poi 工具类

package cn.etstone.dashboard.zuul.util;

 

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

 

import org.apache.poi.EncryptedDocumentException;

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;

import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.DateUtil;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.ss.usermodel.WorkbookFactory;

import org.apache.poi.xssf.usermodel.XSSFCellStyle;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

 

public class ExcelUtil {

private static final String CELL_DATE_FORMAT = "yyyy-MM-dd";

private Workbook workbook;

private Sheet currentSheet;

private Row currentRow;

public Workbook getWorkbook() {

return workbook;

}

public void setWorkbook(Workbook workbook) {

this.workbook = workbook;

}

public Sheet getCurrentSheet() {

return currentSheet;

}

public void setCurrentSheet(Sheet currentSheet) {

this.currentSheet = currentSheet;

}

public Row getCurrentRow() {

return currentRow;

}

 

 

public void setCurrentRow(Row currentRow) {

this.currentRow = currentRow;

}

public ExcelUtil openWorkBook(){

this.workbook = new XSSFWorkbook();

return this;

}

 

/**

* 打开工作薄

* @param is

* @return

* @throws EncryptedDocumentException

* @throws InvalidFormatException

* @throws IOException

*/

public ExcelUtil openWorkBook(InputStream is) throws Exception{

this.workbook = WorkbookFactory.create(is);

is.close();

return this;

}

/**

* 打开工作薄

* @param fileName

* @return

* @throws IOException

* @throws EncryptedDocumentException

* @throws InvalidFormatException

*/

public ExcelUtil openWorkBook(String fileName) throws IOException, EncryptedDocumentException, InvalidFormatException{

FileInputStream fis = new FileInputStream(fileName.trim());

this.workbook = WorkbookFactory.create(fis);

return this;

}

/**

* 打开第index个sheet

* @param index

* @return

* @throws IndexOutOfBoundsException

*/

public ExcelUtil getSheet(int index) throws IndexOutOfBoundsException{

if(index >= this.getSheetCount()){

throw new IndexOutOfBoundsException("index必须在0-" + this.getSheetCount() + "之间");

}

validateWorkBook(this.workbook);

this.currentSheet = this.workbook.getSheetAt(index);

return this;

}

/**

* 根据sheet名称打开sheet

* @param name

* @return

* @throws IllegalArgumentException

* @throws IllegalStateException

*/

public ExcelUtil getSheet(String name) throws IllegalArgumentException, IllegalStateException{

if(name == null || name.trim().isEmpty()){

throw new IllegalArgumentException("Sheet名称不能为null和空字符串");

}

validateWorkBook(this.workbook);

this.currentSheet = this.workbook.getSheet(name.trim());

if(this.currentSheet == null){

throw new IllegalStateException("Sheet'" + name + "'不存在");

}

return this;

}

/**

* 新建一个sheet

* @param sheetName 新sheet的名称

* @return

*/

public ExcelUtil createSheet(String sheetName){

if(sheetName == null || sheetName.trim().isEmpty()){

throw new IllegalArgumentException("Sheet名称不能为null和空字符串");

}

validateWorkBook(this.workbook);

this.currentSheet = this.workbook.getSheet(sheetName.trim());

if(this.currentSheet == null){

this.currentSheet = this.workbook.createSheet(sheetName.trim());

}

return this;

}

/**

* 创建一行信息, 如果该行已经有内容则定位到该行(不修改内容)

* @param rowNum

* @return

*/

public ExcelUtil createRow(int rowNum){

validateSheet(this.currentSheet);

if(rowNum < 0){

throw new IndexOutOfBoundsException("行号必须不能小于0");

}

this.currentRow = this.currentSheet.getRow(rowNum);

if(this.currentRow == null){

this.currentRow = this.currentSheet.createRow(rowNum);

}

return this;

}

/**

* 修改指定行的内容

* @param rowNum 要修改的行号

* @param row 新内容

* @param startCell 新内容开始写入的列号

* @return

*/

public ExcelUtil setRow(int rowNum, List