JSP請求不會轉到Java Servlet類

Question

我有一個表，其中包含帶有查看，更新，刪除圖標的記錄。 在點擊查看和更新​​時，我正在將我的請求傳遞給其他jsp。 在單擊刪除圖標時，請求需要進入我的servlet類。 在那里應該執行刪除查詢。

這是我的桌子

在單擊刪除圖標時，我正在獲取ID，並在網址中刪除值。 看到圖像。 但是請求不會發送到Java servlet。

這是我的代碼

Jsp代碼：

<%
    FormRegistration fr = new FormRegistration();
    List<UserDetailsBean> list = fr.getUserDetails();
   %>
<form method="post" action="./BrightSymphonyController" >
 <%
    for(int i=0;i<list.size();i++){
  %>
    <table id="example" class="display" cellspacing="0" width="100%">
      <thead>
         <tr>
           <th style="display: none;">ID</th>
         </tr>
      </thead>
      <tbody>
        <td>
          <a href="./BrightSymphonyController?id=<%=list.get(i).getId()%>&delete=Delete" class="urlImgDelete" title="Delete"><!--here i have delete icon -->
          </a>
        </td>
    <%}%>
    </tbody>
    </table>
</form>

Servlet類：

@WebServlet("/BrightSymphonyController")
public class BrightSymphonyController extends HttpServlet {
/**
 * @see HttpServlet#HttpServlet()
 */
public BrightSymphonyController() {
    //super();
    // 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
}
/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String deleteuser = request.getParameter("delete");
        System.out.println("deleteuser============"+deleteuser);
        String id=request.getParameter("id");
        System.out.println("id============"+id);
        }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
 <display-name>brightsymphony</display-name>
 <welcome-file-list>
 <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <servlet>
<servlet-name>BrightSymphony</servlet-name>
<servle-class>com.s2s.brightsymphony.controller.BrightSymphonyController
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BrightSymphony</servlet-name>
<url-pattern>/BrightSymphony</url-pattern>
</servlet-mapping>
</web-app>

請幫我。

Answer 1

您正在發送get參數，將代碼從doPost（）移至doGet（）方法，如下所示

@WebServlet("/BrightSymphonyController")
public class BrightSymphonyController extends HttpServlet {
/**
 * @see HttpServlet#HttpServlet()
 */
public BrightSymphonyController() {
    //super();
    // 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 deleteuser = request.getParameter("delete");
        System.out.println("deleteuser============"+deleteuser);
        String id=request.getParameter("id");
        System.out.println("id============"+id);
}
/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


        }
}

Answer 2

將代碼從doPost()移至doGet()

href發送的請求get不post ，您使用的不是form發送請求post您的請求從發送href

如果您希望將請求作為post發送

<form method="post" action="./BrightSymphonyController" >
 <%
    for(int i=0;i<list.size();i++){
  %>
    <table id="example" class="display" cellspacing="0" width="100%">
      <thead>
         <tr>
           <th style="display: none;">ID</th>
         </tr>
      </thead>
      <tbody>
        <td>
          <input type="submit" class="urlImgDelete" value="Delete" /> 
          <input type="hidden" name="id" value="<%=list.get(i).getId()%>"/>
          <input type="hidden" name="delete" value="Delete" />
        </td>
    <%}%>
    </tbody>
    </table>
</form>

Answer 3

寫這個

<a href="<%=request.ContextPath()%>/BrightSymphonyController?id=<%=list.get(i).getId()%>&delete=Delete" class="urlImgDelete" title="Delete">

裝的

  <a href="./BrightSymphonyController?id=<%=list.get(i).getId()%>&delete=Delete" class="urlImgDelete" title="Delete">

我希望這個能幫上忙！！！！