用Jsp+servlet+javaben插入mysql成功，为什么还显示数据格式转换错误呢？

Question

我用myeclipse进行开发，数据库用的是mysql，先定义了一个javabean-Bbsuser，这个bean里定义了数据库中用户表的相关字段,我把用于登录和注册都写在了同一个页面里，可是注册时一点提交，就显示如下错误：严重: Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException: bbs.Bbsuser
at org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:63)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
at bbs.BbsloginServlet.forward(BbsloginServlet.java:115)
at bbs.BbsloginServlet.user_add(BbsloginServlet.java:100)
at bbs.BbsloginServlet.doGet(BbsloginServlet.java:31)
at bbs.BbsloginServlet.doPost(BbsloginServlet.java:14)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at bbs.EncodingFilter.doFilter(EncodingFilter.java:46)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:831)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1203)
at java.lang.Thread.run(Thread.java:595)
org.apache.jasper.JasperException: bbs.Bbsuser
at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)
at bbs.BbsloginServlet.forward(BbsloginServlet.java:115)
at bbs.BbsloginServlet.user_add(BbsloginServlet.java:100)
at bbs.BbsloginServlet.doGet(BbsloginServlet.java:31)
at bbs.BbsloginServlet.doPost(BbsloginServlet.java:14)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at bbs.EncodingFilter.doFilter(EncodingFilter.java:46)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:831)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1203)
at java.lang.Thread.run(Thread.java:595)
可是我在数据库里却已经插了注册的用户，还有，登录的时候也是显示这个错误请问一下，是不是myeclipse里的字符集设置出了问题呢？？？

Answer 1

贴一下相关的代码，希望有人能帮我看看，挺郁闷的，这个做了很多次了，都没问题，感觉也不应该出问题啊，唉
下面是那个javabean代码：package bbs;import java.sql.Timestamp;public class Bbsuser {
    /**
     * 超级管理员
     */
    public final static int SUPERADMIN = 1;    /**
     * 普通用户
     */
    public final static int GENERAL = 0;
    
    private String name;
    private String password;
    private String email;
   
    private Timestamp registerdate;
    private int degree;
    //private int shortInfoNum;    public Bbsuser() {
    }    public Bbsuser(String name, String password, String email) {
        this.name = name;
        this.password = password;
        this.email = email;
        
        this.degree = GENERAL;
    }    public int getDegree() {
        return degree;
    }    public String getEmail() {
        return email;
    }     public String getPassword() {
        return password;
    }    public Timestamp getRegisterdate() {
        return registerdate;
    }    public String getName() {
        return name;
    }
    
  /*  public int getShortInfoNum(){
    
     return shortInfoNum;
    }*/    public void setDegree(int degree) {
        this.degree = degree;
    }    public void setEmail(String email) {
        this.email = email;
    } 
    public void setPassword(String password) {
        this.password = password;
    }    public void setRegisterdate(Timestamp registerdate) {
        this.registerdate = registerdate;
    }    public void setName(String name) {
        this.name = name;
    }
}
这个有错误嘛，不可能的啊，为什么老是说我数据格式转换错误呢？？？

Answer 2

这个是处理请求的java类，也贴出来希望有人能帮我看看，虽然错误提示没说是这个public class BbsloginServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {         doGet(request, response);    } public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    
String method=request.getParameter("method");
if(method==null){
return ;
}
else if(method.equalsIgnoreCase("user_login"))
{
user_login(request,response);
}
else if(method.equalsIgnoreCase("user_add"))
{
user_add(request,response);
}

}
    private void user_login(HttpServletRequest request,HttpServletResponse response){
    
String name=(String)request.getParameter("name");
        String password=(String)request.getParameter("password");
        Bbsuser bbsuser=new Bbsuser();
        bbsuser.setName(name);
        bbsuser.setPassword(password);
        boolean isSuccess=false;
        try{
         isSuccess=BbsUserHandle.userlogin(bbsuser);
         
        }catch(Exception es){
          es.printStackTrace();
            isSuccess = false;
            request.setAttribute("login_error", es.getMessage());
            
        }
        String forward = null;
         //response.setContentType("text/xml;charset=UTF-8");
        //response.setHeader("Cache-Control","no-cache");
        //PrintWriter out=response.getWriter();
       // out.println("<response>");
        if(isSuccess){
         request.getSession().setAttribute("user",bbsuser);
         request.removeAttribute("login_error");
        // out.println("<res>"+"欢迎访问本站"+"</res>");
         forward = "index.jsp";
        }else{
        
          forward="bbslogin.jsp";
         //out.println("<res>"+"登录失败"+"</res>");
          request.setAttribute("login_error", "用户名或密码不匹配");
        }
       // out.println("</response>");
        //out.close();
        forward(request, response, forward);    }
    
    private void user_add(HttpServletRequest request, HttpServletResponse response)
    {
        String name = (String) request.getParameter("name");
        String password = (String) request.getParameter("password");
        String email = (String) request.getParameter("Email");
        Bbsuser user = new Bbsuser(name,password,email);
        boolean isSuccess = false;
        String forward = null;
        
        try{
         BbsUserHandle.userReg(user);
         isSuccess=true;
        }catch(Exception e){
         e.printStackTrace();
         isSuccess=false;
         request.setAttribute("user_add_error", e.getMessage());
        }
        if(isSuccess){
         request.removeAttribute("user_add_error");
            forward = "index.jsp";
        }
        else{
           
                forward = "bbslogin.jsp";
            
        }
        forward(request, response, forward);
    }

Answer 3

哦对了，这个本来是想用ajax实现的，后来改了，没删掉，所以加了注释