摘要：
案例代码-创建验证码 java @WebServlet("/checkCodeServlet") public class checkCodeServlet extends HttpServlet { protected void doPost(HttpServletRequest req, Htt 阅读全文
摘要：
使用步骤 protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // 1. 获取字节输出流 ServletOutputStream 阅读全文