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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Copyright (C) 2008 feilong
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.feilong.excel.writer;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
class CellStyleSetter{
/** Don't let anyone instantiate this class. */
private CellStyleSetter(){
//AssertionError不是必须的. 但它可以避免不小心在类的内部调用构造器. 保证该类在任何情况下都不会被实例化.
//see 《Effective Java》 2nd
throw new AssertionError("No " + getClass().getName() + " instances for you!");
}
//---------------------------------------------------------------
/**
* 设置 cell style.
*
* @param sheet
* the sheet
* @param rowIndex
* the row index
* @param cellIndex
* the cell index
* @param cellStyle
* the style
*/
static void set(Sheet sheet,int rowIndex,int cellIndex,CellStyle cellStyle){
if (cellStyle == null){
return;
}
//---------------------------------------------------------------
Row row = sheet.getRow(rowIndex);
if (row == null){
row = sheet.createRow(rowIndex);
}
Cell cell = row.getCell(cellIndex);
if (cell == null){
cell = row.createCell(cellIndex);
}
//---------------------------------------------------------------
CellStyle currentCellStyle = cell.getCellStyle();
if (currentCellStyle == null || (cell.getCellType() != CellType.NUMERIC) || (!DateUtil.isCellDateFormatted(cell))
|| DateUtil.isADateFormat(cellStyle.getDataFormat(), cellStyle.getDataFormatString())){
cell.setCellStyle(cellStyle);
}else{
CellStyle newCellStyle = sheet.getWorkbook().createCellStyle();
newCellStyle.cloneStyleFrom(cellStyle);
newCellStyle.setDataFormat(currentCellStyle.getDataFormat());
cell.setCellStyle(newCellStyle);
}
}
}