poi 导出excel

Posted 2021-02-07 joyny

直接上代码

1 pom.xml引入依赖

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>RELEASE</version>
        </dependency>        

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2 编写导出实体类

package com.joyny.ecas.entity;

import java.io.Serializable;
import java.util.List;

public class ExcelData implements Serializable {

    private static final long serialVersionUID = 4444017239100620999L;

    // 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;
    }

}

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3 导出核心

package com.joyny.ecas.utils;

import com.joyny.ecas.entity.ExcelData;
import org.apache.poi.ss.usermodel.*;
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;

import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.List;

public class ExportExcelUtils {
    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, "utf-8"));
        exportExcel(data, response.getOutputStream());
    }

    public static void exportExcel(ExcelData data, OutputStream out) throws Exception {

        XSSFWorkbook wb = new XSSFWorkbook();
        try {
            String sheetName = data.getName();
            if (null == sheetName) {
                sheetName = "Sheet1";
            }
            XSSFSheet sheet = wb.createSheet(sheetName);
            writeExcel(wb, sheet, data);

            wb.write(out);
        } finally {
            wb.close();
        }
    }

    private static void writeExcel(XSSFWorkbook wb, Sheet sheet, ExcelData data) {

        int rowIndex = 0;

        rowIndex = writeTitlesToExcel(wb, sheet, data.getTitles());
        writeRowsToExcel(wb, sheet, data.getRows(), rowIndex);
        autoSizeColumns(sheet, data.getTitles().size() + 1);

    }

    private static int writeTitlesToExcel(XSSFWorkbook wb, Sheet sheet, List<String> titles) {
        int rowIndex = 0;
        int colIndex = 0;

        Font titleFont = wb.createFont();
        titleFont.setFontName("simsun");
        titleFont.setBold(true);
        // titleFont.setFontHeightInPoints((short) 14);
        titleFont.setColor( IndexedColors.BLACK.index);

        XSSFCellStyle titleStyle = wb.createCellStyle();
//        titleStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
//        titleStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
//        titleStyle.setFillForegroundColor(new XSSFColor(new Color(182, 184, 192)));
//        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;
    }

    private static int writeRowsToExcel(XSSFWorkbook wb, Sheet sheet, List<List<Object>> rows, int rowIndex) {
        int colIndex = 0;

        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;
    }

    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);
            }
        }
    }

    private static void setBorder(XSSFCellStyle style, BorderStyle border, XSSFColor color) {
        style.setBorderTop(border);
        style.setBorderLeft(border);
        style.setBorderRight(border);
        style.setBorderBottom(border);
        style.setBorderColor( XSSFCellBorder.BorderSide.TOP, color);
        style.setBorderColor( XSSFCellBorder.BorderSide.LEFT, color);
        style.setBorderColor( XSSFCellBorder.BorderSide.RIGHT, color);
        style.setBorderColor( XSSFCellBorder.BorderSide.BOTTOM, color);
    }
}

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4 测试

@RequestMapping(value = "/excel", method = RequestMethod.GET)
    public void excel(HttpServletResponse response) throws Exception {
        ExcelData data = new ExcelData();
        data.setName("hello");
        List<String> titles = new ArrayList();
        titles.add("aa");
        titles.add("bb(en)");
        titles.add("cc");



        data.setTitles(titles);

        List<List<Object>> rows = new ArrayList();
        List<Object> row = new ArrayList();
        row.add("11111111111");
        row.add("22222222222");
        row.add("3333333333");
        rows.add(row);

        data.setRows(rows);
        //生成本地
        /*File f = new File("c:/test.xlsx");
        FileOutputStream out = new FileOutputStream(f);
        ExportExcelUtils.exportExcel(data, out);
        out.close();*/
        ExportExcelUtils.exportExcel(response,"history.xlsx",data);
    }

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