conn.getInputStream()报错：java.io.FileNotFoundException

[zjc_137]

这是错误信息：
java.io.FileNotFoundException: http://csfile.oss-cn-hangzhou.aliyuncs.com/person_photo/1080Pickford.jpg?Expires=4601247959&OSSAccessKeyId=ZMQayXeY7ZLaB0BH&Signature=wVZdWcWvWRQdZdZmoIFbhQ8Mx1I%3D
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1872)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
at javaapplication1.util.DownloadPic(util.java:233)
at javaapplication1.sql.json_sql1(sql.java:127)
at javaapplication1.data_match_person.data_match_person_guest(data_match_person.java:62)
at javaapplication1.timer$1.run(timer.java:74)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

下面是代码：
URL url = new URL(strUr1);
String pic_name = find_pic_name(strUr1);
URLConnection conn = url.openConnection();
fStream = conn.getInputStream();
int b = 0;
fos = new FileOutputStream(new File(config.pic_path+pic_name));
byte[] bt = new byte[1024];
while ((b=fStream.read(bt))!=-1) {
fos.write(bt, 0, b);
}
fos.close();
fStream.close();

问题是我下载png的图片是可以的，下载jpg图片的时候就报错了，都是一个方法下载的一到fStream = conn.getInputStream();这里就报错。
百度了好久了都不行，用户代理、编码都加了
那位大神来帮忙解决下。。。谢谢！

[zjc_137]

那位大神来帮助我一下