这篇博客介绍了如何在Java Web环境中进行流下载，通过设置响应头实现文件的附件下载，例如将内容写入到`1.html`。同时，展示了使用Apache POI库导出Excel文件到流，`downloadExcel`方法接收工作簿对象、响应和文件名参数，完成Excel的流式下载。
OutputStream out = getResponse().getOutputStream();
getResponse().setHeader("Content-disposition", "attachment;filename="+ URLEncoder.encode("1.html", "UTF-8"));
getResponse().setContentType("application/msexcel;charset=UTF-8");
out.write(replaceContent.toString().getBytes());
out.flush();
out.close();
//replaceContent 为下载的内容
//1.html 为下载的名字
//POI导出流文件下载
public static void downloadExcel(HSSFWorkbook workbook,HttpServletResponse response, String filename) throws IOException {
try {
OutputStream out = response.getOutputStream();
response.setHeader("Content-disposition", "attachment;filename="+ URLEncoder.encode(filename, "UTF-8"));
response.setContentType("application/msexcel;charset=UTF-8");
workbook.write(out);
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
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