场景
Node-RED简介与Windows上安装、启动和运行示例：
Node-RED简介与Windows上安装、启动和运行示例_霸道流氓气质的博客-nodered windows
Node-RED怎样导出导入流程为json文件：
Node-RED怎样导出导入流程为json文件_霸道流氓气质的博客-_怎么导出json文件
Node-RED安装图形化节点dashboard实现订阅mqtt主题并在仪表盘中显示温度：
Node-RED安装图形化节点dashboard实现订阅mqtt主题并在仪表盘中显示温度_霸道流氓气质的博客-
在上面的基础上，怎样将照片转码Base64编码并且显示。
注：
博客：霸道流氓气质的博客_-C#,架构之路,SpringBoot领域博主
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实现
1、可以使用template节点显示base64编码的照片，因为需要base64编码，所以需要安装node-red-node-base64节点。
2、流程设计如下
其中文件选择的实现参考如下
Node-RED中使用node-red-browser-utils节点实现选择Windows操作系统中的文件并实现图片预览：
Node-RED中使用node-red-browser-utils节点实现选择Windows操作系统中的文件并实现图片预览_霸道流氓气质的博客
3、编辑Base64节点
4、编辑template节点，修改模板内容为
<img width="32" height="32" alt="image" src="data:image/jpg;base64,{{msg.payload}}"/>
5、部署运行可以在debug中看到base64编码
访问
即可看到如上效果。
6、完整示例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": "51c3503.61936b",
"type": "MySQLdatabase",
"name": "",
"host": "127.0.0.1",
"port": "3306",
"db": "test",
"tz": "",
"charset": "UTF8"
},
{
"id": "89952106.631b3",
"type": "ui_group",
"name": "IFrame",
"tab": "5967b7da.b44598",
"order": 3,
"disp": true,
"width": "6",
"collapse": false
},
{
"id": "5967b7da.b44598",
"type": "ui_tab",
"name": "Home",
"icon": "dashboard",
"order": 1,
"disabled": false,
"hidden": false
},
{
"id": "531fcba07de311b5",
"type": "ui_group",
"name": "Image",
"tab": "5967b7da.b44598",
"order": 2,
"disp": true,
"width": "6",
"collapse": false
},
{
"id": "09dda5bc17876c15",
"type": "ui_template",
"z": "f4a4d8eab7935bc8",
"group": "531fcba07de311b5",
"name": "Display Image",
"order": 0,
"width": "6",
"height": "5",
"format": "<img width=\"32\" height=\"32\" alt=\"image\" src=\"data:image/jpg;base64,{{msg.payload}}\"/>",
"storeOutMessages": true,
"fwdInMessages": true,
"resendOnRefresh": false,
"templateScope": "local",
"className": "",
"x": 560,
"y": 200,
"wires": [
[]
]
},
{
"id": "84644ef377da9260",
"type": "base64",
"z": "f4a4d8eab7935bc8",
"name": "Encode",
"action": "",
"property": "payload",
"x": 380,
"y": 200,
"wires": [
[
"09dda5bc17876c15",
"c8ffbd902609a179"
]
]
},
{
"id": "af6c79aa897e8ef4",
"type": "fileinject",
"z": "f4a4d8eab7935bc8",
"name": "",
"x": 230,
"y": 200,
"wires": [
[
"84644ef377da9260"
]
]
},
{
"id": "c8ffbd902609a179",
"type": "debug",
"z": "f4a4d8eab7935bc8",
"name": "",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "false",
"statusVal": "",
"statusType": "auto",
"x": 560,
"y": 260,
"wires": []
}
]