java 邮件发送表格

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

在这里插入图片描述
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
在这里插入图片描述

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 blocke.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sheetfor(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nullcontinue;}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nullsb.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htmlwriterStaticFile(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();