poi读取excel的列和删除列

(各自根据具体的poi版本进行相应的替换即可)


package com.br.loan.strategy.common.utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

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

/**
* @Company:
* @Author: shaobin.fu
* @Date: 2018/9/6 16:33
* @Description:
*/
@Slf4j
public class Excel {
//总行数
private int totalRows = 0;
//总列数
private int totalCells = 0;
//错误信息
private String errorInfo;

public Excel() {
}

//得到总行数
public int getTotalRows() {
return totalRows;
}

//得到总行数
public int getTotalCells() {
return totalCells;
}

//得到错误信息
public String getErrorInfo() {
return errorInfo;
}

/**
* @描述:验证excel文件
* @时间:2012-08-29 下午16:27:15
* @参数:@param filePath 文件完整路径
* @参数:@return
* @返回值:boolean
*/
public boolean validateExcel(String filePath) {
/** 检查文件名是否为空或者是否是Excel格式的文件 */
if (filePath == null || !(WDWUtil.isExcel2003(filePath) || WDWUtil.isExcel2007(filePath))) {
errorInfo = "文件名不是excel格式";
return false;
}
/** 检查文件是否存在 */
File file = new File(filePath);
if (file == null || !file.exists()) {
errorInfo = "文件不存在";
return false;
}
return true;
}

/**
* @描述:根据文件名读取excel文件
* @时间:2012-08-29 下午16:27:15
* @参数:@param filePath 文件完整路径
* @参数:@return
* @返回值:List
*/
public List<List<String>> read(String filePath) {
List<List<String>> dataLst = new ArrayList<List<String>>();
InputStream is = null;
try {
/** 验证文件是否合法 */
if (!validateExcel(filePath)) {
System.out.println(errorInfo);
return null;
}
/** 判断文件的类型,是2003还是2007 */
boolean isExcel2003 = true;
if (WDWUtil.isExcel2007(filePath)) {
isExcel2003 = false;
}
/** 调用本类提供的根据流读取的方法 */
File file = new File(filePath);
is = new FileInputStream(file);
dataLst = read(is, isExcel2003);
is.close();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
is = null;
e.printStackTrace();
}
}
}
/** 返回最后读取的结果 */
return dataLst;
}

/**
* @描述:根据文件名读取excel文件,以列讀取
* @时间:2012-08-29 下午16:27:15
* @参数:@param filePath 文件完整路径
* @参数:@return
* @返回值:List
*/

/*public Map<Integer, Integer> readByColumn(String filePath) {

Map<Integer, Integer> dataLst = new HashMap<>();
InputStream is = null;
try {
*//** 验证文件是否合法 *//*
if (!validateExcel(filePath)) {
System.out.println(errorInfo);
return null;
}
*//** 判断文件的类型,是2003还是2007 *//*
boolean isExcel2003 = true;
if (WDWUtil.isExcel2007(filePath)) {
isExcel2003 = false;
}
*//** 调用本类提供的根据流读取的方法 *//*
File file = new File(filePath);
is = new FileInputStream(file);
dataLst = readByColumn(is, isExcel2003);
is.close();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
is = null;
e.printStackTrace();
}
}
}
*//** 返回最后读取的结果 *//*
return dataLst;
}*/

/**
* @描述:根据流读取Excel文件
* @时间:2012-08-29 下午16:40:15
* @参数:@param inputStream
* @参数:@param isExcel2003
* @参数:@return
* @返回值:List
*/

public List<List<String>> read(InputStream inputStream, boolean isExcel2003) {

List<List<String>> dataLst = null;
try {
/** 根据版本选择创建Workbook的方式 */
Workbook wb = null;
if (isExcel2003) {
wb = new HSSFWorkbook(inputStream);
} else {
wb = new XSSFWorkbook(inputStream);
}
dataLst = read(wb);
} catch (IOException e) {
e.printStackTrace();
}
return dataLst;

}

/**
* @描述:根据流读取Excel文件,以列讀取
* @时间:2012-08-29 下午16:40:15
* @参数:@param inputStream
* @参数:@param isExcel2003
* @参数:@return
* @返回值:List
*/

public Map<Integer, Integer> readByColumn(InputStream inputStream, boolean isExcel2003) {
Map<Integer, Integer> dataLst = null;
try {
/** 根据版本选择创建Workbook的方式 */
Workbook wb = null;
if (isExcel2003) {
wb = new HSSFWorkbook(inputStream);
} else {
wb = new XSSFWorkbook(inputStream);
}
dataLst = readByColumn(wb);
} catch (IOException e) {
e.printStackTrace();
}
return dataLst;
}

/**
* @描述:读取数据,以行读取
* @时间:2012-08-29 下午16:50:15
* @参数:@param Workbook
* @参数:@return
* @返回值:List<List<String>>
*/

private List<List<String>> read(Workbook wb) {

List<List<String>> dataLst = new ArrayList<List<String>>();
/** 得到第一个shell */
Sheet sheet = wb.getSheetAt(0);
/** 得到Excel的行数 */
this.totalRows = sheet.getPhysicalNumberOfRows();
/** 得到Excel的列数 */
if (this.totalRows >= 1 && sheet.getRow(0) != null) {
this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}

/** 循环Excel的行 */

for (int r = 0; r < this.totalRows; r++) {
Row row = sheet.getRow(r);
if (row == null) {
continue;
}
List<String> rowLst = new ArrayList<String>();

/** 循环Excel的列 */
for (int c = 0; c < this.getTotalCells(); c++) {
Cell cell = row.getCell(c);
String cellValue = "";
if (null != cell) {
// 以下是判断数据的类型
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC: // 数字
cellValue = cell.getNumericCellValue() + "";
break;

case HSSFCell.CELL_TYPE_STRING: // 字符串
cellValue = cell.getStringCellValue();
break;

case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
cellValue = cell.getBooleanCellValue() + "";
break;

case HSSFCell.CELL_TYPE_FORMULA: // 公式
cellValue = cell.getCellFormula() + "";
break;

case HSSFCell.CELL_TYPE_BLANK: // 空值
cellValue = "";
break;

case HSSFCell.CELL_TYPE_ERROR: // 故障
cellValue = "非法字符";
break;

default:
cellValue = "未知类型";
break;
}
}
rowLst.add(cellValue);
}
/** 保存第r行的第c列 */
dataLst.add(rowLst);
}
return dataLst;
}

/**
* @描述:读取数据,以列读取
* @时间:2012-08-29 下午16:50:15
* @参数:@param Workbook
* @参数:@return
* @返回值:List<List<String>>
*/
public Map<Integer, Integer> readByColumn(SXSSFWorkbook wb) {

Map<Integer, Integer> dataMap = new LinkedHashMap<>();
/** 得到第一个shell */
Sheet sheet = wb.getSheetAt(0);
/** 得到Excel的行数 */
this.totalRows = sheet.getPhysicalNumberOfRows();
/** 得到Excel的列数 */
if (this.totalRows >= 1 && sheet.getRow(0) != null) {
this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}
//从第九列开始
for (int lie = 9; lie <= totalCells; lie++) {
//设置为1,代表不需要删除,为0,则删除。
dataMap.put(lie, 0);
}
/** 循环Excel的行(不包括第一行) */
for (int r = 1; r < this.totalRows; r++) {
Row row = sheet.getRow(r);
if (row == null) {
continue;
}
/** 循环Excel的列 */
for (int c = 0; c < this.getTotalCells(); c++) {
Cell cell = row.getCell(c);

if (null != cell&&StringUtils.isNotEmpty(cell)) {
dataMap.put(c+1, 1);
}
}
}
return dataMap;
}
/**
* @描述:读取sheet数据,以列读取
* @时间:2012-08-29 下午16:50:15
* @参数:@param Workbook
* @参数:@return
* @返回值:List<List<String>>
*/
public Map<Integer, Integer> readSheetByColumn(Sheet sheet) {

Map<Integer, Integer> dataMap = new LinkedHashMap<>();
/** 得到第一个shell */
/** 得到Excel的行数 */
this.totalRows = sheet.getPhysicalNumberOfRows();
/** 得到Excel的列数 */
if (this.totalRows >= 1 && sheet.getRow(0) != null) {
this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}
//从第九列开始
for (int lie = 9; lie <= totalCells; lie++) {
//设置为1,代表不需要删除,为0,则删除。
dataMap.put(lie, 0);
}
/** 循环Excel的行(不包括第一行) */
for (int r = 1; r < this.totalRows; r++) {
Row row = sheet.getRow(r);
if (row == null) {
continue;
}
/** 循环Excel的列 */
for (int c = 0; c < this.getTotalCells(); c++) {
Cell cell = row.getCell(c);

if (null != cell&&StringUtils.isNotEmpty(cell)) {
dataMap.put(c+1, 1);
}
}
}
return dataMap;
}

