Java之按行、列读excel笔记

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原文

首先jar包地址：https://pan.baidu.com/s/1hrPilta
或者自己去poi官网去下载。

核心工具类

package com.beforeship.excel;import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;public class ExcelUtil
{//默认单元格内容为数字时格式private static DecimalFormat df = new DecimalFormat("0");// 默认单元格格式化日期字符串private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化数字private static DecimalFormat nf = new DecimalFormat("0.00");public static ArrayList<ArrayList<Object>> readExcel(final File file, final Integer onesheet){if (file == null){return null;}if (file.getName().endsWith("xlsx")){//处理ecxel2007return readExcel2007(file, onesheet);}else{//处理ecxel2003return readExcel2003(file, onesheet);}}/** @return 将返回结果存储在ArrayList内，存储结构与二位数组类似 lists.get(0).get(0)表示过去Excel中0行0列单元格*/public static ArrayList<ArrayList<Object>> readExcel2003(final File file, final Integer onesheet){try{final ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();ArrayList<Object> colList;final HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));final HSSFSheet sheet = wb.getSheetAt(onesheet);HSSFRow row;HSSFCell cell;Object value;for (int i = sheet.getFirstRowNum(), rowCount = 0; rowCount < sheet.getPhysicalNumberOfRows(); i++){row = sheet.getRow(i);colList = new ArrayList<Object>();if (row == null){//当读取行为空时if (i != sheet.getPhysicalNumberOfRows()){//判断是否是最后一行rowList.add(colList);}continue;}else{rowCount++;}for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++){cell = row.getCell(j);if (cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){//当该单元格为空if (j != row.getLastCellNum()){//判断是否是该行中最后一个单元格colList.add("");}continue;}switch (cell.getCellType()){case XSSFCell.CELL_TYPE_STRING://System.out.println(i + "行" + j + " 列 is String type");value = cell.getStringCellValue();break;case XSSFCell.CELL_TYPE_NUMERIC:if ("@".equals(cell.getCellStyle().getDataFormatString())){value = df.format(cell.getNumericCellValue());}else if ("General".equals(cell.getCellStyle().getDataFormatString())){value = nf.format(cell.getNumericCellValue());}else{value = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));}//System.out.println(i + "行" + j + " 列 is Number type ; DateFormt:" + value.toString());break;case XSSFCell.CELL_TYPE_BOOLEAN://  System.out.println(i + "行" + j + " 列 is Boolean type");value = Boolean.valueOf(cell.getBooleanCellValue());break;case XSSFCell.CELL_TYPE_BLANK://  System.out.println(i + "行" + j + " 列 is Blank type");value = "";break;default://  System.out.println(i + "行" + j + " 列 is default type");value = cell.toString();}// end switchcolList.add(value);} //end for jrowList.add(colList);} //end for ireturn rowList;}catch (final Exception e){return null;}}public static ArrayList<ArrayList<Object>> readExcel2007(final File file, final Integer onesheet){try{final ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();ArrayList<Object> colList;final XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(file));final XSSFSheet sheet = wb.getSheetAt(onesheet);XSSFRow row;XSSFCell cell;Object value;for (int i = sheet.getFirstRowNum(), rowCount = 0; rowCount < sheet.getPhysicalNumberOfRows(); i++){row = sheet.getRow(i);colList = new ArrayList<Object>();if (row == null){//当读取行为空时if (i != sheet.getPhysicalNumberOfRows()){//判断是否是最后一行rowList.add(colList);}continue;}else{rowCount++;}for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++){cell = row.getCell(j);if (cell == null || cell.getCellType() == HSSFCell.CELL_TYPE_BLANK){//当该单元格为空if (j != row.getLastCellNum()){//判断是否是该行中最后一个单元格colList.add("");}continue;}switch (cell.getCellType()){case XSSFCell.CELL_TYPE_STRING://System.out.println(i + "行" + j + " 列 is String type");value = cell.getStringCellValue();break;case XSSFCell.CELL_TYPE_NUMERIC:if ("@".equals(cell.getCellStyle().getDataFormatString())){value = df.format(cell.getNumericCellValue());}else if ("General".equals(cell.getCellStyle().getDataFormatString())){value = nf.format(cell.getNumericCellValue());}else{value = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));}//System.out.println(i + "行" + j + " 列 is Number type ; DateFormt:" + value.toString());break;case XSSFCell.CELL_TYPE_BOOLEAN://System.out.println(i + "行" + j + " 列 is Boolean type");value = Boolean.valueOf(cell.getBooleanCellValue());break;case XSSFCell.CELL_TYPE_BLANK://  System.out.println(i + "行" + j + " 列 is Blank type");value = "";break;default://System.out.println(i + "行" + j + " 列 is default type");value = cell.toString();}// end switchcolList.add(value);} //end for jrowList.add(colList);} //end for ireturn rowList;}catch (final Exception e){//System.out.println("exception");return null;}}public static void writeExcel(final ArrayList<ArrayList<Object>> result, final String path){if (result == null){return;}final HSSFWorkbook wb = new HSSFWorkbook();final HSSFSheet sheet = wb.createSheet("sheet1");for (int i = 0; i < result.size(); i++){final HSSFRow row = sheet.createRow(i);if (result.get(i) != null){for (int j = 0; j < result.get(i).size(); j++){final HSSFCell cell = row.createCell(j);cell.setCellValue(result.get(i).get(j).toString());}}}final ByteArrayOutputStream os = new ByteArrayOutputStream();try{wb.write(os);}catch (final IOException e){e.printStackTrace();}final byte[] content = os.toByteArray();final File file = new File(path);//Excel文件生成后存储的位置。OutputStream fos = null;try{fos = new FileOutputStream(file);fos.write(content);os.close();fos.close();}catch (final Exception e){e.printStackTrace();}}public static DecimalFormat getDf(){return df;}public static void setDf(final DecimalFormat df){ExcelUtil.df = df;}public static SimpleDateFormat getSdf(){return sdf;}public static void setSdf(final SimpleDateFormat sdf){ExcelUtil.sdf = sdf;}public static DecimalFormat getNf(){return nf;}public static void setNf(final DecimalFormat nf){ExcelUtil.nf = nf;}}

