使用ajax实现验证码

2021-02-12 02:16

阅读：461

标签：head ssi cep extends gets let ltm else password

java后台的servlet：

 1 @WebServlet(value = "/login.love",name = "AjaxLoginServlet")
 2 public class AjaxLoginServlet extends HttpServlet {
 3 
 4     @Override
 5     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 6         super.doPost(req, resp);
 7     }
 8 
 9     @Override
10     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
11 
12         ResultMsg rm=new ResultMsg();
13         PrintWriter out=resp.getWriter();
14         Gson gson=new Gson();
15 
16         //1 获取前台来的验证码
17         //2 获取session里面的验证码
18         //3 校验
19 
20         String vcode=req.getParameter("vcode");
21         String code= (String) req.getSession().getAttribute("code");
22 
23         if (null==vcode||null==code){
24             rm.setResult("0002");
25             rm.getMsg("验证码为空");
26 
27             out.println(gson.toJson(rm));
28             return;
29         }
30         if (vcode.equalsIgnoreCase(code)){
31             rm.setResult("0000");
32             out.println(gson.toJson(rm));
33         }else {
34             rm.setResult("0001");
35             rm.getMsg("验证码错误");
36             out.println(gson.toJson(rm));
37         }
38 
39 
40     }