Java tutorial
/* * Copyright (C) 2005-2010 Alfresco Software Limited. * * This file is part of Alfresco * * Alfresco is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Alfresco is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with Alfresco. If not, see <http://www.gnu.org/licenses/>. */ package de.fme.alfresco.repo.web.scripts; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.StringWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern; import org.alfresco.repo.content.MimetypeMap; import org.alfresco.service.cmr.dictionary.DictionaryService; import org.alfresco.service.cmr.dictionary.PropertyDefinition; import org.alfresco.service.namespace.QName; import org.alfresco.util.Pair; import org.apache.commons.csv.CSVPrinter; import org.apache.commons.csv.CSVStrategy; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.ClientAnchor; import org.apache.poi.ss.usermodel.Comment; import org.apache.poi.ss.usermodel.Drawing; import org.apache.poi.ss.usermodel.Font; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import org.springframework.extensions.webscripts.DeclarativeWebScript; import org.springframework.extensions.webscripts.Status; import org.springframework.extensions.webscripts.WebScriptException; import org.springframework.extensions.webscripts.WebScriptRequest; import org.springframework.extensions.webscripts.WebScriptResponse; /** * Parent of Declarative Webscripts that generate Excel files, * usually based on some sort of dictionary model. * * @author Nick Burch, Jan Pfitzner */ public abstract class DeclarativeSpreadsheetWebScript extends DeclarativeWebScript { public static final String MODEL_CSV = "csv"; public static final String MODEL_EXCEL = "excel"; protected DictionaryService dictionaryService; protected String filenameBase; /** * @param dictionaryService the DictionaryService to set */ public void setDictionaryService(DictionaryService dictionaryService) { this.dictionaryService = dictionaryService; } /** * Identifies the resource for the webscript. */ protected abstract Object identifyResource(String format, WebScriptRequest req); /** * If the format is requested as HTML, should an exception be raised, * or should an HTML version be called? */ protected abstract boolean allowHtmlFallback(); /** * Returns the QNames of the model properties to be output in * the header, and if they're required or not */ protected abstract List<Pair<QName, Boolean>> buildPropertiesForHeader(Object resource, String format, WebScriptRequest req); /** * Populates the body of the Excel Workbook, once the header has been * output. * This is called if the format is .xls or .xlsx */ protected abstract void populateBody(Object resource, Workbook workbook, Sheet sheet, List<QName> properties) throws IOException; /** * Populates the body of the CSV file, once the header has been * output. * This is called if the format is .csv */ protected abstract void populateBody(Object resource, CSVPrinter csv, List<QName> properties) throws IOException; /** * @see org.alfresco.web.scripts.DeclarativeWebScript#executeImpl(org.alfresco.web.scripts.WebScriptRequest, org.alfresco.web.scripts.Status) */ @Override protected Map<String, Object> executeImpl(WebScriptRequest req, Status status) { Map<String, Object> model = new HashMap<String, Object>(); model.put("success", Boolean.TRUE); // What format are they after? String format = req.getFormat(); if ("csv".equals(format) || "xls".equals(format) || "xlsx".equals(format) || "excel".equals(format)) { // Identify the thing to process Object resource = identifyResource(format, req); // Generate the spreadsheet try { generateSpreadsheet(resource, format, req, status, model); return model; } catch (IOException e) { throw new WebScriptException(Status.STATUS_BAD_REQUEST, "Unable to generate template file", e); } } // If we get here, then it isn't a spreadsheet version if (allowHtmlFallback()) { // There's some sort of help / upload form return model; } else { throw new WebScriptException("Web Script format '" + format + "' is not supported"); } } /** * Generates the spreadsheet, based on the properties in the header * and a callback for the body. */ public void generateSpreadsheet(Object resource, String format, WebScriptRequest req, Status status, Map<String, Object> model) throws IOException { Pattern qnameMunger = Pattern.compile("([A-Z][a-z]+)([A-Z].*)"); // Build up the details of the header List<Pair<QName, Boolean>> propertyDetails = buildPropertiesForHeader(resource, format, req); String[] headings = new String[propertyDetails.size()]; String[] descriptions = new String[propertyDetails.size()]; boolean[] required = new boolean[propertyDetails.size()]; for (int i = 0; i < headings.length; i++) { Pair<QName, Boolean> property = propertyDetails.get(i); if (property == null || property.getFirst() == null) { headings[i] = ""; required[i] = false; } else { QName column = property.getFirst(); required[i] = property.getSecond(); // Ask the dictionary service nicely for the details PropertyDefinition pd = dictionaryService.getProperty(column); if (pd != null && pd.getTitle() != null) { // Use the friendly titles, which may even be localised! headings[i] = pd.getTitle(); descriptions[i] = pd.getDescription(); } else { // Nothing friendly found, try to munge the raw qname into // something we can show to a user... String raw = column.getLocalName(); raw = raw.substring(0, 1).toUpperCase() + raw.substring(1); Matcher m = qnameMunger.matcher(raw); if (m.matches()) { headings[i] = m.group(1) + " " + m.group(2); } else { headings[i] = raw; } } } } // Build a list of just the properties List<QName> properties = new ArrayList<QName>(propertyDetails.size()); for (Pair<QName, Boolean> p : propertyDetails) { QName qn = null; if (p != null) { qn = p.getFirst(); } properties.add(qn); } // Output if ("csv".equals(format)) { StringWriter sw = new StringWriter(); CSVPrinter csv = new CSVPrinter(sw, CSVStrategy.EXCEL_STRATEGY); csv.println(headings); populateBody(resource, csv, properties); model.put(MODEL_CSV, sw.toString()); } else { Workbook wb; if ("xlsx".equals(format)) { wb = new XSSFWorkbook(); // TODO Properties } else { wb = new HSSFWorkbook(); // TODO Properties } // Add our header row Sheet sheet = wb.createSheet("Export"); Row hr = sheet.createRow(0); try { sheet.createFreezePane(0, 1); } catch (IndexOutOfBoundsException e) { //https://issues.apache.org/bugzilla/show_bug.cgi?id=51431 & http://stackoverflow.com/questions/6469693/apache-poi-clearing-freeze-split-panes } Font fb = wb.createFont(); fb.setBoldweight(Font.BOLDWEIGHT_BOLD); Font fi = wb.createFont(); fi.setBoldweight(Font.BOLDWEIGHT_BOLD); fi.setItalic(true); CellStyle csReq = wb.createCellStyle(); csReq.setFont(fb); CellStyle csOpt = wb.createCellStyle(); csOpt.setFont(fi); // Populate the header Drawing draw = null; for (int i = 0; i < headings.length; i++) { Cell c = hr.createCell(i); c.setCellValue(headings[i]); if (required[i]) { c.setCellStyle(csReq); } else { c.setCellStyle(csOpt); } if (headings[i].length() == 0) { sheet.setColumnWidth(i, 3 * 250); } else { sheet.setColumnWidth(i, 18 * 250); } if (descriptions[i] != null && descriptions[i].length() > 0) { // Add a description for it too if (draw == null) { draw = sheet.createDrawingPatriarch(); } ClientAnchor ca = wb.getCreationHelper().createClientAnchor(); ca.setCol1(c.getColumnIndex()); ca.setCol2(c.getColumnIndex() + 1); ca.setRow1(hr.getRowNum()); ca.setRow2(hr.getRowNum() + 2); Comment cmt = draw.createCellComment(ca); cmt.setAuthor(""); cmt.setString(wb.getCreationHelper().createRichTextString(descriptions[i])); cmt.setVisible(false); c.setCellComment(cmt); } } // Have the contents populated populateBody(resource, wb, sheet, properties); // Save it for the template ByteArrayOutputStream baos = new ByteArrayOutputStream(); wb.write(baos); model.put(MODEL_EXCEL, baos.toByteArray()); } } @Override protected Map<String, Object> createTemplateParameters(WebScriptRequest req, WebScriptResponse res, Map<String, Object> customParams) { Map<String, Object> model = super.createTemplateParameters(req, res, customParams); // We sometimes need to monkey around to do the binary output... model.put("req", req); model.put("res", res); model.put("writeExcel", new WriteExcel(res, model, req.getFormat(), filenameBase)); return model; } public static class WriteExcel { private String format; private String filenameBase; private WebScriptResponse res; private Map<String, Object> model; private WriteExcel(WebScriptResponse res, Map<String, Object> model, String format, String filenameBase) { this.res = res; this.model = model; this.format = format; this.filenameBase = filenameBase; } public void write() throws IOException { String filename = filenameBase + "." + format; // If it isn't a CSV, reset so we can send binary if (!"csv".equals(format)) { res.reset(); } // Tell the browser it's a file download res.addHeader("Content-Disposition", "attachment; filename=" + filename); // Now send that data if ("csv".equals(format)) { res.getWriter().append((String) model.get(MODEL_CSV)); } else { // Set the mimetype, as we've reset if ("xlsx".equals(format)) { res.setContentType(MimetypeMap.MIMETYPE_OPENXML_SPREADSHEET); } else { res.setContentType(MimetypeMap.MIMETYPE_EXCEL); } // Send the raw excel bytes byte[] excel = (byte[]) model.get(MODEL_EXCEL); res.getOutputStream().write(excel); } } } }