Servlets 在不向Servlet传递参数的情况下显示数据
我希望在不向servlet传递参数的情况下显示数据。 比如当我输入这个url时 本地主机：30050/assignmentbymvc/retrievebyclassorname 这样它就能显示数据了。 我试过了，但它没有显示，而通过这种方式显示数据 localhost:30050/assignmentbymvc/retrievebyclassorname？SearchByName=&SearchByClass= 我的Servlet代码是Servlets 在不向Servlet传递参数的情况下显示数据,servlets,Servlets,我希望在不向servlet传递参数的情况下显示数据。 比如当我输入这个url时 本地主机：30050/assignmentbymvc/retrievebyclassorname 这样它就能显示数据了。 我试过了，但它没有显示，而通过这种方式显示数据 localhost:30050/assignmentbymvc/retrievebyclassorname？SearchByName=&SearchByClass= 我的Servlet代码是 package manipulationStudentD
package manipulationStudentData;
import java.util.*;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(description = "Retrive By Class Or Name", urlPatterns = {
"/RetriveByClassOrName" })
public class RetriveByClassOrNameController extends HttpServlet {
private static final long serialVersionUID = 1L;
public RetriveByClassOrNameController() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
ArrayList<ManipulateStudentBean> Search=new ArrayList<ManipulateStudentBean>();
DatabaseActivityDao database=new DatabaseActivityDao();
/*#################################################################################*/
/*Searching By Student First Name*/
/*#################################################################################*/
if(request.getParameter("SearchByStudent") != "" &&
request.getParameter("SearchByClass") != "" ){
Search=database.showOnClassandName(request.getParameter("SearchByStudent"),
request.getParameter("SearchByClass"));
request.setAttribute("ResultByClassAndName", Search);
request.setAttribute("ResultByFilter", "both");
request.getRequestDispatcher("/ManipulationPage.jsp")
.include(request, response);
}
/*################################################################################*/
/*Searching By Student First Name*/
/*################################################################################*/
else if(request.getParameter("SearchByStudent") != "" &&
request.getParameter("SearchByClass") == ""){
Search=database.showOnName(request.getParameter("SearchByStudent"));
request.setAttribute("ResultSet", Search);
request.setAttribute("ResultByFilter", "student");
request.getRequestDispatcher("/ManipulationPage.jsp")
.include(request, response);
}
/*##########################################################################*/
/*Searching By Student First Name*/
/*##########################################################################*/
else if(request.getParameter("SearchByStudent") == "" &&
request.getParameter("SearchByClass") != ""){
Search=database.showOnClass(request.getParameter("SearchByClass"));
request.setAttribute("ResultSet", Search);
request.setAttribute("ResultByFilter", "class");
request.getRequestDispatcher("/ManipulationPage.jsp")
.include(request, response);
}
/*###############################################################*/
/*Searching By Student First Name*/
/*################################################################*/
else if(request.getParameter("SearchByStudent") == "" &&
request.getParameter("SearchByClass") == "" ){
Search=database.showStudentData();
request.setAttribute("ResultSet", Search);
request.getRequestDispatcher("/ManipulationPage.jsp")
.include(request, response);
}
else{
Search=database.showStudentData();
request.setAttribute("ResultSet", Search);
request.getRequestDispatcher("/ManipulationPage.jsp")
.include(request, response);
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
<html>
<head>
<title>Storing Data </title>
<link rel="stylesheet" type="text\css" href="Index.css" />
</head>
<body>
<div id="links">
<h3>To Add Students Goto This Link</h3>
<h4><a href="/ManipulationPage.jsp" > Students </a> </h4>
<h3>For Updating Deleting Student Record go to this Page</h3>
<h4> <a href="/AssigmentByMVC/RetriveByClassOrName" > Manipulate </a> </h4>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>Manipulation Page</title>
<link rel="stylesheet" type="text\css" href="ManipulationPage.css">
</head>
<body>
<div id="formData">
<c:url var="formActionURL" value="/RetriveByClassOrName" />
<form action="${formActionURL}" method="post" id="searchForm">
<p>
<label for="SearchByStudent"> Student First Name </label>
<input type="text" name="SearchByStudent" />
</p>
<p>
<label for="SearchByClass"> Student Class </label>
<input type="text" name="SearchByClass" />
</p>
<p>
<input type="submit" value="Search"/>
</p>
</form>
</div>
<div id="showData">
<table id="table" cellpadding="3px" border="1px">
<tr>
<th>ID</th>
<th>First Name</th>
<th>Last Name</th>
<th>Father Name </th>
<th>Gender </th>
<th>Date Of Birth</th>
<th>Class</th>
<th>Address</th>
<th>Subjects</th>
<th>Update</th>
<th>Delete</th>
</tr>
<c:forEach var="data" items="${ResultSet}">
<tr>
<td><c:out value="${data.studentId}"></c:out></td>
<td><c:out value="${data.firstName}"></c:out></td>
<td><c:out value="${data.lastName}"></c:out></td>
<td><c:out value="${data.fatherName}"></c:out></td>
<td><c:out value="${data.gender}"></c:out></td>
<td><c:out value="${data.dob}"></c:out></td>
<td><c:out value="${data.classNo}"></c:out></td>
<td><c:out value="${data.address}"></c:out></td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
您正在表单中使用post方法：
<form action="${formActionURL}" method="post" id="searchForm">
在doGet中，当用户单击存储数据页上的链接时，您只需将逻辑转发留给空的operationPage.jsp。您如何调用servlet？您需要通过POST调用它。最简单的方法是使用与参数相关的输入从中创建。我不是调用Jsp页面，而是直接调用servlet，然后通过requestDispatcher包含Jsp页面，但不知何故，您需要传递您使用的这些参数：SearchByStudent、SearchByClass。您可以通过url-？SearchByClass，通过表单或AJAX调用中的输入，但这可能暂时太高级了。你的manufactionPage.jsp看起来怎么样？我已经更新了post GasOk解决了这个问题。多谢加油。刚刚将else部分代码转移到doGet方法，而剩下的部分在post方法中，该方法按照我的要求正确工作