[英]How get file from POST request in CycleJS
我写了一个Spring控制器,它在请求中接受json并响应pdf文件。
public ResponseEntity<byte[]> generateResp(...)
byte[] gMapRep = Files.readAllBytes(file.toPath());
HttpHeaders httpHeaders = new HttpHeaders();
httpHeaders.setContentType(MediaType.parseMediaType("application/pdf"));
httpHeaders.setContentDispositionFormData("content-disposition", "filename=report.pdf");
httpHeaders.setCacheControl("must-relative, post-check=0, pre-check=0");
return ResponseEntity
.ok()
.headers(httpHeaders)
.body(gMapRep);
在Postman上运行良好。 由于我需要发送一些参数,因此在POST方法上是必需的。 但是如何从响应中获取/下载CycleJS中的pdf文件。 我在前端尝试过:
const buttonRequest$ = actions.buttonClick$
.withLatestFrom(sources.arcgisDriver.onMapLoaded,
(ev, _)=> {
return {
url: myURL,
method: 'POST',
type: 'application/json',
send: data
}
});
sources.HTTP
.filter(response => {
return !response.error && response.request.url.includes(myURL)
})
.subscribe(resp => window.open("data:application/pdf;base64, " + resp.text, '', 'height=650,width=840'));
这是一个使用RxJS示例的客户端 Cycle.js , 它从( 模拟的 )API中获取值,然后单击按钮以填充隐藏的表单,然后将该表单提交到服务器脚本中,该脚本返回指向新浏览器窗口的PDF文档或标签:
import Rx from 'rx';
import Cycle from '@cycle/core';
import {div, form, input, button, makeDOMDriver} from '@cycle/dom';
function makeFormDriver (formid, elemid) {
return function (post$) {
post$.subscribeOnNext(function (post) {
document.querySelector(elemid).value = post;
document.querySelector(formid).submit();
});
}
}
function main({DOM}) {
const buttonClick$ = DOM.select('button#pdf').events('click');
const api$ = Rx.Observable.of('test.pdf'); // mocked API
const post$ = buttonClick$.withLatestFrom(api$, (bclick, file) => file);
const vdom$ = Rx.Observable.of(
div([
form('#pdfform', {
method: 'post', action: 'http://localhost:3000/file',
target: '_blank', style: 'display: none;'
}, [input(#filename', {type: 'hidden', name: 'filename'})]),
button('#pdf', 'PDF')
])
);
return {
DOM: vdom$,
FORM: post$
};
}
Cycle.run(main, {
DOM: CycleDOM.makeDOMDriver('#app'),
FORM: makeFormDriver('#pdfform', '#filename')
});
这是一个使用xstream示例的客户端 Cycle.js :
import xs from 'xstream';
import Cycle from '@cycle/xstream-run';
import {div, form, input, button, makeDOMDriver} from '@cycle/dom';
function makeFormDriver (formId, elemId) {
const form = document.querySelector(formId);
const elem = document.querySelector(elemId);
return function (post$) {
post$.addListener({
next: function (post) {
elem.value = post; // populate form data
form.submit(); // submit form
},
error: function () {},
complete: function () {}
});
}
}
function main(sources) {
const buttonclick$ = sources.DOM.select('#pdfbutton').events('click');
const api$ = xs.of('test.pdf'); // mocked API
const post$ = buttonclick$.map(bclick => api$).flatten(); // ~ withLatestFrom
let vtree$ = xs.of(
div('.pdf', [
form('#pdfform', {attrs: {
method: 'post', action: '/file',
target: '_blank', style: 'display: none;' // new tab and hide form
}}, [
input('#filename', {attrs: {name: 'filename', type: 'input'}}),
]),
button('#pdfbutton', 'view pdf')
])
)
return {
DOM: vtree$,
FORM: post$
};
}
Cycle.run(main, {
DOM: makeDOMDriver('.app-container'),
FORM: makeFormDriver('#pdfform', '#filename')
});
而且, 下面是使用Express的服务器端 Cycle.js和xstream示例, 该示例接收POST的数据并返回指定的文档:
import xs from 'xstream';
import Cycle from '@cycle/xstream-run';
import express from 'express';
import bodyParser from 'body-parser';
let server = express();
server.use(bodyParser.urlencoded({ extended: false }))
function makeDownloadDriver (effect) {
return function (postfile$) {
let file$ = postfile$.map(body => body.filename)
file$.addListener({
next: effect,
error: function () {},
complete: function () {}
})
}
}
server.use(function (req, res) {
let postfile$ = xs.of(req)
.filter(req => 'POST' === req.method && '/file' === req.url)
.map(req => req.body);
function main (sources) {
return {
postfile: postfile$
};
}
Cycle.run(main, {
postfile: makeDownloadDriver(file => res.sendFile(file, {root: __dirname})),
});
});
server.listen(3000);
要查看它们与页面路由器一起工作,请查看cycle-isomorphic-file-download 。
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