Node-RED中怎样在HTML中显示图片文件

喜欢ヅ旅行 2023-09-30 13:08 42阅读 0赞

## 场景 ##

Node-RED中建立静态网页和动态网页内容：

[Node-RED中建立静态网页和动态网页内容\_霸道流氓气质的博客-CSDN博客][Node-RED_-CSDN]

上面使用html文字内容实构造Web网站，在HTML网页中显示照片。

注：

博客：  
[霸道流氓气质的博客\_CSDN博客-C\#,架构之路,SpringBoot领域博主][CSDN_-C_SpringBoot]  
关注公众号  
霸道的程序猿  
获取编程相关电子书、教程推送与免费下载。

## 实现 ##

1、设计流程

![52a7df1866fd89b1be41f1eaa4be3d32.png][]

2、第一个流程/image路由使用read file节点读取和显示文件

编辑read file节点

![433bb658280b39b9f6a2285aff57b76c.png][]

3、编辑http response节点，响应头为image/png

![6f70bde79541542aa63163ce96d68976.png][]

4、部署之后，访问

[http://127.0.0.1:1880/image][http_127.0.0.1_1880_image]

![ee9d1115211a466201c182d1fb4c4a3b.png][]

5、第二个流程主要编辑template节点中HTML中建立访问图片的img标签，src属性就是对应上面第一个流程的

/image路由

![de24c4be6024939cb4684b17a28f6ed2.png][]

<html>
        <head>
            <title>显示图片</title>
        </head>
        <body>
            <h1>霸道的程序猿</h1>
            <img src="/image" height="200" weight="200"/>
        </body>
    </html>

6、部署后访问

[http://127.0.0.1:1880/show][http_127.0.0.1_1880_show]

![b1039e6602c951012c8559d907947e01.png][]

7、流程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": "31b22689.e7deda",
            "type": "http in",
            "z": "f4a4d8eab7935bc8",
            "name": "",
            "url": "/image",
            "method": "get",
            "upload": false,
            "swaggerDoc": "",
            "x": 310,
            "y": 160,
            "wires": [
                [
                    "b2b11d4c.15923"
                ]
            ]
        },
        {
            "id": "4003fe7.4ff1b",
            "type": "http response",
            "z": "f4a4d8eab7935bc8",
            "name": "响应图片",
            "statusCode": "",
            "headers": {
                "Content-type": "image/png"
            },
            "x": 680,
            "y": 160,
            "wires": []
        },
        {
            "id": "b2b11d4c.15923",
            "type": "file in",
            "z": "f4a4d8eab7935bc8",
            "name": "",
            "filename": "D:\\badao.png",
            "format": "",
            "chunk": false,
            "sendError": false,
            "encoding": "none",
            "allProps": false,
            "x": 500,
            "y": 160,
            "wires": [
                [
                    "4003fe7.4ff1b"
                ]
            ]
        },
        {
            "id": "37277f7.5a9618",
            "type": "http in",
            "z": "f4a4d8eab7935bc8",
            "name": "",
            "url": "/show",
            "method": "get",
            "upload": false,
            "swaggerDoc": "",
            "x": 300,
            "y": 220,
            "wires": [
                [
                    "dc3ceb63.2bfd08"
                ]
            ]
        },
        {
            "id": "f9cb5a4a.9ced48",
            "type": "http response",
            "z": "f4a4d8eab7935bc8",
            "name": "",
            "statusCode": "",
            "headers": {},
            "x": 610,
            "y": 220,
            "wires": []
        },
        {
            "id": "dc3ceb63.2bfd08",
            "type": "template",
            "z": "f4a4d8eab7935bc8",
            "name": "显示图片",
            "field": "payload",
            "fieldType": "msg",
            "format": "handlebars",
            "syntax": "mustache",
            "template": "<html>\n    <head>\n        <title>显示图片</title>\n    </head>\n    <body>\n        <h1>霸道的程序猿</h1>\n        <img src=\"/image\" height=\"200\" weight=\"200\"/>\n    </body>\n</html>",
            "output": "str",
            "x": 460,
            "y": 220,
            "wires": [
                [
                    "f9cb5a4a.9ced48"
                ]
            ]
        }
    ]

[Node-RED_-CSDN]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/124211653
[CSDN_-C_SpringBoot]: https://blog.csdn.net/badao_liumang_qizhi
[52a7df1866fd89b1be41f1eaa4be3d32.png]: https://img-blog.csdnimg.cn/img_convert/52a7df1866fd89b1be41f1eaa4be3d32.png
[433bb658280b39b9f6a2285aff57b76c.png]: https://img-blog.csdnimg.cn/img_convert/433bb658280b39b9f6a2285aff57b76c.png
[6f70bde79541542aa63163ce96d68976.png]: https://img-blog.csdnimg.cn/img_convert/6f70bde79541542aa63163ce96d68976.png
[http_127.0.0.1_1880_image]: http://127.0.0.1:1880/image
[ee9d1115211a466201c182d1fb4c4a3b.png]: https://img-blog.csdnimg.cn/img_convert/ee9d1115211a466201c182d1fb4c4a3b.png
[de24c4be6024939cb4684b17a28f6ed2.png]: https://img-blog.csdnimg.cn/img_convert/de24c4be6024939cb4684b17a28f6ed2.png
[http_127.0.0.1_1880_show]: http://127.0.0.1:1880/show
[b1039e6602c951012c8559d907947e01.png]: https://img-blog.csdnimg.cn/img_convert/b1039e6602c951012c8559d907947e01.png