http://blog.csdn.net/l081307114/article/details/46009015
http://www.cnblogs.com/dreammyle/p/5458280.html
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. Office2007與Office Open XML
????在Office 2007之前，Office一直都是以二進制位的方式存儲，但這種格式不易被其它軟件拿來使用，在各界的壓力下，MicroSoft于2005年發布了基于XML的ooxml開放文檔標準。ooxml的xml schema強調減少load time，增快parsing speed，將child elements分開存儲，而不是multiple attributes一起存，這有點類似于HTML的結構。ooxml 使用XML和ZIP技術結合進行文件存儲，因為XML是一個基于文本的格式，而且ZIP容器支持內容的壓縮，所以其一大優勢就是可以大大減小文件的尺寸。其它特點這里不再敘述。
2. SAX方式解析XML
??? SAX全稱Simple API for XML，它是一個接口，也是一個軟件包。它是一種XML解析的替代方法，不同于DOM解析XML文檔時把所有內容一次性加載到內存中的方式，它逐行掃描文檔，一邊掃描，一邊解析。所以那些只需要單遍讀取內容的應用程序就可以從SAX解析中受益，這對大型文檔的解析是個巨大優勢。另外，SAX “推" 模型可用于廣播環境，能夠同時注冊多個ContentHandler，并行接收事件，而不是在一個管道中一個接一個地進行處理。一些支持 SAX 的語法分析器包括 Xerces，Apache parser（以前的 IBM 語法分析器）、MSXML（Microsoft 語法分析器）和 XDK（Oracle 語法分析器）。這些語法分析器是最靈活的，因為它們還支持 DOM。
3. POI以SAX解析excel2007文件
?? 所需jar包：poi-3.10-FINAL-20140208.jar，poi-ooxml-3.10-FINAL-20140208.jar， poi-ooxml-schemas-3.10-FINAL-20140208.jar
?? 輔助工具：Open XML SDK 2.5
?? 原始文件：book1.xlsx
???
?? SDK展示：注意其中第四行只有三個cell元素，第五行只有兩個cell元素，而這種空單元格的處理正是我們所要注意的
?? 程序源碼：
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[java]?view plaincopy
package?test;????import?java.io.BufferedWriter;??import?java.io.FileOutputStream;??import?java.io.IOException;??import?java.io.InputStream;??import?java.io.OutputStreamWriter;??import?java.sql.SQLException;??import?java.util.ArrayList;??import?java.util.Iterator;??import?java.util.List;????import?org.apache.poi.openxml4j.opc.OPCPackage;??import?org.apache.poi.ss.usermodel.BuiltinFormats;??import?org.apache.poi.ss.usermodel.DataFormatter;??import?org.apache.poi.xssf.eventusermodel.XSSFReader;??import?org.apache.poi.xssf.model.SharedStringsTable;??import?org.apache.poi.xssf.model.StylesTable;??import?org.apache.poi.xssf.usermodel.XSSFCellStyle;??import?org.apache.poi.xssf.usermodel.XSSFRichTextString;??import?org.xml.sax.Attributes;??import?org.xml.sax.ContentHandler;??import?org.xml.sax.InputSource;??import?org.xml.sax.SAXException;??import?org.xml.sax.XMLReader;??import?org.xml.sax.helpers.DefaultHandler;??import?org.xml.sax.helpers.XMLReaderFactory;????public?class?ExampleEventUserModel?{????????????private?static?StylesTable?stylesTable;????????????????public?void?processOneSheet(String?filename)?throws?Exception?{????????????????????OPCPackage?pkg?=?OPCPackage.open(filename);??????????XSSFReader?r?=?new?XSSFReader(?pkg?);??????????stylesTable?=?r.getStylesTable();???????????SharedStringsTable?sst?=?r.getSharedStringsTable();????????????XMLReader?parser?=?fetchSheetParser(sst);????????????????????InputStream?sheet2?=?r.getSheet("rId1");??????????InputSource?sheetSource?=?new?InputSource(sheet2);??????????parser.parse(sheetSource);??????????sheet2.close();??????}????????????public?void?processAllSheets(String?filename)?throws?Exception?{????????????????????OPCPackage?pkg?=?OPCPackage.open(filename);??????????XSSFReader?r?=?new?XSSFReader(?pkg?);??????????SharedStringsTable?sst?=?r.getSharedStringsTable();????????????????????XMLReader?parser?=?fetchSheetParser(sst);????????????Iterator<InputStream>?sheets?=?r.getSheetsData();??????????while(sheets.hasNext())?{??????????????System.out.println("Processing?new?sheet:\n");??????????????InputStream?sheet?=?sheets.next();??????????????InputSource?sheetSource?=?new?InputSource(sheet);??????????????parser.parse(sheetSource);??????????????sheet.close();??????????????System.out.println("");??????????}??????}????????????public?XMLReader?fetchSheetParser(SharedStringsTable?sst)?throws?SAXException?{??????????XMLReader?parser?=??????????????XMLReaderFactory.createXMLReader(??????????????????????"org.apache.xerces.parsers.SAXParser"??????????????);??????????ContentHandler?handler?