如何将一个JSP传递给另一个JSP？

I am creating small web apps and I am facing the following problem. I have 2 JSPs and when I click the submit button, it repeats the value every time. What I want is that when I click on the submit button it should give only the corresponding value.

我正在创建小型网络应用程序,我面临以下问题。我有2个JSP,当我单击提交按钮时,它每次都重复该值。我想要的是,当我点击提交按钮时,它应该只给出相应的值。

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@page import="java.io.*,java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Class Video</title>
</head>
<body>
<form action="second.jsp" method="post">
<table>
<% 

File f=new File("C:/Users/SHAKTI/Desktop/video"); 
File[] list=f.listFiles();
if(list.length!=0){
String s[]=new String[list.length];
for(int i=0;i<list.length;i++){
s[i]=list[i].toString();
String fi=list[i].getName(); 
%> 
<tr><td><%=fi %></td>
<td><input type="text" name="file" value="<%=s[i] %>">
</td>
<td><input type="submit" name="play" value="Play"></td>

</tr>
<%}}
else{
%>
<tr>
<td>There is no any files in the database...</td>
</tr>
<% 
}
%>
</table>
</form>
</body>
</html>

second.jsp

<form action="" method="post">
<%
    response.setHeader("Cache-Control","no-cache"); 
response.setHeader("Pragma","no-cache"); 
response.setDateHeader ("Expires", 0);

String id=request.getParameter("file");
   out.println("id = "+id);
    %>
<input type="submit" name="submit" value="submit>
</form>

6 个解决方案

#1

First Jsp : Set Value in First Page

第一个Jsp:在第一页设置值

request.setAttribute("name",somevalue);

Second Jsp : Retrieve it in Second page

第二个Jsp:在第二页中检索它

request.getAttribute("name")

#2

use queryString

URl: http://myaddress.com/xyz?name=jill&sex=f 
String someName = request.getParameter("name") ; 
String sex = request.getParameter("sex") ;

#3

One way is to use session as described by javaBeginner.

一种方法是使用javaBeginner描述的会话。

you can also create a from on the fly and submit it.

您也可以动态创建并提交。

write a function similar to this one and use it in your success:

写一个类似于这个的函数,并在你的成功中使用它:

function submitValues(url, params) {
var form = [ '<form method="POST" action="', url, '">' ];

for(var key in params) 
    form.push('<input type="hidden" name="', key, '" value="', params[key], '"/>');

form.push('</form>');

jQuery(form.join('')).appendTo('body')[0].submit();   
}

#4

There are many options to pass a value from one jsp to another, Here are some

将值从一个jsp传递到另一个jsp有很多选项,以下是一些选项

1) Adding that as a hidden variable and specifying the value

1)将其添加为隐藏变量并指定值

<input name="file" type="hidden" value=""/>

2)Adding it to the session and retrieving the session variable

2)将其添加到会话并检索会话变量

session.setAttribute("file", value);

3)Passing that as a queryParameter

3)将其作为queryParameter传递

http://......one.jsp?file=""

#5

It is beacause you are iterating the loop here,

这是因为你在这里迭代循环,

for(int i=0;i<list.length;i++){
s[i]=list[i].toString();
String fi=list[i].getName();

so it will print the last element from the loop, to get the name u clicked on the button try this .. Change this line as

所以它将打印循环中的最后一个元素,以获得名称u点击按钮试试这个..改变这一行为

<input type="text" name="file" value="<%=s[i] %>">

as,

<td><input type="button" class="btn" data-reqno=value="<%=s[i] %>" value="file name">

And handle it using jQuery like this , so that you can pass the value to next JSP,

并使用这样的jQuery处理它,以便您可以将值传递给下一个JSP,

<script type="text/javascript">
    $(document).ready(function () {

         $(".btn").click( 
             function() {
                 var selectedFileName = $(this).attr("data-reqno");

                 var urlToApprove = "/yourApp/req/filename?name=" + selectedFileName;

                               }
         );
    });
</script>

And also try to avoid Scriptlets in JSP , you can use JSTL or El for the same purpose . Hope it helps !!

并且还尝试在JSP中避免使用Scriptlet,您可以将JSTL或El用于相同的目的。希望能帮助到你 !!

#6

there are many method to pass variable such as

传递变量的方法有很多种

session.setAttribute()
session.getAttribute
action "xxx.jsp?variable=1"

#1