JAVA导出Excel封装

1、数据bean

public class ExcelBean {

    private String name;

    private String sheetName;

    private ExcelTitle[] titles;

    private List<String[]> dataList;

    private boolean headBold = true;

    /**
     * 列宽 （像素）
     */
    private int columnWidth = 200;

    private int rowHeight;

    public ExcelBean(String name, String sheetName, ExcelTitle[] titles){
        this.name = name;
        this.sheetName = sheetName;
        this.titles = titles;
        this.dataList = new ArrayList<String[]>();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSheetName() {
        return sheetName;
    }

    public void setSheetName(String sheetName) {
        this.sheetName = sheetName;
    }

    public ExcelTitle[] getTitles() {
        return titles;
    }

    public void setTitles(ExcelTitle[] titles) {
        this.titles = titles;
    }

    public List<String[]> getDataList() {
        return dataList;
    }

    public void setDataList(List<String[]> dataList) {
        this.dataList = dataList;
    }

    public boolean isHeadBold() {
        return headBold;
    }

    public void setHeadBold(boolean headBold) {
        this.headBold = headBold;
    }

    public int getColumnWidth() {
        return columnWidth;
    }

    public void setColumnWidth(int columnWidth) {
        this.columnWidth = columnWidth;
    }

    public int getRowHeight() {
        return rowHeight;
    }

    public void setRowHeight(int rowHeight) {
        this.rowHeight = rowHeight;
    }

    public void add(String[] data){
        this.dataList.add(data);
    }

}

/**
 * excel 块状区域
 * @author yanglizhe
 *
 */
public class ExcelBox {
    private int x1;

    private int y1;

    private int x2;

    private int y2;

    public ExcelBox(int width, int height, int colWidth, int rowHeight, int padding){
        double ratio = 1;
        int innerWidth = colWidth - 2 * padding;
        int innerHeight = rowHeight - 2 * padding;
        if((double) width / height > (double) innerWidth/ innerHeight){
            if(width > innerWidth){
                ratio = (double) innerWidth / width;
            }
        }
        else{
            if(height > innerHeight){
                ratio = (double) innerHeight / height;
            }
        }

        int boxWidth = (int)(width * ratio);
        int boxHeight = (int)(height * ratio);
        x1 = (colWidth - boxWidth) / 2;
        y1 = (rowHeight - boxHeight) / 2;
        x2 = x1 + boxWidth;
        y2 = y1+ boxHeight;
    }

    public int getX1() {
        return x1;
    }

    public void setX1(int x1) {
        this.x1 = x1;
    }

    public int getY1() {
        return y1;
    }

    public void setY1(int y1) {
        this.y1 = y1;
    }

    public int getX2() {
        return x2;
    }

    public void setX2(int x2) {
        this.x2 = x2;
    }

    public int getY2() {
        return y2;
    }

    public void setY2(int y2) {
        this.y2 = y2;
    }
}

/**
 * excel 图片
 * @author yanglizhe
 *
 */
public class ExcelImage {
    private int width;

    private int height;

    private byte[] byteArray;

    public ExcelImage(String imageUrl) throws IOException{
        BufferedImage bufferedImage = ImageIO.read(new URL(imageUrl));
        ByteArrayOutputStream byteArrayOutputStream =new ByteArrayOutputStream();
        ImageIO.write(bufferedImage,"png", byteArrayOutputStream);
        width = bufferedImage.getWidth();
        height = bufferedImage.getHeight();
        byteArray = byteArrayOutputStream.toByteArray();
        byteArrayOutputStream.close();
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public byte[] getByteArray() {
        return byteArray;
    }

    public void setByteArray(byte[] byteArray) {
        this.byteArray = byteArray;
    }
}

/**
 * Excel Title
 * @author yanglizhe
 *
 */
public class ExcelTitle {

    private String value;

    /**
     * 列宽（像素）
     */
    private int width;

    public static ExcelTitle generate(String value, int width){
        ExcelTitle title = new ExcelTitle();
        title.setValue(value);
        title.setWidth(width);
        return title;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }
}

2、工具类

/**
 * excel 工具类
 * @author yanglizhe
 *
 */
public class ExcelUtils {

    public static void export( ExcelBean excelBean, HttpServletResponse response) throws Exception{
        String filename = excelBean.getName();
        filename = new String(filename.replaceAll("\\s|;", "").getBytes("gbk"), "ISO8859-1");

        response.setContentType("application/octet-stream;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-disposition", "attachment;filename=" + filename);
        OutputStream outputStream = response.getOutputStream();
        export(excelBean, outputStream);
    }

    @SuppressWarnings("resource")
    public static void export( ExcelBean excelBean, OutputStream outputStream) throws Exception{
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet(excelBean.getSheetName());
        HSSFRow row = sheet.createRow(0);

        //设置样式
        HSSFCellStyle style = wb.createCellStyle();
        if(excelBean.isHeadBold()){
            HSSFFont headfont = wb.createFont();
            headfont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            style.setFont(headfont);
        }

