从java中的servlet调用javascript？

编程入门行业动态更新时间:2024-10-08 22:52:38

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我想从servlet调用javascript函数。

I want to call a function of javascript from servlet.

servlet代码：

servlet code:

File ff = new File(uploadedFile+"/"+fileName+".mp4"); FileOutputStream fileOutSt = new FileOutputStream( ff ); fileOutSt.write(data); fileOutSt.close(); request.setAttribute("src", ff); RequestDispatcher dispatcher=request.getRequestDispatcher("/WEB-INF/jsfunction.js"); dispatcher.include(request, response);

我的javascript代码：

myfunction(fileInput) { var fileUrl = window.URL.createObjectURL(fileInput); }

问题是javascript调用，但它显示代码内容但不执行它。我怎样才能获得fileURL。

The problem is javascript calls but it display the code content but not execute it. how can i get fileURL.

推荐答案

这里有几个问题：

首先，包含您的javascript源是不合适的，因为必须在HTML文件中包含（或引用）。在您的情况下，您正在提供MP4文件。

First, the inclusion of your javascript source is improper, because the javascript must be included (or referenced) always within an HTML file. In your case, instead, you are serving a MP4 file.

如果您必须绝对执行该js代码（请记住，js始终执行在浏览器中），我建议你改为提供HTML页面。在这种情况下，必须在HTML代码中引用jsfunction.js脚本：

If you must absolutely execute that js code (remember that js is always executed in a browser), I suggest you serve an HTML page instead. In this case, the jsfunction.js script must be referenced within the HTML code:

第二：即使你包含了脚本，你也必须调用你的功能。您可以立即从scriptlet中调用它，或者作为对某些客户端事件的响应（ onclick ， onload 等））。

Second: Even if you include the script, you must then invoke your function. You can call it immediately, from a scriptlet, or as a response to some client event (onclick, onload, etc).