XLSXCovertCSVReader 工具类（XML ）

import cn.com.amway.msgcenter.console.util.StringUtil;
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.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.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.File;
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;

/**

• 使用CVS模式解决XLSX文件，可以有效解决用户模式内存溢出的问题 该模式是POI官方推荐的读取大数据的模式，在用户模式下，数据量较大、Sheet较多、或者是有很多无用的空行的情况
• ，容易出现内存溢出,用户模式读取Excel的典型代码如下： FileInputStream file=new FileInputStream("c:\test.xlsx"); Workbook
• wb=new XSSFWorkbook(file);

• @author 山人
  */
  public class XLSXCovertCSVReader {
  
  

  /**

  • 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,
    }
    
    
    
    

  /**

  • 使用xssf_sax_API处理Excel,请参考： http://poi.apache.org/spreadsheet/how-to.html#xssf_sax_api
  • <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();// 每次读取都清空行集合
      }
      
      
      
      
      
      
      
      
      
      
      
      

    /*

    • (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();
              // 判断是否是日期格式
              if (HSSFDateUtil.isADateFormat(this.formatIndex, n)) {
                  Double d = Double.parseDouble(n);
                  Date date = HSSFDateUtil.getJavaDate(d);
                  thisStr = formateDateToString(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;
      }
      // 判断单元格的值是否为空
      if (thisStr == null || "".equals(isCellNull)) {
          isCellNull = true;// 设置单元格是否为空值
      }
      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)// 判断是否空行
          {
              rows.add(record.clone());
              isCellNull = false;
              for (int i = 0; i < record.length; i++) {
                  record[i] = null;
              }
          }
      }
      lastColumnNumber = -1;

      }

    }

    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 HH:mm:ss");// 格式化日期
    return sdf.format(date);
    
    

    }

  }

  // /////////////////////////////////////

  private OPCPackage xlsxPackage;
  private int minColumns;
  private PrintStream output;
  
  

  /**

  • 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 XLSXCovertCSVReader(OPCPackage pkg, PrintStream output, int minColumns) {
    this.xlsxPackage = pkg;
    this.output = output;
    this.minColumns = minColumns;
    }
    
    
    
    
    
    

  /**

  • 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();
    }
    
    
    
    
    
    
    
    

  /**

  • 初始化这个处理程序 将
  • @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();
    while (iter.hasNext()) {
    InputStream stream = iter.next();
    list = processSheet(styles, strings, stream);
    stream.close();
    break;
    }
    return list;
    }
    
    
    
    
    
    
    
    
    
    
    
    

  /**

  • 读取Excel
  • @param path 文件路径
  • @param sheetName sheet名称
  • @param minColumns 列总数
  • @return
  • @throws SAXException
  • @throws ParserConfigurationException
  • @throws OpenXML4JException
  • @throws IOException
    */
    public static List<String[]> readerExcel(String path, int minColumns) throws IOException, OpenXML4JException,
    ParserConfigurationException, SAXException {
    OPCPackage p = OPCPackage.open(path, PackageAccess.READ);
    XLSXCovertCSVReader xlsx2csv = new XLSXCovertCSVReader(p, System.out, minColumns);
    List<String[]> list = xlsx2csv.process();
    p.close();
    return list;
    }
    
    
    
    
    
    
    
    
    

  /**

  • @param file
  • @param minColumns
  • @return
  • @throws IOException
  • @throws OpenXML4JException
  • @throws ParserConfigurationException
  • @throws SAXException
    */
    public static List<String[]> readerExcel(File file, int minColumns) throws IOException, OpenXML4JException,
    ParserConfigurationException, SAXException {
    OPCPackage p = OPCPackage.open(file, PackageAccess.READ);
    XLSXCovertCSVReader xlsx2csv = new XLSXCovertCSVReader(p, System.out, minColumns);
    List<String[]> list = xlsx2csv.process();
    p.close();
    return list;
    }
    
    
    
    
    
    
    
    
    

  /**

  • 读取Excel
  • @param path 文件路径
  • @param sheetName sheet名称
  • @param minColumns 列总数
  • @return
  • @throws SAXException
  • @throws ParserConfigurationException
  • @throws OpenXML4JException

  • @throws IOException
    */
    public static List<String[]> readerExcel(InputStream in, int minColumns) throws IOException, OpenXML4JException,
    ParserConfigurationException, SAXException {
    
    
    

    OPCPackage p = OPCPackage.open(in);
    XLSXCovertCSVReader xlsx2csv = new XLSXCovertCSVReader(p, System.out, minColumns);
    List<String[]> list = xlsx2csv.process();
    List<String[]> newlist=new ArrayList<>();
    p.close();
    for(String [] str:list){
    //判断excle 集合里是否有 All elements are null引起的异常
    if(!StringUtil.isEmpty(str[0])){
    newlist.add(str);
    }
    }
    return newlist;
    }
    
    
    
    
    
    
    
    
    
    
    
    

}

来源：oschina

链接：https://my.oschina.net/u/4349518/blog/4693341