获得错误“getOutputStream（）已被调用此响应”

问题描述

我正在显示一些事件的报告。我希望控制器显示弹出窗口以进行保存并打开。

I am showing report on some event.I want controller to show popup for save and open .

我已经设置文件作为响应，设置响应后我返回查看。

I already set file in response , after setting response i am returning view.

现在我的问题是，

我收到错误java.lang.IllegalStateException：getOutputStream（ ）已经被调用了这个响应

I am getting error " java.lang.IllegalStateException: getOutputStream() has already been called for this response"

在我的控制器类中，我写了以下代码：

In my controller class i have written following code :

......一些代码.......

......some Code.......

InputStream is =
        new FileInputStream(new File("c:/reports/test_jasper.pdf"));
            response.setHeader("Content-Disposition","attachment;filename=\"test_jasper.pdf\"");
            OutputStream opStream = response.getOutputStream();
            IOUtils.copy(is, opStream);
            response.flushBuffer();
            HttpServletResponse response1 = new HttpServletResponse();



        model.addAttribute(ABC, new abc());

        model.addAttribute(DEF, new def());
        return SOME_VIEW;

框架：

Spring-MVC，Hibernate

Spring-MVC,Hibernate

异常：

java.lang .IllegalStateException：getOutputStream（）已被调用此响应

java.lang.IllegalStateException: getOutputStream() has already been called for this response

所需的O / P：
我想要回应来显示弹出窗口对于文件，并希望浏览器重定向到其他视图。

Desired O/P :I want response to show popup for file , and want browser to redirect to some other view.

推荐答案

在请求处理期间， HttpServletResponse正在调用.getWriter（）和 HttpServletResponse.getOutputStream（）。根据规范，使用OutputStream和Writer是非法的。

During the request processing both HttpServletResponse.getWriter() and HttpServletResponse.getOutputStream() are being called. And as per the spec, it is illegal to use both OutputStream and Writer.

尝试invoje HttpServletResponse时抛出异常.getWriter（）其他地方/

The exception you are getting is being thrown while trying to invoje HttpServletResponse.getWriter() somewhere else/

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