- 下载poi jar包
- 导入工具类
ExcelParseUtils
package com.example.utils;
import org.apache.poi.hssf.usermodel.*;
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;
import java.io.*;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
/**
* Created by EthanWalker on 2017/9/12.
*/
public class ExcelParseUtils {
//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(File file) {
if (file == null) {
return null;
}
if (file.getName().endsWith("xlsx")) {
//处理ecxel2007
return readExcel2007(file);
} else {
//处理ecxel2003
return readExcel2003(file);
}
}
/*
* @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(File file) {
try {
ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
ArrayList<Object> colList;
HSSFWorkbook wb = new HSSFWorkbook(new FileInputStream(file));
HSSFSheet sheet = wb.getSheetAt(0);
HSSFRow row;
HSSFCell cell;
Object value;
// help(wb,sheet,row,cell,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 = 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 switch
colList.add(value);
}//end for j
rowList.add(colList);
}//end for i
return rowList;
} catch (Exception e) {
return null;
}
}
public static ArrayList<ArrayList<Object>> readExcel2007(File file) {
try {
ArrayList<ArrayList<Object>> rowList = new ArrayList<ArrayList<Object>>();
ArrayList<Object> colList;
XSSFWorkbook wb = new XSSFWorkbook(new FileInputStream(file));
XSSFSheet sheet = wb.getSheetAt(0);
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 = 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 switch
colList.add(value);
}//end for j
rowList.add(colList);
}//end for i
return rowList;
} catch (Exception e) {
System.out.println("exception");
return null;
}
}
public static void writeExcel(ArrayList<ArrayList<Object>> result, String path) {
if (result == null) {
return;
}
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("sheet1");
for (int i = 0; i < result.size(); i++) {
HSSFRow row = sheet.createRow(i);
if (result.get(i) != null) {
for (int j = 0; j < result.get(i).size(); j++) {
HSSFCell cell = row.createCell(j);
cell.setCellValue(result.get(i).get(j).toString());
}
}
}
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
wb.write(os);
} catch (IOException e) {
e.printStackTrace();
}
byte[] content = os.toByteArray();
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 (Exception e) {
e.printStackTrace();
}
}
public static DecimalFormat getDf() {
return df;
}
public static void setDf(DecimalFormat df) {
ExcelParseUtils.df = df;
}
public static SimpleDateFormat getSdf() {
return sdf;
}
public static void setSdf(SimpleDateFormat sdf) {
ExcelParseUtils.sdf = sdf;
}
public static DecimalFormat getNf() {
return nf;
}
public static void setNf(DecimalFormat nf) {
ExcelParseUtils.nf = nf;
}
}
- 使用
public static void main(String[] args) {
File file = new File("C:/excel/a.xlsx");
ArrayList<ArrayList<Object>> result = ExcelUtil.readExcel(file);
for(int i = 0 ;i < result.size() ;i++){
for(int j = 0;j<result.get(i).size(); j++){
System.out.println(i+"行 "+j+"列 "+ result.get(i).get(j).toString());
}
}
ExcelUtil.writeExcel(result,"C:/excel/bb.xls");
}
