Java JFrame 應用筆記

1、exej4編譯，Icon窗口圖標不顯示

修改前

Toolkit toolKit = getToolkit();
Image icon = getToolkit().getImage("./src/img/logo.png");
this.setIconImage(icon);

修改後

URL url = getClass().getResource("/img/logo.png");
Image img = Toolkit.getDefaultToolkit().getImage(url);
this.setIconImage(img);

2、ini配置文件亂碼（（漢字字符流讀取和寫入並指定編碼格式）直接編輯ini與代碼賦值）

//讀文件
InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "GBK");
BufferedReader bufferedReader = new BufferedReader(isr);
//寫入文件
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), "GBK"));