POI以SAX方式解析Excel2007大文件(包含空单元格的处理) Java生成CSV文件实例详解

2022-11-13 21:56:13

http://blog.csdn.net/l081307114/article/details/46009015

http://www.cnblogs.com/dreammyle/p/5458280.html

. Office2007与Office Open XML

在Office 2007之前，Office一直都是以二进制位的方式存储，但这种格式不易被其它软件拿来使用，在各界的压力下，MicroSoft于2005年发布了基于XML的ooxml开放文档标准。ooxml的xml schema强调减少load time，增快parsing speed，将child elements分开存储，而不是multiple attributes一起存，这有点类似于HTML的结构。ooxml 使用XML和ZIP技术结合进行文件存储，因为XML是一个基于文本的格式，而且ZIP容器支持内容的压缩，所以其一大优势就是可以大大减小文件的尺寸。其它特点这里不再叙述。

2. SAX方式解析XML

SAX全称Simple API for XML，它是一个接口，也是一个软件包。它是一种XML解析的替代方法，不同于DOM解析XML文档时把所有内容一次性加载到内存中的方式，它逐行扫描文档，一边扫描，一边解析。所以那些只需要单遍读取内容的应用程序就可以从SAX解析中受益，这对大型文档的解析是个巨大优势。另外，SAX “推" 模型可用于广播环境，能够同时注册多个ContentHandler，并行接收事件，而不是在一个管道中一个接一个地进行处理。一些支持 SAX 的语法分析器包括 Xerces，Apache parser（以前的 IBM 语法分析器）、MSXML（Microsoft 语法分析器）和 XDK（Oracle 语法分析器）。这些语法分析器是最灵活的，因为它们还支持 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

辅助工具：Open XML SDK 2.5

原始文件：book1.xlsx

SDK展示：注意其中第四行只有三个cell元素，第五行只有两个cell元素，而这种空单元格的处理正是我们所要注意的

程序源码：

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;
/**
* 处理一个sheet
* @param filename
* @throws Exception
*/
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);
// Seems to either be rId# or rSheet#
InputStream sheet2 = r.getSheet("rId1");
InputSource sheetSource = new InputSource(sheet2);
parser.parse(sheetSource);
sheet2.close();
}
/**
* 处理所有sheet
* @param filename
* @throws Exception
*/
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("");
}
}
/**
* 获取解析器
* @param sst
* @return
* @throws SAXException
*/
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;
}
/**
* 自定义解析处理器
* See org.xml.sax.helpers.DefaultHandler javadocs
*/
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;
//定义前一个元素和当前元素的位置，用来计算其中空的单元格数量，如A6和A8等
private String preRef = null, ref = null;
//定义该文档一行最大的单元格数，用来补全一行最后可能缺失的单元格
private String maxRef = null;
private CellDataType nextDataType = CellDataType.SSTINDEX;
private final DataFormatter formatter = new DataFormatter();
private short formatIndex;
private String formatString;
//用一个enum表示单元格可能的数据类型
enum CellDataType{
BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER, DATE, NULL
}
private SheetHandler(SharedStringsTable sst) {
this.sst = sst;
}
/**
* 解析一个element的开始时触发事件
*/
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
// c => cell
if(name.equals("c")) {
//前一个单元格的位置
if(preRef == null){
preRef = attributes.getValue("r");
}else{
preRef = ref;
}
//当前单元格的位置
ref = attributes.getValue("r");
this.setNextDataType(attributes);
// Figure out if the value is an index in the SST
String cellType = attributes.getValue("t");
if(cellType != null && cellType.equals("s")) {
nextIsString = true;
} else {
nextIsString = false;
}
}
// Clear contents cache
lastContents = "";
}
/**
* 根据element属性设置数据类型
* @param attributes
*/
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;
//full format is "yyyy-MM-dd hh:mm:ss.SSS";
formatString = "yyyy-MM-dd";
}
if (formatString == null){
nextDataType = CellDataType.NULL;
formatString = BuiltinFormats.getBuiltinFormat(formatIndex);
}
}
}
/**
* 解析一个element元素结束时触发事件
*/
public void endElement(String uri, String localName, String name)
throws SAXException {
// Process the last contents as required.
// Do now, as characters() may be called more than once
if(nextIsString) {
int idx = Integer.parseInt(lastContents);
lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
nextIsString = false;
}
// v => contents of a cell
// Output after we've seen the string contents
if (name.equals("v")) {
String value = this.getDataValue(lastContents.trim(), "");
//补全单元格之间的空单元格
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 {
//如果标签名称为 row，这说明已到行尾，调用 optRows() 方法
if (name.equals("row")) {
String value = "";
//默认第一行为表头，以该行单元格数目为最大数目
if(curRow == 0){
maxRef = ref;
}
//补全一行尾部可能缺失的单元格
if(maxRef != null){
int len = countNullCell(maxRef, ref);
for(int i=0;i<=len;i++){
rowlist.add(curCol, "");
curCol++;
}
}
//拼接一行的数据
for(int i=0;i<rowlist.size();i++){
if(rowlist.get(i).contains(",")){
value += "\""+rowlist.get(i)+"\",";
}else{
value += rowlist.get(i)+",";
}
}
//加换行符
value += "\n";
try {
writer.write(value);
} catch (IOException e) {
e.printStackTrace();
}
curRow++;
//一行的末尾重置一些数据
rowlist.clear();
curCol = 0;
preRef = null;
ref = null;
}
}
}
/**
* 根据数据类型获取数据
* @param value
* @param thisStr
* @return
*/
public String getDataValue(String value, String thisStr)
{
switch (nextDataType)
{
//这几个的顺序不能随便交换，交换了很可能会导致数据错误
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;
}
/**
* 获取element的文本数据
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
lastContents += new String(ch, start, length);
}
/**
* 计算两个单元格之间的单元格数目(同一行)
* @param ref
* @param preRef
* @return
*/
public int countNullCell(String ref, String preRef){
//excel2007最大行数是1048576，最大列数是16384，最后一列列名是XFD
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;
}
/**
* 字符串的填充
* @param str
* @param len
* @param let
* @param isPre
* @return
*/
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("-- 程序开始 --");
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("-- 程序结束 --");
System.out.println("-- 耗时 --"+(time_2 - time_1)+"ms");
}
}

