解决Servlet中GET请求参数为中文时出现乱码

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);
    }

当服务器：Tomcat 8.0.xx时，不需要输入 以上代码，可以直接输出

例子：

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

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

解决Servlet中GET请求参数为中文时出现乱码

原文：https://blog.51cto.com/indigotang/2413540