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poi excel导出

作者:互联网

先引入依赖

<!--       poi引用 -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.1</version>
        </dependency>

工具类:

    private static ExcelUtils excelUtils;

    public ExcelUtils() {
    }

    public static ExcelUtils ExcelUtils() {
        if (excelUtils== null) {
            excelUtils= new ExcelUtils();
        }
        return excelUtils;
    }


    /**
     * 动态赋值单元格样式
     */
    Map<String, HSSFCellStyle> Style = new HashMap<>();
    /**
     * 动态赋值字体样式
     */
    Map<String, Font> fontMap = new HashMap<>();

    /**
     * 导出
     *
     * @param list    导出的数据
     * @param headers 导出的表头
     * @param name    文件名称
     * @throws IOException
     */
    public void export(List<Map> list, String[] headers, String name) throws IOException {
        Excel transToExcel = new Excel();
        try {
            //这个东西表示获取根目录
            String path = System.getProperty("user.dir");
            OutputStream os = new FileOutputStream(path + "/" + name + ".xls");
            transToExcel.exporteExcel(name, headers, list, os);
            os.close();
        } catch (FileNotFoundException e) {
            System.out.println("无法找到文件");
        } catch (IOException e) {
            System.out.println("写入文件失败");
        }
    }

    /**
     * 导出excel文件
     *
     * @param title    表sheet的名字
     * @param headers  表头
     * @param dataList 正文单元格
     * @param out      输出流
     */
    public void exporteExcel(String title, String[] headers, List<Map> dataList, OutputStream out) {
        HSSFWorkbook workBook = new HSSFWorkbook();
        createSheet(title, headers, dataList, workBook);
        //这里可多次调用生成工作簿
//        createSheet(title + "2", headers, dataList, workBook);
        try {
            workBook.write(out);
        } catch (IOException e) {
            System.out.println("写入文件失败" + e.getMessage());
        }
    }


    /**
     * 创建sheet
     *
     * @param title    sheet的名字
     * @param headers  表头
     * @param dataList 正文单元格
     */
    private void createSheet(String title, String[] headers, List<Map> dataList, HSSFWorkbook workBook) {

        HSSFSheet sheet = workBook.createSheet(title);
        sheet.setDefaultColumnWidth(15);
        //设置表头和普通单元格的格式
        HSSFCellStyle headStyle = setHeaderStyle(workBook);
        HSSFCellStyle bodyStyle = setBodyStyle(workBook);

        createHeader(headers, sheet, headStyle);
        createBody(dataList, sheet, bodyStyle, headers);

    }

    /**
     * 创建正文单元格
     *
     * @param dataList  数据数组
     * @param sheet     表
     * @param bodyStyle 单元格格式
     * @param headers   表头
     */
    private void createBody(List<Map> dataList, HSSFSheet sheet, HSSFCellStyle bodyStyle, String[] headers) {
        //可以设置动态赋值颜色 setBodyStyleMov();
        //当前行
        int sheetRow = 1;
        for (int a = 0; a < dataList.size(); a++) {
            Map map = dataList.get(a);
            HSSFRow row = sheet.createRow(sheetRow);
            for (int j = 0; j < headers.length; j++) {
                HSSFCell cell = row.createCell(j);
                HSSFRichTextString textString = null;
                String val=null;
                if (map.get(headers[j]) != null) {
                   val = map.get(headers[j]).toString();
                    textString= new HSSFRichTextString(val);
                    // 这里可以给单个字体赋值颜色 textString.applyFont(fontMap.get("1"));
                    // 这里可以给单个单元格赋值不同颜色 cell.setCellStyle(style.get("1"));
                    //给单元格赋值颜色和值
                    cell.setCellStyle(bodyStyle);
                    cell.setCellValue(textString);
                } else {
                    cell.setCellValue(textString);
                }


