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();
        }

}