Java tutorial
package com.catdog.common.util; import java.io.FileOutputStream; /* ==================================================================== Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. ==================================================================== */ import java.io.IOException; import java.io.InputStream; import java.io.PrintStream; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.regex.Pattern; import javax.xml.parsers.ParserConfigurationException; import javax.xml.parsers.SAXParser; import javax.xml.parsers.SAXParserFactory; import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.openxml4j.exceptions.OpenXML4JException; import org.apache.poi.openxml4j.opc.OPCPackage; import org.apache.poi.openxml4j.opc.PackageAccess; import org.apache.poi.ss.usermodel.BuiltinFormats; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.DataFormatter; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.util.CellReference; import org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable; import org.apache.poi.xssf.eventusermodel.XSSFReader; import org.apache.poi.xssf.model.StylesTable; import org.apache.poi.xssf.streaming.SXSSFSheet; import org.apache.poi.xssf.streaming.SXSSFWorkbook; import org.apache.poi.xssf.usermodel.XSSFCellStyle; import org.apache.poi.xssf.usermodel.XSSFRichTextString; import org.xml.sax.Attributes; import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader; import org.xml.sax.helpers.DefaultHandler; /** * CVS?XLSX?? * ?POI?????????Sheet? * ,??Excel? FileInputStream file=new * FileInputStream("c:\\test.xlsx"); Workbook wb=new XSSFWorkbook(file); * * * @author */ public class ExcelReadAndWrite { /** * The type of the data value is indicated by an attribute on the cell. The * value is usually in a "v" element within the cell. */ enum xssfDataType { BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER, } /** * xssf_sax_API?Excel,? * <p/> * Also see Standard ECMA-376, 1st edition, part 4, pages 1928ff, at * http://www.ecma-international.org/publications/standards/Ecma-376.htm * <p/> * A web-friendly version is http://openiso.org/Ecma/376/Part4 */ class MyXSSFSheetHandler extends DefaultHandler { /** * Table with styles */ private StylesTable stylesTable; /** * Table with unique strings */ private ReadOnlySharedStringsTable sharedStringsTable; /** * Destination for data */ private final PrintStream output; /** * Number of columns to read starting with leftmost */ private final int minColumnCount; // Set when V start element is seen private boolean vIsOpen; // Set when cell start element is seen; // used when cell close element is seen. private xssfDataType nextDataType; // Used to format numeric cell values. private short formatIndex; private String formatString; private final DataFormatter formatter; private int thisColumn = -1; // The last column printed to the output stream private int lastColumnNumber = -1; // Gathers characters as they are seen. private StringBuffer value; private String[] record; private List<String[]> rows = new ArrayList<String[]>(); private boolean isCellNull = false; /** * Accepts objects needed while parsing. * * @param styles * Table of styles * @param strings * Table of shared strings * @param cols * Minimum number of columns to show * @param target * Sink for output */ public MyXSSFSheetHandler(StylesTable styles, ReadOnlySharedStringsTable strings, int cols, PrintStream target) { this.stylesTable = styles; this.sharedStringsTable = strings; this.minColumnCount = cols; this.output = target; this.value = new StringBuffer(); this.nextDataType = xssfDataType.NUMBER; this.formatter = new DataFormatter(); record = new String[this.minColumnCount]; rows.clear();// ??? } /* * (non-Javadoc) * * @see * org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, * java.lang.String, java.lang.String, org.xml.sax.Attributes) */ public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException { if ("inlineStr".equals(name) || "v".equals(name)) { vIsOpen = true; // Clear contents cache value.setLength(0); } // c => cell else if ("c".equals(name)) { // Get the cell reference String r = attributes.getValue("r"); int firstDigit = -1; for (int c = 0; c < r.length(); ++c) { if (Character.isDigit(r.charAt(c))) { firstDigit = c; break; } } thisColumn = nameToColumn(r.substring(0, firstDigit)); // Set up defaults. this.nextDataType = xssfDataType.NUMBER; this.formatIndex = -1; this.formatString = null; String cellType = attributes.getValue("t"); String cellStyleStr = attributes.getValue("s"); if ("b".equals(cellType)) nextDataType = xssfDataType.BOOL; else if ("e".equals(cellType)) nextDataType = xssfDataType.ERROR; else if ("inlineStr".equals(cellType)) nextDataType = xssfDataType.INLINESTR; else if ("s".equals(cellType)) nextDataType = xssfDataType.SSTINDEX; else if ("str".equals(cellType)) nextDataType = xssfDataType.FORMULA; else if (cellStyleStr != null) { // It's a number, but almost certainly one // with a special style or format int styleIndex = Integer.parseInt(cellStyleStr); XSSFCellStyle style = stylesTable.getStyleAt(styleIndex); this.formatIndex = style.getDataFormat(); this.formatString = style.getDataFormatString(); if (this.formatString == null) this.formatString = BuiltinFormats.getBuiltinFormat(this.formatIndex); } } } /* * (non-Javadoc) * * @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, * java.lang.String, java.lang.String) */ public void endElement(String uri, String localName, String name) throws SAXException { String thisStr = null; // v => contents of a cell if ("v".equals(name)) { // Process the value contents as required. // Do now, as characters() may be called more than once switch (nextDataType) { case BOOL: char first = value.charAt(0); thisStr = first == '0' ? "FALSE" : "TRUE"; break; case ERROR: thisStr = "\"ERROR:" + value.toString() + '"'; break; case FORMULA: // A formula could result in a string value, // so always add double-quote characters. thisStr = '"' + value.toString() + '"'; break; case INLINESTR: // TODO: have seen an example of this, so it's untested. XSSFRichTextString rtsi = new XSSFRichTextString(value.toString()); thisStr = '"' + rtsi.toString() + '"'; break; case SSTINDEX: String sstIndex = value.toString(); try { int idx = Integer.parseInt(sstIndex); XSSFRichTextString rtss = new XSSFRichTextString(sharedStringsTable.getEntryAt(idx)); thisStr = '"' + rtss.toString() + '"'; } catch (NumberFormatException ex) { output.println("Failed to parse SST index '" + sstIndex + "': " + ex.toString()); } break; case NUMBER: String n = value.toString(); if (isDateStr(n)) { Double d = Double.parseDouble(n); Date date = HSSFDateUtil.getJavaDate(d); thisStr = formateDateToString(date); } else// ?? if (HSSFDateUtil.isADateFormat(this.formatIndex, n)) { Double d = Double.parseDouble(n); Date date = HSSFDateUtil.getJavaDate(d); thisStr = formateTimeToString(date); } else if (this.formatString != null) thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex, this.formatString); else thisStr = n; break; default: thisStr = "(TODO: Unexpected type: " + nextDataType + ")"; break; } // Output after we've seen the string contents // Emit commas for any fields that were missing on this row if (lastColumnNumber == -1) { lastColumnNumber = 0; } //?? if (thisStr == null || "".equals(isCellNull)) { isCellNull = true;// ?? } record[thisColumn] = thisStr; // Update column if (thisColumn > -1) lastColumnNumber = thisColumn; } else if ("row".equals(name)) { // Print out any missing commas if needed if (minColumns > 0) { // Columns are 0 based if (lastColumnNumber == -1) { lastColumnNumber = 0; } if (isCellNull == false && record[0] != null && record[1] != null)// ? { rows.add(record.clone()); isCellNull = false; for (int i = 0; i < record.length; i++) { record[i] = null; } } } lastColumnNumber = -1; } } private boolean isDateStr(String str) { String reg = "^4([0-9]){4}"; return Pattern.compile(reg).matcher(str).find(); } public List<String[]> getRows() { return rows; } public void setRows(List<String[]> rows) { this.rows = rows; } /** * Captures characters only if a suitable element is open. Originally * was just "v"; extended for inlineStr also. */ public void characters(char[] ch, int start, int length) throws SAXException { if (vIsOpen) value.append(ch, start, length); } /** * Converts an Excel column name like "C" to a zero-based index. * * @param name * @return Index corresponding to the specified name */ private int nameToColumn(String name) { int column = -1; for (int i = 0; i < name.length(); ++i) { int c = name.charAt(i); column = (column + 1) * 26 + c - 'A'; } return column; } private String formateDateToString(Date date) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd");//? return sdf.format(date); } private String formateTimeToString(Date date) { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");//? return sdf.format(date); } } // ///////////////////////////////////// private OPCPackage xlsxPackage; private int minColumns; private PrintStream output; private String sheetName; /** * Creates a new XLSX -> CSV converter * * @param pkg * The XLSX package to process * @param output * The PrintStream to output the CSV to * @param minColumns * The minimum number of columns to output, or -1 for no minimum */ public ExcelReadAndWrite(OPCPackage pkg, PrintStream output, String sheetName, int minColumns) { this.xlsxPackage = pkg; this.output = output; this.minColumns = minColumns; this.sheetName = sheetName; } /** * Parses and shows the content of one sheet using the specified styles and * shared-strings tables. * * @param styles * @param strings * @param sheetInputStream */ public List<String[]> processSheet(StylesTable styles, ReadOnlySharedStringsTable strings, InputStream sheetInputStream) throws IOException, ParserConfigurationException, SAXException { InputSource sheetSource = new InputSource(sheetInputStream); SAXParserFactory saxFactory = SAXParserFactory.newInstance(); SAXParser saxParser = saxFactory.newSAXParser(); XMLReader sheetParser = saxParser.getXMLReader(); MyXSSFSheetHandler handler = new MyXSSFSheetHandler(styles, strings, this.minColumns, this.output); sheetParser.setContentHandler(handler); sheetParser.parse(sheetSource); return handler.getRows(); } /** * ??? * * @throws IOException * @throws OpenXML4JException * @throws ParserConfigurationException * @throws SAXException */ public List<String[]> process() throws IOException, OpenXML4JException, ParserConfigurationException, SAXException { ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(this.xlsxPackage); XSSFReader xssfReader = new XSSFReader(this.xlsxPackage); List<String[]> list = null; StylesTable styles = xssfReader.getStylesTable(); XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData(); int index = 0; while (iter.hasNext()) { InputStream stream = iter.next(); String sheetNameTemp = iter.getSheetName(); if (this.sheetName.equals(sheetNameTemp)) { list = processSheet(styles, strings, stream); stream.close(); ++index; } } return list; } /** * ?Excel * * @param path * * @param sheetName * sheet?? * @param minColumns * * @return * @throws SAXException * @throws ParserConfigurationException * @throws OpenXML4JException * @throws IOException */ public static List<String[]> readerExcel(String path, String sheetName, int minColumns) throws IOException, OpenXML4JException, ParserConfigurationException, SAXException { OPCPackage p = OPCPackage.open(path, PackageAccess.READ); ExcelReadAndWrite xlsx2csv = new ExcelReadAndWrite(p, System.out, sheetName, minColumns); List<String[]> list = xlsx2csv.process(); p.close(); return list; } public static void main(String[] args) throws Exception { List<String[]> list = ExcelReadAndWrite.readerExcel("F:\\workspace\\EstateAudit\\files\\come.xlsx", "???", 100); for (String[] record : list) { for (String cell : record) { System.out.print(cell + " "); } System.out.println(); } } public void testWorkBook() { try { long curr_time = System.currentTimeMillis(); int rowaccess = 100;// /*keep 100 rowsin memory,exceeding rows will be flushed to disk*/ SXSSFWorkbook wb = new SXSSFWorkbook(rowaccess); int sheet_num = 3;//?3SHEET for (int i = 0; i < sheet_num; i++) { Sheet sh = wb.createSheet(); //?SHEET60000ROW for (int rownum = 0; rownum < 60000; rownum++) { Row row = sh.createRow(rownum); //?10CELL for (int cellnum = 0; cellnum < 10; cellnum++) { Cell cell = row.createCell(cellnum); String address = new CellReference(cell).formatAsString(); cell.setCellValue(address); } //??,? if (rownum % rowaccess == 0) { ((SXSSFSheet) sh).flushRows(); } } } /*?*/ FileOutputStream os = new FileOutputStream("d:/biggrid.xlsx"); wb.write(os); os.close(); /**/ System.out.println(":" + (System.currentTimeMillis() - curr_time) / 1000); } catch (Exception e) { e.printStackTrace(); } } }