邮件发送表格
- 问题导入
- 效果图
- 实现方案
- 1. 拼接HTML文件（不推荐）
- 2. excel 转HTML
- 使用工具类来转化
- 依赖
- 工具类
- 代码示例
- 使用已工具包 如 aspose-cells
- 依赖
- 代码示例
- 3.使用模板生成
- 流程
- 准备模板
- 工具类
- 代码示例
问题导入
在一些定时任务中，经常会出现发送邮件的需求。最近，本人就碰上一个发送邮件表格而不是作为附件发送的需求。
效果图
这种效果，实际上是在邮件正文里面填入HTML语言来实现的 。
实现方案
在网上搜索后，我发现了有三中普遍的实现方式。
1. 拼接HTML文件（不推荐）
这种方案，类似于写html文件一样写出来。只适合非常简单的表格。拼接和填充数据都需要自己手写。
代码大概是这样子。
StringBuilder content = new StringBuilder("<html><head></head><body>");
content.append("<table border=\"1\" style=\"width:1000px; height:150px;border:solid 1px #E8F2F9;font-size=14px;font-size:18px;\">");
content.append("<tr style=\"background-color: #428BCA; color:#ffffff\"><td rowspan=\"3\">交易时间</td>" +
"<td colspan=\"4\">实名认证</td>");
content.append("<tr>" +
"<td colspan=\"2\">支付中心</td>" +
"<td colspan=\"2\">业务线</td>" +
"</tr>");
content.append("<tr><td>笔数</td><td>金额</td><td>笔数</td><td>金额</td></tr>");
content.append("<tr>" +
"<td><span>20201118</span></td>" +
"<td><span>0</span></td>" +
"<td><span>0.00</span></td>" +
"<td><span>0</span></td>" +
"<td><span>0.00</span></td>" +
"</tr>");
content.append("</table>");
content.append("<h3>对账无误</h3>");
content.append("</body></html>");
引用的他人的代码片段。不想手写 o(╥﹏╥)o
效果
2. excel 转HTML
这种方案巧妙的避开了生成html文件的繁琐。避重就轻，直接操作更容易实现的excel来生成html代码。
使用工具类来转化
依赖
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.11.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-compress</artifactId>
<version>1.18</version>
</dependency>
<dependency>
<groupId>org.apache.xmlbeans</groupId>
<artifactId>xmlbeans</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>4.4</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-compress</artifactId>
<version>1.21</version>
</dependency>
工具类
import org.apache.commons.io.FileUtils;
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 java.io.*;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.*;
public class Excel2HtmlUtil {
/**
*
* @param filePath excel源文件文件的路径
* @param htmlPositon 生成的html文件的路径
* @param isWithStyle 是否需要表格样式 包含 字体 颜色 边框 对齐方式
* @throws Exception
*
*/
public static String readExcelToHtml(String filePath, String htmlPositon, boolean isWithStyle,String type,String attname) throws Exception {
InputStream is = null;
String htmlExcel = null;
Map<String,String> stylemap = new HashMap<String,String>();
try {
if("csv".equalsIgnoreCase(type)) {
htmlExcel = getCSVInfo(filePath,htmlPositon);
writeFile1(htmlExcel, htmlPositon,stylemap,attname);
}else {
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 = getExcelInfo(xWb, isWithStyle,stylemap);
} else if (wb instanceof HSSFWorkbook) { // 07及10版以后的excel处理方法
HSSFWorkbook hWb = (HSSFWorkbook) wb;
htmlExcel = getExcelInfo(hWb, isWithStyle,stylemap);
}
writeFile(htmlExcel, htmlPositon,stylemap,attname);
}
} catch (Exception e) {
System.out.println("文件被损坏或不能打开，无法预览");
//throw new Exception("文件被损坏或不能打开，无法预览");
} finally {
try {
if(is!=null)
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return htmlPositon;
}
private static void getcscvvalue(BufferedReader reader,List col,String oldvalue,List list) {
String line = null;
try {
while((line=reader.readLine())!=null){
String[] item = line.split(",",-1);
boolean isbreak = false;
for(int i=0;i<item.length;i++) {
String value = item[i];
if(value.endsWith("\"")) {
value = oldvalue+value;
col.add(value);
}else if(item.length==1) {
value = oldvalue+value;
getcscvvalue(reader,col,value,list);
isbreak = true;
