我正在编写一个后端应用程序，以从客户端接收.jar文件并运行它。以下是客户端代码。
let formData = new FormData();
let req = new XMLHttpRequest();
let file = document.getElementById("filePath").files[0];
formData.append("jarFile", file);
req.open("POST", '/deployArtifact');
req.send(formData);
我需要编写后端端点（节点Red）来获取并运行该文件。以下是nodejs发布端点代码的示意图。
RED.httpAdmin.post("/deployArtifact", RED.auth.needsPermission('MyNode.read'), function (req, res) {
console.log(req.files);
console.log(req);
cmd.get(
'java -jar ' + xxxx,
function (err, data, stderr) {
if (err) {
res.json(err);
} else {
res.json(data);
}
});
});
首先，我需要接收文件对象。我尝试访问req.files，但得到了undefined。我打印了整个要求。以下是传入消息。
IncomingMessage {
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: BufferList { head: null, tail: null, length: 0 },
length: 0,
pipes: null,
pipesCount: 0,
flowing: null,
ended: false,
endEmitted: false,
reading: false,
sync: true,
needReadable: false,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: true,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events: {},
_eventsCount: 0,
_maxListeners: undefined,
socket:
Socket {
connecting: false,
_hadError: false,
_handle:
TCP {
reading: true,
owner: [Circular],
onread: [Function: onread],
onconnection: null,
writeQueueSize: 0,
_consumed: true },
_parent: null,
_host: null,
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: [Object],
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events:
{ end: [Array],
finish: [Function: onSocketFinish],
_socketEnd: [Function: onSocketEnd],
drain: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
error: [Function: socketOnError],
close: [Array],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause] },
_eventsCount: 10,
_maxListeners: undefined,
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 0,
prefinished: false,
errorEmitted: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object] },
writable: true,
allowHalfOpen: true,
_bytesDispatched: 465,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server:
Server {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: 0,
_connections: 2,
_handle: [Object],
_usingSlaves: false,
_slaves: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '4:0.0.0.0:1880',
_webSocketPaths: [Object],
[Symbol(asyncId)]: 772 },
_server:
Server {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: 0,
_connections: 2,
_handle: [Object],
_usingSlaves: false,
_slaves: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '4:0.0.0.0:1880',
_webSocketPaths: [Object],
[Symbol(asyncId)]: 772 },
_idleTimeout: 120000,
_idleNext:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_timer: [Object],
_unrefed: true,
msecs: 120000,
nextTick: false },
_idlePrev:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_timer: [Object],
_unrefed: true,
msecs: 120000,
nextTick: false },
_idleStart: 39624,
_destroyed: false,
parser:
HTTPParser {
'0': [Function: parserOnHeaders],
'1': [Function: parserOnHeadersComplete],
'2': [Function: parserOnBody],
'3': [Function: parserOnMessageComplete],
'4': [Function: bound onParserExecute],
_headers: [],
_url: '',
_consumed: true,
socket: [Circular],
incoming: [Circular],
outgoing: null,
maxHeaderPairs: 2000,
onIncoming: [Function: bound parserOnIncoming] },
on: [Function: socketOnWrap],
_paused: false,
read: [Function],
_consuming: true,
_httpMessage:
ServerResponse {
domain: null,
_events: [Object],
_eventsCount: 1,
_maxListeners: undefined,
output: [],
outputEncodings: [],
outputCallbacks: [],
outputSize: 0,
writable: true,
_last: false,
upgrading: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: '',
finished: false,
_headerSent: false,
socket: [Circular],
connection: [Circular],
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular],
locals: {},
[Symbol(outHeadersKey)]: [Object] },
[Symbol(asyncId)]: 2108,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 2109,
[Symbol(triggerAsyncId)]: 2108 },
connection:
Socket {
connecting: false,
_hadError: false,
_handle:
TCP {
reading: true,
owner: [Circular],
onread: [Function: onread],
onconnection: null,
writeQueueSize: 0,
_consumed: true },
_parent: null,
_host: null,
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: [Object],
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events:
{ end: [Array],
finish: [Function: onSocketFinish],
_socketEnd: [Function: onSocketEnd],
drain: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
error: [Function: socketOnError],