=?new?SheetHandler(sst);??????????parser.setContentHandler(handler);??????????return?parser;??????}????????????private?static?class?SheetHandler?extends?DefaultHandler?{????????????????????private?SharedStringsTable?sst;??????????private?String?lastContents;??????????private?boolean?nextIsString;????????????????????private?List<String>?rowlist?=?new?ArrayList<String>();???????????private?int?curRow?=?0;???????????private?int?curCol?=?0;????????????????????????????private?String?preRef?=?null,?ref?=?null;??????????????????private?String?maxRef?=?null;????????????????????private?CellDataType?nextDataType?=?CellDataType.SSTINDEX;???????????private?final?DataFormatter?formatter?=?new?DataFormatter();???????????private?short?formatIndex;???????????private?String?formatString;?????????????????????????????enum?CellDataType{???????????????BOOL,?ERROR,?FORMULA,?INLINESTR,?SSTINDEX,?NUMBER,?DATE,?NULL???????????}????????????????????private?SheetHandler(SharedStringsTable?sst)?{??????????????this.sst?=?sst;??????????}????????????????????????????public?void?startElement(String?uri,?String?localName,?String?name,??????????????????Attributes?attributes)?throws?SAXException?{????????????????????????????????????????if(name.equals("c"))?{??????????????????????????????????if(preRef?==?null){??????????????????????preRef?=?attributes.getValue("r");??????????????????}else{??????????????????????preRef?=?ref;??????????????????}??????????????????????????????????ref?=?attributes.getValue("r");????????????????????????????????????this.setNextDataType(attributes);?????????????????????????????????????????????????????String?cellType?=?attributes.getValue("t");??????????????????if(cellType?!=?null?&&?cellType.equals("s"))?{??????????????????????nextIsString?=?true;??????????????????}?else?{??????????????????????nextIsString?=?false;??????????????????}????????????????????????????????}??????????????????????????lastContents?=?"";??????????}????????????????????????????public?void?setNextDataType(Attributes?attributes){?????????????????nextDataType?=?CellDataType.NUMBER;???????????????formatIndex?=?-1;???????????????formatString?=?null;???????????????String?cellType?=?attributes.getValue("t");???????????????String?cellStyleStr?=?attributes.getValue("s");???????????????if?("b".equals(cellType)){???????????????????nextDataType?=?CellDataType.BOOL;??????????????}else?if?("e".equals(cellType)){???????????????????nextDataType?=?CellDataType.ERROR;???????????????}else?if?("inlineStr".equals(cellType)){???????????????????nextDataType?=?CellDataType.INLINESTR;???????????????}else?if?("s".equals(cellType)){???????????????????nextDataType?=?CellDataType.SSTINDEX;???????????????}else?if?("str".equals(cellType)){???????????????????nextDataType?=?CellDataType.FORMULA;???????????????}??????????????if?(cellStyleStr?!=?null){???????????????????int?styleIndex?=?Integer.parseInt(cellStyleStr);???????????????????XSSFCellStyle?style?=?stylesTable.getStyleAt(styleIndex);???????????????????formatIndex?=?style.getDataFormat();???????????????????formatString?=?style.getDataFormatString();???????????????????if?("m/d/yy"?==?formatString){???????????????????????nextDataType?=?CellDataType.DATE;???????????????????????????????????????????formatString?=?"yyyy-MM-dd";??????????????????}???????????????????if?(formatString?==?null){???????????????????????nextDataType?=?CellDataType.NULL;???????????????????????formatString?=?BuiltinFormats.getBuiltinFormat(formatIndex);???????????????????}???????????????}???????????}????????????????????????????public?void?endElement(String?uri,?String?localName,?String?name)??????????????????throws?SAXException?{??????????????????????????????????????if(nextIsString)?{??????????????????int?idx?