/**
* 删除列
* @param sheet
* @param columnToDelete
*/
public void deleteColumn(SXSSFSheet sheet, int columnToDelete) {
for (int rId = 0; rId <= sheet.getLastRowNum(); rId++) {
Row row = sheet.getRow(rId);
for (int cID = columnToDelete; cID <= row.getLastCellNum(); cID++) {
Cell cOld = row.getCell(cID);
if (cOld != null) {
row.removeCell(cOld);
}
Cell cNext = row.getCell(cID + 1);
if (cNext != null) {
Cell cNew = row.createCell(cID, cNext.getCellTypeEnum());
cloneCell(cNew, cNext);
//Set the column width only on the first row.
//Other wise the second row will overwrite the original column width set previously.
if (rId == 0) {
sheet.setColumnWidth(cID, sheet.getColumnWidth(cID + 1));

}
}
}
}
}

/**
* 右边列左移
* @param cNew
* @param cOld
*/
private void cloneCell(Cell cNew, Cell cOld) {
cNew.setCellComment(cOld.getCellComment());
cNew.setCellStyle(cOld.getCellStyle());

if (CellType.BOOLEAN == cNew.getCellTypeEnum()) {
cNew.setCellValue(cOld.getBooleanCellValue());
} else if (CellType.NUMERIC == cNew.getCellTypeEnum()) {
cNew.setCellValue(cOld.getNumericCellValue());
} else if (CellType.STRING == cNew.getCellTypeEnum()) {
cNew.setCellValue(cOld.getStringCellValue());
} else if (CellType.ERROR == cNew.getCellTypeEnum()) {
cNew.setCellValue(cOld.getErrorCellValue());
} else if (CellType.FORMULA == cNew.getCellTypeEnum()) {
cNew.setCellValue(cOld.getCellFormula());
}
}

/**
* 读取第一行的cell数据
*/
public List<String> readFirstRow(SXSSFWorkbook wb) {
log.info("进入readFirstRow");
List<String> list = new ArrayList<>();
int totalColumn=0;
/** 得到第一个shell */
Sheet sheet = wb.getSheetAt(0);
/** 得到Excel的列数 */
if (sheet.getRow(0) != null) {
totalColumn = sheet.getRow(0).getPhysicalNumberOfCells();
log.info("totalColumn:{}",totalColumn);
for (int lie = 8; lie < totalColumn; lie++) {
log.info("lie:{}",sheet.getRow(0).getCell(lie).getStringCellValue());
list.add(sheet.getRow(0).getCell(lie).getStringCellValue());
}
}
log.info("readFirst的大小:{}",list.size());
return list;
}

/*public static void main(String[] args) {
File file = new File("C:\\Users\\Bairong\\Desktop\\sjfksj.xlsx");
Excel excel = new Excel();
try {
FileInputStream is = new FileInputStream(file);
Workbook wb = new XSSFWorkbook(is);
Map<Integer, Integer> stringIntegerMap = excel.readByColumn(wb);
Iterator<Map.Entry<Integer, Integer>> it = stringIntegerMap.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<Integer, Integer> entry = it.next();
System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
if (entry.getValue()==0){
excel.deleteColumn(wb.getSheetAt(0),entry.getKey()-1);
}
}

FileOutputStream fileOut = new FileOutputStream(file);
wb.write(fileOut);
fileOut.close();
//excel.deleteColumn(sheet,1);
System.out.println("删除成功");
} catch (Exception e) {
e.printStackTrace();
}
}*/
}

/**
* @描述:工具类
* @时间:2012-08-29 下午16:30:40
*/

class WDWUtil {

/**
* @描述:是否是2003的excel,返回true是2003
* @时间:2012-08-29 下午16:29:11
* @参数:@param filePath 文件完整路径
* @参数:@return
* @返回值:boolean
*/

public static boolean isExcel2003(String filePath) {

return filePath.matches("^.+\\.(?i)(xls)$");

}

/**
* @描述:是否是2007的excel,返回true是2007
* @时间:2012-08-29 下午16:28:20
* @参数:@param filePath 文件完整路径
* @参数:@return
* @返回值:boolean
*/

public static boolean isExcel2007(String filePath) {

return filePath.matches("^.+\\.(?i)(xlsx)$");

}

public static void main(String[] args) {
List list1 = new ArrayList();
List list2 = new ArrayList();
list1.add("乾隆");
list1.add("李世民");
list2.add("康熙");
list2.add("李世");
for(int i=0;i<list1.size();i++){
if (list1.contains(list2.get(i))){
System.out.println("结果为true");
}else {
System.out.println("不等");
}
}

}

}

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转载自www.cnblogs.com/tiger-fu/p/9647054.html