Jsp中的table多表头导出excel文件具体实现

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

/*
 *  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[ta