Update src/info/sudr/file/UploadServlet.java

1) init() method: 
I fixed a bug (?) in the init() to the fileUploadPath  initialization.
In my localhost execution the item.write(file); in doPost method throwed an exception.
Now with the correct realPath it's ok.

2) doGet() method
In the doGet method I add the feature to list all the uploaded files, already uploaded in the uploadedFolder.

Author: paolobiavati

src/info/sudr/file/UploadServlet.java

@@ -25,7 +25,9 @@ public class UploadServlet extends HttpServlet {
 
     @Override
     public void init(ServletConfig config) {
-        fileUploadPath = new File(config.getInitParameter("upload_path"));
+    	//
+		// I fixed the uploadpath with the right realPath
+		fileUploadPath = new File(config.getServletContext().getRealPath(config.getInitParameter("upload_path")));
     }
 
     /**
@@ -93,8 +95,37 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response) t
                     }
             } // TODO: check and report success
         } else {
-            PrintWriter writer = response.getWriter();
-            writer.write("call POST with multipart form data");
+    		//
+			// return the list of all files in the upload folder
+			PrintWriter writer = response.getWriter();
+			response.setContentType("application/json");
+			JSONArray json = new JSONArray();
+
+			try {
+				//
+				// loop all files in the folder
+				File[] fileList = fileUploadPath.listFiles();
+				if (fileList != null) {
+					for (File f : fileList) {
+						if (f.isFile()) {
+							JSONObject jsono = new JSONObject();
+							jsono.put("name", f.getName());
+							jsono.put("size", f.length());
+							jsono.put("url", "upload?getfile=" + f.getName());
+							jsono.put("thumbnail_url", "upload?getthumb=" + f.getName());
+							jsono.put("delete_url", "upload?delfile=" + f.getName());
+							jsono.put("delete_type", "GET");
+							json.put(jsono);
+
+						}
+					}
+				}
+			} catch (Exception e) {
+				throw new RuntimeException(e);
+			} finally {
+				writer.write(json.toString());
+				writer.close();
+			}
         }
     }