Question

我是弹簧技术的新手，请帮助解决这个问题。我正在开发一个春天的Web应用程序，我有一个leaveRecords.jsp页面，它应该加载以下内容，

对于每个记录，页面应使用两个按钮（如

）将记录显示在表中

<button id="Accept"
         name="action"
         type="submit"
         value="Accept<%= dtoBean.getEmployee_id()/> 

<button id="Reject"
         name="action"
         type="submit"
         value="Accept<%= dtoBean.getEmployee_id()/>

点击“接受”按钮后，将执行相关操作并应重定向到同一页面，但这次页面应包含按钮

<button id="Cancel" name="action" type="submit" value="Accept<%= dtoBean.getEmployee_id() /＆gt;

leaveRecords.jsp 是：

        <form:form method="POST" action="upcomingLeaves.do" commandName="loginForm" modelAttribute="loginForm">
        <% CommonDTOBean dtoBean=(CommonDTOBean)session.getAttribute("dtoBean");
            List upcomingLeavesList=(ArrayList)session.getAttribute("upcomingLeavesList");%>
    <table ><col><thead ><tr style="background-color:#666633;">
                        <th>Employee id</th>
                        <th>Leave Balance</th>
                        <th>Date</th>
                        <th>Leave Type</th>
                        <th>Leave Period</th>
                        <th>Applied Leaves</th>
                        <th>Status</th>
                        <th colspan="4">Action</th>
            </tr></thead>
                  <tbody>
        <%if(upcomingLeavesList!=null){
            for(int i=0;i<upcomingLeavesList.size();i++){
            dtoBean=(CommonDTOBean)upcomingLeavesList.get(i);%>
            <tr>
                <td ><span><%= dtoBean.getEmployee_id() %></span></td>
                <td ><span><%= dtoBean.getNo_of_leave() %></span></td>
                <td ><span></span><%= dtoBean.getFromDate() %>-<%= dtoBean.getToDate() %></td>
                <td > <span><%= dtoBean.getLeaveType() %></span></td>
                <td ><span></span><%= dtoBean.getLeavePeriod() %></td>
                <td><span></span><%= dtoBean.getAppliedLeave() %></td>
                <td><span></span><%= dtoBean.getLeaveStatus() %></td>
                <td><button id="btnAccept" name="action" type="submit" value="Accept<%= dtoBean.getEmployee_id() %>" onclick="">Approve</button></td>
                <td><button id="btnReject" name="action" type="submit" value="Reject<%= dtoBean.getEmployee_id() %>">Reject</button></td>
                <td><button id="btnCancel" name="action" type="submit" value="Cancel<%= dtoBean.getEmployee_id() %>">Cancel</button></td>
                </tr>
                <%}}%>
            </tbody>
  </table>
</form:form>

控制器类是：

public String ApproveLeaves(@RequestParam(required=false , defaultValue="")String aion,@RequestParam(required=false,defaultValue="")String Cancel,HttpServletRequest request, HttpServletResponse response, ModelMap model){
        try{
            //following strings are used for getting the value of button and spiting it to get employee id 

            String buttonName=request.getParameter("action");
            String buttonValue=buttonName.substring(0,6);// here we are spliting up the string and button name
            int buttonValue1=Integer.parseInt(buttonName.substring(6));

                    if (buttonValue.equalsIgnoreCase("Reject")) 
                    {

                        boolean status=LeaveStatusWorker.Approve(buttonValue1,buttonValue,dtoBean);
                        if (status) 
                        {
                                        return "redirect: GlobalConstants.UPCOMING_LEAVES";
                        }
                    }

                    if (buttonValue.equalsIgnoreCase("Cancel")) 
                    {

                        boolean status=LeaveStatusWorker.Approve(buttonValue1,buttonValue,dtoBean);
                        if (status) 
                        {

                            return "redirect: GlobalConstants.UPCOMING_LEAVES";
                        }
                    }

                    if (buttonValue.equalsIgnoreCase("Accept")) 
                    {


                        boolean status=LeaveStatusWorker.Approve(buttonValue1,buttonValue,dtoBean);
                        if (status) 
                        {

                            return "redirect: GlobalConstants.UPCOMING_LEAVES";
                        }
                    }

            return GlobalConstants.UPCOMING_LEAVES;
            }
            catch(Exception e)
            {
                System.out.println(e);
            }
            return GlobalConstants.ERRORPAGE;

