//檔案目錄與JsonToJava.class處於同級目錄
Reader reader = new InputStreamReader(JsonToJava.class.getResourceAsStream("js/Server2.json"), "UTF-8");

//檔案目錄與JsonToJava.class處於不同級目錄，JsonToJava.class的檔案目錄層級比/js/Server2.json所在的目錄更深一層
Reader reader = new InputStreamReader(JsonToJava.class.getResourceAsStream("../js/Server2.json"), "UTF-8");


//不考慮資源目錄與類的目錄層級
InputStream in = new FileInputStream(System.getProperty("user.dir")+"/cfg/js/Server1.json");
Reader reader = new InputStreamReader(in, "UTF-8");