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POProblems when sending XML data from HTTP Java client to a servlet with HttpURLConnection
 

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    <p>I have standalone java client sending xml data to http servlet using httpURLconnection class.but data appearing in non printable character format.</p> <p>For simulation i have been trying to send simple string but still it was appearing in non printable format.</p> <p>I have written the following client code to communicate with servlet,</p> <pre><code>import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.ProtocolException; import java.net.URL; public class HttpClient implements IClient { private static IClient client = null; private HttpURLConnection httpConn = null; private OutputStream output = null; private InputStream input = null; private OutputStreamWriter out = null; private HttpClient() { } public static IClient getHttpClient() { if (client == null) { client = new HttpClient(); } return client; } @Override public void connect(String urlString) throws IOException { URL url = new URL(urlString); httpConn = (HttpURLConnection) url.openConnection(); initConnection(); httpConn.connect(); output = httpConn.getOutputStream(); input = httpConn.getInputStream(); System.out.println("Connection Response:" + httpConn.getResponseCode()); } @Override public void sendFile(File file) throws IOException { // BufferedOutputStream bos = new BufferedOutputStream(output); // InputStream fis = new FileInputStream(file); // int bytesRead = 0; // byte[] buffer = new byte[8192]; // while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) { // bos.write(buffer, 0, bytesRead); // System.out.println("write:"+buffer); // } // bos.close(); // fis.close(); OutputStreamWriter out = new OutputStreamWriter(output, "UTF-16"); out.write("test me"); } @Override public boolean isConnected() { return httpConn != null ? true : false; } @Override public void close() { httpConn.disconnect(); } private void initConnection() throws ProtocolException { httpConn.setDoOutput(true); httpConn.setDoInput(true); httpConn.setRequestMethod("POST"); httpConn.setUseCaches(false); httpConn.setRequestProperty("Content-Type", "text/xml; charset=\"UTF-16\""); httpConn.setRequestProperty("Connection", "Keep-Alive"); } private static byte[] getBytesFromFile(File file) throws IOException { InputStream is = new FileInputStream(file); System.out.println("\nDEBUG: FileInputStream is " + file); // Get the size of the file long length = file.length(); System.out.println("DEBUG: Length of " + file + " is " + length + "\n"); /* * You cannot create an array using a long type. It needs to be an int * type. Before converting to an int type, check to ensure that file is * not loarger than Integer.MAX_VALUE; */ if (length &gt; Integer.MAX_VALUE) { System.out.println("File is too large to process"); return null; } // Create the byte array to hold the data byte[] bytes = new byte[(int) length]; // Read in the bytes int offset = 0; int numRead = 0; while ((offset &lt; bytes.length) &amp;&amp; ((numRead = is.read(bytes, offset, bytes.length - offset)) &gt;= 0)) { offset += numRead; } // Ensure all the bytes have been read in if (offset &lt; bytes.length) { throw new IOException("Could not completely read file " + file.getName()); } return bytes; } } </code></pre> <p>and servlet code is given below,</p> <pre><code>import java.io.BufferedInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class XMLServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doPost(req, resp); } protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { System.out.println("=========inside doPost========="); // BufferedInputStream bis = new BufferedInputStream(req.getInputStream()); // OutputStream fos = new FileOutputStream("test.xml"); // int bytesRead = 0; // byte[] buffer = new byte[8192]; // while ((bytesRead = bis.read(buffer, 0, 8192)) != -1) { // System.out.println("read:"+buffer); // fos.write(buffer, 0, bytesRead); // } // fos.close(); // bis.close(); // req.setCharacterEncoding("UTF-16"); InputStreamReader isr = new InputStreamReader(req.getInputStream(),"UTF-16"); char[] data = new char[10]; isr.read(data); System.out.println(data); for (char c : data) { System.out.println(c); } } } </code></pre> <p>Please any help me to get out of this problem.</p>
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    1. USSharad Ahire
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    1. COI liked `return httpConn != null ? true : false;` :)
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      1. POProblems when sending XML data from HTTP Java client to a servlet with HttpURLConnection
      1. USkhachik
    2. COThat can indeed be simplified as `return httpConn != null;`
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      1. USBalusC
 

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