注册时 跳转到注册页面就出现400报错

尝试过的解决方式：

1.清除缓存

2.重构项目

3.检查所有的username属性是否有拼写错误

4.根据其他回答重写controller里的注册代码，将密码检验分离到jsp页面中

无论咋改 还是报这个400错误 烦请老师帮忙看一下有什么问题

可能是我自己有没检查到的地方

User.java：

package com.imooc.bbs.entity;

public class User {
    private int id;
    private String username;
    private String password;
    private String email;
    //注册时状态的值为0，表示正常账户。当后台进行锁定操作时，该状态变为1。在进行删除时，该状态变为2。
    private int userStatus;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public int getUserStatus() {
        return userStatus;
    }

    public void setUserStatus(int userStatus) {
        this.userStatus = userStatus;
    }
}

UserDao.java：

package com.imooc.bbs.dao;

import com.imooc.bbs.entity.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;
@Repository("userDao")
public interface UserDao {
    void insert(User user);
    void update(User user);
    void delete(int id);
    User selectById(int id);
    User selectByName(String username);
    List<User> selectAll();
}

GlobalBiz.java：

package com.imooc.bbs.biz;

import com.imooc.bbs.entity.User;

public interface GlobalBiz {
    User login(String username, String password);
    void register(User user);
}

GlobalBizImpl.java：

package com.imooc.bbs.biz.impl;

import com.imooc.bbs.biz.GlobalBiz;
import com.imooc.bbs.dao.UserDao;
import com.imooc.bbs.entity.User;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service("globalBiz")
public class GlobalBizImpl implements GlobalBiz {
    @Autowired(required = false)
    private UserDao userDao;

    public User login(String username,String password) {
        User user = userDao.selectByName(username);
        if (user != null && user.getPassword().equals(password)) {
            return user;
        }
        return null;
    }

    public void register(User user) {
        userDao.insert(user);
    }
}

GlobalController.java：

package com.imooc.bbs.controller;

import com.imooc.bbs.biz.GlobalBiz;
import com.imooc.bbs.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpSession;
import java.util.Map;

@Controller("globalController")
public class GlobalController {
    @Autowired
    private GlobalBiz globalBiz;

    @RequestMapping("/to_login")
    public String toLogin() {
        return "/login";
    }
    @RequestMapping("/login")
    public String login(HttpSession session, @RequestParam String username, @RequestParam String password) {
        User user = globalBiz.login(username, password);
        if (user == null) {
            return "redirect:to_register";
        }
        session.setAttribute("user", user);
        return "list";
    }

    @RequestMapping("/to_register")
    public String toRegister(){
        return "register";
    }

    @RequestMapping("/register")
    public String register(User user,@RequestParam String username,@RequestParam String password,@RequestParam String email){
        user.setUsername(username);
        user.setPassword(password);
        user.setEmail(email);
        user.setUserStatus(0);
        globalBiz.register(user);
        return "redirect:to_login";
    }
}

register.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>慕课论坛</title>
    <link rel="stylesheet" href="../../static/css/all-df86af5803.css">
        <script type="text/javascript">
            function validate_form() {
                var password =document.getElementsByName("password").value;
                var password2=document.getElementsByName("password_confirm").value;
                if(password!=password2){
                    alert("两次密码不一致");
                    return false;
                }
                return true;
            }
        </script>
</head>
<body class="forum" data-page="forum">
<div class="header">
    <nav class="navbar navbar-inverse navbar-fixed-top navbar-default">
        <div class="container">
            <div class="navbar-header" id="navbar-header">
                <a href="index.html" class="navbar-brand"><img src="../../images/logo.png">
                </a>
            </div>
            <div id="main-nav-menu">
                <ul class="nav navbar-nav">
                    <li ><a href="list.jsp"><i class="fa fa-home"></i> <span class="hidden-xs hidden-sm">首页</span></a></li>
                    <li class="hidden-sm hidden-xs"><a href="thread.jsp"><i class="fa fa-comments-o"></i> 话题</a></li>

                </ul>
            </div>

            <ul class="nav navbar-nav navbar-right">
                <li class="nav-search hidden-xs hidden-sm">
                    <form method="GET" action="###/auth/register" accept-charset="UTF-8" class="navbar-form form-search active" target="_blank">
                        <div class="form-group">
                            <input placeholder="搜索" class="form-control" name="q" type="search">
                        </div>
                        <i class="fa fa-search"></i>
                    </form>
                </li>
                <li class="active"><a href="register.jsp" id="signup-btn">注册</a></li>
                <li ><a href="login.jsp" id="login-btn">登录</a></li>
            </ul>
        </div>
    </nav>
</div>    <div id="main" class="main-container container">


    <div class="container-fluid">
        <div class="row">
            <div class="col-md-6 col-md-offset-3">
                <div class="panel panel-default">
                    <div class="panel-heading">注册</div>
                    <div class="panel-body">
                        <form role="form" method="POST" action="register" onsubmit="return validate_form()">

                            <div class="form-group">
                                <input type="text" class="form-control" name="username" id="username" placeholder="用户名">
                            </div>
                            <div class="form-group">
                                <input type="text" class="form-control" name="email" id="email" placeholder="邮箱地址">
                            </div>
                            <div class="form-group">
                                <input type="password" class="form-control" name="password" id="password" placeholder="密码">
                            </div>
                            <div class="form-group">
                                <input type="password" class="form-control" name="password_confirm" placeholder="确认密码">
                            </div>

                            <button type="submit" class="btn btn-primary">
                                注册
                            </button>
                            <a href="" class="btn btn-default">取消</a>
                        </form>
                    </div>
                </div>
                <div class="panel-footer">
                    已注册或使用社交账号登录，请点击 <a href="login.jsp">这里</a> 进行登录。
                </div>
            </div>
        </div>
    </div>
</div>

</div>

<footer class="footer">
    <div class="container">
        <div class="copyright">
            <blockquote class="pull-left">
                <p>慕课论坛</p>
                <p>Copyright &copy; 2015-2016 <a href="list.jsp">imooc</a>  1.0.0-rc2 <span class="pipe">|</span><span class="pipe">|</span></p>
            </blockquote>
        </div>
        <div class="pull-right hidden-sm hidden-xs">
            <p>
                <a href="###">关于我们</a>
                <span class="pipe">|</span>
                <a href="###">联系我们</a>
                <span class="pipe">|</span>
                <a href="###">常见问题解答</a>
            </p>
            <p>
                <a href="list.jsp" target="_blank"><img src="../../images/imooc-logo.png" border="0" height="40" data-toggle="tooltip" data-placement="top" title="Powered by imooc" /></a>
            </p>
        </div>
    </div>
</footer>
</body>
</html>

login.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>慕课论坛</title>
    <link rel="stylesheet" href="../../static/css/all-df86af5803.css">
</head>
<body class="forum" data-page="forum">
<div class="header">
    <nav class="navbar navbar-inverse navbar-fixed-top navbar-default">
        <div class="container">
            <div class="navbar-header" id="navbar-header">
                <a href="list.jsp" class="navbar-brand"><img src="../../images/logo.png">
                </a>
            </div>
            <div id="main-nav-menu">
                <ul class="nav navbar-nav">
                    <li ><a href="list.jsp"><i class="fa fa-home"></i> <span class="hidden-xs hidden-sm">首页</span></a></li>
                    <li class="hidden-sm hidden-xs"><a href="thread.jsp"><i class="fa fa-comments-o"></i> 话题</a></li>

                </ul>
            </div>

            <ul class="nav navbar-nav navbar-right">
                <li class="nav-search hidden-xs hidden-sm">
                    <form method="GET" action="/bbs/preLogin.do" accept-charset="UTF-8" class="navbar-form form-search active" target="_blank">
                        <div class="form-group">
                            <input placeholder="搜索" class="form-control" name="q" type="search">
                        </div>
                        <i class="fa fa-search"></i>
                    </form>
                </li>
                <li ><a href="register.jsp" id="signup-btn">注册</a></li>
                <li class="active"><a href="login.jsp" id="login-btn">登录</a></li>
            </ul>
        </div>
    </nav>
</div>    <div id="main" class="main-container container">


    <div class="container-fluid">
        <div class="row">
            <div class="col-md-5 col-md-offset-2">
                <div class="panel panel-default">
                    <div class="panel-heading">登录</div>
                    <div class="panel-body">
                        <form role="form" method="POST" action="login">

                            <div class="form-group">
                                <input type="login" class="form-control" name="username" value="" placeholder="用户名">
                            </div>

                            <div class="form-group">
                                <input type="password" class="form-control" name="password" placeholder="密码">
                            </div>
                            <div class="form-group">
                                <input type="submit" name="commit" value="登录" class="btn btn-primary btn-lg btn-block">
                            </div>
                        </form>
                    </div>
                    <div class="panel-footer">
                        <a href="/register.jsp">注册</a>

                    </div>
                </div>
            </div>
            <div class="col-md-3">
                <div class="panel panel-default">
                    <div class="panel-heading">用其他平台的帐号登录</div>
                    <ul class="list-group">
                        <li class="list-group-item">
                            <a href="###" class="btn btn-default btn-lg btn-block"><i class="fa fa-github"></i> Github</a>
                        </li>
                    </ul>
                </div>
            </div>
        </div>
    </div>

</div>

<footer class="footer">
    <div class="container">
        <div class="copyright">
            <blockquote class="pull-left">
                <p>慕课论坛</p>
                <p>Copyright &copy; 2015-2016 <a href="list.jsp">imooc</a>  1.0.0-rc2 <span class="pipe">|</span><span class="pipe">|</span></p>
            </blockquote>
        </div>
        <div class="pull-right hidden-sm hidden-xs">
            <p>
                <a href="###">关于我们</a>
                <span class="pipe">|</span>
                <a href="###">联系我们</a>
                <span class="pipe">|</span>
                <a href="###">常见问题解答</a>
            </p>
            <p>
                <a href="list.jsp" target="_blank"><img src="../../images/imooc-logo.png" border="0" height="40" data-toggle="tooltip" data-placement="top" title="Powered by imooc" /></a>
            </p>
        </div>
    </div>
</footer>
</body>
</html>

list.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <title>慕课论坛</title>
    <link rel="stylesheet" href="../../static/css/all-df86af5803.css">

</head>
<body class="forum" data-page="forum">
<div class="header">
    <nav class="navbar navbar-inverse navbar-fixed-top navbar-default">
        <div class="container">
            <div class="navbar-header" id="navbar-header">
                <a href="/bbs/list.do" class="navbar-brand"><img src="../../images/logo.png">
                </a>
            </div>
            <div id="main-nav-menu">
                <ul class="nav navbar-nav">
                    <li class="active"><a href=""><i class="fa fa-home"></i> <span
                            class="hidden-xs hidden-sm">首页</span></a></li>
                    <li class="hidden-sm hidden-xs"><a href="thread.html"><i class="fa fa-comments-o"></i> 话题</a></li>

                </ul>
            </div>

            <ul class="nav navbar-nav navbar-right">
                <li class="nav-search hidden-xs hidden-sm">
                    <form method="GET" action="###" accept-charset="UTF-8"
                          class="navbar-form form-search active" target="_blank">
                        <div class="form-group">
                            <input placeholder="搜索" class="form-control" name="q" type="search">
                        </div>
                        <i class="fa fa-search"></i>
                    </form>
                </li>

                <!-- 登录成功要显示的内容 -->
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
                        imooc1  <!-- 此处显示用户名 -->

                        <span class="caret"></span></a>
                    <button class="navbar-toggle" type="button" data-toggle="dropdown" role="button" aria-expanded="false">
                        <span class="sr-only">Toggle</span>
                        <i class="fa fa-reorder"></i>
                    </button>
                    <ul class="dropdown-menu" role="menu"><li class=""><a href="my.html">我的主页</a></li>
                        <li><div class='divider'></div></li>
                        <li><a href="my.html">个人设置</a></li>

                        <li><a href="score.html">我的积分</a></li>
                        <li class='divider'></li>
                        <li><a href="###" onclick=" return confirm('你确定要退出吗?')"><i class="fa fa-sign-out"></i> 退出
                        </a></li>
                    </ul>
                </li>
                <!-- 未登录显示的内容 -->
                <li><a href="/bbs/preReg.do" id="signup-btn">注册</a></li>
                <li><a href="/bbs/preLogin.do" id="login-btn">登录</a></li>


            </ul>
        </div>
    </nav>
</div>
<div id="main" class="main-container container">
    <!-- 首页通栏(4个推荐位) -->
    <div class="col-md-9 threads-index main-col">
        <div class="panel panel-default">

            <div class="panel-heading">
                <div class="pull-left hidden-sm hidden-xs">
                    <i class="fa fa-list"></i> 首页
                </div>
                <ul class="pull-right list-inline remove-margin-bottom thread-filter">
                    <li>
                        <a href="thread.html">
                            <i class="fa fa-history"></i> 最新话题
                        </a>
                    </li>
                    <li>
                        <a href="thread.html">
                            <i class="fa fa-diamond"> </i> 优质帖子
                        </a>
                    </li>
                    <li>
                        <a href="thread.html">
                            <i class="fa fa-thumbs-o-up"> </i> 最多按赞
                        </a>
                    </li>
                    <li>
                        <a href="thread.html">
                            <i class="fa fa-eye"></i> 等待回复
                        </a>
                    </li>
                </ul>
                <div class="clearfix"></div>
            </div>


            <div class="panel-body remove-padding-horizontal">
                <ul class="list-group row thread-list">
                    <!-- 显示帖子，每个li显示一个帖子的内容 -->
                    <li class="list-group-item media " style="margin-top: 0px;">
                        <a class="pull-right" href="post.html"><span class="badge badge-reply-count"> 25 </span>
                        </a>
                        <div class="avatar pull-left">
                            <a href="post.html">
                                <img class="media-object img-thumbnail avatar-48" alt="imooc" src="../../images/avatar.jpg"/>
                            </a>
                        </div>
                        <div class="infos">
                            <div class="media-heading">
                                <i class="fa fa-thumb-tack text-danger"></i>
<%--                                <a href="/bbs/getPost.do?id=<%=post.getId()%>" title="<!-- 此处存放帖子标题的内容 -->">--%>
                                    帖子标题   <!-- 此处显示帖子标题 -->
                                </a>
                            </div>
                            <div class="media-body meta">
                                <a href="post.html">
                                    <span class="fa fa-thumbs-o-up"> 10 </span>
                                </a>
                                <span> • </span>
                                <span>回复</span>
                                <a href="post.html">
                                    用户名
                                </a>
                                <span> • </span>
                                <span class="timeago " data-toggle="tooltip" data-placement="top"
                                      title="2017-02-08 21:47:25">2017-02-08 21:47:25</span>
                            </div>
                        </div>
                    </li>



                </ul>
            </div>

            <div class="panel-footer text-right remove-padding-horizontal pager-footer">
                <!-- Pager -->
                <!-- 如有需要可以在此处添加分页，本次作业不要求完成 -->
                <ul class="pagination">

                    <li> <a href=""><span></span></a></li>

                </ul>
            </div>


        </div>
    </div>

    <div class="col-md-3 side-bar">
        <div class="panel panel-default corner-radius">
            <div class="panel-heading">
                <h3 class="panel-title">BBS</h3>
            </div>

            <!-- 登录后显示的内容 -->
            <div class="panel-body text-center">
                <a href="" class="btn btn-primary">
                    <i class="fa fa-user"> </i> 发帖
                </a>
            </div>
            <!-- 未登录显示的内容 -->
            <div class="panel-body text-center">
                <a href="" class="btn btn-primary">
                    <i class="fa fa-user"> </i> 注册
                </a>
            </div>
            <div class="panel-footer text-center">
                已注册用户请 <a href="">登录</a>
            </div>


        </div>

        <div class="panel panel-default corner-radius">
            <div class="panel-heading">
                <h3 class="panel-title">热门标签</h3>
            </div>
            <div class="panel-body">
                <div class="badge badge-tag-cloud">
                    <a href="">Java</a> &nbsp;&nbsp; <a href="">Python</a>
                </div>
            </div>
        </div>
        <div class="panel panel-default corner-radius">
            <div class="panel-heading">
                <h3 class="panel-title">小贴士</h3>
            </div>
            <div class="panel-body">
                猪有猪的思想，人有人的思想。如果猪有人的思想，那它就不是猪了——是八戒!
            </div>
        </div>

        <div class="panel panel-default corner-radius">
            <div class="panel-heading">
                <h3 class="panel-title">统计信息</h3>
            </div>
            <ul class="list-group">
                <li class="list-group-item">社区会员: 747</li>
                <li class="list-group-item">主题数: 95</li>
                <li class="list-group-item">回帖数: 218</li>
            </ul>
        </div>


    </div>
    <div class="clearfix"></div>

</div>

<footer class="footer">
    <div class="container">
        <div class="copyright">
            <blockquote class="pull-left">
                <p>慕课论坛</p>
                <p>Copyright &copy; 2015-2016 <a href="index.html">imooc</a> 1.0.0-rc2 <span class="pipe">|</span><span class="pipe">|</span></p>
            </blockquote>
        </div>
        <div class="pull-right hidden-sm hidden-xs">
            <p>
                <a href="###">关于我们</a>
                <span class="pipe">|</span>
                <a href="###">联系我们</a>
                <span class="pipe">|</span>
                <a href="###">常见问题解答</a>
            </p>
            <p>
                <a href="index.html" target="_blank"><img src="../../images/imooc-logo.png" border="0" height="40"
                                                          data-toggle="tooltip" data-placement="top"
                                                          title="Powered by imooc"/></a>
            </p>
        </div>
    </div>
</footer>
</body>
</html>