error handling, excel, bug fixes, name fixes (#57)

src/main/java/stirling/software/SPDF/utils/ErrorUtils.java

@@ -0,0 +1,32 @@
+package stirling.software.SPDF.utils;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import org.springframework.ui.Model;
+import org.springframework.web.servlet.ModelAndView;
+
+public class ErrorUtils {
+
+    public static Model exceptionToModel(Model model, Exception ex) {
+        StringWriter sw = new StringWriter();
+        ex.printStackTrace(new PrintWriter(sw));
+        String stackTrace = sw.toString();
+
+        model.addAttribute("errorMessage", ex.getMessage());
+        model.addAttribute("stackTrace", stackTrace);
+        return model;
+    }
+
+    public static ModelAndView exceptionToModelView(Model model, Exception ex) {
+        StringWriter sw = new StringWriter();
+        ex.printStackTrace(new PrintWriter(sw));
+        String stackTrace = sw.toString();
+
+        ModelAndView modelAndView = new ModelAndView();
+        modelAndView.addObject("errorMessage", ex.getMessage());
+        modelAndView.addObject("stackTrace", stackTrace);
+        return modelAndView;
+    }
+    
+}

src/main/java/stirling/software/SPDF/utils/PdfUtils.java

@@ -29,6 +29,9 @@ import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 
+import com.itextpdf.text.Document;
+import com.itextpdf.text.DocumentException;
+import com.itextpdf.text.pdf.PdfWriter;
 import com.spire.pdf.PdfDocument;
 
 public class PdfUtils {
@@ -157,6 +160,18 @@ public class PdfUtils {
         }
     }
 
+    public static ResponseEntity<byte[]> iTextDocToWebResponse(Document document, String docName) throws IOException, DocumentException {
+        // Close the document
+        document.close();
+        
+        // Open Byte Array and save document to it
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        PdfWriter.getInstance(document, baos).close();
+        
+
+        return PdfUtils.boasToWebResponse(baos, docName);
+    }
+    
     public static ResponseEntity<byte[]> pdfDocToWebResponse(PdfDocument document, String docName) throws IOException {
 
         // Open Byte Array and save document to it