HttpServletResponse获取文件

HttpServletResponse获取文件的方法是通过调用getOutputStream()方法来获取一个ServletOutputStream对象，然后使用该对象进行文件的输出。假设要输出的文件是一个图片文件，可以使用以下代码实现：

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.setContentType("image/jpeg"); // 设置响应内容类型为图片类型
    String imagePath = "path/to/image.jpg"; // 图片文件路径
    File file = new File(imagePath);
    FileInputStream fis = new FileInputStream(file);
    byte[] buffer = new byte<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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