}else if(value.startsWith("\"")){
getcscvvalue(reader,col,value,list);
isbreak = true;
}else {
col.add(value);
}
}
if(!isbreak) {
list.add(col);
col = new ArrayList();
}
}
} catch (IOException e) {
}
}
private static String getCSVInfo(String filePath,String htmlPositon) {
StringBuffer sb = new StringBuffer();
DataInputStream in = null;
try {
in=new DataInputStream(new FileInputStream(filePath));
BufferedReader reader=new BufferedReader(new InputStreamReader(in));
//reader.readLine();
String line = null;
List list = new ArrayList();
while((line=reader.readLine())!=null){
String[] item = line.split(",");
List col = new ArrayList();
for(int i=0;i<item.length;i++) {
String value = item[i];
if(value.startsWith("\"")) {
getcscvvalue(reader,col,value,list);
}else {
col.add(value);
}
}
list.add(col);
}
sb.append("<table>");
for(int i=0;i<list.size();i++) {
List col = (List) list.get(i);
if(col==null||col.size()==0) {
sb.append("<tr><td ></td></tr>");
}
sb.append("<tr>");
for(int j=0;j<col.size();j++) {
String value = (String) col.get(j);
if (value == null||"".equals(value)) {
sb.append("<td> </td>");
continue;
}else {
sb.append("<td>"+value+"</td>");
}
}
sb.append("</tr>");
}
sb.append("</table>");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
//读取excel文件，返回转换后的html字符串
private static String getExcelInfo(Workbook wb, boolean isWithStyle, Map<String,String> stylemap) {
StringBuffer sb = new StringBuffer();
StringBuffer ulsb = new StringBuffer();
ulsb.append("<ul>");
int num = wb.getNumberOfSheets();
//遍历excel文件里的每一个sheet
for(int i=0;i<num;i++) {
Sheet sheet = wb.getSheetAt(i);// 获取第i个Sheet的内容
String sheetName = sheet.getSheetName();
if(i==0) {
ulsb.append("<li id='li_"+i+"' class='cur' οnclick='changetab("+i+")'>"+sheetName+"</li>");
}else {
ulsb.append("<li id='li_"+i+"' οnclick='changetab("+i+")'>"+sheetName+"</li>");
}
int lastRowNum = sheet.getLastRowNum();
Map<String, String> map[] = getRowSpanColSpanMap(sheet);
Map<String, String> map1[] = getRowSpanColSpanMap(sheet);
sb.append("<table id='table_"+i+"' ");
if(i==0) {
sb.append("class='block'");
}
sb.append(">");
Row row = null; // 兼容
Cell cell = null; // 兼容
int maxRowNum = 0;
int maxColNum = 0;
//遍历每一行
for (int rowNum = sheet.getFirstRowNum(); rowNum <= lastRowNum; rowNum++) {
row = sheet.getRow(rowNum);
if (row == null) {
continue;
}
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
continue;
}
String stringValue = getCellValue1(cell);
if (map1[0].containsKey(rowNum + "," + colNum)) {
map1[0].remove(rowNum + "," + colNum);
if(maxRowNum<rowNum) {
maxRowNum = rowNum;
}
if(maxColNum<colNum) {
maxColNum = colNum;
}
} else if (map1[1].containsKey(rowNum + "," + colNum)) {
map1[1].remove(rowNum + "," + colNum);
if(maxRowNum<rowNum) {
maxRowNum = rowNum;
}
if(maxColNum<colNum) {
maxColNum = colNum;
}
continue;
}
if (stringValue == null || "".equals(stringValue.trim())) {
continue;
}else {
if(maxRowNum<rowNum) {
maxRowNum = rowNum;
}
if(maxColNum<colNum) {
maxColNum = colNum;
}
}
}
}
for (int rowNum = sheet.getFirstRowNum(); rowNum <= maxRowNum; 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 <= maxColNum; 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,stylemap);// 处理单元格样式
}
sb.append("><nobr>");
//如果单元格为空要判断该单元格是不是通过其他单元格计算得到的
if (stringValue == null || "".equals(stringValue.trim())) {
FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
