本文主要是介绍Node-RED中将CSV数据写入txt文件并从文件中读取解析数据，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

场景

Node-RED简介与Windows上安装、启动和运行示例：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/121884766

Node-RED怎样导出导入流程为json文件：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/124130985

CSV的内容是使用纯文字方式表示的表格资料，第一行是表格的标题，每一列用,隔开。

例如：

Name,height,weight
Joe,170,70
Mary,160,49

怎样将数据存储到txt文件中，需要时从文件中读取并解析获取数据。

注：

博客：
https://blog.csdn.net/badao_liumang_qizhi
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实现

1、页面布局

2、template节点，输入csv资料

3、file节点，将csv资料用utf-8编码写入D://file.txt

4、file in节点，读取file.txt，输出utf-8的一个字符

5、csv节点，剖析csv资料，输入列名，分隔符是逗号，因为第一列是标题列，所以在输入时忽略第一行

输出时选择每行一条信息

6、解析效果

7、json数据

[
    {
        "id": "f4a4d8eab7935bc8",
        "type": "tab",
        "label": "流程 3",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "c428312d1f6165d1",
        "type": "mqtt-broker",
        "name": "mqtt",
        "broker": "127.0.0.1",
        "port": "1883",
        "clientid": "",
        "autoConnect": true,
        "usetls": false,
        "protocolVersion": "4",
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "0",
        "birthPayload": "",
        "birthMsg": {},
        "closeTopic": "",
        "closeQos": "0",
        "closePayload": "",
        "closeMsg": {},
        "willTopic": "",
        "willQos": "0",
        "willPayload": "",
        "willMsg": {},
        "sessionExpiry": ""
    },
    {
        "id": "51eee50b4ec9422f",
        "type": "ui_group",
        "name": "dashboardDemo",
        "tab": "29ae4c620f43ee0d",
        "order": 1,
        "disp": true,
        "width": "6",
        "collapse": false,
        "className": ""
    },
    {
        "id": "29ae4c620f43ee0d",
        "type": "ui_tab",
        "name": "Home",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false
    },
    {
        "id": "a506c767a5c1edbd",
        "type": "ui_base",
        "theme": {
            "name": "theme-light",
            "lightTheme": {
                "default": "#0094CE",
                "baseColor": "#0094CE",
                "baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif",
                "edited": true,
                "reset": false
            },
            "darkTheme": {
                "default": "#097479",
                "baseColor": "#097479",
                "baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif",
                "edited": false
            },
            "customTheme": {
                "name": "Untitled Theme 1",
                "default": "#4B7930",
                "baseColor": "#4B7930",
                "baseFont": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"
            },
            "themeState": {
                "base-color": {
                    "default": "#0094CE",
                    "value": "#0094CE",
                    "edited": false
                },
                "page-titlebar-backgroundColor": {
                    "value": "#0094CE",
                    "edited": false
                },
                "page-backgroundColor": {
                    "value": "#fafafa",
                    "edited": false
                },
                "page-sidebar-backgroundColor": {
                    "value": "#ffffff",
                    "edited": false
                },
                "group-textColor": {
                    "value": "#1bbfff",
                    "edited": false
                },
                "group-borderColor": {
                    "value": "#ffffff",
                    "edited": false
                },
                "group-backgroundColor": {
                    "value": "#ffffff",
                    "edited": false
                },
                "widget-textColor": {
                    "value": "#111111",
                    "edited": false
                },
                "widget-backgroundColor": {
                    "value": "#0094ce",
                    "edited": false
                },
                "widget-borderColor": {
                    "value": "#ffffff",
                    "edited": false
                },
                "base-font": {
                    "value": "-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif"
                }
            },
            "angularTheme": {
                "primary": "indigo",
                "accents": "blue",
                "warn": "red",
                "background": "grey",
                "palette": "light"
            }
        },
        "site": {
            "name": "Node-RED Dashboard",
