验证码和异步刷新

异步刷新： controller

@PostMapping("/yibu") @ResponseBody public String yibu(String username){ JSONObject jsonObject = new JSONObject(); User user = userService.findByUsername(username); if (username!=null){ if (user!=null){ jsonObject.put("result","用户存在"); }else { jsonObject.put("result","用户不存在"); } } return jsonObject.toString(); } 页面： function a1() { var username = $("#username").val(); // alert(username) $.ajax({ url:"/yibu", type: "post", dataType: "json", data: { username:username }, success:function (data) { if (data.result == "用户存在"){ $("#tip").css("color","blue"); }else { $("#tip").css("color","red"); } $("#tip").html(data.result); }, error:function () { alert(1) } }) }

验证码： 页面：

var verify = new GVerify("yzm"); $(function () { $("#dlbutton").on("click", function () { var username = $("input[name='username']").val(); var password = $("input[name='password']").val(); var code = $("input[name='captcha']").val(); if (username == "") { alert("用户名不能为空"); return; } if (password == "") { alert("密码不能为空"); return; } if (code == "") { alert("验证码不能为空"); return; } if (!verify.validate(code)) { alert("验证码错误") return; }else { $.ajax({ url:"/doLogin", type:"post", dataType:"json", data:{ username:username, password:password }, success:function (data) { if (data.result == "0"){ window.location.href = "/"; }else if (data.result == "1"){ alert("密码错误") window.location.href = "/login"; }else { alert("用户不存在") window.location.href = "/login"; } } }) } }) })

controller：

@PostMapping("/doLogin") @ResponseBody public String doLogin(HttpSession session, @RequestParam("username") String username, @RequestParam("password") String password){ User user = userService.findByUsername(username); JSONObject jsonObject = new JSONObject(); if (user!=null){ if (user.getPassword().equals(password)){ jsonObject.put("result","0"); session.setAttribute("user",user); return jsonObject.toString(); } jsonObject.put("result","1"); return jsonObject.toString(); } jsonObject.put("result","2"); return jsonObject.toString(); }