POI Excel 工具類

簡述

1. 生成爲.xlsx後綴
2. 基本格式爲 標題 + 字段 + 內容 + 備註
3. 能夠指定建立下拉框
4. 流式風格API，易於理解使用
5. 樣式可擴展

最終效果

測試類

import net.sf.json.JSONArray;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Created by gy on 2017/9/7.
 */
public class ExcelUtils2007Test {


    public static void main(String[] args) throws IOException {


        ExcelUtils2007 builder = new ExcelUtils2007();

        JSONArray content = JSONArray.fromObject("[[\"a\",\"b\",\"c\"],[\"aa\",\"bb\",\"cc\"],[\"aaa\",\"bbb\",\"ccc\"]]");
        JSONArray data = JSONArray.fromObject("[{\"text\":\"高\",\"value\":\"H\"},{\"text\":\"中\",\"value\":\"M\"},{\"text\":\"低\",\"value\":\"L\"}]");

        builder.createSheet("sheetName")
                .setTitle("title")
                .setStyle(ExcelUtils2007.STYLE_TITLE)
                .setField(new String[]{"A", "B", "C"})
                .setStyle(ExcelUtils2007.STYLE_FIELD)
                .setContent(content)
                .setStyle(ExcelUtils2007.STYLE_CONTENT)
                .setRemark("remark")
                .setStyle(ExcelUtils2007.REMARK_CONTENT)
                .build();

        // 設置下拉框
        builder.setDropDownBox(data, 2, 2, 4, 4);

        XSSFWorkbook workbook = builder.getWorkbook();

        OutputStream outputStream = new FileOutputStream("E:\\2.xlsx");
        workbook.write(outputStream);
        outputStream.flush();


    }

}

工具類

import net.sf.json.JSONArray;
import org.apache.commons.collections.map.LinkedMap;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.usermodel.*;
import org.network.framework.exception.BusinessException;

import java.util.ArrayList;
import java.util.UUID;

/**
 * Created by gy on 2017/9/7.
 */
public class ExcelUtils2007 {

    private XSSFWorkbook workbook = new XSSFWorkbook();
    private XSSFSheet sheet;
    private LinkedMap cellStyleMap = new LinkedMap();
    private ArrayList<CellRangeAddress> mergeRegionList = new ArrayList();

    private static int TITLE_ROW_NUM = 0;
    private static int FIELD_ROW_NUM = 1;
    private static int CONTENT_START_ROW_NUM = 2;

    public static String STYLE_TITLE = StyleEnum.STYLE_TITLE.toString();
    public static String STYLE_FIELD = StyleEnum.STYLE_FIELD.toString();
    public static String STYLE_CONTENT = StyleEnum.STYLE_CONTENT.toString();
    public static String REMARK_CONTENT = StyleEnum.REMARK_CONTENT.toString();

    /*************************************** main start *********************************************************/
    public ExcelUtils2007 createSheet(String sheetName) {
        if (this.workbook == null)
            throw new BusinessException("請指定工做簿！");
        this.sheet = createSheet(workbook, sheetName);
        this.sheet.setDefaultColumnWidth(15);
        return this;
    }
    public static XSSFSheet createSheet(XSSFWorkbook workbook, String sheetName) {
        return workbook.createSheet(sheetName);
    }

    public ExcelUtils2007 setTitle(String title) {
        CellRangeAddress address = setTitle(this.sheet, title);
        cellStyleMap.put(address, null);
        return this;
    }
    public static CellRangeAddress setTitle(XSSFSheet sheet, String title) {

        Row row = sheet.createRow(TITLE_ROW_NUM);
        final Cell cell = row.createCell(0);
        cell.setCellValue(title);

        CellRangeAddress address = new CellRangeAddress(TITLE_ROW_NUM, TITLE_ROW_NUM , 0, 0);

        return address;

    }

    public ExcelUtils2007 setField(String[] fields) {
        CellRangeAddress cells = setField(this.sheet, fields);
        cellStyleMap.put(cells, null);
        mergeRegionList.add(new CellRangeAddress(0, 0, 0, fields.length));
        return this;
    }
    public static CellRangeAddress setField(XSSFSheet sheet, String[] fields) {

        Row row = sheet.createRow(FIELD_ROW_NUM);

        // 第一個字段爲序號
        row.createCell(0).setCellValue("序號");

        int i = 1;
        for (String field : fields)
            row.createCell(i++).setCellValue(field);

        return new CellRangeAddress(FIELD_ROW_NUM, FIELD_ROW_NUM, 0, fields.length);
    }

    public ExcelUtils2007 setContent(JSONArray content) {
        CellRangeAddress address = setContent(this.sheet, content);
        if (address != null)
            cellStyleMap.put(address, null);
        return this;
    }
    public static CellRangeAddress setContent(XSSFSheet sheet, JSONArray content) {
        if (content == null || content.size() == 0)
            return null;

        for (int i = 0; i < content.size(); i++) {
            XSSFRow row = sheet.createRow(CONTENT_START_ROW_NUM + i);
            JSONArray bees = content.optJSONArray(i);

