Javascript 我不能'；t建立数据库连接，它将显示错误

我收到一个错误，说Http error 500 internal server error，我创建了一个这样的表

CREATE TABLE `EMPLOYEE` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `FIRST_NAME` varchar(45) NOT NULL,
  `LAST_NAME` varchar(45) NOT NULL,
  `EMAIL` varchar(45) NOT NULL,
  `USER_NAME` varchar(45) NOT NULL,
  `PASSWORD` varchar(45) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

除了我用小写字母输入了

员工

表名

该程序位于动态web项目下面的链接中！ [

是因为我没打这行吗

代码

    <%@page import="java.sql.Statement"%>
    <%@page import="java.sql.Connection"%>
    <%@page import="com.example.util.DBUtil"%>
    <%
        String userName = request.getParameter("username");
        String password = request.getParameter("password");
        String firstName = request.getParameter("firstname");
        String lastName = request.getParameter("lastname");
        String email = request.getParameter("email");
        Connection con = DBUtil.getMySqlConnection();
        Statement st = con.createStatement();
        //ResultSet rs;
        int i = st
                .executeUpdate("insert into EMPLOYEE(FIRST_NAME, LAST_NAME, EMAIL, USER_NAME, PASSWORD) values ('"
                        + firstName
                        + "','"
                        + lastName
                        + "','"
                        + email
                        + "','" 
                        + userName
                        + "','" 
                        + password 
                        + "')");
        if (i > 0) {
            response.sendRedirect("welcome.jsp");
        } else {
            response.sendRedirect("index.jsp");
        }
    %>






**THE ERROR I GET**


org.apache.jasper.JasperException: An exception occurred processing [/registration.jsp] at line [10]

7:  String firstName = request.getParameter("firstname");enter code here
8:  String lastName = request.getParameter("lastname");
9:  String email = request.getParameter("email");
10:     Connection con = DBUtil.getMySqlConnection();
11:     Statement st = con.createStatement();
12:     //ResultSet rs;
13:     int i = st


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:618)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:500)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Root Cause 
javax.servlet.ServletException: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:917)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:846)
    org.apache.jsp.registration_jsp._jspService(registration_jsp.java:126)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Root Cause 

    com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client
        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        java.lang.reflect.Constructor.newInstance(Unknown Source)
        com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        com.mysql.jdbc.Util.getInstance(Util.java:384)
        com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
        com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3566)
        com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3498)
        com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:919)
        com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4004)
        com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1284)
        com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2312)
        com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2122)
        com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:774)
        com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        java.lang.reflect.Constructor.newInstance(Unknown Source)
        com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:375)
        com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:289)
        java.sql.DriverManager.getConnection(Unknown Source)
        java.sql.DriverManager.getConnection(Unknown Source)
        com.example.util.DBUtil.getMySqlConnection(DBUtil.java:10)
        org.apache.jsp.registration_jsp._jspService(registration_jsp.java:94)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Note The full stack trace of the root cause is available in the server logs.


  [1]: http://www.javawebtutor.com/code/jsp/LoginExample.zip
  [2]: https://i.stack.imgur.com/XcLfl.png

0) {
sendRedirect（“welcome.jsp”）；
}否则{
sendRedirect（“index.jsp”）；
}
%>
**我得到的错误**
org.apache.jasper.jaspereException:在第[10]行处理[/registration.jsp]时发生异常
7:String firstName=request.getParameter（“firstName”）；在此处输入代码
8:String lastName=request.getParameter（“lastName”）；
9:String email=request.getParameter（“email”）；
10:Connection con=DBUtil.getMySqlConnection（）；
11:Statement st=con.createStatement（）；
12://结果集rs；
13:int i=st
堆栈跟踪：
org.apache.jasper.servlet.JspServletWrapper.handleJspException（JspServletWrapper.java:618）
org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:500）
org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:395）
org.apache.jasper.servlet.JspServlet.service（JspServlet.java:339）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
根本原因
JavaX.Servel.ServLeExelt：COM.myqq.jdccExvuts.jdc4.myqLoNunTriment连接异常：客户端不支持服务器请求的身份验证协议；考虑升级MySQL客户端
org.apache.jasper.runtime.PageContextImpl.doHandlePageException（PageContextImpl.java:917）
org.apache.jasper.runtime.PageContextImpl.handlePageException（PageContextImpl.java:846）
org.apache.jsp.registration\u jsp.\u jsp服务（registration\u jsp.java:126）
org.apache.jasper.runtime.HttpJspBase.service（HttpJspBase.java:70）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:477）
org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:395）
org.apache.jasper.servlet.JspServlet.service（JspServlet.java:339）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
根本原因
Client mysq.jdccExv.jdc4.myqLunNoTrimeCnnutoClient异常：客户端不支持服务器请求的身份验证协议；考虑升级MySQL客户端
sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）
sun.reflect.NativeConstructorAccessorImpl.newInstance（未知源）
sun.reflect.DelegatingConstructorAccessorImpl.newInstance（未知源）
java.lang.reflect.Constructor.newInstance（未知源）
com.mysql.jdbc.Util.handleNewInstance（Util.java:409）
com.mysql.jdbc.Util.getInstance（Util.java:384）
com.mysql.jdbc.SQLError.createSQLException（SQLError.java:1015）
com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:3566）
com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:3498）
com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:919）
com.mysql.jdbc.MysqlIO.secureAuth411（MysqlIO.java:4004）
com.mysql.jdbc.MysqlIO.doHandshake（MysqlIO.java:1284）
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly（ConnectionImpl.java:2312）
com.mysql.jdbc.ConnectionImpl.createNewIO（ConnectionImpl.java:2122）
com.mysql.jdbc.ConnectionImpl.（ConnectionImpl.java:774）
JDBC4Connection（JDBC4Connection.java:49）
sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）
sun.reflect.NativeConstructorAccessorImpl.newInstance（未知源）
sun.reflect.DelegatingConstructorAccessorImpl.newInstance（未知源）
java.lang.reflect.Constructor.newInstance（未知源）
com.mysql.jdbc.Util.handleNewInstance（Util.java:409）
com.mysql.jdbc.ConnectionImpl.getInstance（ConnectionImpl.java:375）
com.mysql.jdbc.NonRegisteringDriver.connect（NonRegisteringDriver.java:289）
java.sql.DriverManager.getConnection（未知源）
java.sql.DriverManager.getConnection（未知源）
getMySqlConnection（DBUtil.java:10）
org.apache.jsp.registration\u jsp.\u jsp服务（registration\u jsp.java:94）
org.apache.jasper.runtime.HttpJspBase.service（HttpJspBase.java:70）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:477）
org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:395）
org.apache.jasper.servlet.JspServlet.service（JspServlet.java:339）
javaservlet.http.HttpServlet.service（HttpServlet.java:728）
org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）
注意：根本原因的完整堆栈跟踪可在服务器日志中找到。
[1]: http://www.javawebtutor.com/code/jsp/LoginExample.zip
[2]: https://i.stack.imgur.com/XcLfl.png

似乎存在版本问题。请参阅下面的链接：您是否有关于服务器错误的更多信息？日志中的某个地方应该是带有一些MySQL引用的stracktrace。另外，请注意，您的JSP没有关闭语句+连接，您最终会遇到问题。更新jdbc连接器后R文件与MySQL版本的标准一致，这是我收到的错误HTTP状态500 -内部服务器错误类型异常报告消息java java .Servel.ServLeExp:java. q.sql·SqExExc:用户'root ' @ LoalHoal'拒绝访问（使用密码：是）说明服务器遇到意外情况，无法满足请求。

    <%@page import="java.sql.Statement"%>
    <%@page import="java.sql.Connection"%>
    <%@page import="com.example.util.DBUtil"%>
    <%
        String userName = request.getParameter("username");
        String password = request.getParameter("password");
        String firstName = request.getParameter("firstname");
        String lastName = request.getParameter("lastname");
        String email = request.getParameter("email");
        Connection con = DBUtil.getMySqlConnection();
        Statement st = con.createStatement();
        //ResultSet rs;
        int i = st
                .executeUpdate("insert into EMPLOYEE(FIRST_NAME, LAST_NAME, EMAIL, USER_NAME, PASSWORD) values ('"
                        + firstName
                        + "','"
                        + lastName
                        + "','"
                        + email
                        + "','" 
                        + userName
                        + "','" 
                        + password 
                        + "')");
        if (i > 0) {
            response.sendRedirect("welcome.jsp");
        } else {
            response.sendRedirect("index.jsp");
        }
    %>






**THE ERROR I GET**


org.apache.jasper.JasperException: An exception occurred processing [/registration.jsp] at line [10]

7:  String firstName = request.getParameter("firstname");enter code here
8:  String lastName = request.getParameter("lastname");
9:  String email = request.getParameter("email");
10:     Connection con = DBUtil.getMySqlConnection();
11:     Statement st = con.createStatement();
12:     //ResultSet rs;
13:     int i = st


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:618)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:500)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Root Cause 
javax.servlet.ServletException: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:917)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:846)
    org.apache.jsp.registration_jsp._jspService(registration_jsp.java:126)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Root Cause 

    com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Client does not support authentication protocol requested by server; consider upgrading MySQL client
        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        java.lang.reflect.Constructor.newInstance(Unknown Source)
        com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        com.mysql.jdbc.Util.getInstance(Util.java:384)
        com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
        com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3566)
        com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3498)
        com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:919)
        com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:4004)
        com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1284)
        com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2312)
        com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2122)
        com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:774)
        com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
        sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        java.lang.reflect.Constructor.newInstance(Unknown Source)
        com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
        com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:375)
        com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:289)
        java.sql.DriverManager.getConnection(Unknown Source)
        java.sql.DriverManager.getConnection(Unknown Source)
        com.example.util.DBUtil.getMySqlConnection(DBUtil.java:10)
        org.apache.jsp.registration_jsp._jspService(registration_jsp.java:94)
        org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
        org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
        org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)


Note The full stack trace of the root cause is available in the server logs.


  [1]: http://www.javawebtutor.com/code/jsp/LoginExample.zip
  [2]: https://i.stack.imgur.com/XcLfl.png