我想獲得「ID」的整數值,但cookie的第二個參數只需要字符串值。它不顯示任何錯誤,但它打印隨機值 ,如「[email protected]」,而我試圖打印它。任何解決方案來解決這個問題。餅乾顯示一些隨機值
@WebServlet("/Delete")
public class Delete extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String s = request.getParameter("id");
Cookie ck1 = new Cookie("name", s);
response.addCookie(ck1);
PrintWriter pw = response.getWriter();
pw.print("<html>");
pw.print("<body>");
pw.println("<form action = 'index.html' > <input type = 'submit' value = 'Home'></form>");
pw.print("</html>");
pw.print("</body>");
int id = Integer.parseInt(request.getParameter("id"));
try{
Class.forName("com.mysql.jdbc.Driver");
}catch(Exception e){
e.printStackTrace();
}
try{
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/jeet","root","jeet");
PreparedStatement pst = con.prepareStatement("Delete from jeet where id = ?");
pst.setInt(1, id);
pst.executeUpdate();
pw.println("<center>");
pw.println("<br>");
pw.println("Your Record is been Deleted");
pw.println("<br>");
Cookie ck2[] = request.getCookies();
pw.println("Your last Record Deleted is " +ck2[1]);
pw.println("</center>");
}catch(Exception e){
e.printStackTrace();
}
}
}
'Cookie'沒有特殊的'toString()'實現,這就是爲什麼JVM引用被打印的原因。您需要提取信息才能自行打印。 檢查提取信息的可用方法:https://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/http/Cookie.html –
您可以將Int轉換爲字符串 – sForSujit
基於@HerrDerb構建s評論,你可能正在尋找類似'ck2 [1] .getValue()'或'ck2 [1] .getName()'的東西。 – mattjegan