=?Integer.parseInt(lastContents);??????????????????lastContents?=?new?XSSFRichTextString(sst.getEntryAt(idx)).toString();??????????????????nextIsString?=?false;??????????????}????????????????????????????????????????if?(name.equals("v"))?{???????????????????String?value?=?this.getDataValue(lastContents.trim(),?"");???????????????????????????????????if(!ref.equals(preRef)){??????????????????????int?len?=?countNullCell(ref,?preRef);??????????????????????for(int?i=0;i<len;i++){??????????????????????????rowlist.add(curCol,?"");??????????????????????????curCol++;??????????????????????}??????????????????}??????????????????rowlist.add(curCol,?value);??????????????????curCol++;???????????????}else?{???????????????????????????????????if?(name.equals("row"))?{??????????????????????String?value?=?"";??????????????????????????????????????????if(curRow?==?0){??????????????????????????maxRef?=?ref;??????????????????????}??????????????????????????????????????????if(maxRef?!=?null){??????????????????????????int?len?=?countNullCell(maxRef,?ref);??????????????????????????for(int?i=0;i<=len;i++){??????????????????????????????rowlist.add(curCol,?"");??????????????????????????????curCol++;??????????????????????????}??????????????????????}??????????????????????????????????????????for(int?i=0;i<rowlist.size();i++){??????????????????????????if(rowlist.get(i).contains(",")){??????????????????????????????value?+=?"\""+rowlist.get(i)+"\",";??????????????????????????}else{??????????????????????????????value?+=?rowlist.get(i)+",";??????????????????????????}??????????????????????}??????????????????????????????????????????value?+=?"\n";??????????????????????try?{??????????????????????????writer.write(value);??????????????????????}?catch?(IOException?e)?{??????????????????????????e.printStackTrace();??????????????????????}??????????????????????curRow++;??????????????????????????????????????????rowlist.clear();???????????????????????curCol?=?0;???????????????????????preRef?=?null;??????????????????????ref?=?null;??????????????????}???????????????}???????????}????????????????????????????public?String?getDataValue(String?value,?String?thisStr)?????????????{???????????????switch?(nextDataType)???????????????{???????????????????????????????????case?BOOL:???????????????????char?first?=?value.charAt(0);???????????????????thisStr?=?first?==?'0'???"FALSE"?:?"TRUE";???????????????????break;???????????????????case?ERROR:???????????????????thisStr?=?"\"ERROR:"?+?value.toString()?+?'"';???????????????????break;???????????????????case?FORMULA:???????????????????thisStr?=?'"'?+?value.toString()?+?'"';???????????????????break;???????????????????case?INLINESTR:???????????????????XSSFRichTextString?rtsi?=?new?XSSFRichTextString(value.toString());???????????????????thisStr?=?rtsi.toString();???????????????????rtsi?=?null;???????????????????break;???????????????????case?SSTINDEX:???????????????????String?sstIndex?=?value.toString();???????????????????thisStr?=?value.toString();???????????????????break;???????????????????case?NUMBER:???????????????????if?(formatString?!=?null){???????????????????????thisStr?=?formatter.formatRawCellContents(Double.parseDouble(value),?formatIndex,?formatString).trim();???????????????????}else{??????????????????????thisStr?=?value;???????????????????}???????????????????thisStr?=?thisStr.replace("_",?"").trim();???????????????????break;???????????????????case?DATE:???????????????????????try{??????????????????????????thisStr?=?formatter.formatRawCellContents(Double.parseDouble(value),?formatIndex,?formatString);???????????????????????}catch(NumberFormatException?ex){??????????????????????????thisStr?=?value.toString();??????????????????????}??????????????????thisStr?=?thisStr.replace("?",?"");??????????????????break;???????????????????default:???????????????????thisStr?