if (evaluator.evaluate(cell) != null) {
//如果单元格的值是通过其他单元格计算来的，则通过单元格计算获取
String cellnumber = evaluator.evaluate(cell).getNumberValue() + "";
//如果单元格的值是小数，保留两位
if (null != cellnumber && cellnumber.contains(".")) {
String[] decimal = cellnumber.split("\\.");
if (decimal[1].length() > 2) {
int num1 = decimal[1].charAt(0) - '0';
int num2 = decimal[1].charAt(1) - '0';
int num3 = decimal[1].charAt(2) - '0';
if (num3 == 9) {
num2 = 0;
} else if (num3 >= 5) {
num2 = num2 + 1;
}
cellnumber = decimal[0] + "." + num1 + num2;
}
}
stringValue = cellnumber;
}
sb.append(stringValue.replace(String.valueOf((char) 160), " "));
} 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>");
}
ulsb.append("</ul>");
return ulsb.toString()+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;
}
private static String getCellValue1(Cell cell) {
String result = new String();
switch (cell.getCellType()) {
case NUMERIC:// 数字类型
result = "1";
break;
case STRING:// String类型
result = "1";
break;
case BLANK:
result = "";
break;
default:
result = "";
break;
}
return result;
}
/**
* 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 NUMERIC:// 数字类型
if (DateUtil.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 STRING:// String类型
result = cell.getRichStringCellValue().toString();
break;
case BLANK:
result = "";
break;
default:
result = "";
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,Map<String,String> stylemap) {
CellStyle cellStyle = cell.getCellStyle();
if (cellStyle != null) {
HorizontalAlignment alignment = cellStyle.getAlignment();
// sb.append("align='" + convertAlignToHtml(alignment) + "' ");//单元格内容的水平对齐方式
VerticalAlignment verticalAlignment = cellStyle.getVerticalAlignment();
String _style = "vertical-align:"+convertVerticalAlignToHtml(verticalAlignment)+";";
if (wb instanceof XSSFWorkbook) {
XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont();
//short boldWeight = xf.getBoldweight();
short boldWeight = 400;
String align = convertAlignToHtml(alignment);
int columnWidth = sheet.getColumnWidth(cell.getColumnIndex());
_style +="font-weight:" + boldWeight + ";font-size: " + xf.getFontHeight() / 2 + "%;width:" + columnWidth + "px;text-align:" + align + ";";
XSSFColor xc = xf.getXSSFColor();
if (xc != null && !"".equals(xc)) {
_style +="color:#" + xc.getARGBHex().substring(2) + ";";
}
XSSFColor bgColor = (XSSFColor) cellStyle.getFillForegroundColorColor();
if (bgColor != null && !"".equals(bgColor)) {
_style +="background-color:#" + bgColor.getARGBHex().substring(2) + ";"; // 背景颜色
}
_style +=getBorderStyle(0, cellStyle.getBorderTop().getCode(),((XSSFCellStyle) cellStyle).getTopBorderXSSFColor());
_style +=getBorderStyle(1, cellStyle.getBorderRight().getCode(),((XSSFCellStyle) cellStyle).getRightBorderXSSFColor());
_style +=getBorderStyle(2, cellStyle.getBorderBottom().getCode(),((XSSFCellStyle) cellStyle).getBottomBorderXSSFColor());
_style +=getBorderStyle(3, cellStyle.getBorderLeft().getCode(),((XSSFCellStyle) cellStyle).getLeftBorderXSSFColor());
} else if (wb instanceof HSSFWorkbook) {
HSSFFont hf = ((HSSFCellStyle) cellStyle).getFont(wb);
short boldWeight = hf.getFontHeight();
short fontColor = hf.getColor();
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);
String align = convertAlignToHtml(alignment);
int columnWidth = sheet.getColumnWidth(cell.getColumnIndex());
