base64的图片格式在存储时是很占空间的，所以上传服务器后保存图片链接是个很不错的选择；代码如下：
public String uploadImg(String baseImg){
String url = "";
try {
String rootPath = "";
String path = "";
String random = "";
try {
//对于base64格式的图片，要去掉开头的部分
int dex = baseImg.indexOf("base64,");
baseImg = baseImg.substring(dex + 7);
//将图片信息转换为字节数组
byte[] arr = Base64Decoder.decodeToBytes(baseImg);
random = UUID.randomUUID().toString() + ".jpg";
String root = PathKit.getWebRootPath();
path = "/upload/";
rootPath = root + path;
File targetDir = new File(rootPath);
if (!targetDir.exists()) {
targetDir.mkdirs();
}
OutputStream out = new FileOutputStream(rootPath + random);
//循环写出，确保文件写完
for (int i = 0; i < arr.length; i++) {
out.write(arr[i]);// 逐字节写文件
}
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
//测试地址（地址自定义）
url = "http://localhost:8080/kd_admin/upload/"+ random;
} catch (Exception e) {
url = null;
e.printStackTrace();
}
return url;
}
