java POI 单元格格式设置居中

设置颜色,设置前景色

style.setFillForegroundColor(HSSFColor.HSSFColorPredefined.GREY_25_PERCENT.getIndex());
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);

设置居中对齐

//设置水平对齐的样式为居中对齐;  
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//设置垂直对齐的样式为居中对齐; 
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

自适应宽度

//自动设置行高
int colLength = cell.getStringCellValue().getBytes().length*256;  //
sheet.setColumnWidth(col, colLength);

package com.hwt.glmf.common;
 
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
 
import javax.servlet.http.HttpServletResponse;
 
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
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.hssf.util.CellRangeAddress;
import org.apache.poi.hssf.util.HSSFColor;
 
/**
 * 导出Excel公共方法
 * @version 1.0
 * 
 * @author wangcp
 *
 */
public class ExportExcel extends BaseAction {
        
        //显示的导出表的标题
        private String title;
        //导出表的列名
        private String[] rowName ;
        
        private List<Object[]>  dataList = new ArrayList<Object[]>();
        
        HttpServletResponse  response;
        
        //构造方法,传入要导出的数据
        public ExportExcel(String title,String[] rowName,List<Object[]>  dataList){
                this.dataList = dataList;
                this.rowName = rowName;
                this.title = title;
        }
                        
        /*
         * 导出数据
         * */
        public void export() throws Exception{
                try{
                        HSSFWorkbook workbook = new HSSFWorkbook();                                             // 创建工作簿对象
                        HSSFSheet sheet = workbook.createSheet(title);                                  // 创建工作表
                        
                        // 产生表格标题行
                HSSFRow rowm = sheet.createRow(0);
                HSSFCell cellTiltle = rowm.createCell(0);
                
                //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
                HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
                HSSFCellStyle style = this.getStyle(workbook);                                  //单元格样式对象
                
                sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1)));  
                cellTiltle.setCellStyle(columnTopStyle);
                cellTiltle.setCellValue(title);
                
                        // 定义所需列数
                        int columnNum = rowName.length;
                        HSSFRow rowRowName = sheet.createRow(2);                                // 在索引2的位置创建行(最顶端的行开始的第二行)
                        
                        // 将列头设置到sheet的单元格中
                        for(int n=0;n<columnNum;n++){
                                HSSFCell  cellRowName = rowRowName.createCell(n);                               //创建列头对应个数的单元格
                                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);                             //设置列头单元格的数据类型
                        HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                        cellRowName.setCellValue(text);                                                                 //设置列头单元格的值
                        cellRowName.setCellStyle(columnTopStyle);                                               //设置列头单元格样式
                }
                        
                //将查询出的数据设置到sheet对应的单元格中
                        for(int i=0;i<dataList.size();i++){
                                
                                Object[] obj = dataList.get(i);//遍历每个对象
                                HSSFRow row = sheet.createRow(i+3);//创建所需的行数
                                
                                for(int j=0; j<obj.length; j++){
                                        HSSFCell  cell = null;   //设置单元格的数据类型
                                        if(j == 0){
                                                cell = row.createCell(j,HSSFCell.CELL_TYPE_NUMERIC);
                                                cell.setCellValue(i+1); 
                                        }else{
                                                cell = row.createCell(j,HSSFCell.CELL_TYPE_STRING);
                                                if(!"".equals(obj[j]) && obj[j] != null){
                                                        cell.setCellValue(obj[j].toString());                                           //设置单元格的值
                                                }
                                        }
                                        cell.setCellStyle(style);                                                                       //设置单元格样式
                                }
                        }
                        //让列宽随着导出的列长自动适应
                        for (int colNum = 0; colNum < columnNum; colNum++) {
                    int columnWidth = sheet.getColumnWidth(colNum) / 256;
                    for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                        HSSFRow currentRow;
                        //当前行未被使用过
                        if (sheet.getRow(rowNum) == null) {
                            currentRow = sheet.createRow(rowNum);
                        } else {
                            currentRow = sheet.getRow(rowNum);
                        }
                        if (currentRow.getCell(colNum) != null) {
                            HSSFCell currentCell = currentRow.getCell(colNum);
                            if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                                int length = currentCell.getStringCellValue().getBytes().length;
                                if (columnWidth < length) {
                                    columnWidth = length;
                                }
                            }
                        }
                    }
                    if(colNum == 0){
                        sheet.setColumnWidth(colNum, (columnWidth-2) * 256);
                    }else{
                        sheet.setColumnWidth(colNum, (columnWidth+4) * 256);
                    }
                }
                        