            Cell firstCol = row.createCell(0);// 序號
            firstCol.setCellValue(i + 1);
            for (int j = 0; j < bees.size(); j++)
                row.createCell(j + 1).setCellValue(bees.optString(j));
        }

        return new CellRangeAddress(CONTENT_START_ROW_NUM,
                CONTENT_START_ROW_NUM + content.size() - 1,
                0,
                content.optJSONArray(0).size());
    }

    public ExcelUtils2007 setRemark(String remark) {
        CellRangeAddress address = setRemark(this.sheet, remark);
        cellStyleMap.put(address, null);

        int fieldNum = sheet.getRow(1).getPhysicalNumberOfCells();
        CellRangeAddress address1 = address.copy();
        address1.setLastColumn(fieldNum - 1);
        mergeRegionList.add(address1);
        return this;
    }

    public static CellRangeAddress setRemark(XSSFSheet sheet, String remark) {

        int firstRow = sheet.getLastRowNum() + 1;
        int lastRow = sheet.getLastRowNum() + 1;
        int firstCol = 0;

        sheet.createRow(firstRow).createCell(firstCol).setCellValue(remark);

        return new CellRangeAddress(firstRow, lastRow, firstCol, firstCol);
    }

    public ExcelUtils2007 setStyle(String styleName) {

        StyleEnum styleEnum = StyleEnum.valueOf(styleName);
        String fontName = styleEnum.getFontName();
        short fontSize = styleEnum.getFontSize();
        short fillColor = styleEnum.getFillColor();
        short align = styleEnum.getAlign();

        XSSFCellStyle style = this.workbook.createCellStyle();

        // 字體
        XSSFFont font = workbook.createFont();
        font.setFontHeight(fontSize);
        font.setFontName(fontName);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        font.setColor(HSSFFont.COLOR_NORMAL);
        style.setFont(font);

        // 填充色
        style.setFillForegroundColor(fillColor);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

        // 邊框
        style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
        style.setBorderRight(XSSFCellStyle.BORDER_THIN);
        style.setBorderTop(XSSFCellStyle.BORDER_THIN);

        // 對齊方式
        style.setAlignment(align);


        cellStyleMap.put(cellStyleMap.lastKey(), style);
        return this;
    }

    /**
     * @param list [{text:'', value:''}]
     */
    public ExcelUtils2007 setDropDownBox(JSONArray list, int firstRow, int lastRow, int firstCol, int lastCol) {
        setDropDownBox(this.workbook, this.sheet, list, firstRow, lastRow, firstCol, lastCol);
        return this;
    }

    public static void setDropDownBox(XSSFWorkbook workbook, XSSFSheet sheet, JSONArray list, int firstRow, int lastRow, int firstCol, int lastCol) {
        XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);

        // 建立一個隱藏域
        int num = workbook.getNumberOfSheets();
        String hiddenSheetStr = "hiddenSheet" + num;
        XSSFSheet sheet_hidden = workbook.createSheet(hiddenSheetStr);
        workbook.setSheetHidden(num, true);
        for (int i = 0; i < list.size(); i++) {
            Row row = sheet_hidden.createRow(i);
            String text = list.optJSONObject(i).optString("text");
            String value = list.optJSONObject(i).optString("value");
            row.createCell(0).setCellValue(text);
            row.createCell(1).setCellValue(value);
        }

        // 而後用公式去引用
        String formula = hiddenSheetStr + "!$A$1:$A$" + list.size();

        // 做用區域
        CellRangeAddressList region = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);

        XSSFDataValidationConstraint constraint = (XSSFDataValidationConstraint) dvHelper.createFormulaListConstraint(formula);
        XSSFDataValidation validation = (XSSFDataValidation)dvHelper.createValidation(constraint, region);
        validation.setShowErrorBox(true);

        sheet.addValidationData(validation);
    }

    private void format() {
        for (int i = 0; i < cellStyleMap.size(); i++) {
            CellRangeAddress address = (CellRangeAddress) cellStyleMap.get(i);
            XSSFCellStyle style = (XSSFCellStyle) cellStyleMap.getValue(i);

            int firstRow = address.getFirstRow();
            int lastRow = address.getLastRow();
            int firstColumn = address.getFirstColumn();
            int lastColumn = address.getLastColumn();

            for (int x = firstRow; x <= lastRow; x++) {
                Row row = this.sheet.getRow(x);
                for (int y = firstColumn; y <= lastColumn; y++)
                    row.getCell(y).setCellStyle(style);
            }
        }
    }

    private void merge() {
        for (CellRangeAddress address : mergeRegionList)
            this.sheet.addMergedRegion(address);
    }

    public void build() {
        merge();
        format();
    }

    public XSSFWorkbook getWorkbook() {
        return this.workbook;
    }
    /*************************************** main end *********************************************************/

    /*************************************** enum start *********************************************************/
    private enum StyleEnum {
        STYLE_TITLE("黑體", (short) (16*20), HSSFColor.GREY_25_PERCENT.index, HSSFCellStyle.ALIGN_CENTER),
        STYLE_FIELD("宋體", (short) (12*20), HSSFColor.WHITE.index, HSSFCellStyle.ALIGN_CENTER),
        STYLE_CONTENT("宋體", (short) (12*20), HSSFColor.WHITE.index, HSSFCellStyle.ALIGN_CENTER),
        REMARK_CONTENT("宋體", (short) (12*20), HSSFColor.LIGHT_YELLOW.index, HSSFCellStyle.ALIGN_CENTER);

        private String fontName;
        private short fontSize;
        private short fillColor;
        private short align;

        StyleEnum(String fontName, short fontSize, short fillColor, short align) {
            this.fontName = fontName;
            this.fontSize = fontSize;
            this.fillColor = fillColor;
            this.align = align;
        }

        public String getFontName() {
            return fontName;
        }

        public short getFontSize() {
            return fontSize;
        }

        public short getFillColor() {
            return fillColor;
        }

        public short getAlign() {
            return align;
        }
    }
    /*************************************** enum end *********************************************************/

}