springmvc 文件下载报错 getOutputStream() has already been called for this response

使用struts2 进行文件下载是手茄，总报错：

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

解决办法：

把对应的action的毕乎察返回设置为空，即可轻松解决。

例如:

public class DownloadFileAction extends ActionSupport implements

ServletRequestAware, ServletResponseAware {

/**

*

*/

private static final long serialVersionUID = -7448748577778248376L

private HttpServletRequest request

private HttpServletResponse response

private String savePath

@Override

public String execute() throws Exception {

String fileName=request.getParameter("fileName")

String fullPath=getSavePath()+"//"+fileName

fileName=new String(fileName.getBytes("utf-8"),"iso-8859-1")

InputStream is=new FileInputStream(fullPath)

int len=0

byte []buffers=new byte[1024]

response.reset()

response.setContentType("application/x-msdownload")

response.addHeader("Content-Disposition", "attachmentfilename=\""+fileName+"\"")

OutputStream os = null

//把文件内容通过输出流打印到页面上供下载

while((len=is.read(buffers))!=-1){

os=response.getOutputStream()

os.write(buffers, 0, len)

}

is.close()

os.flush()

//return SUCCESS//会报错：java.lang.IllegalStateException: getOutputStream() has already been called for this respons

return null//顷余ok

}

public void setServletRequest(HttpServletRequest req) {

this.request=req

}

public void setServletResponse(HttpServletResponse resp) {

this.response=resp

}

@SuppressWarnings("deprecation")

public String getSavePath() {

return request.getRealPath(savePath)

}

public void setSavePath(String savePath) {

this.savePath = savePath

}

}

要不给你一个可以直接调用的方法吧,你也可以对比修改

/**

     * 下载文件

     * 

     * @param request

     * @param response

     * @param storeName　被下载文件路径

     * @param contentType  推荐:application/octet-stream

     * @param realName　下载时显示的文件名称

     * 返闷陵@throws Exception

     */

    public static void download(HttpServletRequest request, HttpServletResponse response, String storeName, String contentType, String realName)

            throws Exception {

        request.setCharacterEncoding("UTF-8")

        BufferedInputStream bis = null

       漏戚 BufferedOutputStream bos = null

        try {

            String downLoadPath = storeName

            long fileLength = new File(downLoadPath).length()

            response.setContentType(contentType)

            response.setHeader("Content-disposition", "attachment filename=" + new String(realName.getBytes("utf-8"), "ISO8859-1"))

            response.setHeader("Content-Length", String.valueOf(fileLength))

            bis = new BufferedInputStream(new FileInputStream(downLoadPath))

            bos = new BufferedOutputStream(response.getOutputStream())

            byte[] buff = new byte[2048]

            int bytesRead

            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

                bos.write(buff, 0, bytesRead)

            }

        } catch (Exception e) {

            e.printStackTrace()

            throw e

       罩饥 } finally {

            if (bis != null)

                bis.close()

            if (bos != null)

                bos.close()

        }

    }

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