借鑑某大神的代碼結合自己做的項目，實現java導出excel在線預覽，發現使用SXSSFWORKBOOR的很少，所以貼出來供同行們參考，不用生成html文件在讀取，原文已找不到，希望能幫到需要的人
1.頁面
<body>
<div id="jsonstr">
${jsonStr}
</div>
</body>
2.java 後臺
ExportExcel jsonStr= exportExcel.ExcelToHtmlTo();
ExportExcel.java
public String ExcelToHtmlTo(){
StringBuilder sb = new StringBuilder();
if(wb instanceof SXSSFWorkbook){ //07及10版以後的excel處理方法
SXSSFWorkbook hWb = (SXSSFWorkbook) wb;
String htmlExcel = ExcelToHtml.getExcelInfo(hWb,true);
sb.append(htmlExcel);
}
return sb.toString();
}
ExcelToHtml.java
package com.datacenter.jeefp.common.utils.excel;
import java.io.*;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import com.datacenter.jeefp.common.utils.CheckUtil;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
/**
* Excel轉html
*
*/
public class ExcelToHtml {
/**
* @param filePath excel源文件文件的路徑
* @param htmlPositon 生成的html文件的路徑
* @param isWithStyle 是否需要表格樣式 包含 字體 顏色 邊框 對齊方式
*/
public static String readExcelToHtml(String filePath ,String htmlPositon, boolean isWithStyle){
InputStream is = null;
String htmlExcel = null;
try {
File sourcefile = new File(filePath);
is = new FileInputStream(sourcefile);
Workbook wb = WorkbookFactory.create(is);
if(wb instanceof SXSSFWorkbook){ //07及10版以後的excel處理方法
SXSSFWorkbook hWb = (SXSSFWorkbook) wb;
htmlExcel = ExcelToHtml.getExcelInfo(hWb,isWithStyle);
}
else if(wb instanceof HSSFWorkbook){ //07及10版以後的excel處理方法
HSSFWorkbook hWb = (HSSFWorkbook) wb;
htmlExcel = ExcelToHtml.getExcelInfo(hWb,isWithStyle);
}else if (wb instanceof XSSFWorkbook) { //03版excel處理方法
XSSFWorkbook xWb = (XSSFWorkbook) wb;
htmlExcel = ExcelToHtml.getExcelInfo(xWb,isWithStyle);
}
writeFile(htmlExcel,htmlPositon);
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return htmlPositon;
}
public static String getExcelInfo(Workbook wb,boolean isWithStyle){
StringBuffer sb = new StringBuffer();
Sheet sheet = wb.getSheetAt(0);//獲取第一個Sheet的內容
int lastRowNum = sheet.getLastRowNum();
Map<String, String> map[] = getRowSpanColSpanMap(sheet);
sb.append("<table border='1' style='border-collapse:collapse;' width='100%'>");
Row row = null; //兼容
Cell cell = null; //兼容
for (int rowNum = sheet.getFirstRowNum(); rowNum <= lastRowNum; rowNum++) {
row = sheet.getRow(rowNum);
if (row == null) {
sb.append("<tr><td ></td></tr>");
continue;
}
sb.append("<tr>");
int lastColNum = row.getLastCellNum();
for (int colNum = 0; colNum < lastColNum; colNum++) {
cell = row.getCell(colNum);
if (cell == null) { //特殊情況 空白的單元格會返回null
sb.append("<td> </td>");
continue;
}
String stringValue = getCellValue(cell);
if (map[0].containsKey(rowNum + "," + colNum)) {
String pointString = map[0].get(rowNum + "," + colNum);
map[0].remove(rowNum + "," + colNum);
int bottomeRow = Integer.valueOf(pointString.split(",")[0]);
int bottomeCol = Integer.valueOf(pointString.split(",")[1]);
int rowSpan = bottomeRow - rowNum + 1;
int colSpan = bottomeCol - colNum + 1;
sb.append("<td rowspan= '" + rowSpan + "' colspan= '"+ colSpan + "' ");
} else if (map[1].containsKey(rowNum + "," + colNum)) {
map[1].remove(rowNum + "," + colNum);
continue;
} else {
sb.append("<td ");
}
//判斷是否需要樣式
if(isWithStyle){
dealExcelStyle(wb, sheet, cell, sb);//處理單元格樣式
}
sb.append(">");
if (stringValue == null || "".equals(stringValue.trim())) {
sb.append(" ");
} else {
// 將ascii碼爲160的空格轉換爲html下的空格（ ）
sb.append(stringValue.replace(String.valueOf((char) 160)," "));
}
sb.append("</td>");
}
sb.append("</tr>");
}
sb.append("</table>");
return sb.toString();
}
