Extjs Grid导出表格 功能实现

1、基本原理是：客户端根据Grid数据、使用ExportExcel.js文件生成Excel格式的XML数据，然后发送到一个服务端文件（ExportExcel.jsp），服务端文件通过设定Content-Type来实现Excel的下载。

2、导出Excel按钮代码：

{
text:"导出Excel",
icon : "../images/icon/upload.png",
handler : ExcelExport
}

function ExcelExport() {
var vExportContent = grid.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 : 'ExportExcel.jsp',
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);
}

}

2、ExportExcel.js源码：

var Base64 = (function() {
// Private property
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

// 局部方法中文编码
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;
}

// 公共方法
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;
}
};
})();
//设置xml文件格式
Ext.override(Ext.grid.GridPanel, {
getExcelXml: function(includeHidden) {
var worksheet = this.createWorksheet(includeHidden);
var totalWidth = this.getColumnModel().getTotalWidth(includeHidden);
return '' +
'' +
'' + this.title + '' +
'' +
'' + worksheet.height + '' +
'' + worksheet.width + '' +
'False' +
'False' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
worksheet.xml +
'';
},
//增加Excel工作表
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 += '';
headerXml += '' +
'' + cm.getColumnHeader(i) + '' +
'';
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,
width: Math.floor(totalWidthInPixels * 30) + 50
};

// Generate worksheet header details.
var t = '' +
'' +
'' +
'' +
'' ss:ExpandedColumnCount="' + (visibleColumnCount + 2) +
'" ss:ExpandedRowCount="' + (this.store.getCount() + 2) + '">' +
colXml +
'' +
headerXml +
'';

// 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 += '';
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 += '';
if (cellType[k] == 'DateTime') {
t += v.format('Y-m-d');
} else {
t += v;
}
t +='';
}
k++;
}
}
t += '';
}

result.xml = t + '' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'' +
'Blank' +
'1' +
'32767' +
'' +
'600' +
'' +
'' +
'' +
'False' +
'False' +
'' +
'';
return result;
}
});
3、ExportExcel.jsp源码

<%@ page pageEncoding="UTF-8"%>
<%
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"));
%>