java 實現excel生成

0 概述

在實際工作我們希望能夠下載到相應數據表格，比如Excel形式，本文主要實現Excel 表格生成&下載。

1 依賴pom

     <!-- ooxml -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.6</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.6</version>
        </dependency>

2 代碼實現

ExcelUtils 生成的工具類：

import com.google.common.collect.Lists;
import org.apache.poi.hssf.util.HSSFColor;

import java.util.List;
import java.util.Map;

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.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by hsc
 */
public class ExcelUtils {

    private static final Logger logger = LoggerFactory.getLogger(ExcelUtils.class);

    public static HSSFWorkbook generateExcel(List<Map<String, Object>> data, List<String>
            header) {
        HSSFWorkbook book = new HSSFWorkbook();
        try {

            HSSFSheet sheet = book.createSheet("Sheet1");
            HSSFCellStyle style = book.createCellStyle();
            HSSFFont font = book.createFont();
            setFont(font);
            setStyle(style, font);
            //填充表頭header
            HSSFRow row = sheet.createRow(0);
            for (int i = 0; i < header.size(); i++) {
                String key = header.get(i);
                HSSFCell cell = row.createCell(i);
                cell.setCellValue(key);
            }

            //填充表格內容
            for (int i = 0; i < data.size(); i++) {
                HSSFRow row2 = sheet.createRow(i + 1);//index：第幾行
                Map<String, Object> inner = data.get(i);
                List<Object> value = Lists.newArrayList(inner.values());
                for (int j = 0; j < value.size(); j++) {
                    Object val = value.get(j);
                    HSSFCell cell = row2.createCell(j);//第幾列：從0開始
                    cell.setCellValue(val.toString());
                }
            }
        } catch (Exception ex) {
            logger.error("generateExcel exception", ex);
        }
        return book;
    }

    private static void setStyle(HSSFCellStyle style, HSSFFont font) {
        //樣式設置

        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        style.setFont(font);
    }

    private static void setFont(HSSFFont font) {

        font.setColor(HSSFColor.VIOLET.index);
        font.setFontHeightInPoints((short) 12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);

    }
}

3 測試

測試Demo

    @RequestMapping("/excel")
    @ResponseBody
    public void excel(@RequestParam(value = "id") Long id,HttpServletResponse httpServletResponse) {
        List<String> header = Lists.newArrayList();
        header.add("學號");
        header.add("姓名");
        Map<String,Object> map=new HashMap<>();
        map.put("id",id);
        map.put("name","小紅");
        HSSFWorkbook hssfWorkbook = ExcelUtils.generateExcel(Lists.newArrayList(map),header);
        if (null != hssfWorkbook) {
            try {
                httpServletResponse.setHeader("Content-Disposition", "attachment; filename=appointmentUser.xls");
                httpServletResponse.setContentType("application/vnd.ms-excel; charset=utf-8");
                OutputStream out = httpServletResponse.getOutputStream();
                hssfWorkbook.write(out);
                out.flush();
                out.close();
            } catch (Exception ex) {
                logger.error("關閉 hssfWorkbook 異常", ex);
            }
        }

啓動服務：
http://127.0.0.1:8080/excel?id=1212