    }

服务类有一个db交互方法：

public static boolean Approve(int id,String buttonValue,CommonDTOBean dtoBean2)
    {
        try {
            con=DBConnection.getConnection();
            String query="select no_of_leave from newemp_register where emp_id=?";//get available leaves from db
            pstmt.executeQuery();
                if(buttonValue.equalsIgnoreCase("Cancel"))
                {
                    String approve="Update newemp_register set no_of_leave=? where emp_id=?";
                    pstmt.executeUpdate();
                }
                if(buttonValue.equalsIgnoreCase("Reject"))
                {
                    return true;
                }
                if(buttonValue.equalsIgnoreCase("Accept"))
                {
                        String approve="Update newemp_register set no_of_leave=? where emp_id=?";
                        pstmt.executeUpdate();
                        return true;
                    }
                }


            }//End Of while


        } catch (Exception e) {

        }

return false;
    }//End of Approve

请仔细阅读这个示例，并帮助我，我已经非常努力地在谷歌上搜索但无法解决它。

CommonDTOBean类：

public class CommonDTOBean {
    private int emp_id;

    private String Status;



    public int getEmp_id() {
        return emp_id;
    }
    public void setEmp_id(int emp_id) {
        this.emp_id = emp_id;
    }
    public String getStatus() {
        return Status;
    }
    public void setStatus(String status) {
        Status = status;
    }

Answer 1

使用JSTL条件呈现jsp中的DOM。像：

<form:form method="POST" action="upcomingLeaves.do" commandName="loginForm" modelAttribute="loginForm">        
    <table>
      <thead>
        <tr style="background-color:#666633;">
              <th>Employee id</th>
              <th>Leave Balance</th>
              <th>Date</th>
              <th>Leave Type</th>
              <th>Leave Period</th>
              <th>Applied Leaves</th>
              <th>Status</th>
              <th colspan="4">Action</th>
        </tr></thead>
      <tbody>
      <c:choose>
        <c:when test="${not empty upcomingLeavesList}">
            <c:forEach items="${upcomingLeavesList}" var="upComLeave">
                <tr>
                    <td><span>${upComLeave.emp_id}</span></td>
                    <td><span>${upComLeave.status}</span></td>
                    <td><span>${upComLeave.fromDate} - ${upComLeave.toDate}</span></td>
                    <td><span>${upComLeave.leaveType}</span></td>
                    <td><span>${upComLeave.leavePeriod}</span></td>
                    <td><span>${upComLeave.appliedLeave}</span></td>
                    <td><span>${upComLeave.leaveStatus}</span></td>
                    <c:if test="${upComLeave.leaveStatus ne 'accepted' }"> //check status if accepted, don't render Accept button
                        <td><button id="btnAccept" name="action" type="submit" value="Accept${upComLeave.emp_id}" onclick="">Approve</button></td>
                    </c:if>
                    <c:if test="${upComLeave.leaveStatus ne 'rejected' }">//check status if accepted, don't render Reject button
                    <td><button id="btnReject" name="action" type="submit" value="Reject${upComLeave.emp_id}">Reject</button></td>
                    </c:if>
                    <c:if test="${upComLeave.leaveStatus eq 'cancel' }">//check status if cancel, render cancel button
                    <td><button id="btnCancel" name="action" type="submit" value="Cancel${upComLeave.emp_id}">Cancel</button></td>
                    </c:if>
                </tr>
            </c:forEach>
        </c:when>
        <c:otherwise>
            upcomingLeavesList is empty or null..
        </c:otherwise>
      </c:choose>
      </tbody>      
  </table>
</form:form>

编辑1（基于评论）：

如果我点击批准页面应重定向只有取消和拒绝按钮

如果条件如下，请再使用一次：

<c:if test="${upComLeave.leaveStatus eq 'accepted' }">
    <td><button id="btnReject" name="action" type="submit"  value="Reject${upComLeave.emp_id}">Reject</button></td>

<td><button id="btnCancel" name="action" type="submit" value="Cancel${upComLeave.emp_id}">Cancel</button></td>
</c:if>

注意：

在jsp：

之上添加它

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

是否可以动态添加按钮并相应地传递它们的值？

1 个答案: