java 通过url取得文件返回InputStream类型数据的工具类

/**
* 通过url取得文件返回InputStream类型数据
* @author gugf
*
*/
public class HttpUtils {

/**
* 通过图片url返回图片Bitmap
* @param url
* @return
*/
public static InputStream returnBitMap(String path) {
URL url = null;
InputStream is =null;
try {
url = new URL(path);
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
HttpURLConnection conn = (HttpURLConnection) url.openConnection();//利用HttpURLConnection对象,我们可以从网络中获取网页数据.
conn.setDoInput(true);
conn.connect();
is = conn.getInputStream();	//得到网络返回的输入流

} catch (IOException e) {
e.printStackTrace();
}
return is;
}
}

StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads().detectDiskWrites().detectNetwork()
.penaltyLog().build());
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects().penaltyLog().penaltyDeath()
.build());