ExcelToHtmlServer.java
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package com.bckefu.excel.html;
import com.bckefu.excel.entity.ExcelToHtmlParams;
import com.bckefu.excel.html.helper.CellValueHelper;
import com.bckefu.excel.html.helper.MergedRegionHelper;
import com.bckefu.excel.html.helper.StylerHelper;
import com.bckefu.excel.util.PoiPublicUtil;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.misc.BASE64Encoder;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* @author : caoliang
* @date : 2017/11/20 下午3:16
*/
public class ExcelToHtmlServer {
private static final Logger LOGGER = LoggerFactory
.getLogger(ExcelToHtmlServer.class);
private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy_MM_dd");
private String today;
private Workbook wb;
private int sheetNum;
private int cssRandom;
/*是不是完成界面*/
private boolean completeHTML;
private Formatter out;
/*已经完成范围处理*/
private boolean gotBounds;
private int firstColumn;
private int endColumn;
private String imageCachePath;
private static final String COL_HEAD_CLASS = "colHeader";
//private static final String ROW_HEAD_CLASS = "rowHeader";
private static final String DEFAULTS_CLASS = "excelDefaults";
//图片缓存
private Map<String, PictureData> pictures = new HashMap<String, PictureData>();
public ExcelToHtmlServer(ExcelToHtmlParams params) {
this.wb = params.getWb();
this.completeHTML = params.isCompleteHTML();
this.sheetNum = params.getSheetNum();
cssRandom = (int) Math.ceil(Math.random() * 1000);
this.imageCachePath = params.getPath();
today = new SimpleDateFormat("yyyy_MM_dd").format(new Date());
}
public String printPage() {
try {
ensureOut();
if (completeHTML) {
out.format("<!DOCTYPE HTML>%n");
out.format("<html>%n");
out.format(
"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">%n");
out.format("<head>%n");
}
if (StringUtils.isNotEmpty(imageCachePath)) {
getPictures();
}
new StylerHelper(wb, out, sheetNum, cssRandom);
if (completeHTML) {
out.format("</head>%n");
out.format("<body>%n");
}
print();
if (completeHTML) {
out.format("</body>%n");
out.format("</html>%n");
}
return out.toString();
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
} finally {
if (out != null) {
out.close();
}
}
return null;
}
/**
* 获取Sheet缓存的图片
*/
private void getPictures() {
if (wb instanceof XSSFWorkbook) {
pictures = PoiPublicUtil.getSheetPictrues07((XSSFSheet) wb.getSheetAt(sheetNum),
(XSSFWorkbook) wb);
} else {
pictures = PoiPublicUtil.getSheetPictrues03((HSSFSheet) wb.getSheetAt(sheetNum),
(HSSFWorkbook) wb);
}
}
private void print() {
printSheets();
}
private void ensureOut() {
if (out == null) {
out = new Formatter(new StringBuilder());
}
}
private void printSheets() {
Sheet sheet = wb.getSheetAt(sheetNum);
printSheet(sheet);
}
private void printSheet(Sheet sheet) {
out.format("<table class='%s' width='%s'>%n", DEFAULTS_CLASS, getTableWidth(sheet));
printCols(sheet);
printSheetContent(sheet);
out.format("</table>%n");
}
private void printCols(Sheet sheet) {
//out.format("<col/>%n");
ensureColumnBounds(sheet);
for (int i = firstColumn; i < endColumn; i++) {
out.format("<col style='width:%spx;' />%n", sheet.getColumnWidth(i) / 32);
}
}
private int getTableWidth(Sheet sheet) {
ensureColumnBounds(sheet);
int width = 0;
for (int i = firstColumn; i < endColumn; i++) {
width = width + (sheet.getColumnWidth(i) / 32);
}
return width;
}
private void ensureColumnBounds(Sheet sheet) {
if (gotBounds) {
return;
}
Iterator<Row> iter = sheet.rowIterator();
firstColumn = (iter.hasNext() ? Integer.MAX_VALUE : 0);
endColumn = 0;
while (iter.hasNext()) {
Row row = iter.next();
short firstCell = row.getFirstCellNum();
if (firstCell >= 0) {
firstColumn = Math.min(firstColumn, firstCell);
endColumn = Math.max(endColumn, row.getLastCellNum());
