用的是koa2框架，但好好处理一下，用express框架也是可以的。导出的Excel是xlsx的格式，解析导入Excel的有xlsx和csv格式。通常导入Excel是要上传的，然后获取文件的路径，这里省略。强烈不建议导入的Excel直接保存到数据库，建议将数据发到页面上确认没问题，再保存，防止导入垃圾数据。导入的Excel里也不要什么样式，防止不符合解析规范。建议用xlsx格式的Excel导入，解析比较简单。
最后用Buffer导出Excel输出，参考了：https://blog.csdn.net/zhangfei8625/article/details/51802166
我的Excel内容
index.html 的代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Excel的导入导出</title>
<script src="https://code.jquery.com/jquery-1.12.4.min.js"
integrity="sha256-ZosEbRLbNQzLpnKIkEdrPv7lOy9C27hHQ+Xp8a4MxAQ="
crossorigin="anonymous">
</script>
</head>
<body>
<hr/>
导出Excel：<button id="exportexcel">提交</button>
<hr/>
导入xlsx格式：<button id="importexcelxlsx">提交</button>
<hr/>
导入csv格式：<button id="importexcecsv">提交</button>
<script>
$(function () {
$("#exportexcel").on("click",function () {
window.open("/exportexcel")
});
$("#importexcelxlsx").on("click",function () {
$.ajax({
url : "/importexcelxlsx",
type : "POST",
data : {},
success : function(data){
console.log(data);
}
});
});
$("#importexcecsv").on("click",function () {
$.ajax({
url : "/importexcelcsv",
type : "POST",
data : {},
success : function(data){
console.log(data);
}
});
});
})
</script>
</body>
</html>
app.js 的代码
const Koa = require("koa");
const router = require("koa-router")();
const fs=require("fs");
const nodeExcel = require('excel-export');
const csv=require('csv');
const dict = require('gbk-dict').init();//调用gbk-dict中的init这个方法
const xlsx = require('node-xlsx');
const app = new Koa();
app.use(router.routes());
router.get("/",(ctx)=>{
ctx.body = fs.readFileSync("./index.html","utf-8");
});
//导出Excel，xlsx格式
router.get('/exportexcel',async (ctx) => {
async function readydata() {
//做点什么，如从数据库取数据
let exceldata=[
{name:"张三",age:"20",sex:"男",birthday:"1998-10-10"},
{name:"李四",age:"21",sex:"男",birthday:"1997-08-08"},
{name:"王五",age:"22",sex:"男",birthday:"1996-06-06"},
{name:"赵六",age:"20",sex:"男",birthday:"1998-12-12"},
];
return exceldata;
}
//导出
async function exportdata(v) {
let conf ={};
conf.name = "mysheet";//表格名
let alldata = new Array();
for(let i = 0;i<v.length;i++){
let arr = new Array();
arr.push(v[i].name);
arr.push(v[i].age);
arr.push(v[i].sex);
arr.push(v[i].birthday);
alldata.push(arr);
}
//决定列名和类型
conf.cols = [{
caption:'姓名',
type:'string'
},{
caption:'年龄',
type:'number'
},{
caption:'性别',
type:'string'
},{
caption:'出生日期',
type:'string',
//width:280
}];
conf.rows = alldata;//填充数据
let result = nodeExcel.execute(conf);
//最后3行express框架是这样写
// res.setHeader('Content-Type', 'application/vnd.openxmlformats');
// res.setHeader("Content-Disposition", "attachment; filename=" + "Report.xlsx");
// res.end(result, 'binary');
let data = new Buffer(result,'binary');
ctx.set('Content-Type', 'application/vnd.openxmlformats');
ctx.set("Content-Disposition", "attachment; filename=" + "Report.xlsx");
ctx.body=data;
}
let r=await readydata();
r=await exportdata(r);
});
//导入Excel，xlsx格式
const xlsxfile="E:/xlsx格式.xlsx";
router.post('/importexcelxlsx',async (ctx) => {
async function analysisdata() {
return new Promise((resolve,reject)=>{
//解析xlsx
let obj = xlsx.parse(xlsxfile);
resolve(obj);
});
}
async function readdata(v) {
console.log("xlsx =" ,v);//xlsx = [ { name: 'Sheet1', data: [ [Array], [Array], [Array] ] } ]
console.log("数据 = ",v[0]);//数据 = { name: 'Sheet1',
// data: [ [ '姓名', '年龄' ], [ '张三', 20 ], [ '李四', 30 ] ]}
console.log("要上传的数据 = ",v[0].data);//要上传的数据 = [ [ '姓名', '年龄' ], [ '张三', 20 ], [ '李四', 30 ] ]
ctx.body=v;
}
let r=await analysisdata();
r=await readdata(r);
});
//导入Excel，csv格式
const csvfile="E:/csv格式.csv";
router.post('/importexcelcsv',async (ctx) => {
async function analysisdata() {
return new Promise((resolve,reject)=>{
//解析csv
let output = new Array();//创建数组
let parser = csv.parse({delimiter: ','});//调用csv模块的parse方法
let input = fs.createReadStream(csvfile);//调用fs模块的createReadStream方法
input.on("data",function(data){
parser.write(dict.gbkToUTF8(data));
});
input.on("close",function(){
parser.end();
});//读取操作的缓存装不下，只能分成几次发送，每次发送会触发一个data事件，发送结束会触发end事件
parser.on('readable',function(){
while(record = parser.read()){
output.push(record);
}
});
parser.on('finish',function() {
resolve(output); ;
//output是整个数据的数组
})
});
}
async function readdata(v) {
console.log("csv =" ,v);//csv = [ [ '姓名', '年龄' ], [ '张三', '20' ], [ '李四', '30' ] ]
ctx.body=v;
}
let r=await analysisdata();
r=await readdata(r);
});
app.listen(3000);
console.log("listen on 3000");
导出的Excel