자바 원 격 파일 존재 여부 판단(크로스 서버)

1.getInputStream()사용

boolean isExist = false;
try{
	URL url = new URL(urlStr);//  ：urlStr        %20,   505
	URLConnection conn = url.openConnection();
	conn.getInputStream();
	isExist  = true;
}catch(Exception e){
	//     
	isExist = false;
}

2.getResponseCode()사용

boolean isExist = false;
try{
	URL url = new URL(urlStr);//  ：urlStr        %20,   505
	HttpURLConnection conn = (HttpURLConnection ) url.openConnection();
	int state = conn.getResponseCode();
    if(state == 200){
	    isExist  = true;
    }else{
	    isExist  = false
    }
}catch(Exception e){
	isExist = false;
}