excle网页上预览

原先试了aspose-cells 想把xlsx转成pdf 然后实行在线预览，但是发现转的时候没报错，但是查看的时候检查不了，在网上翻了好久，

只找到一个类似案例，意思就是实际已经转好了，改了后缀名就能看到，我改了后发现和原先一样就是多了水印，合着就是加了一个水印啊，果断放弃

我想后来转成html也能实现预览，然后 就把网上的找了一个工具类，改改 就可以了

我加了点东西 就是把所有的sheet 一起显示预览

首先是jar包

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.9</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>3.9</version>
</dependency>

然后是前台的代码

<button type="button" id="excletopdf">excel文件预览</button>

jquery ：

$("#excletopdf").on("click",function(){
window.open("/b2b/excel/preview");
})

后台代码

--------------------------------------------------------------------------------------------------------------------------------------------------

controller ：

@Controller
@RequestMapping("/excel")
public class ExcelPreview {

//java web Excel在网页预览
@RequestMapping("/preview")
public void ss(HttpServletResponse response) throws Exception {
new ExcelToHTML().printreadExcelToHtml(response,"D:\test\11.xlsx", true);
}
}

--------------------------------------------------------------------------------------------------------------------------------------------------

service ：

import org.apache.poi.hssf.usermodel.*;
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.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.Test;

import com.aspose.words.Document;
import com.aspose.words.License;
import com.aspose.words.SaveFormat;

import java.io.*;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

public class ExcelToHTML {

// 我把原先的注释掉了 改成符合我要求的

// 加了这个方法 就能实现多个sheet 放在一个html

private static String getExcelInfo(Workbook wb,boolean isWithStyle){


// Sheet sheet = wb.getSheetAt(0);//获取第一个Sheet的内容

// workbook.getNumberOfSheets(); 打印 sheet的数量
System.out.println("----------------"+wb.getNumberOfSheets());
// 如果要全部的sheet都打印的话 那就回变成

String str="";
for(int i=0;i<wb.getNumberOfSheets();i++) {

str+=getExcelInfo(wb,wb.getSheetAt(i),isWithStyle);


str+="<br/> <br/> <br/> <br/>"; //sheet 中间隔了四行

}





return str;
}




private static String getExcelInfo(Workbook wb,Sheet sheet,boolean isWithStyle){
StringBuffer sb = new StringBuffer();

int lastRowNum = sheet.getLastRowNum();
Map<String, String> map[] = getRowSpanColSpanMap(sheet);
sb.append("<table 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 ><nobr> </nobr></td></tr>");
continue;
}
sb.append("<tr>");
int lastColNum = row.getLastCellNum();
for (int colNum = 0; colNum < lastColNum; colNum++) {
cell = row.getCell(colNum);
if (cell == null) { //特殊情况 空白的单元格会返回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 ");
}

//判断是否需要样式
if(isWithStyle){
dealExcelStyle(wb, sheet, cell, sb);//处理单元格样式
}

sb.append("><nobr>");
if (stringValue == null || "".equals(stringValue.trim())) {
sb.append(" ");
} else {
// 将ascii码为160的空格转换为html下的空格（ ）
sb.append(stringValue.replace(String.valueOf((char) 160)," "));
}
sb.append("</nobr></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;
}


/**
* 获取表格单元格Cell内容
* @param cell
* @return
*/
private static String getCellValue(Cell cell) {

String result = new String();
switch (cell.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:// 数字类型
if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
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) {
// 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，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 {
double value = cell.getNumericCellValue();
CellStyle style = cell.getCellStyle();
DecimalFormat format = new DecimalFormat();
String temp = style.getDataFormatString();
// 单元格设置成常规
if (temp.equals("General")) {
format.applyPattern("#");
}
result = format.format(value);
}
break;
case Cell.CELL_TYPE_STRING:// String类型
result = cell.getRichStringCellValue().toString();
break;
case Cell.CELL_TYPE_BLANK:
  result = " &nbsp";  // 原先是   result = " "; 这样会让单元很小  加了 &nbsp 就能把单元格撑起了 更好看了
break;
default:
  result = " &nbsp";
break;
}
return result;
}

