POI事件模型处理execl导入功能(只支持07版本的execl)

由于通过new XSSFWorkbook 这种方式导入导致生产环境端口宕机、通过dump文件和javacore文件分析是导入功能导致的。
解决办法：自己通过网上写的工具类，不知道是否存在bug。

package com.yygx.impexptemplate.utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.eventusermodel.XSSFReader.SheetIterator;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.springframework.beans.factory.annotation.Autowired;
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 org.xml.sax.helpers.XMLReaderFactory;

public class ExcelReaderParse extends DefaultHandler {

	private List<String> rowData = new ArrayList<String>();
	private List<String[]> sheetData = new ArrayList<String[]>();
	private Map<Integer, Object> map = new HashMap<Integer, Object>();
	private String lastContents;
	private SharedStringsTable sst;
	private boolean nextIsString;
	private Integer limit = 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 int curRow = 0;
	private int maxlimit = 0;
	private List<String[]> sheetNames ;
	
	private int titleRow = 2;

	public int getSheetRow() {
		return titleRow;
	}

	public void setSheetRow(int sheetRow) {
		this.titleRow = sheetRow;
	}

	public List<String[]> getSheetNames() {
		return sheetNames;
	}

	public void setSheetNames(List<String[]> sheetNames) {
		this.sheetNames = sheetNames;
	}

	public Map<Integer, Object> getMap() {
		return map;
	}

	public void setMap(Map<Integer, Object> map) {
		this.map = map;
	}

	/**
	 * 读取所有工作簿的入口方法
	 * 
	 * @param path
	 * @throws Exception
	 */
	@Autowired
	public void process(InputStream inputStream) {
		OPCPackage pkg = null;
		InputStream sheet = null;
		try {
			pkg = OPCPackage.open(inputStream);
			XSSFReader r = new XSSFReader(pkg);
			SharedStringsTable sst = r.getSharedStringsTable();

			XMLReader parser = fetchSheetParser(sst);

			// Iterator<InputStream> sheets = r.getSheetsData();
			SheetIterator sheets = (SheetIterator) r.getSheetsData();
			String sheetName = null;
			int sheetNum = 0;
			while (sheets.hasNext()) {
				sheet = sheets.next();
				if(sheetNum == 0){
					sheetName = sheets.getSheetName();
				}
				InputSource sheetSource = new InputSource(sheet);
				parser.parse(sheetSource);
				sheet.close();

				map.put(sheetNum, this.sheetData);
				this.sheetData = new ArrayList<String[]>();
				sheetNum++;
				curRow = 0;
			}
			List<String[]> list = new ArrayList<String[]>();
			list.add(new String[]{sheetName});
			this.setSheetNames(list);
		} catch (InvalidFormatException e) {
			throw new RuntimeException(e.getMessage());
		} catch (IOException e) {
			throw new RuntimeException(e.getMessage());
		} catch (OpenXML4JException e) {
			throw new RuntimeException(e.getMessage());
		} catch (SAXException e) {
			throw new RuntimeException(e.getMessage());
		} finally {
			try {
				pkg.close();
				sheet.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				throw new RuntimeException(e.getMessage());
			}
		}
	}

	/**
	 * 读取第一个工作簿的入口方法
	 * 
	 * @param path
	 * @throws RuntimeException
	 */
	private void readOneSheet(String path) throws RuntimeException {
		// TODO Auto-generated method stub
		OPCPackage pkg = null;
		InputStream sheet = null;
		try {
			pkg = OPCPackage.open(path);
			XSSFReader r = new XSSFReader(pkg);
			SharedStringsTable sst = r.getSharedStringsTable();
			XMLReader parser = fetchSheetParser(sst);
			sheet = r.getSheet("rId1");
			InputSource sheetSource = new InputSource(sheet);
			parser.parse(sheetSource);
			map.put(0, this.sheetData);
			this.sheetData.clear();
		} catch (InvalidFormatException e) {
			throw new RuntimeException(e.getMessage());
		} catch (IOException e) {
			throw new RuntimeException(e.getMessage());
		} catch (OpenXML4JException e) {
			throw new RuntimeException(e.getMessage());
		} catch (SAXException e) {
			throw new RuntimeException(e.getMessage());
		} finally {
			try {
				pkg.close();
				sheet.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				throw new RuntimeException(e.getMessage());
			}
		}
	}

