/**
* 生成随机默认头像，如果存在原图，则查询各个尺寸头像，对不存在的头像重新用原图生成
*
* @param userId
* @param userName
* @return
*/
public void avatarGenerate(String userId, String userName) {
// 获取缩略名字
userName = DefaultAvatarGeneratorService.obatainName(userName);
// 判断是否有初始头像，如果有用初始头像切割小头像，然后组装
// 如果没有则随机选择一个初始头像，添加姓名水印后切割小头像，其实是一种容错机制
GridFSDBFile intinalAvatarFile =
imageStoreService.get(AvatarIdGenerator.obtainMobileLargeAvatarId(userId));
// 要裁剪的尺寸
List<Double> thumbnailSizeList = SnapFileConfigUtils.obtainAvatarScaleSizes();
int number = 0;
BufferedImage bimage = null;
if (intinalAvatarFile == null) {
Random random = new Random();
number = random.nextInt(DefaultAvatarCacheService.DEFAULT_AVATAR_NUMBER);
number++;
bimage = DefaultAvatarCacheService.obtainCacheRandomAvatar(number);
// 如果姓名不为空，加水印随机图片
if (!StringUtils.isEmpty(userName)) {
drawName(bimage, userName);
}
} else {
try {
bimage = ImageIO.read(intinalAvatarFile.getInputStream());
thumbnailSizeList = this.obtainThumbnailSizeList(userId);
} catch (IOException e) {
e.printStackTrace();
}
}
int width = bimage.getWidth();
int height = bimage.getHeight();
ByteArrayOutputStream bs = new ByteArrayOutputStream();
ImageOutputStream imOut;
try {
imOut = ImageIO.createImageOutputStream(bs);
ImageIO.write(bimage, "png", imOut);
// 存储原图到数据库
imageService.uploadTempLogo(new ByteArrayInputStream(bs.toByteArray()), userId);
} catch (IOException e) {
Logger.error("上传随机头像出错", e);
e.printStackTrace();
}
if (!thumbnailSizeList.isEmpty()) {
// 生成切割小图片，存入数据库
imageService.rectAndStoreAvatar(
userId, 0, 0, width, height, thumbnailSizeList, AvatarIdGenerator.USER_TYPE);
}
}
/**
* 获取不存在的头像尺寸
*
* @param userId
* @return
*/
private List<Double> obtainThumbnailSizeList(String userId) {
List<Double> list = new ArrayList<Double>();
GridFSDBFile intinalAvatarFile = null;
for (Double size : SnapFileConfigUtils.obtainAvatarScaleSizes()) {
intinalAvatarFile =
imageStoreService.get(AvatarIdGenerator.genegratorUserAvatarId(userId, size));
if (intinalAvatarFile == null) {
list.add(size);
}
}
return list;
}