    <bean id="noMethodMap" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="location" value="classpath:foo.properties"/>
    </bean>

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">
    原文作者：zhuguowei2
    原文地址: https://segmentfault.com/a/1190000008997766
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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