Question

我正在尝试将post方法发送到servlet。它是如何工作的，它将检查操作字符串，然后触发命令DeleteCommand并单击表中的对象然后它获取Reg对象的Id并将其从数据库中删除..

所以这是我的servlet：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
     String action = request.getParameter("action");
    System.out.println(action);
    if (action != null) {
        Command command = new CommandFactory().createCommand(action);
        if (command != null) {
            command.execute(request, response);
        }
    }
}

这是我的命令Factory和它将根据操作字符串触发的命令类：

 public Command createCommand(String actionString) {
    Command command = null;
    System.out.println(actionString);
    //Instantiate the required Command object...
    if (actionString.equalsIgnoreCase("login")) {
        command = new LoginUserCommand();
    } else if (actionString.equalsIgnoreCase("manageRegistrar")) {
        command = new ManageRegistrarCommand();
    } else if (actionString.equalsIgnoreCase("modifyReg")) {
        command = new ModifyRegistrarCommand();
    } else if (actionString.equalsIgnoreCase("logout")) {
        //command = new LogoutUserCommand();
    } else if (actionString.equalsIgnoreCase("something")) {
        //command = new ManageRegistrarCommand();
    } else if (actionString.equalsIgnoreCase("delete")) {
        command = new DeleteRegistrarCommand();
    } else if (actionString.equalsIgnoreCase("changePassword")) {
       // command = new ChangePasswordCommand();
    } else if (actionString.equalsIgnoreCase("verifyEmail")) {
        //command = new VerifyEmailCommand();
    } else if (actionString.equalsIgnoreCase("resendVerificationMail")) {
        //command = new ResendVerificationMailCommand();
    }else if(actionString.equalsIgnoreCase("modify")){
        //command = new ModifyUserCommand();
    }else if(actionString.equalsIgnoreCase("addRegistrar")){
        //command = new CreateUserCommand();
    }
    //Return the instantiated Command object to the calling code...
    return command;// may be null
}

这是我正在尝试获取实际参数值的命令：

public class DeleteRegistrarCommand implements Command {

@Override
public void execute(HttpServletRequest request, HttpServletResponse response) {
    int userId = Integer.parseInt(request.getParameter("regId"));
    //System.out.println(userIdList.get(0));
    UserServices userservice = new UserServices();
    HttpSession session = request.getSession();
    try {
        if (userId > 0) {
                Registrar registrar = userservice.getRegById(userId);
                if (userservice.delete(registrar.getRegId())) {
                    session.setAttribute("status", 0);
                    session.setAttribute("statusMessage", "Delete Success");
                } else {
                    session.setAttribute("status", 1);
                    session.setAttribute("statusMessage", "Delete Failed");
                }                
        } else {
            session.setAttribute("status", 6);
            session.setAttribute("statusMessage", "Ohoooo no.. Nothing to Delete.. ha ha ha");
        }
        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/ProcessResult.jsp");
        dispatcher.forward(request, response);
    } catch (ServletException | IOException ex) {
        Logger.getLogger(DeleteUserCommand.class.getName()).log(Level.SEVERE, null, ex);
        session.setAttribute("status", 4);
        session.setAttribute("statusMessage", ex.getMessage());
        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/ProcessResult.jsp");
        try {
            dispatcher.forward(request, response);
        } catch (ServletException | IOException ex1) {
            Logger.getLogger(DeleteUserCommand.class.getName()).log(Level.SEVERE, null, ex1);
        }
    }

}

}

确定所有这些都应该正常工作（希望如此）。我在客户端（JSP页面）遇到问题。我正在尝试将操作类型和命令所需的值发送到我的servlet ...这就是我在href上的内容，但似乎不正确。

所以就是这样：

            <td class="text-center"><a href="WebActionServlet?action=delete?regId=<%=deleteId%>"><samp class="glyphicon glyphicon-remove"></samp></td>

但这似乎不起作用，当我点击它时，我只是向我显示一个空白页面并且没有执行实际操作..有谁知道如何使用href链接执行此操作或者它们是否更好方式可能是java脚本或ajax方法用于执行此操作并获取id并基于该表数据链接发送操作？

感谢任何帮助。提前谢谢。

发送Servlet操作使用href链接和值

0 个答案: