Java项目:无法访问资源目录中的属性文件

Question

我正在构建一个jersey-2网络应用程序。我无法从资源访问config.property文件。我遗漏了什么？

@Bean(name = com.tarkshala.photo.drive.Configuration.CONFIGURATION_BEAN_NAME)
public Properties getConfiguration() throws IOException {
    Properties properties = new Properties();
    InputStream input = new FileInputStream("config.properties");
    properties.load(input);
    return properties;
}

​

​

Bean初始化失败，错误如下：

Caused by: java.lang.NullPointerException
    at com.tarkshala.photo.spring.SpringAppConfig.getConfiguration(SpringAppConfig.java:47)
    at com.tarkshala.photo.spring.SpringAppConfig$$EnhancerBySpringCGLIB$$3ecfb6f6.CGLIB$getConfiguration$5(<generated>)
    at com.tarkshala.photo.spring.SpringAppConfig$$EnhancerBySpringCGLIB$$3ecfb6f6$$FastClassBySpringCGLIB$$45328ae1.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358)

Answer 1

你可以试试YourCurrentClass.class.getClassLoader().getResourceAsStream("config.properties")

Answer 2

主要区别在于，在ClassLoader实例上使用getResourceAsStream时，从类路径的根开始将路径视为绝对路径。reading-file-in-java

public InputStream getResourceFileAsInputStream(String fileName) {
    ClassLoader classloader = SpringAppConfig.class.getClassLoader();
    return classloader.getResourceAsStream(fileName);   
}

public Properties getConfiguration() throws IOException {
    Properties properties = new Properties();
    InputStream input = getResourceFileAsInputStream("config.properties");
    properties.load(input);

    return properties;
} 

java-properties-file-examples