_style +="font-weight:" + boldWeight + ";font-size: " + hf.getFontHeight() / 2 + "%;text-align:" + align + ";width:" + columnWidth + "px;";
String fontColorStr = convertToStardColor(hc);
if (fontColorStr != null && !"".equals(fontColorStr.trim())) {
_style +="color:" + fontColorStr + ";"; // 字体颜色
}
short bgColor = cellStyle.getFillForegroundColor();
hc = palette.getColor(bgColor);
String bgColorStr = convertToStardColor(hc);
if (bgColorStr != null && !"".equals(bgColorStr.trim())) {
_style +="background-color:" + bgColorStr + ";"; // 背景颜色
}
_style +=getBorderStyle(palette, 0, cellStyle.getBorderTop().getCode(), cellStyle.getTopBorderColor());
_style +=getBorderStyle(palette, 1, cellStyle.getBorderRight().getCode(), cellStyle.getRightBorderColor());
_style +=getBorderStyle(palette, 3, cellStyle.getBorderLeft().getCode(), cellStyle.getLeftBorderColor());
_style +=getBorderStyle(palette, 2, cellStyle.getBorderBottom().getCode(), cellStyle.getBottomBorderColor());
}
String calssname="";
if(!stylemap.containsKey(_style)) {
int count = stylemap.size();
calssname = "td"+count;
stylemap.put(_style, calssname);
}else {
calssname = stylemap.get(_style);
}
if(!"".equals(calssname)) {
sb.append("class='"+calssname+"'");
}
}
}
/**
* 单元格内容的水平对齐方式
*
* @param alignment
* @return
*/
private static String convertAlignToHtml(HorizontalAlignment alignment) {
String align = "center";
switch (alignment) {
case LEFT:
align = "left";
break;
case CENTER:
align = "center";
break;
case 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(VerticalAlignment verticalAlignment) {
String valign = "middle";
switch (verticalAlignment) {
case BOTTOM:
valign = "bottom";
break;
case CENTER:
valign = "middle";
break;
case TOP:
valign = "top";
break;
default:
break;
}
return valign;
}
private static String convertToStardColor(HSSFColor hc) {
StringBuffer sb = new StringBuffer("");
if (hc != null) {
if (HSSFColor.HSSFColorPredefined.AUTOMATIC.getIndex() == 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表格标签
*
* @param htmlPath 生成的html文件地址
*/
private static void writeFile(String content, String htmlPath, Map<String,String> stylemap,String name) {
File file2 = new File(htmlPath);
StringBuilder sb = new StringBuilder();
try {
file2.createNewFile();// 创建文件
sb.append("<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>"+name+"</title><style type=\"text/css\">");
sb.append("ul{list-style: none;max-width: calc(100%);padding: 0px;margin: 0px;overflow-x: scroll;white-space: nowrap;} ul li{padding: 3px 5px;display: inline-block;border-right: 1px solid #768893;} ul li.cur{color: #F59C25;} table{border-collapse:collapse;display:none;width:100%;} table.block{display: block;}");
for(Map.Entry<String, String> entry : stylemap.entrySet()){
String mapKey = entry.getKey();
String mapValue = entry.getValue();
sb.append(" ."+mapValue+"{"+mapKey+"}");
}
sb.append("</style><script>");
sb.append("function changetab(i){var block = document.getElementsByClassName(\"block\");block[0].className = block[0].className.replace(\"block\",\"\");var cur = document.getElementsByClassName(\"cur\");cur[0].className = cur[0].className.replace(\"cur\",\"\");var curli = document.getElementById(\"li_\"+i);curli.className += ' cur';var curtable = document.getElementById(\"table_\"+i);curtable.className=' block';}");
sb.append("</script></head><body>");
sb.append("<div>");
sb.append(content);
sb.append("</div>");
sb.append("</body></html>");
