如果你按网上说的方法设置了跨域,但仍然出现这个问题,再看看你的请求头是否有如下图的属性,如果没有,那在后端直接设置一下
直接在用到的地方设置 response.setHeader("Access-Control-Allow-Origin", "*");
@PostMapping("/download/homework")
public void hwDownload(@RequestBody Map map,HttpServletResponse response) throws Exception {
String fileName = (String)map.get("fileName");
FileInputStream fis = null;
try {
fis = new FileInputStream(LoadUtil.homeworkFolder + File.separator + fileName);
// 清空输出流
response.reset();
response.setContentType("application/x-download;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("utf-8")));
response.setHeader("Content-Length", String.valueOf(fis.getChannel().size()));
response.setHeader("Access-Control-Allow-Origin", "*");
byte[] b = new byte[100];
int len;
while ((len = fis.read(b)) != -1) {
response.getOutputStream().write(b, 0, len);
}
} catch (IOException e) {
logger.error("异常:" + e);
}
//文件的关闭放在finally中
finally {
try {
response.getOutputStream().flush();
response.getOutputStream().close();
fis.close();
} catch (IOException e) {
logger.error("异常:" + e);
}
}
}