java判断远程文件是否存在

boolean isExist = false;
try{
URL url = new URL(urlStr);// 注：urlStr中需将空格替换为%20,否则报505
URLConnection conn = url.openConnection();
conn.getInputStream();
isExist  = true;
}catch(Exception e){
// 获取失败
isExist = false;
}

boolean isExist = false;
try{
URL url = new URL(urlStr);// 注：urlStr中需将空格替换为%20,否则报505
HttpURLConnection conn = (HttpURLConnection ) url.openConnection();
int state = conn.getResponseCode();
if(state == 200){
isExist  = true;
}else{
isExist  = false
}
}catch(Exception e){
isExist = false;
}