调用工具，按行读取、返回数据

    public static ArrayList<String> getHeadOfThird(final String filePath) throws Exception{final File file = new File(filePath);final ArrayList<String> data2 = new ArrayList<>();final ArrayList<String> data3 = new ArrayList<>();final Integer sheet = 3;final ArrayList<ArrayList<Object>> result = ExcelUtil.readExcel(file, sheet);for (int j = 0; j < result.get(1).size(); j++){data2.add(result.get(1).get(j).toString());}for (int j = 0; j < result.get(2).size(); j++){data3.add(result.get(2).get(j).toString());}//System.out.println("头部第三行：" + data2);return data3;}

按列读取、返回数据(行读取比较好读，按列相对麻烦些)

public static RequireOptionPreferred getRequireOption(final String filePath) throws Exception{final File file = new File(filePath);final ArrayList<ArrayList<Object>> result = ExcelUtil.readExcel(file, 2);final ArrayList<String> requireWord = new ArrayList<>();final ArrayList<String> optionalWord = new ArrayList<>();final ArrayList<String> preferredWord = new ArrayList<>();for (int i = 0; i < result.size(); i++){for (int j = 0; j < result.get(i).size(); j++){final String tmpRequired = "Required";if (tmpRequired.equals(result.get(i).get(j).toString())){requireWord.add(result.get(i).get(1).toString());}final String tmpOptional = "Optional";if (tmpOptional.equals(result.get(i).get(j).toString())){optionalWord.add(result.get(i).get(1).toString());}final String tmpPreferred = "Preferred";if (tmpPreferred.equals(result.get(i).get(j).toString())){preferredWord.add(result.get(i).get(1).toString());}}}final RequireOptionPreferred requireOptionPreferred = new RequireOptionPreferred();requireOptionPreferred.setOptionalWord(optionalWord);requireOptionPreferred.setOptionalWord(optionalWord);requireOptionPreferred.setPreferredWord(preferredWord);//System.out.println(requireOptionPreferred);return requireOptionPreferred;}