java~-照片--用流回显源码

/**
* 回显二维码照片
*/
@RequestMapping(value = "/readCodeSize")
public void readCodeSize(HttpServletRequest request,
HttpServletResponse response) throws Exception {
response.setContentType("text/html; charset=UTF-8");
response.setContentType("image/jpeg");
String activity_id = request.getParameter("activity_id");
if (activity_id.equals("") || activity_id == null) {
return;
} else {
List<MEETING_register_activeityData> data = activeityService.echo(activity_id);
String code_path = data.get(0).getTwo_dimension_code(); 
if (code_path.equals("") || code_path == null) {
return;
} else {
responPhoto(response, code_path);
}
}
}

/**
* 以流的形式写照片
*
* @param response
* @param newpath
* @throws FileNotFoundException
* @throws IOException
*/
private void responPhoto(HttpServletResponse response, String newpath) {
try {
String absolutePath = newpath;
File file = new File(newpath);
System.out.println(absolutePath);
FileInputStream fis = new FileInputStream(file);
OutputStream os = response.getOutputStream();
byte[] b = new byte[2048];
int length;
while ((length = fis.read(b)) > 0) {
os.write(b, 0, length);
}
// 这里主要关闭。
os.close();
fis.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
log.debug("文件没找到：");
} catch (IOException e) {
// TODO Auto-generated catch block
log.debug("读写异常：");
}
}