Javascript 如何在CycleJS中从POST请求获取文件
我已经编写了一个Spring控制器,它在请求中接受json并响应pdf文件Javascript 如何在CycleJS中从POST请求获取文件,javascript,rxjs,cyclejs,Javascript,Rxjs,Cyclejs,我已经编写了一个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(Medi
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);
下面是一个客户端使用示例,从(模拟的)API中获取值,点击按钮填充隐藏表单,然后将表单提交到服务器脚本,该脚本返回一个PDF文档,该文档被定向到新的浏览器窗口或选项卡:
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')
});
下面是一个客户端使用示例:
下面是一个服务器端的例子,使用接收发布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);
要查看这些与页面路由器一起工作,请签出。我已尝试使用window.open()获取响应和订阅响应,但它不工作。我还尝试添加数据:application/pdf,+response.text,它会打开pdf文件,但这里的解析pdf文件有问题。你能发布你的前端代码吗?很难仅仅从XHR(Ajax)的描述就看出哪里出了问题。有必要使用XHR吗?或者你可以简单地通过HTTP发布序列化的JSON数据吗?不,我认为在这种情况下没有必要这样做。HTTP POST我只需要发送对于构建pdf非常重要的数据。
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')
});
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);