利用Extjs导出excel文件（转）

最近在做一个项目，需要在原先的表格的基础上导出excel文件，原先是想用java后台来实现这个功能，但是，后来发现，原来extjs也附带有导出excel表的功能，就在GridPanel的基础上导出，http://www.blogjava.net/rockblue1988/archive/2012/02/29/370977.html，这是我做的时候，参考的一篇网上的文章。具体的做法是，将extjsGridPanel里面的数据拿出来，转换成xml,然后发送给后台，后台响应之后，将数据输出为Excel的格式，具体代码如下。

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//利用extjs导出excel文件---begin
    function exportExcel(gridpanel) { //传入的GridPanel的实例
                                var vExportContent = gridpanel.getExcelXml(); //获取数据
                            if (Ext.isIE8||Ext.isIE6 || Ext.isIE7 || Ext.isSafari
                                    || Ext.isSafari2 || Ext.isSafari3) { //判断浏览器
 
                                var fd = Ext.get('frmDummy');
                                if (!fd) {
                                    fd = Ext.DomHelper.append(
                                            Ext.getBody(), {
                                                tag : 'form',
                                                method : 'post',
                                                id : 'frmDummy',
                                                action : exportExcelGrid,
                                                target : '_blank',
                                                name : 'frmDummy',
                                                cls : 'x-hidden',
                                                cn : [ {
                                                    tag : 'input',
                                                    name : 'exportContent',
                                                    id : 'exportContent',
                                                    type : 'hidden'
                                                } ]
                                            }, true);
                                     
                                }
                                fd.child('#exportContent').set( {
                                    value : vExportContent
                                });
                                fd.dom.submit();
                            } else {
                                document.location = 'data:application/vnd.ms-excel;base64,' + Base64
                                        .encode(vExportContent);
                            }
                        }
     
     
//利用extjs导出excel文件---end

　　除此之外，还要引入一个文件

/**
 * allows for downloading of grid data (store) directly into excel
 * Method: extracts data of gridPanel store, uses columnModel to construct XML excel document,
 * converts to Base64, then loads everything into a data URL link.
 *
 * @author      Animal      <extjs support team>
 *
 */
 
/**
 * base64 encode / decode
 *
 * @location    http://www.webtoolkit.info/
 *
 */
 
var Base64 = (function() {
    // Private property
    var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 
    // Private method for UTF-8 encoding
    function utf8Encode(string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }
        return utftext;
    }
 
    // Public method for encoding
    return {
        encode : (typeof btoa == 'function') ? function(input) {
            return btoa(utf8Encode(input));
        } : function (input) {
            var output = "";
            var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
            var i = 0;
            input = utf8Encode(input);
            while (i < input.length) {
                chr1 = input.charCodeAt(i++);
                chr2 = input.charCodeAt(i++);
                chr3 = input.charCodeAt(i++);
                enc1 = chr1 >> 2;
                enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
                enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
                enc4 = chr3 & 63;
                if (isNaN(chr2)) {
                    enc3 = enc4 = 64;
                } else if (isNaN(chr3)) {
                    enc4 = 64;
                }
                output = output +
                keyStr.charAt(enc1) + keyStr.charAt(enc2) +
                keyStr.charAt(enc3) + keyStr.charAt(enc4);
            }
            return output;
        }
    };
})();
 
