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  • 下载excle文件之工具

    创建万能的工具类,已备用

    ExcelData.java 存放文件数据

    package com.ulic.gis.dataCenter.util;
    import java.io.Serializable;
    
    import java.util.List;
    
     
    
    public class ExcelData implements Serializable {
    
     
    
        private static final long serialVersionUID = 6133772627258154184L;
    
        /**
    
         * 表头
    
         */
    
        private List<String> titles;
    
     
    
        /**
    
         * 数据
    
         */
    
        private List<List<Object>> rows;
    
     
    
        /**
    
         * 页签名称
    
         */
    
        private String name;
    
     
    
        public List<String> getTitles() {
    
            return titles;
    
        }
    
     
    
        public void setTitles(List<String> titles) {
    
            this.titles = titles;
    
        }
    
     
    
        public List<List<Object>> getRows() {
    
            return rows;
    
        }
    
     
    
        public void setRows(List<List<Object>> rows) {
    
            this.rows = rows;
    
        }
    
     
    
        public String getName() {
    
            return name;
    
        }
    
     
    
        public void setName(String name) {
    
            this.name = name;
    
        }
    
    }

    ExcelConstant.java 存放文件路径

    package com.ulic.gis.dataCenter.util;
    
    public class ExcelConstant {
    
         
    
        /**
    
         * 生成文件存放路径
    
         */
    
        public static final String FILE_PATH = "C:\Users\Administrator\Desktop\";
    
     
    
        /**
    
         * 表格默认名称
    
         */
    
        public static final String FILE_NAME = "TEST.xls";
    
    }

    ExcelUtils.java 设置文件

    package com.ulic.gis.dataCenter.util;
    
    
    import java.awt.Color;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.OutputStream;
    import java.net.URLEncoder;
    import java.util.List;
    
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.poi.ss.usermodel.BorderStyle;
    import org.apache.poi.ss.usermodel.Cell;
    import org.apache.poi.ss.usermodel.Font;
    import org.apache.poi.ss.usermodel.IndexedColors;
    import org.apache.poi.ss.usermodel.Row;
    import org.apache.poi.ss.usermodel.Sheet;
    import org.apache.poi.xssf.usermodel.XSSFCellStyle;
    import org.apache.poi.xssf.usermodel.XSSFColor;
    import org.apache.poi.xssf.usermodel.XSSFSheet;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.apache.poi.xssf.usermodel.extensions.XSSFCellBorder.BorderSide;
    
     
    
    public class ExcelUtils {
    
     
    
        /**
    
         * 使用浏览器选择路径下载
    
         * @param response
    
         * @param fileName
    
         * @param data
    
         * @throws Exception
    
         */
    
        public static void exportExcel(HttpServletResponse response, String fileName, ExcelData data) throws Exception {
    
            // 告诉浏览器用什么软件可以打开此文件
    
            response.setHeader("content-Type", "application/vnd.ms-excel");
    
            // 下载文件的默认名称
    
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".xls", "utf-8"));
    
            exportExcel(data, response.getOutputStream());
    
        }
    
     
    
        public static int generateExcel(ExcelData excelData, String path) throws Exception {
    
            File f = new File(path);
    
            FileOutputStream out = new FileOutputStream(f);
    
            return exportExcel(excelData, out);
    
        }
    
     
    
        private static int exportExcel(ExcelData data, OutputStream out) throws Exception {
    
            XSSFWorkbook wb = new XSSFWorkbook();
    
            int rowIndex = 0;
    
            try {
    
                String sheetName = data.getName();
    
                if (null == sheetName) {
    
                    sheetName = "Sheet1";
    
                }
    
                XSSFSheet sheet = wb.createSheet(sheetName);
    
                rowIndex = writeExcel(wb, sheet, data);
    
                wb.write(out);
    
            } catch (Exception e) {
    
                e.printStackTrace();
    
            } finally {
    
                //此处需要关闭 wb 变量
    
                out.close();
    
            }
    
            return rowIndex;
    
        }
    
     
    
        /**
    
         * 表不显示字段
    
         * @param wb
    
         * @param sheet
    
         * @param data
    
         * @return
    
         */
    
    //    private static int writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {
    
    //        int rowIndex = 0;
    
    //        writeTitlesToExcel(wb, sheet, data.getTitles());
    
    //        rowIndex = writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
    
    //        autoSizeColumns(sheet, data.getTitles().size() + 1);
    
    //        return rowIndex;
    
    //    }
    
     
    
        /**
    
         * 表显示字段
    
         * @param wb
    
         * @param sheet
    
         * @param data
    
         * @return
    
         */
    
        private static int writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {
    
            int rowIndex = 0;
    
            rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
    
            rowIndex = writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
    
            autoSizeColumns(sheet, data.getTitles().size() + 1);
    
            return rowIndex;
    
        }
    
        /**
    
         * 设置表头
    
         *
    
         * @param wb
    
         * @param sheet
    
         * @param titles
    
         * @return
    
         */
    
        private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
    
            int rowIndex = 0;
    
            int colIndex = 0;
    
