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我编写了一个 java servlet 程序，但是当我运行它时，它显示错误 HTTP Status 500 - java.util.Date cannot be cast to java.sql.Date 我搜索了如何以任何其他方式将日期类型插入数据库但是我没有办法这样做。我的代码是：

   package skypark;
    import java.io.*;
    import javax.servlet.*;
    import java.text.*;
    import javax.servlet.http.*;
      import java.sql.*;
      import java.sql.Date;
  public class Registration extends HttpServlet
 {
  /**
   * 
   */
     private static final long serialVersionUID = 1L;
     public static Connection prepareConnection()throws ClassNotFoundException,SQLException
{
String dcn="oracle.jdbc.driver.OracleDriver";
String url="jdbc:oracle:thin:@JamesPJ-PC:1521:skypark";
String usname="system";
String pass="tiger";
Class.forName(dcn);
return DriverManager.getConnection(url,usname,pass);
  }
  public void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException
 {
resp.setContentType("text/html");
PrintWriter out=resp.getWriter();
try
{
String phone1,dofb,date1,month,year,uname,fname,lname,address,city,state,country,pin,email,password,gender,lang,qual,relegion,privacy,hobbies,fav;

uname=req.getParameter("uname");
fname=req.getParameter("fname");
lname=req.getParameter("lname");
date1=req.getParameter("date");
month=req.getParameter("month");
year=req.getParameter("year");
address=req.getParameter("address");
city=req.getParameter("city");
state=req.getParameter("state");
country=req.getParameter("country");
pin=req.getParameter("pin");
email=req.getParameter("email");
password=req.getParameter("password");
gender=req.getParameter("gender");
phone1=req.getParameter("phone");
lang="";
qual="";
relegion="";
privacy="";
hobbies="";
fav="";
dofb=date1 +"-"+ month +"-" + year;
int phone=Integer.parseInt(phone1);
DateFormat formatter ; 
java.util.Date dob ; 
formatter = new SimpleDateFormat("dd-MM-yy");
dob = formatter.parse(dofb); 

Connection con=prepareConnection();
String Query="Insert into regdetails values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
PreparedStatement ps=con.prepareStatement(Query);
ps.setString(1,uname);
ps.setString(2,fname);
ps.setString(3,lname);
ps.setDate(4,(Date) dob);
ps.setString(5,address);
ps.setString(6,city);
ps.setString(7,state);
ps.setString(8,country);
ps.setString(9,pin);
ps.setString(10,lang);
ps.setString(11,qual);
ps.setString(12,relegion);
ps.setString(13,privacy);
ps.setString(14,hobbies);
ps.setString(15,fav);
ps.setString(16,gender);

int c=ps.executeUpdate();

String query="insert into passmanager values(?,?,?,?)";
PreparedStatement ps1=con.prepareStatement(query);

ps1.setString(1,uname);
ps1.setString(2,password);
ps1.setString(3,email);
ps1.setInt(4,phone);

int i=ps1.executeUpdate();

if(c==1||c==Statement.SUCCESS_NO_INFO && i==1||i==Statement.SUCCESS_NO_INFO)
{
    out.println("<html><head><title>Login</title></head><body>");
    out.println("<center><h2>Skypark.com</h2>");
    out.println("<table border=0><tr>");
    out.println("<td>UserName/E-Mail</td>");
    out.println("<form action=login method=post");
    out.println("<td><input type=text name=uname></td>");
    out.println("</tr><tr><td>Password</td>");
    out.println("<td><input type=password name=pass></td></tr></table>");
    out.println("<input type=submit value=Login>");
    out.println("</form></body></html>");
}
else
{
    out.println("<html><head><title>Error!</title></head><body>");
    out.println("<center><b>Given details are incorrect</b>");
    out.println(" Please try again</center></body></html>");
    RequestDispatcher rd=req.getRequestDispatcher("registration.html");
    rd.include(req,resp);
    return;
  }
 }
  catch(ClassNotFoundException cnfe) {
  out.println("<html><head><title>Error!</title><body>");
  out.println("<b><i>Class not found "+ cnfe +"</i></b>");
  out.println("</body></html>");
} catch(SQLException sqle) {
     out.println("<html><head><title>Error!</title><body>");
      out.println("<b><i>Unable to process try after some time Sql error</i></b>");
      out.println("</body></html>");
} catch (ParseException e) {
     out.println("<html><head><title>Error!</title><body>");
      out.println("<b><i>Unable to process Parseint exc " + e +"</i></b>");
      out.println("</body></html>");
}
 /* catch(Exception e)
 {
   out.println("<html><head><title>Error!</title><body>");
  out.println("<b><i>Unable to process try after some time</i></b>");
  out.println("</body></html>");
  RequestDispatcher rd=req.getRequestDispatcher("registration.html");
  rd.include(req,resp);
  return;
}*/
out.flush();
out.close();
}
}

错误是

 HTTP Status 500 - java.util.Date cannot be cast to java.sql.Date
type Exception report
message java.util.Date cannot be cast to java.sql.Date
description The server encountered an internal error that prevented it from fulfilling this request.
exception
 java.lang.ClassCastException: java.util.Date cannot be cast to java.sql.Date
skypark.Registration.doPost(Registration.java:67)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
 note The full stack trace of the root cause is available in the Apache Tomcat/7.0.33logs.

请任何人帮助我解决这个问题。

4

2 回答 2

2

而不是铸造给java.sql.Date你应该创建一个java.sql.Date object

java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());

然后使用sqlDateinps.setDate

于 2012-12-16T19:50:06.000 回答
2

该PreparedStatement.setDate()方法需要一个java.sql.Dateas 参数。您有 a java.util.Datewhich 不是 a java.sql.Date，并且您正试图将其转换为 a java.sql.Date。那是行不通的。强制转换不会改变对象的类型。

要从 a 创建 a java.sql.Date，java.util.Date请使用

java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());
于 2012-12-16T19:50:28.153 回答