            "hideToolbar": "false",
            "allowSwipe": "false",
            "lockMenu": "false",
            "allowTempTheme": "true",
            "dateFormat": "DD/MM/YYYY",
            "sizes": {
                "sx": 48,
                "sy": 48,
                "gx": 6,
                "gy": 6,
                "cx": 6,
                "cy": 6,
                "px": 0,
                "py": 0
            }
        }
    },
    {
        "id": "248cbbb0.18e794",
        "type": "ui_group",
        "name": "MyGroup",
        "tab": "3f79c420.cfc1bc",
        "order": 1,
        "disp": true,
        "width": "6",
        "collapse": false
    },
    {
        "id": "3f79c420.cfc1bc",
        "type": "ui_tab",
        "name": "Home",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false
    },
    {
        "id": "a0954be5.a7f7e8",
        "type": "ui_group",
        "name": "MyInput",
        "tab": "3f79c420.cfc1bc",
        "order": 2,
        "disp": true,
        "width": "6",
        "collapse": false
    },
    {
        "id": "508bd6f8398ab80f",
        "type": "ui_group",
        "name": "OpenWeatherMap",
        "tab": "3f79c420.cfc1bc",
        "order": 3,
        "disp": true,
        "width": "6",
        "collapse": false
    },
    {
        "id": "8824dea1.83e31",
        "type": "websocket-client",
        "path": "ws://localhost:9898/",
        "tls": "",
        "wholemsg": "false"
    },
    {
        "id": "f9c23ff5.026e",
        "type": "file",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "filename": "D://file.txt",
        "appendNewline": true,
        "createDir": false,
        "overwriteFile": "true",
        "encoding": "utf8",
        "x": 480,
        "y": 180,
        "wires": [
            []
        ]
    },
    {
        "id": "2ebfe992.fdc746",
        "type": "inject",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "",
        "payloadType": "date",
        "x": 190,
        "y": 240,
        "wires": [
            [
                "cfaafb8.012a108"
            ]
        ]
    },
    {
        "id": "cfaafb8.012a108",
        "type": "file in",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "filename": "D://file.txt",
        "format": "utf8",
        "chunk": false,
        "sendError": false,
        "encoding": "utf8",
        "allProps": false,
        "x": 340,
        "y": 240,
        "wires": [
            [
                "ee4f2b44.0fc328"
            ]
        ]
    },
    {
        "id": "32435220.d9c6ee",
        "type": "debug",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload.weight",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 680,
        "y": 280,
        "wires": []
    },
    {
        "id": "ee4f2b44.0fc328",
        "type": "csv",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "sep": ",",
        "hdrin": "",
        "hdrout": "none",
        "multi": "one",
        "ret": "\\n",
        "temp": "name,height,weight",
        "skip": "1",
        "strings": true,
        "include_empty_strings": "",
        "include_null_values": "",
        "x": 470,
        "y": 240,
        "wires": [
            [
                "f250620f.1071d",
                "d9c16f6a.a9d4b",
                "32435220.d9c6ee"
            ]
        ]
    },
    {
        "id": "f250620f.1071d",
        "type": "debug",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload.name",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 670,
        "y": 200,
        "wires": []
    },
    {
        "id": "d9c16f6a.a9d4b",
        "type": "debug",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload.height",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 670,
        "y": 240,
        "wires": []
    },
    {
        "id": "277f6cb6.89e434",
        "type": "template",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "field": "payload",
        "fieldType": "msg",
        "format": "handlebars",
        "syntax": "mustache",
        "template": "Name,height,weight\nJoe,170,70\nMary,160,49",
        "output": "str",
        "x": 330,
        "y": 180,
        "wires": [
            [
                "f9c23ff5.026e"
            ]
        ]
    },
    {
        "id": "f22a93b5.26844",
        "type": "inject",
        "z": "f4a4d8eab7935bc8",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payloadType": "date",
        "x": 190,
        "y": 180,
        "wires": [
            [
                "277f6cb6.89e434"
            ]
        ]
    }
] 

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