Java读取远程服务器上的txt文件

public String ReadUrl(String FileName) throws IOException{
 2    String read;
 3    String readStr ="";
 4 try{
 5    URL   url   =new   URL(FileName);
 6       HttpURLConnection   urlCon   =   (HttpURLConnection)url.openConnection();
 7       urlCon.setConnectTimeout(5000);
 8       urlCon.setReadTimeout(5000);
 9    BufferedReader br =new BufferedReader(new InputStreamReader( urlCon.getInputStream()));
10 while ((read = br.readLine()) !=null) {
11               readStr = readStr + read;
12      }
13      br.close();
14    }
15 catch (IOException e) {
16 // TODO Auto-generated catch block
17    readStr ="f";
18   }
19 return readStr;
20   }
21