close: [Array],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause] },
_eventsCount: 10,
_maxListeners: undefined,
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 0,
prefinished: false,
errorEmitted: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object] },
writable: true,
allowHalfOpen: true,
_bytesDispatched: 465,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server:
Server {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: 0,
_connections: 2,
_handle: [Object],
_usingSlaves: false,
_slaves: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '4:0.0.0.0:1880',
_webSocketPaths: [Object],
[Symbol(asyncId)]: 772 },
_server:
Server {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: 0,
_connections: 2,
_handle: [Object],
_usingSlaves: false,
_slaves: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '4:0.0.0.0:1880',
_webSocketPaths: [Object],
[Symbol(asyncId)]: 772 },
_idleTimeout: 120000,
_idleNext:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_timer: [Object],
_unrefed: true,
msecs: 120000,
nextTick: false },
_idlePrev:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_timer: [Object],
_unrefed: true,
msecs: 120000,
nextTick: false },
_idleStart: 39624,
_destroyed: false,
parser:
HTTPParser {
'0': [Function: parserOnHeaders],
'1': [Function: parserOnHeadersComplete],
'2': [Function: parserOnBody],
'3': [Function: parserOnMessageComplete],
'4': [Function: bound onParserExecute],
_headers: [],
_url: '',
_consumed: true,
socket: [Circular],
incoming: [Circular],
outgoing: null,
maxHeaderPairs: 2000,
onIncoming: [Function: bound parserOnIncoming] },
on: [Function: socketOnWrap],
_paused: false,
read: [Function],
_consuming: true,
_httpMessage:
ServerResponse {
domain: null,
_events: [Object],
_eventsCount: 1,
_maxListeners: undefined,
output: [],
outputEncodings: [],
outputCallbacks: [],
outputSize: 0,
writable: true,
_last: false,
upgrading: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: '',
finished: false,
_headerSent: false,
socket: [Circular],
connection: [Circular],
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular],
locals: {},
[Symbol(outHeadersKey)]: [Object] },
[Symbol(asyncId)]: 2108,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 2109,
[Symbol(triggerAsyncId)]: 2108 },
httpVersionMajor: 1,
httpVersionMinor: 1,
httpVersion: '1.1',
complete: false,
headers:
{ host: '127.0.0.1:1880',
'user-agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0',
accept: '*/*',
'accept-language': 'en-US,en;q=0.5',
'accept-encoding': 'gzip, deflate',
referer: 'http://127.0.0.1:1880/',
'content-type': 'multipart/form-data; boundary=---------------------------18210612061998272948903541154',
'content-length': '39395364',
connection: 'keep-alive' },
rawHeaders:
[ 'Host',
'127.0.0.1:1880',
'User-Agent',
'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0',
'Accept',
'*/*',
'Accept-Language',
'en-US,en;q=0.5',
'Accept-Encoding',
'gzip, deflate',
'Referer',
'http://127.0.0.1:1880/',
'Content-Type',
'multipart/form-data; boundary=---------------------------18210612061998272948903541154',
'Content-Length',
'39395364',
'Connection',
'keep-alive' ],
trailers: {},
rawTrailers: [],
upgrade: false,
url: '/deployArtifact',
method: 'POST',
statusCode: null,
statusMessage: null,
client:
Socket {
connecting: false,
_hadError: false,
_handle:
TCP {
reading: true,
owner: [Circular],
onread: [Function: onread],
onconnection: null,
writeQueueSize: 0,
_consumed: true },
_parent: null,
_host: null,
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: [Object],
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events:
{ end: [Array],
finish: [Function: onSocketFinish],
_socketEnd: [Function: onSocketEnd],
drain: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
error: [Function: socketOnError],
close: [Array],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause] },
_eventsCount: 10,
_maxListeners: undefined,
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: false,
ended: false,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 0,
prefinished: false,
errorEmitted: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object] },
writable: true,
allowHalfOpen: true,
_bytesDispatched: 465,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server:
Server {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: 0,
_connections: 2,
_handle: [Object],
