excle网页上预览

Posted 2022-10-19 mr-y1907

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("width:" + 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("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 ~