POI驱动SAX事件解析Excel功能

我编写的这个解析工具类有做单元格为空补全的功能，指定解析几个sheet页（有些Excel有隐藏的sheet页是不需要解析的）

调用代码：
XxsAnalysisImportExcel xxs = new XxsAnalysisImportExcel();
List>> sheetData = new ArrayList>>();
xxs.process(inputStream, sheetData,3);
//获取到解析的每个sheet页数据
List> sheet0 = sheetData.get(0);
ObjectMapper map = new ObjectMapper();
//转换成业务VO
List baseInfo = map.convertValue(sheet0, new TypeReference() {});

工具类：XxsAnalysisImportExcel.java
package com.qizhidao.ecloud.common.utils;

import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;

import java.io.InputStream;
import java.util.*;

/**

• 导入Excel解析

• @author tanle

• @since 2019年3月1日
  */
  public class XxsAnalysisImportExcel extends DefaultHandler{

  private Integer sheetIndex = 0;

  private Integer curRow = 0;

  private Integer curCol = 0;

  //当前位置
  private Integer preRef = 0;

  private boolean nextIsString = false;

  private String lastContents = “”;

  private SharedStringsTable sst;

  //标题
  List title = new ArrayList();

  //一行数据
  Map obj = new HashMap();

  //业务数据
  List> paramData = new ArrayList>();

  public void process(String filename,List>> sheetData) throws Exception {
  OPCPackage pkg = OPCPackage.open(filename);
  XSSFReader r = new XSSFReader( pkg );
  this.sst = r.getSharedStringsTable();
  XMLReader parser = fetchSheetParser(sst);
  Iterator sheets = r.getSheetsData();
  while(sheets.hasNext()) {
  InputStream sheet = sheets.next();
  InputSource sheetSource = new InputSource(sheet);
  parser.parse(sheetSource);
  sheet.close();
  sheetIndex++;
  sheetData.add(paramData);
  paramData = new ArrayList>();
  curRow = 0;
  title = new ArrayList();
  }
  }

  public void process(InputStream inputStream,List>> sheetData) throws Exception {
  OPCPackage pkg = OPCPackage.open(inputStream);
  XSSFReader r = new XSSFReader( pkg );
  this.sst = r.getSharedStringsTable();
  XMLReader parser = fetchSheetParser(sst);
  Iterator sheets = r.getSheetsData();
  while(sheets.hasNext()) {
  InputStream sheet = sheets.next();
  InputSource sheetSource = new InputSource(sheet);
  parser.parse(sheetSource);
  sheet.close();
  sheetIndex++;
  sheetData.add(paramData);
  paramData = new ArrayList>();
  curRow = 0;
  title = new ArrayList();
  }
  }

  /**

  • 在此添加类型注释
  • @param inputStream Excel文件流
  • @param sheetData 返回的数据，多个sheet页
  • @param sheetNumber 解析几个sheet页的数据
  • @throws Exception
    */
    public void process(InputStream inputStream,List>> sheetData,int sheetNumber) throws Exception {
    OPCPackage pkg = OPCPackage.open(inputStream);
    XSSFReader r = new XSSFReader( pkg );
    this.sst = r.getSharedStringsTable();
    XMLReader parser = fetchSheetParser(sst);
    for (int i = 1; i <= sheetNumber; i++) {
    InputStream sheet = r.getSheet(“rId”+i);
    InputSource sheetSource = new InputSource(sheet);
    parser.parse(sheetSource);
    sheet.close();
    sheetIndex++;
    sheetData.add(paramData);
    paramData = new ArrayList>();
    curRow = 0;
    title = new ArrayList();
    }
    }

  public XMLReader fetchSheetParser(SharedStringsTable sst) throws SAXException {
  XMLReader parser = XMLReaderFactory.createXMLReader();
  ContentHandler handler = this;
  parser.setContentHandler(handler);
  return parser;
  }

  @Override
  public void characters (char ch[], int start, int length) throws SAXException{
  lastContents += new String(ch, start, length);
  }
  @Override
  public void startElement(String uri, String localName, String name,Attributes attributes) throws SAXException {
  if(name.equals(“c”)) {
  String cellType = attributes.getValue(“t”);
  curCol = this.getCellCoordinate(attributes.getValue(“r”));
  if(cellType != null && cellType.equals(“s”)) {
  nextIsString = true;
  } else {
  nextIsString = false;
  }
  }
  lastContents = “”;
  }
  @Override
  public void endElement(String uri, String localName, String name) throws SAXException {
  if(nextIsString) {
  int idx = Integer.parseInt(lastContents);
  lastContents = new XSSFRichTextString(this.sst.getEntryAt(idx)).toString();
  nextIsString = false;
  }

   if (name.equals("v")) {
       String value = lastContents.trim();
       
       
       //读取第一行数据，存储标题名称
       if(curRow == 0) {
       	//如果标题有空格不做补空处理，在读取到行尾的逻辑中做下判断如果有空的标题存在直接抛出异常
       	title.add(lastContents);
       }
       
       //从0开始，第三行数据开始保存业务数据
       if(curRow > 1) {
   		//补全规格，规格属性单元格之间的空单元格
           if(preRef < curCol) {
           	int leng = curCol - preRef; 
           	if(leng > 1) {
           		for (int i = preRef; i < curCol; i++) {
           			String titleName = title.get(i);
           			obj.put(titleName, "");
   				}
           	}
           }
           
           String titleName = title.get(curCol-1);
   		obj.put(titleName, value);
       }
       preRef = 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")) {
       	//从0开始，第三行数据开始保存业务数据
       	if(curRow > 1) {
       		//如果规则属性内容数量不等于规则标题数量，证明尾部有空格，需补齐。
       		if(obj.size() > 0 && obj.size() < title.size()) {
       			for (int i = obj.size(); i < title.size(); i++) {
       				String titleName = title.get(i);
       	    		obj.put(titleName, "");
   				}
       		}
       	}
       	
       	if(obj.size() > 0) {
       		paramData.add(obj);
       	}
       	obj = new HashMap();
   		curRow++;
           curCol = 0; 
           preRef = 0;
       } 
   } 
  

  }

  /**

  • Excel列号转换成数字
  • @author tanle
  • @since 2019年1月23日
  • @param column
  • @return
    */
    public Integer getCellCoordinate(String column) {
    column = column.replaceAll("\d", “”);
    int num = 0;
    int result = 0;
    int length =column.length();
    for(int i = 0; i < length; i++) {
    char ch = column.charAt(length - i - 1);
    num = (int)(ch - ‘A’ + 1) ;
    num *= Math.pow(26, i);
    result += num;
    }
    return result;
    }

}