无法在Eclipse for Java的动态Web项目中加载属性文件

Question

I've put the properties file in Webcontent folder of my dynamic web project. But, it throws null pointer exception. Here is my code.

    ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
    InputStream input = classLoader.getResourceAsStream("Resources.properties");
    System.out.println(input);
    Properties properties = new Properties();       
    properties.load(input);     
    System.out.println("MySQL Driver :"+properties.getProperty("mysqlDriver"));

My properties file include

mysqlDriver = com.mysql.jdbc.Driver

I'm getting error at InputStream input = classLoader.getResourceAsStream("Resources.properties");

The error is

Feb 09, 2016 2:58:50 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [DatabaseAccess] in context with path  [/iNTU] threw exception
java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Unknown Source)
at java.util.Properties.load0(Unknown Source)

Answer 1

Put the "Resources.properties" file in the "src" folder of your dynamic web project (create it by right-clicking Jara Resources/src > new > general > File, named "MyResources.properties"). The code to read the properties file should then be updated to:

InputStream input = classLoader.getResourceAsStream("/Resources.properties");
//If you use a subfolder of src, please update accordingly.

With that, Eclipse will know how to deploy the compiled files to the war's WEB-INF/classes along with the properties file.