Ext.override(Ext.grid.GridPanel, {
    getExcelXml: function(includeHidden) {
        var worksheet = this.createWorksheet(includeHidden);
        var totalWidth = this.getColumnModel().getTotalWidth(includeHidden);
        return '<xml version="1.0" encoding="utf-8">' +
            '<ss:Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:o="urn:schemas-microsoft-com:office:office">' +
            '<o:DocumentProperties><o:Title>' + this.title + '</o:Title></o:DocumentProperties>' +
            '<ss:ExcelWorkbook>' +
            '<ss:WindowHeight>' + worksheet.height + '</ss:WindowHeight>' +
            '<ss:WindowWidth>' + worksheet.width + '</ss:WindowWidth>' +
            '<ss:ProtectStructure>False</ss:ProtectStructure>' +
            '<ss:ProtectWindows>False</ss:ProtectWindows>' +
            '</ss:ExcelWorkbook>' +
            '<ss:Styles>' +
            '<ss:Style ss:ID="Default">' +
            '<ss:Alignment ss:Vertical="Top" ss:WrapText="1" />' +
            '<ss:Font ss:FontName="arial" ss:Size="10" />' +
            '<ss:Borders>' +
            '<ss:Border ss:Color="#e4e4e4" ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Top" />' +
            '<ss:Border ss:Color="#e4e4e4" ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Bottom" />' +
            '<ss:Border ss:Color="#e4e4e4" ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Left" />' +
            '<ss:Border ss:Color="#e4e4e4" ss:Weight="1" ss:LineStyle="Continuous" ss:Position="Right" />' +
            '</ss:Borders>' +
            '<ss:Interior />' +
            '<ss:NumberFormat />' +
            '<ss:Protection />' +
            '</ss:Style>' +
            '<ss:Style ss:ID="title">' +
            '<ss:Borders />' +
            '<ss:Font />' +
            '<ss:Alignment ss:WrapText="1" ss:Vertical="Center" ss:Horizontal="Center" />' +
            '<ss:NumberFormat ss:Format="@" />' +
            '</ss:Style>' +
            '<ss:Style ss:ID="headercell">' +
            '<ss:Font ss:Bold="1" ss:Size="10" />' +
            '<ss:Alignment ss:WrapText="1" ss:Horizontal="Center" />' +
            '<ss:Interior ss:Pattern="Solid" ss:Color="#A3C9F1" />' +
            '</ss:Style>' +
            '<ss:Style ss:ID="even">' +
            '<ss:Interior ss:Pattern="Solid" ss:Color="#CCFFFF" />' +
            '</ss:Style>' +
            '<ss:Style ss:Parent="even" ss:ID="evendate">' +
            '<ss:NumberFormat ss:Format="yyyy-mm-dd" />' +
            '</ss:Style>' +
            '<ss:Style ss:Parent="even" ss:ID="evenint">' +
            '<ss:NumberFormat ss:Format="0" />' +
            '</ss:Style>' +
            '<ss:Style ss:Parent="even" ss:ID="evenfloat">' +
            '<ss:NumberFormat ss:Format="0.00" />' +
            '</ss:Style>' +
            '<ss:Style ss:ID="odd">' +
            '<ss:Interior ss:Pattern="Solid" ss:Color="#CCCCFF" />' +
            '</ss:Style>' +
            '<ss:Style ss:Parent="odd" ss:ID="odddate">' +
            '<ss:NumberFormat ss:Format="yyyy-mm-dd" />' +
            '</ss:Style>' +
            '<ss:Style ss:Parent="odd" ss:ID="oddint">' +
            '<ss:NumberFormat ss:Format="0" />' +
            '</ss:Style>' +
            '<ss:Style ss:Parent="odd" ss:ID="oddfloat">' +
            '<ss:NumberFormat ss:Format="0.00" />' +
            '</ss:Style>' +
            '</ss:Styles>' +
            worksheet.xml +
            '</ss:Workbook>';
    },
 
    createWorksheet: function(includeHidden) {
        // Calculate cell data types and extra class names which affect formatting
        var cellType = [];
        var cellTypeClass = [];
        var cm = this.getColumnModel();
        var totalWidthInPixels = 0;
        var colXml = '';
        var headerXml = '';
        var visibleColumnCountReduction = 0;
        var colCount = cm.getColumnCount();
        for (var i = 0; i < colCount; i++) {
            if ((cm.getDataIndex(i) != '')
                && (includeHidden || !cm.isHidden(i))) {
                var w = cm.getColumnWidth(i)
                totalWidthInPixels += w;
                if (cm.getColumnHeader(i) === ""){
                    cellType.push("None");
                    cellTypeClass.push("");
                    ++visibleColumnCountReduction;
                }
                else
                {
                    colXml += '<ss:Column ss:AutoFitWidth="1" ss:Width="' + w + '" />';
                    headerXml += '<ss:Cell ss:StyleID="headercell">' +
                        '<ss:Data ss:Type="String">' + cm.getColumnHeader(i) + '</ss:Data>' +
                        '<ss:NamedCell ss:Name="Print_Titles" /></ss:Cell>';
                    var fld = this.store.recordType.prototype.fields.get(cm.getDataIndex(i));
                    switch(fld.type) {
                        case "int":
                            cellType.push("Number");
                            cellTypeClass.push("int");
                            break;
                        case "float":
                            cellType.push("Number");
                            cellTypeClass.push("float");
                            break;
                        case "bool":
                        case "boolean":
                            cellType.push("String");
                            cellTypeClass.push("");
                            break;
                        case "date":
                            cellType.push("DateTime");
                            cellTypeClass.push("date");
                            break;
                        default:
                            cellType.push("String");
                            cellTypeClass.push("");
                            break;
                    }
                }
            }
        }
        var visibleColumnCount = cellType.length - visibleColumnCountReduction;
 
        var result = {
            height: 9000,
             Math.floor(totalWidthInPixels * 30) + 50
        };
 
        // Generate worksheet header details.
        var t = '<ss:Worksheet ss:Name="' + this.title + '">' +
            '<ss:Names>' +
            '<ss:NamedRange ss:Name="Print_Titles" ss:RefersTo="=\'' + this.title + '\'!R1:R2" />' +
            '</ss:Names>' +
            '<ss:Table x:FullRows="1" x:FullColumns="1"' +
            ' ss:ExpandedColumnCount="' + (visibleColumnCount + 2) +
            '" ss:ExpandedRowCount="' + (this.store.getCount() + 2) + '">' +
            colXml +
            '<ss:Row ss:Height="38">' +
            '<ss:Cell ss:StyleID="title" ss:MergeAcross="' + (visibleColumnCount - 1) + '">' +
            '<ss:Data xmlns:html="http://www.w3.org/TR/REC-html40" ss:Type="String">' +
            '<html:B></html:B></ss:Data><ss:NamedCell ss:Name="Print_Titles" />' +
            '</ss:Cell>' +
            '</ss:Row>' +
            '<ss:Row ss:AutoFitHeight="1">' +
            headerXml +
            '</ss:Row>';
 
        // Generate the data rows from the data in the Store
        for (var i = 0, it = this.store.data.items, l = it.length; i < l; i++) {
            t += '<ss:Row>';
            var cellClass = (i & 1) ? 'odd' : 'even';
            r = it[i].data;
            var k = 0;
            for (var j = 0; j < colCount; j++) {
                if ((cm.getDataIndex(j) != '')
                    && (includeHidden || !cm.isHidden(j))) {
                    var v = r[cm.getDataIndex(j)];
                    if (cellType[k] !== "None") {
                        t += '<ss:Cell ss:StyleID="' + cellClass + cellTypeClass[k] + '"><ss:Data ss:Type="' + cellType[k] + '">';
                        if (cellType[k] == 'DateTime') {
                            t += v.format('Y-m-d');
                        } else {
                            t += v;
                        }
                        t +='</ss:Data></ss:Cell>';
                    }
                    k++;
                }
            }
            t += '</ss:Row>';
        }
 
        result.xml = t + '</ss:Table>' +
            '<x:WorksheetOptions>' +
            '<x:PageSetup>' +
            '<x:Layout x:CenterHorizontal="1" x:Orientation="Landscape" />' +
            '<x:Footer x:Data="Page &P of &N" x:Margin="0.5" />' +
            '<x:PageMargins x:Top="0.5" x:Right="0.5" x:Left="0.5" x:Bottom="0.8" />' +
            '</x:PageSetup>' +
            '<x:FitToPage />' +
            '<x:Print>' +
            '<x:PrintErrors>Blank</x:PrintErrors>' +
            '<x:FitWidth>1</x:FitWidth>' +
            '<x:FitHeight>32767</x:FitHeight>' +
            '<x:ValidPrinterInfo />' +
            '<x:VerticalResolution>600</x:VerticalResolution>' +
            '</x:Print>' +
            '<x:Selected />' +
            '<x:DoNotDisplayGridlines />' +
            '<x:ProtectObjects>False</x:ProtectObjects>' +
            '<x:ProtectScenarios>False</x:ProtectScenarios>' +
            '</x:WorksheetOptions>' +
            '</ss:Worksheet>';
        return result;
    }
});

　　之后，后台的代码就比较简单了，以下是在strut2下写的。

logger.info("导出excel记录");
     
        ActionContext context = ActionContext.getContext();
        HttpServletRequest request = (HttpServletRequest) context
                .get(ServletActionContext.HTTP_REQUEST);
        HttpServletResponse response = (HttpServletResponse) context
                .get(ServletActionContext.HTTP_RESPONSE);
        PrintWriter out;
        try {
            out = response.getWriter();
            response.setHeader("Content-Type","application/force-download");
            response.setHeader("Content-Type","application/vnd.ms-excel");
            response.setHeader("Content-Disposition","attachment;filename=export.xls");
            out.print(request.getParameter("exportContent"));
 
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
 
        return null;
 
    }

　　这样一来，就可以实现利用js导出excel文件了。。

http://blog.chinaunix.net/uid-26884465-id-3481113.html 参照原文