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在你潇洒的写下InputStream转到response的时候，需要先设置下Response，否则浏览器并不会弹出下载框
预处理
"Content-Type", "application/octet-stream"是内容类型，告诉浏览器这个是什么，可以参照对照表 https://www.runoob.com/http/http-content-type.html
public static void preInitResponseForFileStream(HttpServletResponse response, String name) {
response.reset();
//避免中文乱码
response.setHeader("Content-Disposition", "attachment;filename=" + new String(name.getBytes(), StandardCharsets.ISO_8859_1));
response.setHeader("Connection", "close");
//设置传输的类型
response.setHeader("Content-Type", "application/octet-stream");
response.setHeader("Content-Transfer-Encoding", "chunked");
response.setHeader("Access-Control-Allow-Origin", "*");
response.setContentType("application/OCTET-STREAM");
}
下载
这里也顺便把下载贴上来吧，也可以使用其他流的处理方式，比如java7的Files工具类等，或者apache的IOUtils
public static void download(String fileUrl, HttpServletResponse response) {
try (BufferedInputStream in = new BufferedInputStream(new URL(fileUrl).openStream());
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream())) {
byte dataBuffer[] = new byte[1024];
int bytesRead;
while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
out.write(dataBuffer, 0, bytesRead);
}
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
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