Java, FileNotfound Exception, While reading conn.getInputStream()

Question

Please tell me some one, How to resolve this problem, Sometime I am getting Filenotfound Exception and Some time this code working fine.

Below is my code,

public String sendSMS(String data, String url1) {
            URL url;

            String status = "Somthing wrong ";
            try {
                url = new URL(url1);
                URLConnection conn = url.openConnection();
                conn.setDoOutput(true);
                conn.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
                conn.setRequestProperty("Accept","*/*");
                OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
                wr.write(data);
                wr.flush();

                // Get the response
                try {
                    BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                    String s;
                    while ((s = rd.readLine()) != null) {
                        status = s;
                    }
                    rd.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }

                wr.close();

            } catch (MalformedURLException e) {
                status = "MalformedURLException Exception in sendSMS";
                e.printStackTrace();
            } catch (IOException e) {
                status = "IO Exception in sendSMS";
                e.printStackTrace();
            }

            return status;
        }

Can you show the stacktrace and the error message you get. – CloudyMarble Jan 29 '13 at 12:07 — CloudyMarble, Jan 29 '13 at 12:07
What is the value of `url1`? – Shashank Kadne Jan 29 '13 at 12:13 — Shashank Kadne, Jan 29 '13 at 12:13
Do you see "Too many open files" in message of exception? – partlov Jan 29 '13 at 12:13 — partlov, Jan 29 '13 at 12:13
try writing wr.close(); immediately after wr.flush() – Bhavik Shah Jan 29 '13 at 12:14 — Bhavik Shah, Jan 29 '13 at 12:14

xagyg · Answer 1 · 2013-01-29T13:23:36.513

Rewrite like this and let me know how you go... (note closing of reading and writing streams, also the cleanup of streams if an exception is thrown).

public String sendSMS(String data, String url1) {
    URL url;
    OutputStreamWriter wr = null;
    BufferedReader rd = null;

    String status = "Somthing wrong ";

    try {

        url = new URL(url1);
        URLConnection conn = url.openConnection();
        conn.setDoOutput(true);
        conn.setRequestProperty("User-Agent","Mozilla/5.0 ( compatible ) ");
        conn.setRequestProperty("Accept","*/*");

        wr = new OutputStreamWriter(conn.getOutputStream());
        wr.write(data);
        wr.flush();
        wr.close();

        rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String s;
        while ((s = rd.readLine()) != null) {
            status = s;
        }
        rd.close();                

    } catch (Exception e) {
        if (wr != null) try { wr.close(); } catch (Exception x) {/*cleanup*/}
        if (rd != null) try { rd.close(); } catch (Exception x) {/*cleanup*/}
        e.printStackTrace();
    }    

    return status;
}

score 1 · Answer 2 · edited May 23 '17 at 11:51

This issue seems to be known, but for different reasons so its not clear why this happend.

Some threads would recommend closing the OutputStreamWriter as flushing it is not enough, therefor i would try to clos it directly after fushing as you are not using it in the code between the flush and close.

Other threads show that using a different connections like HttpURLConnection are avoiding this problem from occuring (Take a look here)

Another article suggests to use the URLEncoder class’ static method encode. This method takes a string and encodes it to a string that is ok to put in a URL.

Some similar questions:

URL is accessable with browser but still FileNotFoundException with URLConnection

URLConnection FileNotFoundException for non-standard HTTP port sources

URLConnection throwing FileNotFoundException

Wish you good luck.

score 0 · Answer 3 · answered Jan 28 '14 at 16:12

0

It returns FileNotFoundException when the server response to HTTP request is code 404.

Check your URL.

answered Jan 28 '14 at 16:12

Chocksmith

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Java, FileNotfound Exception, While reading conn.getInputStream()

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