POI报表工具类

Bertha 。 2022-05-14 06:48 254阅读 0赞

工具类：

package cn.oa.utils;
    
    import org.apache.poi.hssf.usermodel.*;
    import org.apache.poi.hssf.util.HSSFColor;
    import org.apache.poi.ss.util.CellRangeAddress;
    import javax.servlet.http.HttpServletResponse;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.ArrayList;
    import java.util.List;
    
    public class CommonExcelUtils {
    
    	/**
    	 * 显示的导出表的标题
    	 * */
        private String title;
        /**
    	 * 导出表的列名
    	 * */
        private String[] colName;
        /**
    	 * 导出的文件名
    	 * */
        private String fileName;
    
        private List<Object[]> dataList = new ArrayList<Object[]>();
    
        private HttpServletResponse response;
    
        /**
         * @param 构造方法，传入要导出的数据
         * @param colName
         * @param dataList
         * @param response
         * @param fileName
         */
        public CommonExcelUtils(String title, String[] colName, List<Object[]> dataList, HttpServletResponse response, String fileName) {
            this.dataList = dataList;
            this.colName = colName;
            this.title = title;
            this.response = response;
            this.fileName = fileName;
        }
    
        /**  
        * @Description 导出列表 
        * @date 2018年8月22日下午4:37:05
        */  
        public void downloadExcel() throws Exception {
            try {
            	// 创建工作簿对象
                HSSFWorkbook workbook = new HSSFWorkbook();   
                // 创建工作表
                HSSFSheet sheet = workbook.createSheet(title);                 
                // 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】
                //获取列头样式对象(就是列名)
                HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);
                //单元格样式对象
                HSSFCellStyle style = this.getStyle(workbook);                  
                //合并单元格 为标题
                sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (colName.length - 1)));
                cellTiltle.setCellStyle(columnTopStyle);
                cellTiltle.setCellValue(title);
                // 定义所需列数
                int columnNum = colName.length;
                HSSFRow rowRowName = sheet.createRow(2);                
                // 将列头设置到sheet的单元格中
                for (int n = 0; n < columnNum; n++) {
                	//创建列头对应个数的单元格
                    HSSFCell cellRowName = rowRowName.createCell(n);
                    //设置列头单元格的数据类型
                    cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);            
                    HSSFRichTextString text = new HSSFRichTextString(colName[n]);
                    //设置列头单元格的值
                    cellRowName.setCellValue(text);
                    //设置列头单元格样式
                    cellRowName.setCellStyle(columnTopStyle);                       
                }
                //将查询出的数据设置到sheet对应的单元格中
                //创建所需的行数 前面已经占了三行所以+3
                for (int i = 0; i < dataList.size(); i++) {
                    Object[] obj = dataList.get(i);
                    HSSFRow row = sheet.createRow(i + 3);
                    for (int j = 0; j < obj.length; j++) {
                        HSSFCell cell = null;   
                        	//设置单元格的数据类型
                            cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                            if (obj[j] != null) {
                                cell.setCellValue(obj[j].toString());                
                            }
                        cell.setCellStyle(style);                                   
                    }
                }
                //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;
                                }
                            }
                        }
                    }
                    //限制列最大宽度
                    if(columnWidth > 50) {   
                    	columnWidth = 50;
                    }
                    if (colNum == 0) {
                        sheet.setColumnWidth(colNum, (columnWidth + 2) * 256);
                    } else {
                        sheet.setColumnWidth(colNum, (columnWidth + 2) * 256);
                    }
                }
                if (workbook != null) {
                    try {
                        if (response != null) {
                            response.setContentType("application/vnd.ms-excel;charset=utf-8");
                            response.setHeader("Content-Disposition", "attachment;filename="+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
                            OutputStream out = response.getOutputStream();
                            workbook.write(out);
                            out.close();
                        } else {
                            FileOutputStream outputStream = new FileOutputStream("D:/"+fileName);
                            workbook.write(outputStream);
                            outputStream.close();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        /**  
        * @author zhangliang
        * @Description  列头单元格样式即列名的样式
        * @date 2018年8月24日上午11:37:23
        */  
        public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {
    
            // 设置字体
            HSSFFont font = workbook.createFont();
            //设置字体大小
            font.setFontHeightInPoints((short) 13);
            //字体加粗
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            //设置字体名字
            font.setFontName("微软雅黑");
            //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;
    
        }
        /**  
        * @Description 列数据信息单元格样式
        * @date 2018年8月24日上午11:36:45
        */  
        public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
            // 设置字体
            HSSFFont font = workbook.createFont();
            //设置字体名字
            font.setFontName("微软雅黑");
            //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;
        }
    }

使用demo：（网站项目传参response，会在浏览器下载，javase项目不需要response，直接保存在本地）

public static void main(String[] args) throws Exception {
        	String[]arr=new String[] {"第一行","第二行","第三行"};
        	String[]arr2=new String[] {"1,1","1,2","1,3"};
        	String[]arr3=new String[] {"2,1","2,2","2,3"};
        	String[]arr4=new String[] {"3,1","3,2","3,3"};
        	List<Object[]>list=new ArrayList<>();
        	list.add(arr2);
        	list.add(arr3);
        	list.add(arr4);
    		ExcelUtils excelUtils=new ExcelUtils("测试", arr, list, null, "测试.xls");
    		excelUtils.downloadExcel();
    	}

结果图：

![70][]

[70]: /images/20220514/cdd37a203d5e4a138a7bfd43e18934d2.png