FileUtils.write(file2, sb.toString(),"UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
}
private static void writeFile1(String content, String htmlPath, Map<String,String> stylemap,String name) {
File file2 = new File(htmlPath);
StringBuilder sb = new StringBuilder();
try {
file2.createNewFile();// 创建文件
sb.append("<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"><title>"+name+"</title><style type=\"text/css\">");
sb.append("ul{list-style: none;max-width: calc(100%);padding: 0px;margin: 0px;overflow-x: scroll;white-space: nowrap;} ul li{padding: 3px 5px;display: inline-block;border-right: 1px solid #768893;} ul li.cur{color: #F59C25;} table{border-collapse:collapse;width:100%;} td{border: solid #000000 1px; min-width: 200px;}");
sb.append("</style></head><body>");
sb.append("<div>");
sb.append(content);
sb.append("</div>");
sb.append("</body></html>");
FileUtils.write(file2, sb.toString(),"UTF-8");
} catch (IOException e) {
e.printStackTrace();
}
}
}
代码示例
public static void main(String[] args) {
String sourcepath = "D:\\myExcel.xlsx";
String htmlPositon = "D:\\测试.html";
Excel2HtmlUtil.readExcelToHtml(sourcepath, htmlPositon, true, "xlsx", "测试");
}
使用已工具包 如 aspose-cells
依赖
<repository>
<id>AsposeJavaAPI</id>
<name>Aspose Java API</name>
<url>https://repository.aspose.com/repo/</url>
</repository>
<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-cells</artifactId>
<version>20.11</version>
</dependency>
代码示例
使用 Aspose.Cells 将 Excel 转换为 HTML 非常简单。只需加载 Excel 电子表格并将其保存为 HTML 文件。以下是将 Excel XLSX 文件转换为 HTML 的步骤。
- 使用 Workbook 类加载 XLSX 文件。
- 使用 Workbook.Save(String) 方法以 .html 扩展名保存文件。
以下代码示例展示了如何使用 Java 将 Excel 文件转换为 HTML。
// 加载 Excel 文件
Workbook workbook = new Workbook("workbook.xlsx");
// 另存为 Excel XLSX 文件
workbook.save("Excel-to-HTML.html");
3.使用模板生成
流程
1、准备模板（这里是以Excel转html为模板）
2、处理模板及对模板填充内容的工具类
3、修改发送邮件的代码
准备模板
- 用excel 画一个所需表格模板
- 找一个在线 excel 转html 网站
如：我用的是：Table在线布局工具（Excel转HTML）
下载后，修改后缀名为.ftl
然后使用文本编辑器，稍作修改。
<tbody>
<tr height="26">
<td colspan="2" class="et23">统计周期</td>
<td colspan="5" class="et10"></td>
</tr>
<tr height="26">
<td colspan="2" class="et10">合作方</td>
<td colspan="2" class="et6">微信</td>
<td colspan="3" class="et6">支付宝</td>
</tr>
<tr height="26">
<td rowspan="7" class="et10">放款</td>
<td class="et11">申请笔数</td>
<td colspan="2" class="et6"></td>
<td colspan="3" class="et6"></td>
</tr>
<tr height="26">
<td class="et11">通过笔数</td>
<td colspan="2" class="et6"></td>
<td colspan="3" class="et6"></td>
</tr>
<tr height="26">
<td class="et11">拒绝笔数</td>
<td colspan="2" class="et6"></td>
<td colspan="3" class="et6"></td>
</tr>
<tr height="19">
<td rowspan="4" class="et11">拒绝原因枚举</td>
<td colspan="2" rowspan="4" class="et6">${data.apay.msg}</td>
<td colspan="3" rowspan="4" class="et6">${data.bpay.msg}</td>
</tr>
<tr height="19">
</tr>
<tr height="19">
</tr>
<tr height="18">
</tr>
<tr>
<td class="et2" rowspan="${data.maxLength+1} " >放款</td>
<td class="et8">放款计划</td>
<td class="et15">笔数</td>
<td class="et16">金额</td>
<td class="et8">放款计划</td>
<td class="et15">笔数</td>
<td class="et16">金额</td>
</tr>
<#list 0..(data.maxLength - 1) as i>
<tr>
<#if data.maxLength != 0>
<td class="et7">${data.apay.apayLoanInfoList[i].a!''}</td>
<td class="et15">${data.apay.apayLoanInfoList[i].b!''}</td>
<td class="et14">${data.apay.apayLoanInfoList[i].c!''}</td>
<td class="et7">${data.bpay.bpayLoanInfoList[i].a!''}</td>