	private XMLReader fetchSheetParser(SharedStringsTable sst)
			throws RuntimeException {
		// TODO Auto-generated method stub
		XMLReader parser;
		try {
			parser = XMLReaderFactory
					.createXMLReader("org.apache.xerces.parsers.SAXParser");
			this.sst = sst;
			parser.setContentHandler(this);
			return parser;
		} catch (SAXException e) {
			// TODO Auto-generated catch block
			throw new RuntimeException(e.getMessage());
		}

	}

	public void startElement(String uri, String localName, String name,
			Attributes attributes) throws SAXException {
		// c => 单元格
		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");

			// 如果下一个元素是 SST 的索引，则将nextIsString标记为true
			String cellType = attributes.getValue("t");
			if (cellType != null && cellType.equals("s")) {
				nextIsString = true;
			} else {
				nextIsString = false;
			}
		}
		// 置空
		lastContents = "";
	}

	public void endElement(String uri, String localName, String name)
			throws SAXException {
		// 根据SST的索引值的到单元格的真正要存储的字符串
		// 这时characters()方法可能会被调用多次
		if (nextIsString) {
			try {
				int idx = Integer.parseInt(lastContents);
				lastContents = new XSSFRichTextString(sst.getEntryAt(idx))
						.toString();
				nextIsString = false;
			} catch (Exception e) {
				e.printStackTrace();
			}
		}

		// v => 单元格的值，如果单元格是字符串则v标签的值为该字符串在SST中的索引
		// 将单元格内容加入rowlist中，在这之前先去掉字符串前后的空白符
		if (name.equals("v")) {
			String value = lastContents.trim();
//			if (value.equals("销售与客服支撑")) {
//				System.out.println();
//			}

			// 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++) {
					rowData.add(limit, "");
					limit++;
				}
			} else if (ref.equals(preRef) && limit == 0 && !ref.contains("A")) {
            	int len = letterToNum(ref);
                for(int i=0;i<len-1;i++){  
                    rowData.add(limit,"");
                    limit++; 
                }  
			}

			rowData.add(limit, value);
			limit++;
		} else if (name.equals("row")) {
			// 如果标签名称为 row ，这说明已到行尾，调用 optRows() 方法
			// System.out.println(rowData);
			if(curRow == titleRow) {
        		maxlimit = limit;
        	}else if(curRow == 0) {
        		maxlimit = limit;
        	}
			if (limit != maxlimit) {
				int len = maxlimit - limit;
				for (int i = 0; i < len; i++) {
					rowData.add(limit, "");
					limit++;
				}
			}
			sheetData.add(rowData.toArray(new String[limit]));
			rowData.clear();
			limit = 0;
			curRow++;
			preRef = null;
			ref = null;
		}
	}

	/**
	 * 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;
	}

	public void characters(char[] ch, int start, int length)
			throws SAXException {
		// 得到单元格内容的值
		lastContents += new String(ch, start, length);
	}
	
	// 将字母转换成数字
	public int letterToNum(String input) {
		
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < input.length(); i++) {
			char c = input.charAt(i);
			if ((c <= 'z' && c >= 'a') || (c <= 'Z' && c >= 'A')) {
				sb.append(c);
			}
		}
		
		StringBuilder builder = new StringBuilder();
		for (byte b : sb.toString().toLowerCase().getBytes()) {
			builder.append(b - 96);
		}
		return Integer.valueOf(builder.toString());
	}
}