import React from "react";

import ReactDOM from ‘react-dom‘

import * as XLSX from ‘xlsx‘;

import {Button, message, Table,Upload} from ‘antd‘;

import ExportJsonExcel from ‘js-export-excel‘;

import ‘antd/dist/antd.css‘;

const Dragger = Upload.Dragger;

class Index extends React.Component {

    constructor(props) {

        super(props);

        this.state = {

            dataSource: [],//表格内容

            columns: [],//表格头部

            data:[]//excel数据

        };

    }

    uploadFilesChange(file) {

        // 通过FileReader对象读取文件

        const fileReader = new FileReader();

        fileReader.readAsBinaryString(file.file);

        fileReader.onload = event => {

            try {

                const { result } = event.target;

                // 以二进制流方式读取得到整份excel表格对象

                const workbook = XLSX.read(result, { type: ‘binary‘ });

                console.log(workbook)

                // 存储获取到的数据

                let data = {

                    

                };

                // 遍历每张工作表进行读取（这里默认只读取第一张表）

                for (const sheet in workbook.Sheets) {

                    let tempData = [];

                    // esline-disable-next-line

                    // console.log(workbook.Sheets[sheet])

                    if (workbook.Sheets.hasOwnProperty(sheet)) {

                        console.log(sheet)

                        // 利用 sheet_to_json 方法将 excel 转成 json 数据

                        data[sheet] = tempData.concat(XLSX.utils.sheet_to_json(workbook.Sheets[sheet]));

                    }

                }

                console.log(data)

                //上传成功啦,data为上传后的数据

                this.setState({

                    data:data.Sheet1

                });

                // 最终获取到并且格式化后的 json 数据

                message.success(‘上传成功！‘)

                

            } catch (e) {

                // 这里可以抛出文件类型错误不正确的相关提示

                message.error(‘文件类型不正确！‘);

            }

            

            let columns = [];

            let dataSource = [];

            let keys = Object.keys(this.state.data[0]);

            columns = keys.map((item,index)=>{

                return {

                    title:item,

                    dataIndex:item,

                    key:item

                }

            });

           

            dataSource = this.state.data.map((item,index)=>{

                    return {

                        key:index.toString(),

                        "规则协议":item["规则协议"],

                        "端口":item["端口"],

                        "来源":item["来源"],

                        "策略":item["策略"],

                        "备注":item["备注"],

                        "修改时间":item["修改时间"]

                    }

    

            })

            this.setState({

                columns,

                dataSource,

            })

        };

        // 以二进制方式打开文件

    }

    render() {

        const {columns,dataSource} = this.state

        return (

            <div>

                <Dragger name="file"

                         beforeUpload={function () {

                             return false;

                         }}

                         onChange={this.uploadFilesChange.bind(this)}

                         showUploadList={false}>

                    <p className="ant-upload-text">

                        <span>点击上传文件</span>

                        或者拖拽上传

                    </p>

                </Dragger>

                123131

                <Button type="primary" onClick={this.downloadFileToExcel} style={{ marginBottom: "15px" }}>下载</Button>

                <Table columns={columns} dataSource={dataSource}/>

            </div>

        );

    }

}

ReactDOM.render(<Index/>,document.getElementById(‘root‘))