Map<String, Object> map = Maps.newHashMap();
if (key.equals(SignUtils.getKey(url))) {
try {
String path = request.getSession().getServletContext().getRealPath(url);
String[] fv = path.split("\\.");
File newFile = new File(fv[0]+"_sign.png");
// The image generated with the following three lines of code is delayed, that is, it can only be accessed a few seconds after the generation is completed. The specific reason is not clear
// String newUrl = fv[0]+"_sign.png";
// String newFilePath = request.getSession().getServletContext().getRealPath(newUrl);//fv[0]+"_sign.png";
// File newFile = new File(newFilePath);
File oldFile = new File(request.getSession().getServletContext().getRealPath(url));
InputStream in = new FileInputStream(oldFile);
byte[] b = IOUtils.toByteArray(in);
b = ImageUtils.transferAlpha(ImageUtils.ByteToBufferedImage(b), 150, x, y, width, height, rotate);
Files.write(b,newFile);
map.put("result", true);
map.put("url", SignUtils.getUrl()+newFile.getName());
} catch (Exception e) {
e.printStackTrace ();
map.put("result", false);
map.put("message", "操作失败："+e.getMessage());
}
} else {
map.put("result", false);
map.put("message", "Illegal operation");
}
response.flushBuffer();
return map;
This program is to cut out a picture in a web directory, and then save it with another name, and then return the path of the new picture. As a result, the three lines that are commented out are immediately accessible, but it cannot be accessed. Change the way of writing. .
Please see the comments. In fact, the absolute paths obtained by the two are exactly the same, but the second one (the commented out code) has a delay, and it will take three or four seconds to access it.