Java HttpServletResponse getOutputStream在csv文件上发送html代码

我试图下载一个csv文件，但html代码（页眉和页脚）也被发送到该文件中。我使用的是weblogic，但使用tomcat很好。代码如下：

public void downloadCSVReport(String csvFile, HttpServletResponse response){
        try {

            response.setHeader("Content-Disposition", "attachment; filename=example.csv"); 
            response.setContentType("text/csv");

            ByteArrayInputStream bais = new ByteArrayInputStream(csvFile.toString().getBytes(REPORT_ENCODING));
            IOUtils.copy(bais, response.getOutputStream());

            response.flushBuffer();

        } catch( IOException e ){
            LOGGER.error(e.getMessage(), e);
        }
    }

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谢谢

我的Spring webapp中的这段代码有效

public static void putFileInResponse(HttpServletResponse response, File file, String contentType) throws IOException {
    // Set the headers
    response.setContentType(contentType);// "application/octet-stream" for example
    response.setContentLength((int) file.length());
    response.addHeader("Content-Disposition", new StringBuilder("attachment; filename=\"").append(file.getName()).append("\"").toString());
    response.addHeader("Content-Description", "File Transfer");
    response.addHeader("Content-Transfer-Encoding", "binary");
    response.addHeader("Expires", "0");
    response.addHeader("Cache-Control", "no-cache, must-revalidate");
    response.addHeader("Pragma", "public");
    response.addHeader("Content-Transfer-Encoding", "binary");

    // Write the content of the file in the response
    try (FileInputStream fis = new FileInputStream(file); OutputStream os = response.getOutputStream()) {
        IOUtils.copyLarge(fis, os);
        os.flush();
    }
}

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设置ContentLength有效！额外的数据不再重要，因为ContentLength现在是csvFile.length（）。谢谢