我有一个用户上传GPX文件然后转换为Geojson的表单,我使用mapbox / togeojson模块来实现它,并且我有以下代码:
const togeojson = require ('togeojson')
const jsdom = require('jsdom');
const { JSDOM } = jsdom;
const fs = require ('fs');
const DOMParser = require('xmldom').DOMParser;
const multer = require('multer');
const upload = multer({ dest: 'uploads/' })
module.exports = (express, Courses) => {
var courses_router = express.Router()
courses_router.route('/')
.post(upload.single('gpxFile'),(req, res, next) => {
let file = req.file
if (file) {
console.log("Uploaded : " + file.originalname + " to " + file.path)
fs.readFile(file.path, (err, data) => {
// let gpxJSDOM = new JSDOM(data)
let gpx = new DOMParser().parseFromString(file.path, 'text/xml');
let converted = togeojson.gpx(gpx)
})
}
// var path = utils.ModifyString(req.body.title)
// return false;
// course_container.CreateCourses(Courses, req, res, path)
})
当我记录的结果时converted
,我得到:{ type: 'FeatureCollection', features: [] }
,它看起来像Geojson结构,但没有填充相应的数据(我已经在在线转换器上检查了我的GPX数据是否正确),我也尝试使用JSDOM,如本教程所示,但是没有结果,我猜代码上有一些数据处理错误,但是我不知道在哪里。
找到了答案!我不需要读取文件,我只需要获取上载文件的路径,然后将其传递给new DOMParser()
函数,最后在GeoJson中进行转换即可(而且完全不需要JSDOM)
const course_container = require('./../../containers/CourseContainer');
const utils = require('./../../../utils/functions')
const togeojson = require ('togeojson')
const fs = require ('fs');
const DOMParser = require('xmldom').DOMParser;
const multer = require('multer');
const path = require('path');
const upload = multer({ dest: 'uploads/' })
module.exports = (express, Courses) => {
var courses_router = express.Router()
courses_router.route('/')
.post(upload.single('gpxFile'),(req, res, next) => {
var file = req.file
if (file) {
var absolutePath = path.resolve(file.path);
var gpx = new DOMParser().parseFromString(fs.readFileSync(absolutePath, 'utf8'));
var geoJson = togeojson.gpx(gpx)
}
var course_path = utils.ModifyString(req.body.title)
course_container.CreateCourses(Courses, req, res, course_path, geoJson)
})
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