java执⾏nodejs_我应该如何从Java应⽤程序运⾏NodeJS？⼩编典典
最后，我的解决⽅案是像这样使⽤ProcessBuilder：
(defn create-process-builder [js-engine]
(doto (ProcessBuilder. ["node" (:path js-engine)
"--port-file" (:port-file js-engine)
"--default-ajax-host" (:default-ajax-host js-engine)
"--default-ajax-port" (str (:default-ajax-port js-engine))])
.inheritIO))
然后在其中调⽤start。initializeIO使它的输出转到当前进程的输出，该进程有效地合并了stdout和stderr。
最重要的是，NodeJS通过指定0作为端⼝号来打开随机端⼝，并将其写⼊⽂件：
(let [app (-> (express)
(.use (cookie-parser))
(.get "/" (fn [_req res] (.send res "Universal JavaScript engine for server side pre-rendering single page applications.")))
(.get "/render" render))
server (.createServer http app)]
(.listen server 0 (fn [] (.writeFile fs (:port-file options) (.-port (.address server)))))))))
然后由Java端打开(等待它出现)：
(defn get-port-number [js-engine]
(or (with-timeoutjava调用js的ajax
(:start-timeout js-engine)
(loop [port-number (read-port-file js-engine)]
(if (string/blank? port-number)
(if (is-running? js-engine)
(do (Thread/sleep 100)
(recur (read-port-file js-engine)))
(throw (Exception. (str "While waiting for port number, process died: " (:path js-engine)))))
port-number)))
(throw (Exception. (str "Waited for " (:start-timeout js-engine) " for " (:path js-engine) " to start and report its port number but it timed out.")))))
2020-07-07

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