(其實常常發生XD, 因為http下載檔案的URL可能常常被變更, 所以只要下載有問題時, 都會第一時間照慣例去檢查URL有沒有異動)
但是這次URL變更, 只是從http改成https, 只是多了s讓我找了好苦阿(這時候就覺得瀏覽器聰明多了, 會自己去導向https)
不過呢, 程式有寫try catch, 理應會回傳錯誤訊息, 但是程式卻沒catch到而讓它pass,
經過debug檢查後, 才發現它download下來的是一個"空"的檔案, 所以程式認為有download成功才讓它pass吧!?
我是在程式裡面加了get HTTP status來debug, 發現這case的HTTP status是301(不是常見的403, 404)
這類status似乎是不會被catch!?
boolean downloadUrlFile(String urlpath, String filepath){
try {
String proxyURL="proxy.google.com.tw";
String proxyPort="3128";
SocketAddress sa = new InetSocketAddress( proxyURL , Integer.parseInt( proxyPort ) );
Proxy proxy = new Proxy(Proxy.Type.HTTP, sa);
URL url = new URL(urlpath);
//URLConnection conn = url.openConnection(proxy);
HttpURLConnection conn = (HttpURLConnection)url.openConnection(proxy);
conn.setConnectTimeout(60000); //60sec, default: 15sec
conn.setReadTimeout(90000); //90sec, default: 60sec
conn.connect();
/* Check Http Status*/
int status = conn.getResponseCode();
System.out.println(status);
switch (status) {
case java.net.HttpURLConnection.HTTP_GATEWAY_TIMEOUT://504
System.out.println("連線網址逾時!");
break;
case java.net.HttpURLConnection.HTTP_FORBIDDEN://403
System.out.println("連線網址禁止!");
break;
case java.net.HttpURLConnection.HTTP_INTERNAL_ERROR://500
System.out.println("連線網址錯誤或不存在!");
break;
case java.net.HttpURLConnection.HTTP_NOT_FOUND://404
System.out.println("連線網址不存在!");
break;
case java.net.HttpURLConnection.HTTP_OK:
System.out.println("OK!");
break;
}
java.io.BufferedInputStream in = new java.io.BufferedInputStream(conn.getInputStream());
java.io.FileOutputStream fos = new java.io.FileOutputStream(filepath);
java.io.BufferedOutputStream bout = new BufferedOutputStream(fos,1024);
byte[] data = new byte[1024];
int x=0;
while((x=in.read(data,0,1024))>=0)
{
bout.write(data,0,x);
}
bout.close();
in.close();
}catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