                        if(workbook !=null){
                                try
                            {
                                String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
                                String headStr = "attachment; filename=\"" + fileName + "\"";
                                response = getResponse();
                                response.setContentType("APPLICATION/OCTET-STREAM");
                                response.setHeader("Content-Disposition", headStr);
                                OutputStream out = response.getOutputStream();
                                workbook.write(out);
                            }
                            catch (IOException e)
                            {
                                e.printStackTrace();
                            }
                        }
 
                }catch(Exception e){
                        e.printStackTrace();
                }
                
        }
        
        /* 
         * 列头单元格样式
         */    
        public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
                
                  // 设置字体
          HSSFFont font = workbook.createFont();
          //设置字体大小
          font.setFontHeightInPoints((short)11);
          //字体加粗
          font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
          //设置字体名字 
          font.setFontName("Courier New");
          //设置样式; 
          HSSFCellStyle style = workbook.createCellStyle();
          //设置底边框; 
          style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
          //设置底边框颜色;  
          style.setBottomBorderColor(HSSFColor.BLACK.index);
          //设置左边框;   
          style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
          //设置左边框颜色; 
          style.setLeftBorderColor(HSSFColor.BLACK.index);
          //设置右边框; 
          style.setBorderRight(HSSFCellStyle.BORDER_THIN);
          //设置右边框颜色; 
          style.setRightBorderColor(HSSFColor.BLACK.index);
          //设置顶边框; 
          style.setBorderTop(HSSFCellStyle.BORDER_THIN);
          //设置顶边框颜色;  
          style.setTopBorderColor(HSSFColor.BLACK.index);
          //在样式用应用设置的字体;  
          style.setFont(font);
          //设置自动换行; 
          style.setWrapText(false);
          //设置水平对齐的样式为居中对齐;  
          style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
          //设置垂直对齐的样式为居中对齐; 
          style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
          
          return style;
          
        }
        
        /*  
         * 列数据信息单元格样式
         */  
        public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
                  // 设置字体
                  HSSFFont font = workbook.createFont();
                  //设置字体大小
                  //font.setFontHeightInPoints((short)10);
                  //字体加粗
                  //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
                  //设置字体名字 
                  font.setFontName("Courier New");
                  //设置样式; 
                  HSSFCellStyle style = workbook.createCellStyle();
                  //设置底边框; 
                  style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
                  //设置底边框颜色;  
                  style.setBottomBorderColor(HSSFColor.BLACK.index);
                  //设置左边框;   
                  style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
                  //设置左边框颜色; 
                  style.setLeftBorderColor(HSSFColor.BLACK.index);
                  //设置右边框; 
                  style.setBorderRight(HSSFCellStyle.BORDER_THIN);
                  //设置右边框颜色; 
                  style.setRightBorderColor(HSSFColor.BLACK.index);
                  //设置顶边框; 
                  style.setBorderTop(HSSFCellStyle.BORDER_THIN);
                  //设置顶边框颜色;  
                  style.setTopBorderColor(HSSFColor.BLACK.index);
                  //在样式用应用设置的字体;  
                  style.setFont(font);
                  //设置自动换行; 
                  style.setWrapText(false);
                  //设置水平对齐的样式为居中对齐;  
                  style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
                  //设置垂直对齐的样式为居中对齐; 
                  style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                 
                  return style;
        
        }
}
--------------------- 
作者:艾伦蓝 
来源:CSDN 
原文:https://blog.csdn.net/lan12334321234/article/details/70049738 
版权声明:本文为博主原创文章,转载请附上博文链接!