这是后端代码:
@RequestMapping("/download")
public void download(String path, HttpServletResponse response) {
if (path == null || path.equals("")) {
throw new ParamDissatisfyException("参数不足!");
}
log.info("下载URL:{}", path);
//过滤URL
path = path.replaceAll("%3A", ":").replaceAll("%2F", "/") //过滤URL 包含中文
.replaceAll("%3F", "?").replaceAll("%3D", "=").replaceAll(
"%26", "&");
path = path.substring(path.lastIndexOf(":") + 1);
path = imageUploadPath + path.substring(path.indexOf("/"));
log.info("确认资源URL:{}", path);
//得到该文件
File file = new File(path);
if (!file.exists()) {
throw new FileNotExistException("文件不存在");
}
//取得文件名。
String filename = file.getName();
try {
//将响应的类型设置为图片
response.setContentType("image/jpeg");
response.addHeader("Content-Length", "" + file.length());
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
FileInputStream fileInputStream = new FileInputStream(file);
OutputStream out = response.getOutputStream();
int len = 0;
byte[] by = new byte[1024 * 8];
while ((len = fileInputStream.read(by)) > 0) {
out.write(by, 0, len);
}
out.close();
fileInputStream.close();
} catch (IOException e) {
log.error(e.getMessage());
}
}
这是前端代码:
let form = $("<form>");
form.attr("style", "display:none");
form.attr("id", "downForm");
form.attr("method", "post");
form.attr("action", action);
let input = $("<input>");
input.attr("type", "hidden");
input.attr("name", "path");
input.attr("value", url);
$("body").append(form);
form.append(input);
form.submit();
$("#downForm").remove();
