javascript 如何从 JSP 文件打开一个新窗口？
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how to open a new window from a JSP file?
提问by Ravi
I need to open a new window from a jsp file. In a JSP file, I take in an input from the user and then send it as an argument to a java method which returns me back the url as a string. I then need to open this in a new window. How do I do that? Below is the jsp file(send_product.jsp) for your reference.
我需要从一个 jsp 文件打开一个新窗口。在 JSP 文件中，我接受来自用户的输入，然后将其作为参数发送给 java 方法，该方法将 url 作为字符串返回给我。然后我需要在新窗口中打开它。我怎么做？下面是jsp文件（send_product.jsp）供您参考。
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="products.*" %>
<!DOCTYPE html>
<%
productManager pm= new productManagerImpl();
String myUrl= null;
if (request.getParameter("product_id") != null) {
// get the paramter
String product_id = request.getParameter("product_id");
try {
//myUrl has the url. Have to open this in a new window
myUrl = pm.getUrl(product_id);
} catch (Exception ex) {
ex.printStackTrace();
}
}
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert</title>
</head>
<body bgcolor="wheat">
<h4 align="right">Send Product</h4>
<hr color="red"/>
<br/><br/>
<a href="index.jsp">Index</a>
<form action="send_product.jsp" method="post">
<% if (myUrl != null && !myUrl.equals("")) {%>
<%= myUrl%>
<p> </p>
<%
}
%>
<table width="75%" align="center" >
<tr>
<td>
Please enter the information below and click "<b>Submit</b>"
</td>
</tr>
<tr>
<td>
<fieldset title="info">
<table border="0" cellspacing="3" cellpadding="0" align="center">
<tr>
<td align="right">
* Product ID:
</td>
<td align="left">
<input type="text" size="20" maxlength="70" name="product_id">
</td>
</tr>
</table>
<hr />
<div align="center">
<input type="submit" name="saveInfo" value="Submit">
</div>
</fieldset>
</td>
</tr>
</table>
</form>
</body>
</html>
回答by BalusC
You need to let your JSP print the following line of JavaScript whenever the URL has been received:
每当收到 URL 时，您都需要让 JSP 打印以下 JavaScript 行：
<script>window.open('<%= myUrl%>', 'YOUR_WINDOW_NAME');</script>
This way JS will open a new window/tab.
这样 JS 将打开一个新窗口/选项卡。
Unrelatedto the concrete question, putting Java code inside JSP like that is a poor practice. Be warned!
与具体问题无关，像这样将 Java 代码放在 JSP 中是一种糟糕的做法。被警告！