/**
* 处理表格样式
* @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) {
short alignment = cellStyle.getAlignment();
// sb.append("align='" + convertAlignToHtml(alignment) + "' ");//单元格内容的水平对齐方式
short verticalAlignment = cellStyle.getVerticalAlignment();
sb.append("valign='"+ convertVerticalAlignToHtml(verticalAlignment)+ "' ");//单元格中内容的垂直排列方式

if (wb instanceof XSSFWorkbook) {

XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont();
short boldWeight = xf.getBoldweight();
String align = convertAlignToHtml(alignment);
sb.append("style='");
sb.append("font-weight:" + boldWeight + ";"); // 字体加粗
sb.append("font-size: " + xf.getFontHeight() / 2 + "%;"); // 字体大小
int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ;
sb.append("" + columnWidth + "px;");
sb.append("text-align:" + align + ";");//表头排版样式
XSSFColor xc = xf.getXSSFColor();
if (xc != null && !"".equals(xc)) {
sb.append("color:#" + xc.getARGBHex().substring(2) + ";"); // 字体颜色
}

XSSFColor bgColor = (XSSFColor) cellStyle.getFillForegroundColorColor();
if (bgColor != null && !"".equals(bgColor)) {
sb.append("background-color:#" + bgColor.getARGBHex().substring(2) + ";"); // 背景颜色
}
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(); // 类HSSFPalette用于求的颜色的国际标准形式
HSSFColor hc = palette.getColor(fontColor);
sb.append("font-weight:" + boldWeight + ";"); // 字体加粗
sb.append("font-size: " + hf.getFontHeight() / 2 + "%;"); // 字体大小
String align = convertAlignToHtml(alignment);
sb.append("text-align:" + align + ";");//表头排版样式
String fontColorStr = convertToStardColor(hc);
if (fontColorStr != null && !"".equals(fontColorStr.trim())) {
sb.append("color:" + fontColorStr + ";"); // 字体颜色
}
int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ;
sb.append("" + 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 + ";"); // 背景颜色
}
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("' ");
}
}

/**
* 单元格内容的水平对齐方式
* @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;
}

/**
* 单元格中内容的垂直排列方式
* @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 "";
}





// 以下是我自己写的 借鉴第一个方法
public static void printreadExcelToHtml(HttpServletResponse response,String filePath , 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 XSSFWorkbook) { //03版excel处理方法
XSSFWorkbook xWb = (XSSFWorkbook) wb;
htmlExcel = ExcelToHTML.getExcelInfo(xWb,isWithStyle);
}else if(wb instanceof HSSFWorkbook){ //07及10版以后的excel处理方法
HSSFWorkbook hWb = (HSSFWorkbook) wb;
htmlExcel = ExcelToHTML.getExcelInfo(hWb,isWithStyle);
}
priteFile(response,htmlExcel);
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}

}



// 输出流打印出来
private static void priteFile(HttpServletResponse response,String content) throws Exception{

StringBuilder sb = new StringBuilder();


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>");


FileInputStream bis = null;
OutputStream os1 = null;
FileOutputStream os=null;
try {

File file1 = new File("D:\test");
if (!file1.exists()) {// 目录不存在就创建
file1.mkdirs();
}
File file = new File("D:\test\11.html"); //新建一个空白pdf文档
if (file.exists()) {
file.delete();
}


// 把 sb 写入html

PrintStream printStream = new PrintStream(new FileOutputStream(file));
printStream.println(sb.toString());//将字符串写入文件

//输出到浏览器
response.setContentType("text/html; charset=UTF-8");
//response.setContentType("application/pdf");
bis = new FileInputStream(file.getPath());
os1 = response.getOutputStream();
int count = 0;
byte[] buffer = new byte[1024 * 1024];
while ((count =bis.read(buffer)) != -1){
os1.write(buffer, 0,count);
}
os1.flush();
} catch (Exception e) {
e.printStackTrace();
}finally {
if (os1 !=null){
os1.close();
}
if (os !=null){
os.close();
}
if (bis !=null){
bis.close();
}
}


}

}

这些是在我自己搭建的测试项目里 改改就可以拿来用了 ~