从JSP转发到另一个JSP，而在它们之间不使用servlet？

Question

I have a JSP page : 我有一个JSP页面：

employee5_searchByName.jsp employee5_searchByName.jsp

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

<!-- EMPLOYEE wants to search items by their name -->

<!DOCTYPE html>
<html>
<head>

    <title>Employee - Search for items by name</title>
    <link rel="stylesheet"
          href="./css/styles.css"
          type="text/css"/>

    <link rel="stylesheet" type="text/css" href="css/jquery.autocomplete.css" />
    <script src="http://www.google.com/jsapi"></script>  
    <script>  
        google.load("jquery", "1");
    </script>
    <script src="js/jquery.autocomplete.js"></script>  
    <style>
        input 
        {
            font-size: 120%;
        }
    </style>      
</head>
<body>

<h1>Employee - Search for items by name</h1>
<h1>
Search for items by name
</h1>

<fieldset>
  <legend>Please enter the item's name :</legend>
  <form action="Employee5_After"> 
    Item's name : <input type="text" name="prod_name" id="myProduct"><br>
    <script>
        $("#myProduct").autocomplete("autocompleteFromDb.jsp");
    </script>
    <input type="submit" value="Register">
  </form>
</fieldset>

</body></html>

It forwards to this servlet : 它转发到此servlet：

Employee5_After 员工5_之后

package controller.employee;

/**
 * Retrieve the record of a given product by its name 
 * using hibernate
 * @author X
 *
 */
@WebServlet("/Employee5_After")
public class Employee5_After extends HttpServlet {

    private static final long serialVersionUID = 1L;
    protected void doGet(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException 
    {
        // grab the product's name that the user entered
        String productName = request.getParameter("prod_name");

        // create DB instance
        DatabaseInventory inventory = new DatabaseInventory();      

        // get the details
        String details = inventory.getProductDetailsByName(productName);
        HttpSession session = request.getSession();

        // forward answer to JSP 
        synchronized(session) 
        {
            if (details != null) // then the product has been found
            {
                session.setAttribute("foundProd", details);
                String addressPath = "/WEB-INF/results/employee/employeeResult5.jsp";
                RequestDispatcher dispatcher = request.getRequestDispatcher(addressPath);
                dispatcher.forward(request, response);
            }
        }
    }

}

That servlet is doing his stuff , and then forwards to a 2nd JSP ,called : 那个servlet正在做他的工作，然后转发到第二个JSP，称为：

employeeResult5.jsp employeeResult5.jsp

<!-- Employee - get a description of a product by its name -->


<!DOCTYPE html>
<html>
<head><title>The details for the product you requested are below</title>
<link rel="stylesheet"
      href="./css/styles.css"
      type="text/css"/>
</head>
<body>
<h1>Here are the details from the product you request :</h1>
<h2>${foundProd}</h2>
<h1>We wish you well - bye bye!</h1>


<fieldset>
  <legend>Go back to Employee's web-page</legend>
   <form action="blablabla"> 
    <a href="backToEmployeeMenu">Press here to continue</a>
  </form>  
</fieldset>

</body></html>

I guess that I can use the <% and %> in the JSP to do the logic side of the servlet (contacting to DB and retrieve data) . 我想，我可以使用<%和%>在JSP做Servlet的逻辑侧（接触以DB和检索数据）。 How can I avoid using a servlet in between , and just pass the data from one JSP to another JSP ? 如何避免在两者之间使用servlet，而仅将数据从一个JSP传递到另一个JSP？

Answer 1

You can use the request.redirect(URL) method to do it. 您可以使用request.redirect（URL）方法来执行此操作。 Or you can use request. 或者您可以使用请求。 forward(req, resp). 前进（要求，分别）。

See example 看例子

Answer 2

Separate the business logic from the font end, there is no need to redirect to an intermediate servlet. 将业务逻辑与字体结尾分开，无需重定向到中间servlet。 The best practice is to put the business logic in a separate class and instantiate that class in the destination page. 最佳实践是将业务逻辑放在单独的类中，然后在目标页面中实例化该类。 Here is one example: 这是一个例子：

mainPage.jsp - create the page similar to your employee5_searchByName.jsp . mainPage.jsp-创建类似于employee5_searchByName.jsp的页面。 Now this page posts the data you enter. 现在，此页面发布您输入的数据。
Create a backing class called - dbData.java (DatabaseInventory in your case)- put all your database query here and functions to retrieve what your want. 创建一个名为dbData.java （在您的情况下为DatabaseInventory）的后备类，将所有数据库查询放在这里，并使用函数检索您想要的内容。 A function like public String searchText(String param) (similar to getProductDetailsByName(productName)) which will essentially fetch your search results from database. 类似于public String searchText（String param）的函数（类似于getProductDetailsByName（productName）），该函数实际上将从数据库中获取搜索结果。
Now the most important part - Instantiate this class in your destination SearchResults.jsp page and show whatever data you get in a manner similar to this: 现在最重要的部分-在目标SearchResults.jsp页面中实例化此类，并以类似于以下的方式显示您获取的所有数据：

 <%@page import="mysource.dbData"%> <% searchParam = request.getParameter("searchStr"); dbData data = new dbData(); String result = data.searchText(searchParam); %> <HTML> <BODY> The result is: <% out.print(result); %> </BODY> </HTML>

The industry standard is to follow an MVC Architecture . 行业标准是遵循MVC体系结构。 Following that will create applications which are clear to understand and easy to maintain. 接下来，将创建易于理解且易于维护的应用程序。

Answer 3

Try this code to forward with parameteres 尝试使用此代码来转发参数

<jsp:forward page="URL">
  <jsp:param nama="param1" value="hello"/>
  <jsp:param nama="param2" value="hello2"/>
  <jsp:param nama="param3" value="hello3"/>
  <jsp:param nama="param4" value="hello4"/>
  .
   ........... and so on
</jsp:forward

从JSP转发到另一个JSP，而在它们之间不使用servlet？

问题描述

3 个解决方案

解决方案1
2 2014-02-02 06:37:27

解决方案2
1 已采纳 2014-02-02 08:22:12

解决方案3
0 2014-02-02 07:21:52

从JSP转发到另一个JSP，而在它们之间不使用servlet？

问题描述

3 个解决方案

解决方案1 2 2014-02-02 06:37:27

解决方案2 1 已采纳 2014-02-02 08:22:12

解决方案3 0 2014-02-02 07:21:52

解决方案1
2 2014-02-02 06:37:27

解决方案2
1 已采纳 2014-02-02 08:22:12

解决方案3
0 2014-02-02 07:21:52