}
}
gotBounds = true;
}
@SuppressWarnings("unused")
/**本来是用来生成 A，B 那个列名称的**/
private void printColumnHeads(Sheet sheet) {
out.format("<thead>%n");
out.format(" <tr class=%s>%n", COL_HEAD_CLASS);
out.format(" <th class=%s>◊</th>%n", COL_HEAD_CLASS);
StringBuilder colName = new StringBuilder();
for (int i = firstColumn; i < endColumn; i++) {
colName.setLength(0);
int cnum = i;
do {
colName.insert(0, (char) ('A' + cnum % 26));
cnum /= 26;
} while (cnum > 0);
out.format(" <th class=%s>%s</th>%n", COL_HEAD_CLASS, colName);
}
out.format(" </tr>%n");
out.format("</thead>%n");
}
private void printSheetContent(Sheet sheet) {
//printColumnHeads(sheet);
MergedRegionHelper mergedRegionHelper = new MergedRegionHelper(sheet);
CellValueHelper cellValueHelper = new CellValueHelper(wb, cssRandom);
out.format("<tbody>%n");
Iterator<Row> rows = sheet.rowIterator();
int rowIndex = 1;
while (rows.hasNext()) {
Row row = rows.next();
out.format(" <tr style='height:%spx;'>%n", row.getHeight() / 15);
//out.format(" <td class='%s'>%d</td>%n", ROW_HEAD_CLASS, row.getRowNum() + 1);
for (int i = firstColumn; i < endColumn; i++) {
if (mergedRegionHelper.isNeedCreate(rowIndex, i)) {
String content = " ";
CellStyle style = null;
if (i >= row.getFirstCellNum() && i < row.getLastCellNum()) {
Cell cell = row.getCell(i);
if (cell != null) {
style = cell.getCellStyle();
content = cellValueHelper.getHtmlValue(cell);
}
}
if (pictures.containsKey((rowIndex - 1) + "_" + i)) {
content = "<img src='data:image/" + PoiPublicUtil.getFileExtendName(pictures.get((rowIndex - 1) + "_" + i).getData())
+ ";base64," + getImageSrc(pictures.get((rowIndex - 1) + "_" + i))
+ "' style='max-width: "
+ getImageMaxWidth(
mergedRegionHelper.getRowAndColSpan(rowIndex, i), i, sheet)
+ "px;' />";
}
if (mergedRegionHelper.isMergedRegion(rowIndex, i)) {
Integer[] rowAndColSpan = mergedRegionHelper.getRowAndColSpan(rowIndex, i);
out.format(" <td rowspan='%s' colspan='%s' class='%s' >%s</td>%n",
rowAndColSpan[0], rowAndColSpan[1], styleName(style), content);
} else {
out.format(" <td class='%s'>%s</td>%n", styleName(style), content);
}
}
}
out.format(" </tr>%n");
rowIndex++;
}
out.format("</tbody>%n");
}
/**
* 获取图片最大宽度
*
* @param colIndex
* @param sheet
* @param rowAndColSpan
* @return
*/
private int getImageMaxWidth(Integer[] rowAndColSpan, int colIndex, Sheet sheet) {
if (rowAndColSpan == null) {
return sheet.getColumnWidth(colIndex) / 32;
}
int maxWidth = 0;
for (int i = 0; i < rowAndColSpan[1]; i++) {
maxWidth += sheet.getColumnWidth(colIndex + i) / 32;
}
return maxWidth;
}
/**
* 获取图片路径
*
* @param pictureData
* @return
*/
private String getImageSrc(PictureData pictureData) {
if (pictureData == null) {
return "";
}
byte[] data = pictureData.getData();
//直接输出到HTML使用BASE64Encoder
// 加密
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);
/*String fileName = "pic" + Math.round(Math.random() * 100000000000L);
fileName += "." + PoiPublicUtil.getFileExtendName(data);
if (!imageCachePath.startsWith("/") && !imageCachePath.contains(":")) {
imageCachePath = PoiPublicUtil.getWebRootPath(imageCachePath);
}
File savefile = new File(imageCachePath + "/" + today);
if (!savefile.exists()) {
savefile.mkdirs();
}
savefile = new File(imageCachePath + "/" + today + "/" + fileName);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(savefile);
fos.write(data);
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
} finally {
try {
fos.close();
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
}
}
return imageCachePath + "/" + today + "/" + fileName;*/
}
private String styleName(CellStyle style) {
if (style == null) {
return "";
}
return String.format("style_%02x_%s font_%s_%s", style.getIndex(), cssRandom,
style.getFontIndex(), cssRandom);
}
}