--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/de/mpiwg/gazetteer/rest/AbstractServletMethod.java	Thu Apr 23 15:46:01 2015 +0200
@@ -0,0 +1,104 @@
+package de.mpiwg.gazetteer.rest;
+
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintWriter;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.Part;
+
+import org.apache.commons.lang.StringUtils;
+import org.apache.log4j.Logger;
+import org.json.JSONObject;
+
+
+public abstract class AbstractServletMethod {
+	
+	private static Logger LOGGER = Logger.getLogger(AbstractServletMethod.class);
+
+	
+	
+	protected static void writeError(HttpServletResponse response, String message){
+		try {
+			JSONObject json = new JSONObject();
+			json.put("status", "error");
+			json.put("message", message);
+			
+			PrintWriter out = response.getWriter();
+			out.print(json.toString());
+			out.flush();
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+	
+	protected static Long getQueryLongParam(HttpServletRequest request, String paraName) {
+		String value = request.getParameter(paraName);
+		if (StringUtils.isNotEmpty(value)) {
+			try {
+				return Long.parseLong(value);
+			} catch (Exception e) {
+			}
+		}
+		return null;
+	}
+	
+	protected static Long getRequestLongPart(HttpServletRequest request, String partName) throws IOException,
+			IllegalStateException, ServletException {
+		
+		String value = getRequestPart(request, partName);
+		
+		try {
+			Long v = Long.parseLong(value);
+			return v;
+		} catch (Exception e) {
+		}
+		
+		return null;
+		
+	}
+
+	protected static String getRequestPart(HttpServletRequest request, String partName) throws IOException,
+			IllegalStateException, ServletException {
+
+		String partText = null;
+		final Part filePart = request.getPart(partName);
+
+		if (filePart != null) {
+			OutputStream out = null;
+			InputStream filecontent = null;
+
+			try {
+				out = new ByteArrayOutputStream();
+				filecontent = filePart.getInputStream();
+
+				int read = 0;
+				final byte[] bytes = new byte[1024];
+
+				while ((read = filecontent.read(bytes)) != -1) {
+					out.write(bytes, 0, read);
+				}
+
+				partText = out.toString();
+
+			} catch (FileNotFoundException fne) {
+				LOGGER.info("Problems during file upload. Error: " + fne.getMessage());
+			} finally {
+				if (out != null) {
+					out.close();
+				}
+				if (filecontent != null) {
+					filecontent.close();
+				}
+			}
+		}
+
+		return partText;
+	}
+	
+}