最后输出结果：

书目,作者,主题,语言,分类,阅读计划,
生活在别处,米兰.昆德拉,人生感悟,英语,哲理,3周,
人间词话,王国维,诗词评论,中文,文学,5周,
宽容,房龙,,英语,,,
深入理解计算机系统,,,,计算机,,

本文实例主要讲述了Java生成CSV文件的方法，具体实现步骤如下：

1、新建CSVUtils.java文件：

POI以SAX方式解析Excel2007大文件(包含空单元格的处理) Java生成CSV文件实例详解

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 {

    /**

     * 生成为CVS文件

     *

     * @param exportData 源数据List

     * @param map csv文件的列表头map

     * @param outPutPath 文件路径

     * @param fileName 文件名称

     * @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();

            }

            // 定义文件名格式并创建

            csvFile = File.createTempFile(fileName, ".csv", new File(outPutPath));

            System.out.println("csvFile：" + csvFile);

            // UTF-8使正确读取分隔符","

            csvFileOutputStream = new BufferedWriter(

                    new OutputStreamWriter(

                            new FileOutputStream(csvFile), "UTF-8"),1024);

            System.out.println("csvFileOutputStream：" + csvFileOutputStream);

            // 写入文件头部

            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();

            // 写入文件内容

            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;

    }

    /**

     * 下载文件

     *

     * @param response

     * @param csvFilePath 文件路径

     * @param fileName 文件名称

     * @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);

                }

            }

        }

    }

    /**

     * 删除该目录filePath下的所有文件

     *

     * @param filePath 文件目录路径

     */

    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();

                }

            }

        }

    }

    /**

     * 删除单个文件

     *

     * @param filePath 文件目录路径

     * @param fileName 文件名称

     */

    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;

                    }

                }

            }

        }

    }

    /**

     * 测试数据

     *

     * @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 = "文件导出";

        File file = CSVUtils.createCSVFile(exportData, map, path, fileName);

        String fileName2 = file.getName();

        System.out.println("文件名称：" + fileName2);

    }

}

2、调用createCSVFile方法生成CSV文件

　　public static void main(String[] args) {

        String name = "银行退款数据";

        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", "订单号");

        map.put("2", "支付日期");

        map.put("3", "退货现金金额（整数金额 单位：分）");

        map.put("4", "退货原因");

        File file = CSVUtils.createCSVFile(exportData, map, filePath, name);// 生成CSV文件

        fileName = file.getName();

        CSVUtils.exportFile(response, filePath + fileName, fileName);// 下载生成的CSV文件

    }

本文转自：http://www.jb51.net/article/52724.htm

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