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。。