解決Servlet中GET請求參數爲中文時出現亂碼

服務器：Tomcat 7.0.xx
在Servlet的doGet方法中添加以下代碼：

String str = request.getParameter("username");
byte[] bytes = str.getBytes("iso-8859-1");
str = new String(bytes, "utf-8");

例子：

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String str = request.getParameter("username");
        byte[] bytes = str.getBytes("iso-8859-1");
        str = new String(bytes, "utf-8");

        System.out.println(str);
    }

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當服務器：Tomcat 8.0.xx時，不需要輸入 以上代碼，可以直接輸出

例子：

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String str = request.getParameter("username");
        System.out.println(str);
    }