本文实例讲述了nodejs导出excel的方法。分享给大家供大家参考。具体如下：
nodejs 对查询数据生成excel并下载，采用方式先生成本excel文件，然后再下载；通过比较采用excel-export插件代码如下：
excel.js代码：
var extend = require("extend"); var fs = require("fs"); var excelExport = require('excel-export'); var guid=require('guid'); var path=require('path'); var excel=function(){ this.req=null; this.resp=null; }; /** * 生成excel文件 * @param params */ excel.prototype.createExcel=function(params){ var setting={savePath:"uploadFile/excel/"}; setting=extend({},setting,params); var uuid=guid.create(); var data=params.data||""; var result = excelExport.execute(data); var name='excel'+uuid+'.xlsx'; var filePath= path.resolve(setting.savePath, name); fs.writeFile(filePath, result, 'binary',function(err){ setting.cb(filePath); }); } /** * 计算上次的断点信息 * @param range * @returns {number} * @private */ excel.prototype._calStartPosition = function(range) { var startPos = 0; if( typeof range != 'undefined') { var startPosMatch = /^bytes=([0-9]+)-$/.exec(range); startPos = Number(startPosMatch[1]); } return startPos; } excel.prototype._configHeader = function(config) { var startPos = config.startPos, fileSize = config.fileSize, resp = this.resp; // 如果startPos为0，表示文件从0开始下载的，否则则表示是断点下载的。 if(startPos == 0) { resp.setHeader('Accept-Range', 'bytes'); } else { resp.setHeader('Content-Range', 'bytes ' + startPos + '-' + (fileSize - 1) + '/' + fileSize); } resp.writeHead(206, 'Partial Content', { 'Content-Type' : 'application/octet-stream' }); } excel.prototype._init = function(filePath, down) { var config = {}; var self = this; fs.stat(filePath, function(error, state) { if(error) throw error; config.fileSize = state.size; var range = self.req.headers.range; config.startPos = self._calStartPosition(range); self.config = config; self._configHeader(config); down(); }); } /** * 下载文件 * @param filePath 文件路径 * @param req * @param res * @param isDeleted 下载完成后是否删除文件，true删除 */ excel.prototype.download = function(filePath,req,res,isDeleted) { var self = this; self.req=req; self.resp = res; path.exists(filePath, function(exist) { if(exist) { self._init(filePath, function() { var config = self.config resp = self.resp; fReadStream = fs.createReadStream(filePath, { encoding : 'binary', bufferSize : 1024 * 1024, start : config.startPos, end : config.fileSize }); fReadStream.on('data', function(chunk) { resp.write(chunk, 'binary'); }); fReadStream.on('end', function() { //是否删除文件 if(isDeleted) { fs.unlink(filePath, function (err, res) { }); } resp.end(); }); }); } else { console.log('文件不存在！'); return; } }); } module.exports=new excel();
调用方式：
var excel=require('../lib/excelHelper.js'); exports.exportExcel=function(req,res){ var conf ={}; conf.cols = [ {caption:'string', type:'string'}, {caption:'date', type:'string'}, {caption:'bool', type:'bool'}, {caption:'number', type:'number'} ]; conf.rows = [ ['pi', '2015-06-29', true, 3.14], ["e", '2015-06-29', false, 2.7182] ]; var filename ="导出excel.xlsx"; res.setHeader('Content-Disposition', 'attachment; filename='+encodeURIComponent(filename)); excel.createExcel({ data:conf, savePath:"uploadFile/excel/", cb:function(path){ excel.download(path,req, res,true); } }); }
希望本文所述对大家的nodejs程序设计有所帮助。
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