File節(jié)點(diǎn)是操作文件的節(jié)點(diǎn)

file文件的保存

拖拽 注入節(jié)點(diǎn)inject  file節(jié)點(diǎn)（writes msg.payload to a file）和 debug節(jié)點(diǎn)到工作區(qū)，并連線

設(shè)置file節(jié)點(diǎn)的文件路徑

windows如果不設(shè)置路徑，會(huì)保存在C:/Users/Administratordocker容器保存在根目錄下

此處文件名我選擇 放到data目錄下，因?yàn)閐ocker容器啟動(dòng)的時(shí)候我把/data目錄掛載到宿主機(jī)上了，方便查看文件

行為有三種，追加至文件  復(fù)寫文件  刪除文件

勾選上創(chuàng)建目錄，否則如果目錄和文件不存在，需要手動(dòng)創(chuàng)建

例子：

[{"id":"898828bc.89b418","type":"inject","z":"6c70a17b.e110f","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":290,"y":300,"wires":[["1e951d4f.b4d6a3"]]},{"id":"1e951d4f.b4d6a3","type":"file","z":"6c70a17b.e110f","name":"save","filename":"/data/testtimestamp.txt","appendNewline":true,"createDir":true,"overwriteFile":"false","encoding":"none","x":450,"y":300,"wires":[["c27669f0.bef7e8"]]},{"id":"c27669f0.bef7e8","type":"debug","z":"6c70a17b.e110f","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":610,"y":300,"wires":[]}]

文件的讀取

文件的讀取和保存類似

 把上面的file寫節(jié)點(diǎn)換成file讀節(jié)點(diǎn)(Reads the contents of a file...)

第一個(gè)注入節(jié)點(diǎn)inject只是啟動(dòng)發(fā)送信號(hào)作用

debug區(qū)域顯示文件內(nèi)容:

以上就是關(guān)于node-red File讀取好保存的全部知識(shí)點(diǎn)內(nèi)容，感謝大家對(duì)武林網(wǎng)的支持。