<td class="et16">${data.bpay.bpayLoanInfoList[i].b!''}</td>
<td class="et14">${data.bpay.bpayLoanInfoList[i].c!''}</td>
</#if>
<#if data.maxLength = 0>
<td class="et7" ></td>
<td class="et15"></td>
<td class="et14"></td>
<td class="et7" ></td>
<td class="et16"></td>
<td class="et14"></td>
</#if>
</tr>
</#list>
</tbody>
工具类
package com.ajc.module.mail.util;
import java.io.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.xxl.job.core.util.FileUtil;
import freemarker.cache.FileTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateExceptionHandler;
public class GenerateHtmlContextUtil<T> {
/**
* 本地临时地址
*/
private static String TEMP_PATCH;
/**
* ftl模板地址
*/
private static String TEMPLATE_FTL_PATH;
/**
* 是否需要删除临时生成的html文件
*/
private Boolean NEED_DELETE_HTML = true;
private T data;
private static Configuration CONFIG = new Configuration(Configuration.getVersion());
public final static String SUFFIX_FTL = ".ftl";
public final static String SUFFIX_HTML = ".html";
/**
* 设置模板地址和临时文件地址
* @param uploadPatch
* @param templateFtlPath
* @param needDeleteHtml 是否需要删除生成的 html文件
*/
public GenerateHtmlContextUtil(String uploadPatch,String templateFtlPath,boolean needDeleteHtml) {
TEMP_PATCH = uploadPatch;
TEMPLATE_FTL_PATH = templateFtlPath;
NEED_DELETE_HTML = needDeleteHtml;
}
/**
* 构建静态html
**
* @description:
* @author: liuql
* @date: 2024/4/8
* @param fileName 不包括后缀名
*
*/
public void buildStaticHtml(T data, String fileName) throws Exception {
Map<String, Object> map = new HashMap<>(32);
map.put("templateFtlPath", TEMPLATE_FTL_PATH);
map.put("name", fileName);
map.put("data", data);
/// 放入文件后缀名
map.put("suffix", SUFFIX_HTML);
/// 生成静态html
writerStaticFile(map);
}
/**
* 页面静态化方法
*
* @param map 页面元素
* @throws Exception
*/
public void writerStaticFile(Map<String, Object> map) throws Exception {
//静态化
File file = new File(TEMPLATE_FTL_PATH);
File parentDirectory = file.getParentFile();
CONFIG.setTemplateExceptionHandler(TemplateExceptionHandler.HTML_DEBUG_HANDLER);
FileTemplateLoader templateLoader=new FileTemplateLoader(new File(parentDirectory.getAbsolutePath()));
CONFIG.setTemplateLoader(templateLoader);
//获取模板
Template temple = CONFIG.getTemplate(file.getName());
//生成最终页面并写到文件
Writer out = new OutputStreamWriter(new FileOutputStream(
TEMP_PATCH + File.separator + map.get("name") + map.get("suffix")));
try {
//处理
temple.process(map, out);
} catch (TemplateException e) {
e.printStackTrace();
} finally {
out.close();
}
}
/**
* 读取静态html页面
*
* @param fileName 名称
* @return staticHtml.toString() 静态页面html字符串
*/
public String generateStaticHtml(String fileName) {
StringBuilder staticHtml = new StringBuilder(2048);
try {
FileReader fr = new FileReader(TEMP_PATCH + File.separator + fileName +SUFFIX_HTML );
BufferedReader br = new BufferedReader(fr);
String content = "";
while ((content = br.readLine()) != null) {
staticHtml.append(content);
}
} catch (Exception e) {
return "";
}
if (NEED_DELETE_HTML){
FileUtil.deleteFile(TEMP_PATCH + File.separator + fileName +SUFFIX_HTML);
}
return staticHtml.toString();
}
}
代码示例
GenerateHtmlContextUtil<Map<String ,Object>> generateHtmlContextUtil = new GenerateHtmlContextUtil<>(tempPath,templateFtlPath,false);
// "hhh" 是临时生成的 html文件名
generateHtmlContextUtil.buildStaticHtml(dataMap,"hhh");
String htmlString = generateHtmlContextUtil.generateStaticHtml("hhh").toString();
dataMap 的结构
这里要非常小心，如果字段取不到是会报错的。