private static Map<String, String>[] getRowSpanColSpanMap(Sheet sheet) {
Map<String, String> map0 = new HashMap<String, String>();
Map<String, String> map1 = new HashMap<String, String>();
int mergedNum = sheet.getNumMergedRegions();
CellRangeAddress range = null;
for (int i = 0; i < mergedNum; i++) {
range = sheet.getMergedRegion(i);
int topRow = range.getFirstRow();
int topCol = range.getFirstColumn();
int bottomRow = range.getLastRow();
int bottomCol = range.getLastColumn();
map0.put(topRow + "," + topCol, bottomRow + "," + bottomCol);
// System.out.println(topRow + "," + topCol + "," + bottomRow + "," + bottomCol);
int tempRow = topRow;
while (tempRow <= bottomRow) {
int tempCol = topCol;
while (tempCol <= bottomCol) {
map1.put(tempRow + "," + tempCol, "");
tempCol++;
}
tempRow++;
}
map1.remove(topRow + "," + topCol);
}
Map[] map = { map0, map1 };
return map;
}
/**
* 獲取表格單元格Cell內容
* @param cell
* @return
*/
private static String getCellValue(Cell cell) {
// FormulaEvaluator evaluator=wb.getCreationHelper().createFormulaEvaluator();
DecimalFormat df = new DecimalFormat("0");
DecimalFormat dfFloar = new DecimalFormat("0.00");
String result = new String();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:// 數字類型
if (HSSFDateUtil.isCellDateFormatted(cell)) {// 處理日期格式、時間格式
SimpleDateFormat sdf = null;
if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) {
sdf = new SimpleDateFormat("HH:mm");
} else {// 日期
sdf = new SimpleDateFormat("yyyy-MM-dd");
}
Date date = cell.getDateCellValue();
result = sdf.format(date);
} else if (cell.getCellStyle().getDataFormat() == 58) {
// 處理自定義日期格式：m月d日(通過判斷單元格的格式id解決，id的值是58)
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
double value = cell.getNumericCellValue();
Date date = org.apache.poi.ss.usermodel.DateUtil
.getJavaDate(value);
result = sdf.format(date);
} else {
Object val= cell.getNumericCellValue();
Boolean isNum = false;//data是否爲數值型
// Boolean isInteger=false;//data是否爲整數
// Boolean isPercent=false;//data是否爲百分數
if (val != null || "".equals(val)) {
val=val.toString().trim();
//判斷data是否爲數值型
isNum = val.toString().matches("^(-?\\d+)(\\.\\d+)?$");
//判斷data是否爲整數（小數部分是否爲0）
// isInteger=val.toString().matches("^[-\\+]?[\\d]*$");
//判斷data是否爲百分數（是否包含“%”）
// isPercent=val.toString().contains("%");
}
//如果單元格內容是數值類型，涉及到金錢（金額、本、利），則設置cell的類型爲數值型，設置data的類型爲數值類型
if (isNum) {
String valTe=(String)val;
if (!CheckUtil.isNull(valTe) && (valTe.substring(valTe.length()-1,valTe.length()).equals("0") || valTe.substring(valTe.length()-2,valTe.length()).equals("00"))){
result=(valTe.split("\\.")[0]);
}
} else {
String valTe=dfFloar.format(cell.getNumericCellValue());
if (!CheckUtil.isNull(valTe) && (valTe.substring(valTe.length()-1,valTe.length()).equals("0") || valTe.substring(valTe.length()-2,valTe.length()).equals("00"))){
result=(valTe.split("\\.")[0]);
}
// result = dfFloar.format(cell.getNumericCellValue());
}
// result = cell.getNumericCellValue();
// CellStyle style = cell.getCellStyle();
// DecimalFormat format = new DecimalFormat();
// String temp = style.getDataFormatString();
// 單元格設置成常規
// if (temp.equals("General")) {
// format.applyPattern("#");
// }
// result = format.format(value);
// result = String.valueOf(value);
}
break;
case Cell.CELL_TYPE_STRING:// String類型
result = cell.getRichStringCellValue().toString();
break;
case Cell.CELL_TYPE_BLANK:
result = "";
break;
case Cell.CELL_TYPE_FORMULA:
try {
Object val= cell.getNumericCellValue();
Boolean isNum = false;//data是否爲數值型
// Boolean isInteger=false;//data是否爲整數
