node-red File讀取好保存

File節點是操做文件的節點

file文件的保存

 

拖拽 注入節點inject  file節點（writes msg.payload to a file）和 debug節點到工做區，並連線

設置file節點的文件路徑

• windows若是不設置路徑，會保存在C:\Users\Administrator
• docker容器保存在根目錄下

 

此處文件名我選擇 放到data目錄下，由於docker容器啓動的時候我把/data目錄掛載到宿主機上了，方便查看文件

行爲有三種，追加至文件  複寫文件  刪除文件

勾選上建立目錄，不然若是目錄和文件不存在，須要手動建立

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

文件的讀取和保存相似

 把上面的file寫節點換成file讀節點(Reads the contents of a file...)

第一個注入節點inject只是啓動發送信號做用

debug區域顯示文件內容: