Jsp中的table多表头导出excel文件具体实现

Shun

首先引入两份JS:copyhtmltoexcel.js以及 tableToExcel.js

/* 
 * 默认转换实现函数，如果需要其他功能，需自行扩展
 * 参数：
 *    tableID : HTML中Table对象id属性值
 * 详细用法参见以下 TableToExcel 对象定义  
 */
function saveAsExcel(tableID){
 var tb = new TableToExcel(tableID);
  tb.setFontStyle("Courier New");
  tb.setFontSize(10);
  tb.setTableBorder(2);
  tb.setColumnWidth(7);
  tb.isLineWrap(false);
  tb.isAutoFit(true);
  tb.getExcelFile();
}
/*
 *  功能：HTML中Table对象转换为Excel通用对象.
 *  作者：Jeva
 *  时间：2006-08-09
 *  参数：tableID  HTML中Table对象的ID属性值
 *  说明：
 *     能适应复杂的HTML中Table对象的自动转换，能够自动根据行列扩展信息
 *     合并Excel中的单元格，客户端需要安装有Excel
 *     详细的属性、方法引用说明参见：Excel的Microsoft Excel Visual Basic参考
 *  示范：
 *     var tb = new TableToExcel('demoTable');
 *  tb.setFontStyle("Courier New");
 *  tb.setFontSize(10);  //推荐取值10
 *  tb.setFontColor(6);  //一般情况不用设置
 *  tb.setBackGround(4);  //一般情况不用设置
 *  tb.setTableBorder(2);  //推荐取值2
 *  tb.setColumnWidth(10);  //推荐取值10
 *  tb.isLineWrap(false);
 *  tb.isAutoFit(true);
 *  
 *  tb.getExcelFile();
 *   如果设置了单元格自适应，则设置单元格宽度无效
 *  版本：1.0
 */
function TableToExcel(tableID) {
  this.tableBorder = -1; //边框类型，-1没有边框 可取1/2/3/4
  this.backGround = 0; //背景颜色：白色   可取调色板中的颜色编号 1/2/3/4....
  this.fontColor = 1;  //字体颜色：黑色
  this.fontSize = 10;  //字体大小
  this.fontStyle = "宋体"; //字体类型
  this.rowHeight = -1; //行高
  this.columnWidth = -1; //列宽
  this.lineWrap = true; //是否自动换行
  this.textAlign = -4108; //内容对齐方式   默认为居中
  this.autoFit = false;  //是否自适应宽度
  this.tableID = tableID; 
}
TableToExcel.prototype.setTableBorder = function (excelBorder) {
  this.tableBorder = excelBorder ;
};
TableToExcel.prototype.setBackGround = function (excelColor) {
  this.backGround = excelColor;
};
TableToExcel.prototype.setFontColor = function (excelColor) {
  this.fontColor = excelColor;
};
TableToExcel.prototype.setFontSize = function (excelFontSize) {
  this.fontSize = excelFontSize;
};
TableToExcel.prototype.setFontStyle = function (excelFont) {
  this.fontStyle = excelFont;
};
TableToExcel.prototype.setRowHeight = function (excelRowHeight) {
  this.rowHeight = excelRowHeight;
};
TableToExcel.prototype.setColumnWidth = function (excelColumnWidth) {
  this.columnWidth = excelColumnWidth;
};
TableToExcel.prototype.isLineWrap = function (lineWrap) {
  if (lineWrap == false || lineWrap == true) {
    this.lineWrap = lineWrap;
  }
};
TableToExcel.prototype.setTextAlign = function (textAlign) {
  this.textAlign = textAlign;
};
TableToExcel.prototype.isAutoFit = function(autoFit){
 if(autoFit == true || autoFit == false)
  this.autoFit = autoFit ;
}
//文件转换主函数
TableToExcel.prototype.getExcelFile = function () {
  var jXls, myWorkbook, myWorksheet, myHTMLTableCell, myExcelCell, myExcelCell2;
  var myCellColSpan, myCellRowSpan;
  try {
    jXls = new ActiveXObject('Excel.Application');
  }
  catch (e) {
    alert("无法启动Excel!\n\n" + e.message + 
       "\n\n如果您确信您的电脑中已经安装了Excel，"+
       "那么请调整IE的安全级别。\n\n具体操作：\n\n"+
       "工具 → Internet选项 → 安全 → 自定义级别 → ActiveX控件和插件 \n\n" +
     "→ 启用 : 对没有标记为安全的ActiveX控件进行初始化和脚本运行");
    return false;
  }
  jXls.Visible = true;
  myWorkbook = jXls.Workbooks.Add();
  jXls.DisplayAlerts = false;
  myWorkbook.Worksheets(3).Delete();
  myWorkbook.Worksheets(2).Delete();
  jXls.DisplayAlerts = true;
  myWorksheet = myWorkbook.ActiveSheet;
  var  readRow = 0,  readCol = 0;
  var totalRow = 0, totalCol = 0;
  var   tabNum = 0;
//设置行高、列宽
  if(this.columnWidth != -1)
   myWorksheet.Columns.ColumnWidth = this.columnWidth;
  else
   myWorksheet.Columns.ColumnWidth = 7;
  if(this.rowHeight != -1)
   myWorksheet.Rows.RowHeight = this.rowHeight ;
//搜索需要转换的Table对象，获取对应行、列数
  var obj = document.all.tags("table");
  for (x = 0; x < obj.length; x++) {
    if (obj[x].id == this.tableID) {
      tabNum = x;
      totalRow = obj[x].rows.length;
      for (i = 0; i < obj[x].rows[0].cells.length; i++) {
        myHTMLTableCell = obj[x].rows(0).cells(i);
        myCellColSpan = myHTMLTableCell.colSpan;
        totalCol = totalCol + myCellColSpan;
      }
    }
  }
//开始构件模拟表格
  var excelTable = new Array();
  for (i = 0; i <= totalRow; i++) {
    excelTable[i] = new Array();
    for (t = 0; t <= totalCol; t++) {
      excelTable[i][t] = false;
    }
  }
//开始转换表格  
  for (z = 0; z < obj[tabNum].rows.length; z++) {
    readRow = z + 1;
    readCol = 1;
    for (c = 0; c < obj[tabNum].rows(z).cells.length; c++) {
      myHTMLTableCell = obj[tabNum].rows(z).cells(c);
      myCellColSpan = myHTMLTableCell.colSpan;
      myCellRowSpan = myHTMLTableCell.rowSpan;
      for (y = 1; y <= totalCol; y++) {
        if (excelTable[readRow][y] == false) {
          readCol = y;
          break;
        }
      }
      if (myCellColSpan * myCellRowSpan > 1) {
        myExcelCell = myWorksheet.Cells(readRow, readCol);
        myExcelCell2 = myWorksheet.Cells(readRow + myCellRowSpan - 1, readCol + myCellColSpan - 1);
        myWorksheet.Range(myExcelCell, myExcelCell2).Merge();
        myExcelCell.HorizontalAlignment = this.textAlign;
        myExcelCell.Font.Size = this.fontSize;
        myExcelCell.Font.Name = this.fontStyle;
        myExcelCell.wrapText = this.lineWrap;
        myExcelCell.Interior.ColorIndex = this.backGround;
        myExcelCell.Font.ColorIndex = this.fontColor;
        if(this.tableBorder != -1){
         myWorksheet.Range(myExcelCell, myExcelCell2).Borders(1).Weight = this.tableBorder ;
         myWorksheet.Range(myExcelCell, myExcelCell2).Borders(2).Weight = this.tableBorder ;
         myWorksheet.Range(myExcelCell, myExcelCell2).Borders(3).Weight = this.tableBorder ;
         myWorksheet.Range(myExcelCell, myExcelCell2).Borders(4).Weight = this.tableBorder ;
        }
        myExcelCell.Value = myHTMLTableCell.innerText;
        for (row = readRow; row <= myCellRowSpan + readRow - 1; row++) {
          for (col = readCol; col <= myCellColSpan + readCol - 1; col++) {
            excelTable[row][col] = true;
          }
        }
        readCol = readCol + myCellColSpan;
      } else {
        myExcelCell = myWorksheet.Cells(readRow, readCol);
        myExcelCell.Value = myHTMLTableCell.innerText;
        myExcelCell.HorizontalAlignment = this.textAlign;
        myExcelCell.Font.Size = this.fontSize;
        myExcelCell.Font.Name = this.fontStyle;
        myExcelCell.wrapText = this.lineWrap;
        myExcelCell.Interior.ColorIndex = this.backGround;
        myExcelCell.Font.ColorIndex = this.fontColor;
        if(this.tableBorder != -1){
         myExcelCell.Borders(1).Weight = this.tableBorder ;
         myExcelCell.Borders(2).Weight = this.tableBorder ;
         myExcelCell.Borders(3).Weight = this.tableBorder ;
         myExcelCell.Borders(4).Weight = this.tableBorder ;
        }         
        excelTable[readRow][readCol] = true;
        readCol = readCol + 1;
      }
    }
  }
  if(this.autoFit == true)
   myWorksheet.Columns.AutoFit;
  jXls.UserControl = true;
  jXls = null;
  myWorkbook = null;
  myWorksheet = null;
};