        HSSFCell cell;
        ExcelTitle[] titles = excelBean.getTitles();
        for(int i=0; i < titles.length; i++){
            ExcelTitle title = titles[i];
            cell= row.createCell(i);
            cell.setCellValue(title.getValue());
            cell.setCellStyle(style);
            int columnWidth = title.getWidth() > 0 ? title.getWidth() : excelBean.getColumnWidth();
            sheet.setColumnWidth(i, getColWidth(columnWidth));
        }

        int rowNumber = 1;
        int rowHeihgt = excelBean.getRowHeight();
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        for(String[] data : excelBean.getDataList()){
            row = sheet.createRow(rowNumber ++ );
            if(rowHeihgt > 0){
                row.setHeight((short) getRowHeight(rowHeihgt));
            }
            else{
                rowHeihgt = 18;
            }
            for(int j=0; j<data.length; j ++){
                String value = data[j];
                cell = row.createCell(j);

                if(isUrl(value)){
                    if(isImage(value)){
                        int columnWidth = titles[j].getWidth() > 0 ? titles[j].getWidth() : excelBean.getColumnWidth();
                        ExcelImage excelImage = new ExcelImage(value);
                        ExcelBox excelBox = new ExcelBox(excelImage.getWidth(), excelImage.getHeight(), rowHeihgt, columnWidth, 10);
                        HSSFClientAnchor anchor = new HSSFClientAnchor();
                        int cw = getColWidth(columnWidth);
                        int rh = getRowHeight(rowHeihgt);
                        short col = (short)(j);
                        int rowNum = rowNumber-1;
                        anchor.setDx1(getAnchorX(excelBox.getX1(), cw));
                        anchor.setDy1(getAnchorY(excelBox.getY1(), rh));
                        anchor.setDx2(getAnchorX(excelBox.getX2(), cw));
                        anchor.setDy2(getAnchorY(excelBox.getY2(), rh));
                        anchor.setCol1(col);
                        anchor.setRow1(rowNum);
                        anchor.setCol2(col);
                        anchor.setRow2(rowNum);

                        anchor.setAnchorType(0);
                        patriarch.createPicture(anchor , wb.addPicture(excelImage.getByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
                    }
                    else{
                        cell.setCellValue(value);
                        cell.setCellFormula("HYPERLINK(\"" + value + "\",\"" + value + "\")");
                        HSSFCellStyle linkStyle = wb.createCellStyle();
                        HSSFFont cellFont= wb.createFont();
                        cellFont.setUnderline((byte) 1);
                        cellFont.setColor(HSSFColor.BLUE.index);
                        linkStyle.setFont(cellFont);
                        linkStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                        cell.setCellStyle(linkStyle);
                    }
                }
                else{
                    cell.setCellValue(value);
                    HSSFCellStyle cellStyle = wb.createCellStyle();
                    cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
                    cell.setCellStyle(cellStyle);
                }
            }
        }

        wb.write(outputStream);
        outputStream.flush();
        outputStream.close();

    }

    /**
     * 获取图片x方向长度坐标转换
     * @param px
     * @param colWidth
     * @return
     */
    public static  int getAnchorX(int px, int colWidth){
        return (int) Math.round(( (double) 701 * 16000.0 / 301)*((double)1/colWidth)*px);
    }  

    /**
     * 获取图片y方向长度坐标转换
     * @param px
     * @param rowHeight
     * @return
     */
    public static int getAnchorY(int px, int rowHeight){
        return (int) Math.round(( (double) 144 * 8000 / 301)*((double)1/rowHeight)*px);
    }  

    /**
     * 行高转换
     * @param px
     * @return
     */
    public static int getRowHeight( int px ){
        return (int) Math.round(((double) 4480 / 300 ) * px);
    }

    /**
     * 列宽转换
     * @param px
     * @return
     */
    public static int getColWidth( int px ){
        return (int) Math.round(((double) 10971 / 300 ) * px);
    }

    /**
     * 判断是否为链接地址
     */
    public static boolean isUrl(String string){
        Pattern pattern = Pattern.compile("^((http|https):\\/\\/([\\w\\-]+\\.)+[\\w\\-]+(\\/[\\w\\u4e00-\\u9fa5\\-\\.\\/?\\@\\%\\!\\&=\\+\\~\\:\\#\\;\\,]*)?)", Pattern.CASE_INSENSITIVE );
        return pattern.matcher(string).matches();
    }

    /**
     * 判断是否为图片
     */
    public static boolean isImage(String string){
        Pattern pattern = Pattern.compile("\\S+\\.(jpg|jpeg|png|gif|bmp)(\\?\\S+)?$", Pattern.CASE_INSENSITIVE );
        return isUrl(string) && pattern.matcher(string).matches();
    }

}

3、Demo

List<PictureTopVo> list = statisticsService.topList(from, to, limit, orderBy);
        ExcelTitle[] titles = {
                ExcelTitle.generate("图片名称", 400),
                ExcelTitle.generate("缩略图", 100),
                ExcelTitle.generate("访问次数", 100),
                ExcelTitle.generate("回复次数", 100)};
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String fileName = format.format(from) + "至"+ format.format(to) + "TOP" + limit +"统计.xls";
        ExcelBean excelBean = new ExcelBean(fileName, "统计", titles);
        for(PictureTopVo pictureTopVo : list){
            excelBean.add(new String[]{pictureTopVo.getName(), pictureTopVo.getPath() + "?size=80", String.valueOf(pictureTopVo.getVisitCount()), String.valueOf(pictureTopVo.getFillCount())});
        }
        excelBean.setRowHeight(100);
        ExcelUtils.export(excelBean, respone);

4、maven

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.13</version>
</dependency>