在jsp表单中添加数据后，我在jsp中检索列表中的数据。列表根据我的jsp文件更新。但是我无法更新数据，一旦我点击更新按钮，jsp表单就不会显示在之前的jsp文件列表中选择的数据。这是我的控制者。
This is my list jsp form
<br />
<br />
<a class="btn btn-success" href="addEmployee2.jsp" ><button><font color='red'>Add New Employee</font></button></a>
<table border="3" class="table table-striped responsive-utilities jambo_table bulk_action">
<thead>
<tr>
<th>ID</th>
<th>Name</th>
<th>Phone Number</th>
<th>Address</th>
<th>Role</th>
<th>Action</th>
</tr>
</thead>
<%
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con= DriverManager.getConnection("jdbc:Oracle:thin:@localhost:1521:XE", "hally", "hally");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from EMPLOYEE");
while (rs.next()) {
%>
<tr>
<td><%= rs.getString(1) %></td>
<td><%= rs.getString(2) %></td>
<td><%= rs.getString(3) %></td>
<td><%= rs.getString(4) %></td>
<td><%= rs.getString(6) %></td>
<td><a href="updateEmployee.jsp">Update</a><br/>
<button id="del" type="submit" class="btn btn-success">Delete</button><br/>
</td>
</td>
</tr>
<% }%>
</table>
<br />
<br />
this is my update jsp form
<br />
<br />
<span class="section">Personal Info</span>
<form class="form-horizontal form-label-left" action="EmployeeController?action=edit" method="post">
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="name">Identification Card <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="number" class="form-control col-md-7 col-xs-12" name="empID" value="${empDetail.empID}">
</div>
</div>
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="name">Name <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="text" class="form-control col-md-7 col-xs-12" name="empName" value="${empDetail.empName}">
</div>
</div>
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="number">Phone Number <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="number" id="number" name="empPhoneNum" class="form-control col-md-7 col-xs-12" value="${empDetail.empPhoneNum}">
</div>
</div>
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="textarea">Address <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="text" name="empAddress" class="form-control col-md-7 col-xs-12" value="${empDetail.empAddress}"></textarea>
</div>
</div>
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="textarea">Password <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="password" name="password" class="form-control col-md-7 col-xs-12" value="${empDetail.empPassword}"></textarea>
</div>
</div>
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="textarea">Role <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="number" name="empRole" class="form-control col-md-7 col-xs-12" value="${empDetail.empRole}"></textarea>
</div>
</div>
<div class="item form-group">
<label class="control-label col-md-3 col-sm-3 col-xs-12" for="textarea">Level <span class="required">*</span>
</label>
<div class="col-md-6 col-sm-6 col-xs-12">
<input type="text" name="empLevel" class="form-control col-md-7 col-xs-12" placeholder="e.g. Employee" value="${empDetail.empLevel}"></textarea>
</div>
</div>
<button id="upd" type="submit" class="btn btn-success">Update</button>
</form>
<form class="form-horizontal form-label-left" action="EmployeeController?action=delete" method="post">
<input type="hidden" class="form-control col-md-7 col-xs-12" name="empID" value="${empDetail.empID}">
<button id="del" type="submit" class="btn btn-success">Delete</button>
</form>
@WebServlet("/EmployeeController")
public class EmployeeController extends HttpServlet {
private static final long serialVersionUID = 1L;
private EmployeeDA edao;
private static String DELETE_DROP = "searchEmployee2.jsp";
private static String INSERT_OR_EDIT = "searchEmployee2.jsp";
/**
* @see HttpServlet#HttpServlet()
*/
public EmployeeController() {
super();
edao = new EmployeeDA();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
/*String forward="";
String action = request.getParameter("action");
if (action.equalsIgnoreCase("listCust")){
System.out.println("listCust triggered");
forward = "searchCustomer.jsp";
request.setAttribute("custsBean", cdao.getAllCusts());
}
else {
System.out.println("xxx triggered");
forward = INSERT_OR_EDIT;
}
RequestDispatcher view = request.getRequestDispatcher(forward);
view.forward(request, response);*/
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String forward="";
String action = request.getParameter("action");
if (action.equalsIgnoreCase("search")){
try {
//String forward="pages/ExistCust.jsp";
String searchString = request.getParameter("searchbox");
Employee emp = edao.searchEmp(searchString);
if( emp.getEmpID() == null || emp.getEmpID() == "" ){
request.setAttribute( "nonExists", "1" );
RequestDispatcher display = request.getRequestDispatcher("searchEmployee2.jsp");
display.forward(request, response);
}
else{
request.setAttribute( "nonExists", "2" );
request.setAttribute( "empDetail", emp );
System.out.println(emp);
RequestDispatcher display = request.getRequestDispatcher("searchEmployee2.jsp");
display.forward(request, response);
}
}
catch (Throwable theException) {
System.out.println(theException);
else if (action.equalsIgnoreCase("edit")){
//System.out.println("cust");
Employee emp = new Employee();
emp.setEmpID(request.getParameter("empID"));
emp.setEmpName(request.getParameter("empName"));
emp.setEmpPhoneNum(request.getParameter("empPhoneNum"));
emp.setEmpAddress(request.getParameter("empAddress"));
emp.setPassword(request.getParameter("password"));
emp.setEmpRole(Integer.parseInt(request.getParameter("empRole")));
emp.setEmpLevel(request.getParameter("empLevel"));
String ic = request.getParameter("empID");
edao.updateEmp(emp);
RequestDispatcher view = request.getRequestDispatcher("searchEmployee2.jsp");
request.setAttribute( "nonExists", "2" );
request.setAttribute("empDetail", edao.searchEmp(ic));
request.setAttribute("dispMsg", "Successfully Updated!");
view.forward(request, response);
}
else if (action.equalsIgnoreCase("delete")){
System.out.println("DELETE");
String empIc = request.getParameter("empID");
edao.deleteEmp(empIc);
//forward = DELETE_DROP;
//request.setAttribute("custs", cdao.getAllCusts());
RequestDispatcher view = request.getRequestDispatcher("searchEmployee2.jsp");
request.setAttribute( "nonExists", "1" );
request.setAttribute("dispMsg", "Successfully Deleted!");
view.forward(request, response);
}
}