_usingSlaves: false,
_slaves: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '4:0.0.0.0:1880',
_webSocketPaths: [Object],
[Symbol(asyncId)]: 772 },
_server:
Server {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: 0,
_connections: 2,
_handle: [Object],
_usingSlaves: false,
_slaves: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '4:0.0.0.0:1880',
_webSocketPaths: [Object],
[Symbol(asyncId)]: 772 },
_idleTimeout: 120000,
_idleNext:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_timer: [Object],
_unrefed: true,
msecs: 120000,
nextTick: false },
_idlePrev:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_timer: [Object],
_unrefed: true,
msecs: 120000,
nextTick: false },
_idleStart: 39624,
_destroyed: false,
parser:
HTTPParser {
'0': [Function: parserOnHeaders],
'1': [Function: parserOnHeadersComplete],
'2': [Function: parserOnBody],
'3': [Function: parserOnMessageComplete],
'4': [Function: bound onParserExecute],
_headers: [],
_url: '',
_consumed: true,
socket: [Circular],
incoming: [Circular],
outgoing: null,
maxHeaderPairs: 2000,
onIncoming: [Function: bound parserOnIncoming] },
on: [Function: socketOnWrap],
_paused: false,
read: [Function],
_consuming: true,
_httpMessage:
ServerResponse {
domain: null,
_events: [Object],
_eventsCount: 1,
_maxListeners: undefined,
output: [],
outputEncodings: [],
outputCallbacks: [],
outputSize: 0,
writable: true,
_last: false,
upgrading: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: '',
finished: false,
_headerSent: false,
socket: [Circular],
connection: [Circular],
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular],
locals: {},
[Symbol(outHeadersKey)]: [Object] },
[Symbol(asyncId)]: 2108,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 2109,
[Symbol(triggerAsyncId)]: 2108 },
_consuming: false,
_dumped: false,
next: [Function: next],
baseUrl: '',
originalUrl: '/deployArtifact',
_parsedUrl:
Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: null,
query: null,
pathname: '/deployArtifact',
path: '/deployArtifact',
href: '/deployArtifact',
_raw: '/deployArtifact' },
params: {},
query: {},
res:
ServerResponse {
domain: null,
_events: { finish: [Function: bound resOnFinish] },
_eventsCount: 1,
_maxListeners: undefined,
output: [],
outputEncodings: [],
outputCallbacks: [],
outputSize: 0,
writable: true,
_last: false,
upgrading: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: '',
finished: false,
_headerSent: false,
socket:
Socket {
connecting: false,
_hadError: false,
_handle: [Object],
_parent: null,
_host: null,
_readableState: [Object],
readable: true,
domain: null,
_events: [Object],
_eventsCount: 10,
_maxListeners: undefined,
_writableState: [Object],
writable: true,
allowHalfOpen: true,
_bytesDispatched: 465,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server: [Object],
_server: [Object],
_idleTimeout: 120000,
_idleNext: [Object],
_idlePrev: [Object],
_idleStart: 39624,
_destroyed: false,
parser: [Object],
on: [Function: socketOnWrap],
_paused: false,
read: [Function],
_consuming: true,
_httpMessage: [Circular],
[Symbol(asyncId)]: 2108,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 2109,
[Symbol(triggerAsyncId)]: 2108 },
connection:
Socket {
connecting: false,
_hadError: false,
_handle: [Object],
_parent: null,
_host: null,
_readableState: [Object],
readable: true,
domain: null,
_events: [Object],
_eventsCount: 10,
_maxListeners: undefined,
_writableState: [Object],
writable: true,
allowHalfOpen: true,
_bytesDispatched: 465,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
server: [Object],
_server: [Object],
_idleTimeout: 120000,
_idleNext: [Object],
_idlePrev: [Object],
_idleStart: 39624,
_destroyed: false,
parser: [Object],
on: [Function: socketOnWrap],
_paused: false,
read: [Function],
_consuming: true,
_httpMessage: [Circular],
[Symbol(asyncId)]: 2108,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 2109,
[Symbol(triggerAsyncId)]: 2108 },
_header: null,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular],
locals: {},
[Symbol(outHeadersKey)]: { 'x-powered-by': [Array] } },
body: {},
route:
Route {
path: '/deployArtifact',
stack: [ [Object], [Object] ],
methods: { post: true } } }
如何从请求中获取文件对象以使用'java -jar'命令运行它。根据我的理解，我需要获取文件上传到后端服务器的路径。如何获取文件对象的路径？
答案 0 :(得分：1)
我对RED不太了解。我想您的问题在上传文件/接收文件方面很普遍。
您可能想在发布（上传文件）时查看multipart/form-data
在https://www.w3schools.com/nodejs/nodejs_uploadfiles.asp上有一个非常简单的示例