java代码实现excel文件转换为csv文件
2024-05-09 23:55:59
java代码实现excel文件转换为csv文件
pom文件导入
<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>net.sourceforge.jexcelapi</groupId><artifactId>jxl</artifactId><version>2.6.12</version></dependency><dependency><groupId>net.sf.opencsv</groupId><artifactId>opencsv</artifactId><version>2.1</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>ooxml-schemas</artifactId><version>1.1</version><type>pom</type></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.7</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>ooxml-schemas</artifactId><version>1.1</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.7</version></dependency><dependency><groupId>dom4j</groupId><artifactId>dom4j</artifactId><version>1.6.1</version></dependency>
</dependencies>
文件转换类ExcelToCsv直接调用里面方法
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.WorkbookSettings;
import java.io.*;
import java.util.Locale;
/*** @ClassName: ExcelToCsv* @Description:转换excel成csv格式* @Author: mashiwei*/
public class ExcelToCsv {/***将excel(xls/xlsx)转换成csv文件* @param excelFile* @param csvFile* @return String*/public static String getCsv(String excelFile, String csvFile) {//.xlsx文件后缀转成csvif (excelFile.endsWith(".xlsx")){XLSX2CSV.trans(excelFile,csvFile);return csvFile;}//.xls文件后缀转成csvelse {try {OutputStream os = new FileOutputStream(new File(csvFile));OutputStreamWriter osw = new OutputStreamWriter(os, "UTF8");BufferedWriter bw = new BufferedWriter(osw);// 载入Excel文件WorkbookSettings ws = new WorkbookSettings();ws.setLocale(new Locale("en", "EN"));Workbook wk = Workbook.getWorkbook(new File(excelFile), ws);// 从工作簿(workbook)取得每页(sheets)for (int sheet = 0; sheet < wk.getNumberOfSheets(); sheet++) {Sheet s = wk.getSheet(sheet);Cell[] row = null;// 从每页(sheet)取得每个区块(Cell)for (int i = 0; i < s.getRows(); i++) {row = s.getRow(i);if (row.length > 0) {bw.write(row[0].getContents());for (int j = 1; j < row.length; j++) {//写入分隔符bw.write(',');bw.write(row[j].getContents());}}bw.newLine();}}bw.flush();bw.close();} catch (Exception e) {System.err.println(e.toString());e.printStackTrace();}return csvFile;}}
}
XLSX2CSV类，用来处理文件
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.DataFormatter;
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.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;public class XLSX2CSV {/*** 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,}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 seenprivate 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 streamprivate int lastColumnNumber = -1;// Gathers characters as they are seen.private StringBuffer value;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();}public void startElement(String uri, String localName, String name,Attributes attributes) throws SAXException {vIsOpen = true;// Clear contents cachevalue.setLength(0);}// c => cellelse if ("c".equals(name)) {// Get the cell referenceString 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 formatint 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);}}}public void endElement(String uri, String localName, String name)throws SAXException {String thisStr = null;// v => contents of a cellif ("v".equals(name)) {// Process the value contents as required.// Do now, as characters() may be called more than onceswitch (nextDataType) {case BOOL:char first = value.charAt(0);thisStr = first == '0' ? "FALSE" : "TRUE";break;case ERROR:
// thisStr = "\"ERROR:" + value.toString() + '"';thisStr = "\"ERROR:" + value.toString() + '"';break;case FORMULA:// A formula could result in a string value,// so always add double-quote characters.
// thisStr = '"' + value.toString() + '"';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() + '"';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() + '"';thisStr = rtss.toString() ;} catch (NumberFormatException ex) {output.println("Failed to parse SST index '" + sstIndex+ "': " + ex.toString());}break;case NUMBER:String n = value.toString();if (this.formatString != null)thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex,this.formatString);elsethisStr = n;break;default:
// thisStr = "(TODO: Unexpected type: " + nextDataType + ")";thisStr = "(TODO: Unexpected type: " + nextDataType + ")";break;}// Output after we've seen the string contents// Emit commas for any fields that were missing on this rowif (lastColumnNumber == -1) {lastColumnNumber = 0;}for (int i = lastColumnNumber; i < thisColumn; ++i)output.print(',');// Might be the empty string.output.print(thisStr);// Update columnif (thisColumn > -1)lastColumnNumber = thisColumn;} else if ("row".equals(name)) {// Print out any missing commas if neededif (minColumns > 0) {// Columns are 0 basedif (lastColumnNumber == -1) {lastColumnNumber = 0;}for (int i = lastColumnNumber; i < (this.minColumnCount); i++) {output.print(',');}}// We're onto a new rowoutput.println();lastColumnNumber = -1;}}public void characters(char[] ch, int start, int length)throws SAXException {if (vIsOpen)value.append(ch, start, length);}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 OPCPackage xlsxPackage;private int minColumns;private PrintStream output;private final String OUTPUT_CHARSET = "GBK";/*** 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 XLSX2CSV(OPCPackage pkg, PrintStream output, int minColumns) {this.xlsxPackage = pkg;this.output = output;this.minColumns = minColumns;}//TODO catch exceptionspublic XLSX2CSV(String inputFilePath, String outputFilePath) throws Exception {xlsxPackage = OPCPackage.open(inputFilePath, PackageAccess.READ);output = new PrintStream(outputFilePath, OUTPUT_CHARSET);minColumns = -1;}/*** Parses and shows the content of one sheet using the specified styles and* shared-strings tables.** @param styles* @param strings* @param sheetInputStream*/public void 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();ContentHandler handler = new MyXSSFSheetHandler(styles, strings,this.minColumns, this.output);sheetParser.setContentHandler(handler);sheetParser.parse(sheetSource);}public void process() throws IOException, OpenXML4JException,ParserConfigurationException, SAXException {ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(this.xlsxPackage);XSSFReader xssfReader = new XSSFReader(this.xlsxPackage);StylesTable styles = xssfReader.getStylesTable();XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData();int index = 0;while (iter.hasNext()) {InputStream stream = iter.next();String sheetName = iter.getSheetName();
// this.output.println();
// this.output.println(sheetName + " [index=" + index + "]:");processSheet(styles, strings, stream);stream.close();++index;}}public static void trans(String fileInput,String fileOutput){XLSX2CSV xlsx2csv = null;try {xlsx2csv = new XLSX2CSV(fileInput, fileOutput);} catch (Exception e) {e.printStackTrace();}try {xlsx2csv.process();} catch (IOException e) {e.printStackTrace();} catch (OpenXML4JException e) {e.printStackTrace();} catch (ParserConfigurationException e) {e.printStackTrace();} catch (SAXException e) {e.printStackTrace();}}
}
效果展示
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