copyhtmltoexcel.js

//elTalbeOut 这个为导出内容的外层表格，主要是设置border之类的样式，elDiv则是整个导出的html部分
function onhtmlToExcel(elTableOut,elDiv){
 try{
  //设置导出前的数据，为导出后返回格式而设置
  var elDivStrBak = elDiv.innerHTML;
  //设置table的border=1，这样到excel中就有表格线 ps:感谢双面提醒
  elTableOut.border=1;
  //过滤elDiv内容
  var elDivStr = elDiv.innerHTML;
  elDivStr = replaceHtml(elDivStr,"<A",">");
  elDivStr = replaceHtml(elDivStr,"</A",">");
  elDiv.innerHTML=elDivStr; 
  var oRangeRef = document.body.createTextRange();
  oRangeRef.moveToElementText( elDiv );
  oRangeRef.execCommand("Copy");
  //返回格式变换以前的内容
  elDiv.innerHTML = elDivStrBak;
  //内容数据可能很大，所以赋空
  elDivStrBak = "";
  elDivStr = "";
  var oXL = new ActiveXObject("Excel.Application")
  var oWB = oXL.Workbooks.Add ;
  var oSheet = oWB.ActiveSheet ;
  oSheet.Paste();
  oSheet.Cells.NumberFormatLocal = "@";
  oSheet.Columns("D:D").Select
  oXL.Selection.ColumnWidth = 20
  oXL.Visible = true;  
  oSheet = null;
  oWB = null;
  appExcel = null;
 }catch(e){
  alert(e.description)
 }
}
function replaceHtml(replacedStr,repStr,endStr){   
  var replacedStrF = "";   
  var replacedStrB = "";   
  var repStrIndex = replacedStr.indexOf(repStr);   
  while(repStrIndex != -1){   
    replacedStrF = replacedStr.substring(0,repStrIndex);   
    replacedStrB = replacedStr.substring(repStrIndex,replacedStr.length);   
    replacedStrB = replacedStrB.substring(replacedStrB.indexOf(endStr)+1,replacedStrB.length);   
    replacedStr = replacedStrF + replacedStrB;   
    repStrIndex = replacedStr.indexOf(repStr);   
  }   
  return replacedStr;
}

在JSP页面中写JS方法

//生成Excel
  function onTableToExcel(){
   var elTableOut = document.getElementById("elTableOut");
   var elDiv = document.getElementById("elDiv");
   onhtmlToExcel(elTableOut,elDiv);
  }

注意事项：使用JS导出excel需要设置IE的active。注意最佳的是IE8浏览器。至于在java后台实现excel还没去研究，希望各位大神指教。