场景
Node-RED简介与Windows上部安装、启动和运行示例：
Node-RED简介与Windows安装、启动和运行示例_霸道流氓气质的博客-CSDN博客
Node-RED导入过程如何导出？json文件：
Node-RED导入过程如何导出？json文件_霸道流氓气质的博客-CSDN博客
json示例数据如下
[{"title": "ASP.NET网页程序设计", "author": "陈会安", "category": "Web", "pubdate": "06/2015", "id": "W101"}, {"title": "PHP网页程序设计", "author": "陈会安", "category": "Web", "pubdate": "07/2015", "id": "W102"}, {"title": "Java程式设计", "author": "陈会安", "category": "Programming", "pubdate": "11/2015", "id": "P102"}, {"title": "Android程式设计", "author": "陈会安", "category": "Mobile", "pubdate": "07/2015", "id": "M102"}]
怎样解析该json获取指定对象的属性。
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 关注公众号 霸道的程序猿 获取与编程相关的电子书、教程推送和免费下载。
实现
1、使用http request组件请求json数据，请求地址
https://fchart.github.io/books.json
2、使用json分析组件并选择JSON字符串与对象互转
3.输出选择第一个对象title属性
4、效果
5、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": "ffb7767d.5ec0c8",
"type": "http request",
"z": "f4a4d8eab7935bc8",
"name": "",
"method": "GET",
"ret": "txt",
"paytoqs": "ignore",
"url": "https://fchart.github.io/books.json",
"tls": "",
"persist": false,
"proxy": "",
"authType": "",
"senderr": false,
"x": 360,
"y": 180,
"wires": [
[
"77c6d060.4df97"
]
]
},
{
"id": "a7936a3e.034b98",
"type": "inject",
"z": "f4a4d8eab7935bc8",
"name": "",
"repeat": "",
"crontab": "",
"once": false,
"topic": "",
"payload": "",
"payloadType": "date",
"x": 210,
"y": 180,
"wires": [
[
"ffb7767d.5ec0c8"
]
]
},
{
"id": "77c6d060.4df97",
"type": "json",
"z": "f4a4d8eab7935bc8",
"name": "",
"property": "payload",
"action": "",
"pretty": false,
"x": 510,
"y": 180,
"wires": [
[
"80b292a2.4dcf5",
"5f300589.d8d4fc"
]
]
},
{
"id": "80b292a2.4dcf5",
"type": "debug",
"z": "f4a4d8eab7935bc8",
"name": "",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload[0].title",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 710,
"y": 200,
"wires": []
},
{
"id": "5f300589.d8d4fc",
"type": "debug",
"z": "f4a4d8eab7935bc8",
"name": "",
"active": true,
"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "payload[0].id",
"targetType": "msg",
"statusVal": "",
"statusType": "auto",
"x": 710,
"y": 140,
"wires": []
}
]