=?"";???????????????????break;???????????????}???????????????return?thisStr;???????????}?????????????????????public?void?characters(char[]?ch,?int?start,?int?length)??????????????????throws?SAXException?{??????????????lastContents?+=?new?String(ch,?start,?length);??????????}????????????????????????????public?int?countNullCell(String?ref,?String?preRef){??????????????????????????String?xfd?=?ref.replaceAll("\\d+",?"");??????????????String?xfd_1?=?preRef.replaceAll("\\d+",?"");????????????????????????????xfd?=?fillChar(xfd,?3,?'@',?true);??????????????xfd_1?=?fillChar(xfd_1,?3,?'@',?true);????????????????????????????char[]?letter?=?xfd.toCharArray();??????????????char[]?letter_1?=?xfd_1.toCharArray();??????????????int?res?=?(letter[0]-letter_1[0])*26*26?+?(letter[1]-letter_1[1])*26?+?(letter[2]-letter_1[2]);??????????????return?res-1;??????????}????????????????????????????String?fillChar(String?str,?int?len,?char?let,?boolean?isPre){??????????????int?len_1?=?str.length();??????????????if(len_1?<len){??????????????????if(isPre){??????????????????????for(int?i=0;i<(len-len_1);i++){??????????????????????????str?=?let+str;??????????????????????}??????????????????}else{??????????????????????for(int?i=0;i<(len-len_1);i++){??????????????????????????str?=?str+let;??????????????????????}??????????????????}??????????????}??????????????return?str;??????????}??????}????????????static?BufferedWriter?writer?=?null;????????public?static?void?main(String[]?args)?throws?Exception?{??????????ExampleEventUserModel?example?=?new?ExampleEventUserModel();??????????String?str?=?"Book1";??????????String?filename?=?"D:\\"+str+".xlsx?";??????????System.out.println("--?程序開始?--");??????????long?time_1?=?System.currentTimeMillis();??????????try{??????????????writer?=?new?BufferedWriter(new?OutputStreamWriter(new?FileOutputStream("D:\\"+str+".csv")));??????????????example.processOneSheet(filename);??????????}finally{??????????????writer.close();??????????}??????????long?time_2?=?System.currentTimeMillis();??????????System.out.println("--?程序結束?--");??????????System.out.println("--?耗時?--"+(time_2?-?time_1)+"ms");??????}??????}?? 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最后輸出結果：
[plain]?view plaincopy
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本文實例主要講述了Java生成CSV文件的方法，具體實現步驟如下：
1、新建CSVUtils.java文件：
package com.saicfc.pmpf.internal.manage.utils;import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;/*** 文件操作*/
public class CSVUtils {/*** 生成為CVS文件* * @param exportData 源數據List* @param map csv文件的列表頭map* @param outPutPath 文件路徑* @param fileName 文件名稱* @return*/@SuppressWarnings("rawtypes")public static File createCSVFile(List exportData, LinkedHashMap map, String outPutPath, String fileName) {File csvFile = null;BufferedWriter csvFileOutputStream = null;try {File file = new File(outPutPath);if (!file.exists()) {file.mkdir();}// 定義文件名格式并創建csvFile = File.createTempFile(fileName, ".csv", new File(outPutPath));System.out.println("csvFile：" + csvFile);// UTF-8使正確讀取分隔符","csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(csvFile), "UTF-8"),1024);System.out.println("csvFileOutputStream：" + csvFileOutputStream);// 寫入文件頭部for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator.hasNext();) {java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();csvFileOutputStream.write("" + (String) propertyEntry.getValue() != null ?(String) propertyEntry.getValue() : "" + "");if (propertyIterator.hasNext()) {csvFileOutputStream.write(",");}}csvFileOutputStream.newLine();// 寫入文件內容for (Iterator iterator = exportData.iterator(); iterator.hasNext();) {Object row = (Object) iterator.next();for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator.hasNext();) {java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();csvFileOutputStream.write((String) BeanUtils.getProperty(row, (String) propertyEntry.getKey()));if (propertyIterator.hasNext()) {csvFileOutputStream.write(",");}}if (iterator.hasNext()) {csvFileOutputStream.newLine();}}csvFileOutputStream.flush();} catch (Exception e) {e.printStackTrace();} finally {try {csvFileOutputStream.close();} catch (IOException e) {e.printStackTrace();}}return csvFile;}/*** 下載文件* * @param response* @param csvFilePath 文件路徑* @param fileName 文件名稱* @throws IOException*/public static void exportFile(HttpServletResponse response, String csvFilePath, String fileName)throws IOException {response.setContentType("application/csv;charset=UTF-8");response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "UTF-8"));InputStream in = null;try {in = new FileInputStream(csvFilePath);int len = 0;byte[] buffer = new byte[1024];response.setCharacterEncoding("UTF-8");OutputStream out = response.getOutputStream();while ((len = in.read(buffer)) > 0) {out.write(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF });out.write(buffer, 0, len);}} catch (FileNotFoundException e) {System.out.println(e);} finally {if (in != null) {try {in.close();} catch (Exception e) {throw new RuntimeException(e);}}}}/*** 刪除該目錄filePath下的所有文件* * @param filePath 文件目錄路徑*/public static void deleteFiles(String filePath) {File file = new File(filePath);if (file.exists()) {File[] files = file.listFiles();for (int i = 0; i < files.length; i++) {if (files[i].isFile()) {files[i].delete();}}}}/*** 刪除單個文件* * @param filePath 文件目錄路徑* @param fileName 文件名稱*/public static void deleteFile(String filePath, String fileName) {File file = new File(filePath);if (file.exists()) {File[] files = file.listFiles();for (int i = 0; i < files.length; i++) {if (files[i].isFile()) {if (files[i].getName().equals(fileName)) {files[i].delete();return;}}}}}/*** 測試數據* * @param args*/@SuppressWarnings({ "rawtypes", "unchecked" })public static void main(String[] args) {List exportData = new ArrayList<Map>();Map row1 = new LinkedHashMap<String, String>();row1.put("1", "11");row1.put("2", "12");row1.put("3", "13");row1.put("4", "14");exportData.add(row1);row1 = new LinkedHashMap<String, String>();row1.put("1", "21");row1.put("2", "22");row1.put("3", "23");row1.put("4", "24");exportData.add(row1);LinkedHashMap map = new LinkedHashMap();map.put("1", "第一列");map.put("2", "第二列");map.put("3", "第三列");map.put("4", "第四列");String path = "c:/export/";String fileName = "文件導出";File file = CSVUtils.createCSVFile(exportData, map, path, fileName);String fileName2 = file.getName();System.out.println("文件名稱：" + fileName2);}
}
2、調用createCSVFile方法生成CSV文件
public static void main(String[] args) {String name = "銀行退款數據";List exportData = new ArrayList();LinkedHashMap datamMap = null;for (Iterator iterator = refundList.iterator(); iterator.hasNext();) {HashMap map = (HashMap) iterator.next();datamMap = new LinkedHashMap();datamMap.put("1", map.get("merOrderId"));datamMap.put("2", DateUtil.convertDateToString("yyyyMMdd", (Date) map.get("orderTime")));BigDecimal amount = (BigDecimal) map.get("amount");String amountString = amount.divide(new BigDecimal(10)).toPlainString();datamMap.put("3", amountString);datamMap.put("4", map.get("remark") != null ? map.get("remark") : "");exportData.add(datamMap);}LinkedHashMap map = new LinkedHashMap();map.put("1", "訂單號");map.put("2", "支付日期");map.put("3", "退貨現金金額（整數金額 單位：分）");map.put("4", "退貨原因");File file = CSVUtils.createCSVFile(exportData, map, filePath, name);// 生成CSV文件fileName = file.getName();CSVUtils.exportFile(response, filePath + fileName, fileName);// 下載生成的CSV文件}
本文轉自：http://www.jb51.net/article/52724.htm
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