使用Java中的服务帐户访问网络上的文件 [英] Accessing File Over A Network Using Service Account in Java

问题描述

我正在尝试使用Java从网络位置读取文件。问题是访问该网络位置需要特定的凭据。

I am trying to read a file from a network location using Java.The problem is that the access to that network location requires specific credentials.

有没有办法在Java中指定这些凭据，然后通过网络访问teh文件。

Is there any way to specify these credentials in Java and then access teh file over the network.

我正在尝试从我在Weblogic上运行的Web应用程序执行此操作

I am trying to do this from my web application which is running on Weblogic

谢谢，
Abhishek

Thanks, Abhishek

推荐答案

以下是示例代码。

try {
        URL url  = new URL("https://www.visruthcv.appspot.com");
        URLConnection con = url.openConnection();

        HttpURLConnection httpUrlConnection = (HttpURLConnection) con;
        httpUrlConnection.setReadTimeout(10000);
        httpUrlConnection.setConnectTimeout(15000);
        httpUrlConnection.setRequestMethod("POST");
        httpUrlConnection.setDoInput(true);
        httpUrlConnection.setDoOutput(true);

        /*
         * for request headers
         */
        httpUrlConnection.setRequestProperty("Accept",
                "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        httpUrlConnection.setRequestProperty("Accept-Charset",
                "ISO-8859-1,utf-8;q=0.7,*;q=0.3");
        httpUrlConnection.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
        httpUrlConnection.setRequestProperty("Accept-Language", "en-US,en;q=0.8");
        httpUrlConnection.setRequestProperty("Connection", "keep-alive");


        /*
         * for adding request parameters
         */
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("username", "Visruth");
        params.put("password", "passwd");

        OutputStream os = httpUrlConnection.getOutputStream();
        BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(os, "UTF-8"));
        writer.write(getQuery(params));
        writer.flush();
        writer.close();
        os.close();

        httpUrlConnection.connect();

        // To write to a file, something like this
        InputStream is = httpUrlConnection.getInputStream();
        FileOutputStream fos = new FileOutputStream("/home/visruth/Desktop/photo2.jpg");
        int i = 0;
        byte[] b = new byte[1024];

        while((i = is.read(b)) != -1) {
            fos.write(b, 0, i);
        }

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (ProtocolException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

制作查询字符串：

//make needful changes for this method if any parameter has multiple values, eg: usernames = "Visruth", usernames = "visruth CV" and etc..
private static String getQuery(Map<String, Object> params)
            throws UnsupportedEncodingException {
        StringBuilder result = new StringBuilder();
        boolean first = true;

        for (Entry<String, Object> pair : params.entrySet() ) {


            if (first) {
                first = false;
            } else {
                result.append("&");
            }


            result.append(URLEncoder.encode(pair.getKey(), "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(pair.getValue().toString(), "UTF-8"));
        }

        return result.toString();
    }

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