class path resource cannot be opened because it does not exits

矫情吗；* 2022-06-10 07:06 78阅读 0赞

E:\SoftwareTools\Java\jdk\bin\java ...
    八月 12, 2017 10:42:56 下午 org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
    信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@3f91beef: startup date [Sat Aug 12 22:42:56 CST 2017]; root of context hierarchy
    八月 12, 2017 10:42:57 下午 org.springframework.context.annotation.AnnotationConfigApplicationContext refresh
    警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.yubai.EL.ELConfig]; nested exception is java.io.FileNotFoundException: class path resource [com/yubai/EL/test.properties] cannot be opened because it does not exist
    Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.yubai.EL.ELConfig]; nested exception is java.io.FileNotFoundException: class path resource [com/yubai/EL/test.properties] cannot be opened because it does not exist
        at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181)
        at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308)
        at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228)
        at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:270)
        at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:93)
        at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525)
        at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:84)
        at com.yubai.EL.MainEl.main(MainEl.java:7)

![这里写图片描述][SouthEast]

## 分析思路 ##

在路劲com/yubai/EL下存在此文件，但错误信息输出如下：

> class path resource \[com/yubai/EL/test.properties\] cannot be opened because it does not exist

**从错误信息可以看出**  
1. com/yubai/EL/test.properties 这个文件不存在，但从图片中可以看出，此文件是存在的，可想而知，IDEA不是在此文件下查找的，所以test.properties不应该放在此目录下。  
2. 再查看错误信息，可以看出class path resource ，是在resource文件下查找的，在此resource文件夹下没有com/yubai/EL/test.properties，所以当我尝试在resource下创建此目录与文件后（com/yubai/EL/test.properties），再次执行就可以运行了

**代码块**

package com.yubai.EL;
    
    import org.apache.commons.io.IOUtils;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.PropertySource;
    import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
    import org.springframework.core.env.Environment;
    import org.springframework.core.io.Resource;
    
    
    @Configuration
    @PropertySource("classpath:com/yubai/EL/test.properties")
    public class ELConfig {
    
        @Value("classpath:com/yubai/EL/test.txt")
        private Resource testFile;
    
        @Value("${book.name}")
        private String bookName;
    
    
        @Bean
        public static PropertySourcesPlaceholderConfigurer propertyConfigurer(){
            return new PropertySourcesPlaceholderConfigurer();
        }
    
       public void output(){
            try{
                System.out.println(bookName);
                System.out.println(IOUtils.toString(testFile.getInputStream()));
            }catch (Exception e){
                e.printStackTrace();
            }
       }
    }

Main.java

package com.yubai.EL;
    
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    
    public class MainEl { 
        public static void main(String[] args) {
            AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ELConfig.class);
            ELConfig resource = context.getBean(ELConfig.class);
            resource.output();
            context.close();
        }
    }

![这里写图片描述][SouthEast 1]

[SouthEast]: /images/20220610/3a83b965830848dabdb9bb87388cefd2.png
[SouthEast 1]: /images/20220610/8aa8193ff91c4d8e86bcd8c344031003.png