package com.xxx
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
import org.springframework.web.context.ServletContextAware;
@Component
@Lazy(false)
public class PropertyHolder implements ServletContextAware
 
{
    private static ServletContext servletContext;
    private static String uploadDir;
    // 生成的js檔案存放目錄
    private static String jsGenerateDir;

    /**
    * 給上下文設定值
    */
    @Override
    public void setServletContext(ServletContext servletContext) {
        PropertyHolder.servletContext = servletContext;
        servletContext.setAttribute("ctx"
 
, servletContext.getContextPath());
        servletContext.setAttribute("uploadDir", uploadDir);
        //TODO 初始化任何值
    }

    //從配置檔案(/application.properties)給屬性賦值，其中upload.dir 配置檔案在專案根路徑，裡面定義了upload.dir才能賦值成功，否則初始化事值為null
    @Value("${upload.dir}")
    public void setUploadDir(String uploadDir) {
        PropertyHolder.uploadDir = uploadDir;
    }
    //TODO 從配置檔案初始化任何屬性
 

    //It's so easy! let's get it;
}