Failed to load resources: net:: ERR_CONNECTION_REFUSED
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>imooc办公OA系统</title>
<link rel="stylesheet" href="/resources/layui/css/layui.css">
<style>
body {
background-color: #f2f2f2;
}
.oa-container{
/*background-color: #FFF;*/
position: absolute;
width: 400px;
height: 350px;
top:50%;
left:50%;
padding:20px;
margin-left:-200px;
margin-top: -175px;
}
.oa-container .headline{
text-align: center;
margin-bottom: 20px;
}
#username,#password{
text-align: center;
font-size:24px;
}
</style>
</head>
<body>
<div class="oa-container">
<h1 class="headline">慕课网OA办公系统</h1>
<form class="layui-form">
<div class="layui-form-item">
<input class="layui-input" type="text" id="username" lay-verify="required" name="username"placeholder="请输入用户名" autocomplete="off">
</div>
<div class="layui-form-item">
<input class="layui-input" type="password" id="password" lay-verify="required" name="password"placeholder="请输入密码" autocomplete="off">
</div>
<div class="layui-form-item">
<button class="layui-btn layui-btn-fluid" lay-submit lay-filter="login">登录</button>
</div>
</form>
</div>
<script src="/resources/layui/layui.all.js"></script>
<script>
layui.form.on("submit(login)",function (data) { //data包含了当前表单的数据
console.log(data);
layui.$.ajax({
url : "/check_login",
data: data.field, //data.field包含当前页面的数据
type: "post",
dataType:"json",
success:function (json){
console.log(json)
if(json.code == "0"){
window.location.href = json.redirect_url;
}else {
layui.layer.msg(json.message);
}
}
})
return false; //subimit事件 if return true则会提交表单
})
</script>
</body>
</html>package com.imooc.oa.controller;
//接收了来自界面的用户输入，以及调用业务逻辑并且返回结果
import com.alibaba.fastjson.JSON;
import com.imooc.oa.entity.User;
import com.imooc.oa.service.UserService;
import com.imooc.oa.service.exception.BussinessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@WebServlet(name = "LoginServlet", value = "/check_login")
public class LoginServlet extends HttpServlet {
Logger logger = LoggerFactory.getLogger(LoginServlet.class);
private UserService userService = new UserService();
// 登录校验包含用户名和密码等敏感数据，所以需要通过Post请求来提交数据
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
Map<String,Object> result = new HashMap<>();
try {
//调用业务逻辑
User user = new UserService().checkLogin(username, password);
HttpSession session = request.getSession();
session.setAttribute("login_user",user);
result.put("code","0");
result.put("message", "success");
result.put("redirect_url", "/index");
}catch (BussinessException e) {
logger.error(e.getMessage(),e);
result.put("code",e.getCode());
result.put("message", e.getMessage());
}catch (Exception e) {
logger.error(e.getMessage(),e);
result.put("code",e.getClass().getSimpleName());
result.put("message", e.getMessage());
}
//return the result
String json = JSON.toJSONString(result);
response.getWriter().println(json);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
}问题描述：
之前没有这个问题，今天开机突然出现了
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2回答
同学你好，根据上传截图可知，代码报错信息为NoClassDefFoundError：无法初始化MybatisUtils类。
NoClassDefFoundError异常表示是在运行时JVM加载不到类或者找不到类。在初始化的时候，加载了配置文件mybatis-config.xml，那么很有可能是配置文件的问题，建议同学检查mybatis-config.xml以及dao对应的xml映射文件中是否有拼写等错误。
1）检查下mybatis-config.xml中的mapper文件名与项目中的文件名是否一致，若不一致则进行修改。例如：
2）再检查下mapper文件中是否存在同名的id
3）检查下parameterType中包名、类名是否正确
4）若不存在上述问题则建议将代码上传至问答区，老师测试后再给予解答。
祝学习愉快~
-
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>imooc办公OA系统</title> <link rel="stylesheet" href="/resources/layui/css/layui.css"> <style> body { background-color: #f2f2f2; } .oa-container{ /*background-color: #FFF;*/ position: absolute; width: 400px; height: 350px; top:50%; left:50%; padding:20px; margin-left:-200px; margin-top: -175px; } .oa-container .headline{ text-align: center; margin-bottom: 20px; } #username,#password{ text-align: center; font-size:24px; } </style> </head> <body> <div class="oa-container"> <h1 class="headline">慕课网OA办公系统</h1> <form class="layui-form"> <div class="layui-form-item"> <input class="layui-input" type="text" id="username" lay-verify="required" name="username"placeholder="请输入用户名" autocomplete="off"> </div> <div class="layui-form-item"> <input class="layui-input" type="password" id="password" lay-verify="required" name="password"placeholder="请输入密码" autocomplete="off"> </div> <div class="layui-form-item"> <button class="layui-btn layui-btn-fluid" lay-submit lay-filter="login">登录</button> </div> </form> </div> <script src="/resources/layui/layui.all.js"></script> <script> layui.form.on("submit(login)",function (data) { //data包含了当前表单的数据 console.log(data); layui.$.ajax({ url : "/check_login", data: data.field, //data.field包含当前页面的数据 type: "post", dataType:"json", success:function (json){ console.log(json) if(json.code == "0"){ window.location.href = json.redirect_url; }else { layui.layer.msg(json.message); } } }) return true; //subimit事件 if return true则会提交表单 }) </script> </body> </html>
2022-05-30 17:07:12
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