// Boolean isPercent=false;//data是否爲百分數
if (val != null || "".equals(val)) {
val=val.toString().trim();
//判斷data是否爲數值型
isNum = val.toString().matches("^(-?\\d+)(\\.\\d+)?$");
//判斷data是否爲整數（小數部分是否爲0）
// isInteger=val.toString().matches("^[-\\+]?[\\d]*$");
//判斷data是否爲百分數（是否包含“%”）
// isPercent=val.toString().contains("%");
}
//如果單元格內容是數值類型，涉及到金錢（金額、本、利），則設置cell的類型爲數值型，設置data的類型爲數值類型
if (isNum) {
String valTe=(String)val;
if (!CheckUtil.isNull(valTe) && (valTe.substring(valTe.length()-1,valTe.length()).equals("0") || valTe.substring(valTe.length()-2,valTe.length()).equals("00"))){
result=(valTe.split("\\.")[0]);
}
} else {
result = dfFloar.format(cell.getNumericCellValue());
}
// result = String.valueOf(cell.getNumericCellValue());
} catch (IllegalStateException e) {
result = String.valueOf(cell.getRichStringCellValue());
}
break;
default:
result = "";
break;
}
return result;
}
/**
* 處理表格樣式
* @param wb
* @param sheet
* @param sb
*/
private static void dealExcelStyle(Workbook wb,Sheet sheet,Cell cell,StringBuffer sb){
CellStyle cellStyle = cell.getCellStyle();
if (cellStyle != null) {
cellStyle.setWrapText(true);
short alignment = cellStyle.getAlignment();
// sb.append("align='" + convertAlignToHtml(alignment) + "' ");//單元格內容的水平對齊方式
short verticalAlignment = cellStyle.getVerticalAlignment();
sb.append("valign='"+ convertVerticalAlignToHtml(verticalAlignment)+ "' ");//單元格中內容的垂直排列方式
if (wb instanceof XSSFWorkbook || (wb instanceof SXSSFWorkbook) ) {
XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont();
short boldWeight = xf.getBoldweight();
String align = convertAlignToHtml(alignment);
sb.append("style='");
sb.append("word-wrap:break-word;"); // 自動換行
sb.append("font-weight:" + boldWeight + ";"); // 字體加粗
sb.append("font-size: " + xf.getFontHeight() / 2 + "%;"); // 字體大小
int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ;
sb.append("width:" + columnWidth + "px;");
sb.append("text-align:" + align + ";");//表頭排版樣式
XSSFColor xc = xf.getXSSFColor();
if (xc != null && !"".equals(xc)) {
sb.append("color:#" + xc.getARGBHex().substring(2) + ";"); // 字體顏色
}
XSSFColor bgColor = (XSSFColor) cellStyle.getFillForegroundColorColor();
if (bgColor != null && !"".equals(bgColor)) {
sb.append("background-color:#" + bgColor.getARGBHex().substring(2) + ";"); // 背景顏色
}
sb.append(getBorderStyle(0,cellStyle.getBorderTop(), ((XSSFCellStyle) cellStyle).getTopBorderXSSFColor()));
sb.append(getBorderStyle(1,cellStyle.getBorderRight(), ((XSSFCellStyle) cellStyle).getRightBorderXSSFColor()));
sb.append(getBorderStyle(2,cellStyle.getBorderBottom(), ((XSSFCellStyle) cellStyle).getBottomBorderXSSFColor()));
sb.append(getBorderStyle(3,cellStyle.getBorderLeft(), ((XSSFCellStyle) cellStyle).getLeftBorderXSSFColor()));
}else if(wb instanceof HSSFWorkbook){
HSSFFont hf = ((HSSFCellStyle) cellStyle).getFont(wb);
short boldWeight = hf.getBoldweight();
short fontColor = hf.getColor();
sb.append("style='");
HSSFPalette palette = ((HSSFWorkbook) wb).getCustomPalette(); // 類HSSFPalette用於求的顏色的國際標準形式
HSSFColor hc = palette.getColor(fontColor);
sb.append("font-weight:" + boldWeight + ";"); // 字體加粗
sb.append("font-size: " + hf.getFontHeight() / 2 + "%;"); // 字體大小
String align = convertAlignToHtml(alignment);
sb.append("text-align:" + align + ";");//表頭排版樣式
String fontColorStr = convertToStardColor(hc);
if (fontColorStr != null && !"".equals(fontColorStr.trim())) {
sb.append("color:" + fontColorStr + ";"); // 字體顏色
}
int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ;