            Font titleFont = wb.createFont();
    
            //设置字体
    
            titleFont.setFontName("simsun");
    
            //设置粗体
    
            titleFont.setBoldweight(Short.MAX_VALUE);
    
            //设置字号
    
            titleFont.setFontHeightInPoints((short) 14);
    
            //设置颜色
    
            titleFont.setColor(IndexedColors.BLACK.index);
    
            XSSFCellStyle titleStyle = wb.createCellStyle();
    
            //水平居中
    
            titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    
            //垂直居中
    
            titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    
            //设置图案颜色
    
            titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
    
            //设置图案样式
    
            titleStyle.setFillPattern(XSSFCellStyle.SOLID_FOREGROUND);
    
            titleStyle.setFont(titleFont);
    
            setBorder(titleStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
    
            Row titleRow = sheet.createRow(rowIndex);
    
            titleRow.setHeightInPoints(25);
    
            colIndex = 0;
    
            for (String field : titles) {
    
                Cell cell = titleRow.createCell(colIndex);
    
                cell.setCellValue(field);
    
                cell.setCellStyle(titleStyle);
    
                colIndex++;
    
            }
    
            rowIndex++;
    
            return rowIndex;
    
        }
    
     
    
        /**
    
         * 设置内容
    
         *
    
         * @param wb
    
         * @param sheet
    
         * @param rows
    
         * @param rowIndex
    
         * @return
    
         */
    
        private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
    
            int colIndex;
    
            Font dataFont = wb.createFont();
    
            dataFont.setFontName("simsun");
    
            dataFont.setFontHeightInPoints((short) 14);
    
            dataFont.setColor(IndexedColors.BLACK.index);
    
     
    
            XSSFCellStyle dataStyle = wb.createCellStyle();
    
            dataStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
    
            dataStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
    
            dataStyle.setFont(dataFont);
    
            setBorder(dataStyle, BorderStyle.THIN, new XSSFColor(new Color(0, 0, 0)));
    
            for (List<Object> rowData : rows) {
    
                Row dataRow = sheet.createRow(rowIndex);
    
                dataRow.setHeightInPoints(25);
    
                colIndex = 0;
    
                for (Object cellData : rowData) {
    
                    Cell cell = dataRow.createCell(colIndex);
    
                    if (cellData != null) {
    
                        cell.setCellValue(cellData.toString());
    
                    } else {
    
                        cell.setCellValue("");
    
                    }
    
                    cell.setCellStyle(dataStyle);
    
                    colIndex++;
    
                }
    
                rowIndex++;
    
            }
    
            return rowIndex;
    
        }
    
     
    
        /**
    
         * 自动调整列宽
    
         *
    
         * @param sheet
    
         * @param columnNumber
    
         */
    
        private static void autoSizeColumns(Sheet sheet, int columnNumber) {
    
            for (int i = 0; i < columnNumber; i++) {
    
                int orgWidth = sheet.getColumnWidth(i);
    
                sheet.autoSizeColumn(i, true);
    
                int newWidth = (int) (sheet.getColumnWidth(i) + 100);
    
                if (newWidth > orgWidth) {
    
                    sheet.setColumnWidth(i, newWidth);
    
                } else {
    
                    sheet.setColumnWidth(i, orgWidth);
    
                }
    
            }
    
        }
    
     
    
        /**
    
         * 设置边框
    
         *
    
         * @param style
    
         * @param border
    
         * @param color
    
         */
    
        private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
    
            style.setBorderTop(border);
    
            style.setBorderLeft(border);
    
            style.setBorderRight(border);
    
            style.setBorderBottom(border);
    
            style.setBorderColor(BorderSide.TOP, color);
    
            style.setBorderColor(BorderSide.LEFT, color);
    
            style.setBorderColor(BorderSide.RIGHT, color);
    
            style.setBorderColor(BorderSide.BOTTOM, color);
    
        }
    
    }

    工具到此创建完毕,开始使用

    栗子:

    public void downloadFile(){
        List<PerformanceStatisticsVo> list = dataCenterService.performanceStatistics(conditionVo);
            ExcelData data = new ExcelData();
            data.setName("业绩统计");
            List<String> titles = new ArrayList();
            titles.add("姓名");
            titles.add("产品名");
            titles.add("购买数量");
            titles.add("保费");
            data.setTitles(titles);
            List<List<Object>> rows = new ArrayList();
            for(int i = 0, length = list.size();i<length;i++){
                PerformanceStatisticsVo performanceStatisticsVo = list.get(i);
                List<Object> row = new ArrayList();
                row.add(performanceStatisticsVo.getName());
                row.add(performanceStatisticsVo.getProductName());
                row.add(performanceStatisticsVo.getPolicyNum());
                row.add(performanceStatisticsVo.getPolicyPrem());
                rows.add(row);
            }
            data.setRows(rows);
            try{
                ExcelUtils.exportExcel(response,"业绩统计",data);
            }catch (Exception e){
                e.printStackTrace();
            }
    
    }
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  • 原文地址:https://www.cnblogs.com/yinyl/p/11014840.html
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