HttpServletResponse 返回值如何返回文件

要使用HttpServletResponse返回文件，可以按照以下步骤进行操作：

1. 设置响应头部信息，包括Content-Disposition和Content-Type。在Content-Disposition头部中，设置attachment参数可以让浏览器将响应视为下载文件。在Content-Type头部中，设置文件的MIME类型。
2. 使用response.getOutputStream()获取到输出流，然后将文件内容写入到输出流中。
3. 关闭输出流并刷新响应。

以下是一个示例代码，展示了如何使用HttpServletResponse返回文件：

@WebServlet("/download")
public class FileDownloadServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 获取要下载的文件路径
        String filePath = "/path/to/file.pdf";
        
        // 设置响应头部信息
        response.setContentType("application/pdf");        response.setHeader("Content-Disposition", "attachment; filename=file.pdf");
        
        // 读取文件并写入输出流
        try (InputStream in = new FileInputStream(filePath);
             OutputStream out = response.getOutputStream()) {
            byte[] buffer = new byte<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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