sb.append("width:" + columnWidth + "px;");
short bgColor = cellStyle.getFillForegroundColor();
hc = palette.getColor(bgColor);
String bgColorStr = convertToStardColor(hc);
if (bgColorStr != null && !"".equals(bgColorStr.trim())) {
sb.append("background-color:" + bgColorStr + ";"); // 背景顏色
}
sb.append( getBorderStyle(palette,0,cellStyle.getBorderTop(),cellStyle.getTopBorderColor()));
sb.append( getBorderStyle(palette,1,cellStyle.getBorderRight(),cellStyle.getRightBorderColor()));
sb.append( getBorderStyle(palette,3,cellStyle.getBorderLeft(),cellStyle.getLeftBorderColor()));
sb.append( getBorderStyle(palette,2,cellStyle.getBorderBottom(),cellStyle.getBottomBorderColor()));
}
sb.append("' ");
}
}
/**
* 單元格內容的水平對齊方式
* @param alignment
* @return
*/
private static String convertAlignToHtml(short alignment) {
String align = "center";
switch (alignment) {
case CellStyle.ALIGN_LEFT:
align = "left";
break;
case CellStyle.ALIGN_CENTER:
align = "center";
break;
case CellStyle.ALIGN_RIGHT:
align = "right";
break;
default:
break;
}
return align;
}
/**
* 單元格中內容的垂直排列方式
* @param verticalAlignment
* @return
*/
private static String convertVerticalAlignToHtml(short verticalAlignment) {
String valign = "middle";
switch (verticalAlignment) {
case CellStyle.VERTICAL_BOTTOM:
valign = "bottom";
break;
case CellStyle.VERTICAL_CENTER:
valign = "center";
break;
case CellStyle.VERTICAL_TOP:
valign = "top";
break;
default:
break;
}
return valign;
}
private static String convertToStardColor(HSSFColor hc) {
StringBuffer sb = new StringBuffer("");
if (hc != null) {
if (HSSFColor.AUTOMATIC.index == hc.getIndex()) {
return null;
}
sb.append("#");
for (int i = 0; i < hc.getTriplet().length; i++) {
sb.append(fillWithZero(Integer.toHexString(hc.getTriplet()[i])));
}
}
return sb.toString();
}
private static String fillWithZero(String str) {
if (str != null && str.length() < 2) {
return "0" + str;
}
return str;
}
static String[] bordesr={"border-top:","border-right:","border-bottom:","border-left:"};
static String[] borderStyles={"solid ","solid ","solid ","solid ","solid ","solid ","solid ","solid ","solid ","solid","solid","solid","solid","solid"};
private static String getBorderStyle( HSSFPalette palette ,int b,short s, short t){
if(s==0)return bordesr[b]+borderStyles[s]+"#d0d7e5 1px;";;
String borderColorStr = convertToStardColor( palette.getColor(t));
borderColorStr=borderColorStr==null|| borderColorStr.length()<1?"#000000":borderColorStr;
return bordesr[b]+borderStyles[s]+borderColorStr+" 1px;";
}
private static String getBorderStyle(int b,short s, XSSFColor xc){
if(s==0)return bordesr[b]+borderStyles[s]+"#d0d7e5 1px;";;
if (xc != null && !"".equals(xc)) {
String borderColorStr = xc.getARGBHex();//t.getARGBHex();
borderColorStr=borderColorStr==null|| borderColorStr.length()<1?"#000000":borderColorStr.substring(2);
return bordesr[b]+borderStyles[s]+borderColorStr+" 1px;";
}
return "";
}
/*
* @param content 生成的excel表格標籤
* @param htmlPath 生成的html文件地址
*/
private static void writeFile(String content,String htmlPath){
File file2 = new File(htmlPath);
StringBuilder sb = new StringBuilder();
try {
file2.createNewFile();//創建文件
sb.append("<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>Html Test</title></head><body>");
sb.append("<div>");
sb.append(content);
sb.append("</div>");
sb.append("</body></html>");
PrintStream printStream = new PrintStream(new FileOutputStream(file2));
printStream.println(sb.toString());//將字符串寫入文件
} catch (IOException e) {
e.printStackTrace();
}
}
}