            }
            sheetRow++;
        }
    }

    /**
     * 传入字符返回字母
     * @param a
     * @return
     */
    public static String getLetter(String a) {
        StringBuffer sb = new StringBuffer();
        for(int i = 0;i<a.length();i++){
            char c = a.charAt(i);
            if((c<='z'&&c>='a')||(c<='Z'&&c>='A')){
                if (sb.length()>0){
                    sb.append(",");
                }
                sb.append(c);
            }
        }
        System.out.println(sb.toString());
        return sb.toString();
    }
    /**
     * 创建表头
     *
     * @param headers   表头
     * @param sheet     表
     * @param headStyle 表头格式
     */
    private void createHeader(String[] headers, HSSFSheet sheet, HSSFCellStyle headStyle) {
        HSSFRow row = sheet.createRow(0);
        for (int i = 0; i < headers.length; i++) {
            HSSFCell cell = row.createCell(i);
            cell.setCellStyle(headStyle);
            HSSFRichTextString textString = new HSSFRichTextString(headers[i]);
            cell.setCellValue(textString);
            //只能解决英文、数字列宽自适应,如果该列为中文,会出现列宽不足现象。
            sheet.autoSizeColumn((short) i);
            // 解决自动设置列宽中文失效的问题
            // sheet.setColumnWidth(i, sheet.getColumnWidth(i) * 17 / 10);


        }
    }


    /**
     * 设置正文单元格格式动态
     *
     * @param workBook
     * @return
     */
    private void setBodyStyleMov(HSSFWorkbook workBook) {
        //拿到palette颜色板
        HSSFPalette palette = workBook.getCustomPalette();
        //自定义颜色 黄 这里是吧 IndexedColors.YELLOW.getIndex() 替换成 rgb(255,255,0)
        palette.setColorAtIndex(IndexedColors.YELLOW.getIndex(), (byte) 255, (byte) 255, (byte) 0);
        //黄色 吧颜色赋值好存到map之后可以调用
        HSSFCellStyle style = workBook.createCellStyle();
        style.setFillForegroundColor(palette.getColor(IndexedColors.YELLOW.getIndex()).getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        Style.put("1", style);

        //这里同理替换颜色
        palette.setColorAtIndex(IndexedColors.GOLD.getIndex(), (byte) 90, (byte) 140, (byte) 55);
        Font font = workBook.createFont();
        font.setBold(true);
        font.setColor(palette.getColor(IndexedColors.GOLD.getIndex()).getIndex());
        fontMap.put("1", font);

    }

    /**
     * 设置正文单元格格式
     *
     * @param workBook
     * @return
     */
    private HSSFCellStyle setBodyStyle(HSSFWorkbook workBook) {
        HSSFCellStyle style = workBook.createCellStyle();
        //设置背景颜色
        style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        //边框颜色和宽度设置
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex()); // 下边框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex()); // 左边框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.BLACK.getIndex()); // 右边框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.BLACK.getIndex()); // 上边框
        //对齐方式设置
        style.setAlignment(HorizontalAlignment.CENTER);
//        粗体字设置
        Font font = workBook.createFont();
        font.setFontName("微软雅黑");
        style.setFont(font);
        return style;
    }

    /**
     * 设置表头格式
     *
     * @param workBook
     * @return
     */
    private HSSFCellStyle setHeaderStyle(HSSFWorkbook workBook) {
        HSSFCellStyle style = workBook.createCellStyle();
        //设置背景颜色
        style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
//        边框颜色和宽度设置
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex()); // 下边框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex()); // 左边框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.BLACK.getIndex()); // 右边框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.BLACK.getIndex()); // 上边框
//        对齐方式设置
        style.setAlignment(HorizontalAlignment.CENTER);
//        粗体字设置
        Font font = workBook.createFont();
        font.setBold(true);
        font.setFontName("微软雅黑");
        style.setFont(font);
        return style;
    }


标签:getIndex,style,sheet,excel,导出,param,headers,poi,workBook
来源: https://blog.csdn.net/qq_42051115/article/details/110233896