的Servlet

Question

<%@page import="java.util.List"%>
<%@page import="entity.Membership"%>

<!-- retrieve session object, memList -->
<%
List<Membership> memList = (List)session.getAttribute("memList");
%>

<!-- Display Member -->
<fieldset>
<form action="SMemberId.jsp" align="right">
     <input TYPE="text" name="id" class="textbox" placeholder="Seach Member By ID">&nbsp;
     <input type="SUBMIT" value="Search"/>
    </form>
 <legend><strong><font color="White"> Member List </font></strong></legend>
 <div style="height:245px;overflow:auto;">
<table border="1" width="100%" height="auto" align='center' bgcolor="#00d2ff">
 <tr >
    <th>Member ID</th>
    <th>Member Type</th>
    <th>Name</th>
    <th>IC</th>
    <th>Phone</th>
    <th>Address</th>
    <th>Gender</th>
     <th>Member Fees</th>
</tr>
<% for (Membership membership: memList){ %>
    <tr>
        <td><%= membership.getMemberid()%></td>
        <td><%= membership.getMembertype() %> </td>
        <td><%=  membership.getName() %></td>
        <td><%=  membership.getIc() %></td>
        <td><%=  membership.getPhone() %></td>
        <td><%=  membership.getAddress() %></td>
        <td><%=  membership.getGender() %></td>
        <td><%= membership.getFees() %> </td>
    </tr>
<% } %>
</table>
</div>
</fieldset>

的Servlet

package controller;

import entity.MemService;
import entity.Membership; 
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class SearchMember extends HttpServlet {

@PersistenceContext
EntityManager em;

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    try {
        MemService memService = new MemService(em);
        List<Membership> memList = memService.findAll();
        HttpSession session = request.getSession();
        session.setAttribute("memList", memList);
        response.sendRedirect("membership/DisplayMember.jsp");
    } catch (Exception ex) {
        Logger.getLogger(SearchMember.class.getName()).log(Level.SEVERE, null, ex);
    }
}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the     left to edit the code.">
/**
 * Handles the HTTP <code>GET</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

/**
 * Handles the HTTP <code>POST</code> method.
 *
 * @param request servlet request
 * @param response servlet response
 * @throws ServletException if a servlet-specific error occurs
 * @throws IOException if an I/O error occurs
 */
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    processRequest(request, response);
}

/**
 * Returns a short description of the servlet.
 *
 * @return a String containing servlet description
 */
@Override
public String getServletInfo() {
    return "Short description";
}// </editor-fold>

}

Currenly我只是可以从数据库中显示一个表。我有10个实体。我可以问我如何按照我输入的标准搜索数据，它会自动出现。我不知道如何按标准搜索。示例i键入M001，该表将自动出现具有M001的成员或i按性别M键入，将列出所有Gender M.so我需要创建文本字段并搜索？它需要javascript来做什么？

Answer 1

你的问题是因为它太宽泛了。没有神奇的解决方案可以做到这一点。

您需要从基本解决方案开始，然后从那里进行增强。您可以通过更新下面的请求处理程序来轻松更新Servlet以添加一些基本搜索功能，例如，按名称搜索。

一旦完成这项工作，您将需要查看其他字段的搜索。也许是用户选择他们想要搜索的字段的下拉列表。完成所有这些操作后，您可以查看使用Ajax更新击键表。

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    try {
        MemService memService = new MemService(em);
        List<Membership> memList;

        if(request.getParameter("name") != null){
            memList = memService.findByName(request.getParameter("name"));

        }else{
            memList = memService.findAll();
        }

        request.setAttribute("memList", memList);

        RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("membership/DisplayMember.jsp");
        dispatcher.forward(request, response);

    } catch (Exception ex) {
        Logger.getLogger(SearchMember.class.getName()).log(Level.SEVERE, null, ex);
    }
}

你的表格：

<form align="right">
     <input type="text" name="name" class="textbox" placeholder="Seach Member By Name">&nbsp;
     <input type="SUBMIT" value="Search"/>
</form>

Jsp按标准搜索

的Servlet

1 个答案: