Java，FileNotfound 异常，读取 conn.getInputStream() 时

Question

请告诉我一个，如何解决这个问题， 有时我收到 Filenotfound 异常，有时这段代码工作正常。

下面是我的代码，

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;
        }

Answer 1

像这样重写，让我知道你的进展......(注意关闭读写流，如果抛出异常，还要清理流)。

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;
}