学习鸿蒙基础（12）

目录

一、网络json-server配置

（1）然后输入：

（2）显示下载成功。但是输入json-server -v的时候。报错。

（3）此时卸载默认的json-server

（4）安装和nodejs匹配版本的json-server

（5）再次输入 json-server -v的时候显示正常了。

​编辑

 （6）此时，随便新建一个文件夹。然后cmd输入以下指令：

 （7）会在该文件夹下新建一个db.json的文件。

 （8）同时在浏览器上访问的时候，可以通过以下路径打开这个json文件。 

 二、数据请求

 （1）用本机的ip地址替换localhost

 （2）http -代码示例：

 （3）ohpm安装

 （4）axios -代码示例

 （5）db.json测试源文件

 （6）db1.json 测试源文件

一、网络json-server配置

网络请求的时候，先安装json-server工具进行网络环境模拟。安装的时候。遇到了错误。一直报错。题主已经在微信小程序使用的时候安装了nodejs环境。可以直接进行npm操作。这里不再演示nodejs的安装方式。只进行json-server的安装步骤展示。

用管理员的模式打开cmd。

（1）然后输入：
npm install -g json-server
（2）显示下载成功。但是输入json-server -v的时候。报错。

 是因为我安装的nodejs版本和默认的json-server 的版本不兼容导致的。

我的nodejs版本是：

C:\WINDOWS\system32>node -v
v14.15.1
（3）此时卸载默认的json-server
npm uninstall -g json-server
（4）安装和nodejs匹配版本的json-server
npm install -g json-server@0.17.3
（5）再次输入 json-server -v的时候显示正常了。
 （6）此时，随便新建一个文件夹。然后cmd输入以下指令：
json-server --watch db.json
 （7）会在该文件夹下新建一个db.json的文件。

（8）同时在浏览器上访问的时候，可以通过以下路径打开这个json文件。 

 

 二、数据请求
（1）用本机的ip地址替换localhost
G:\HuaWei\code>json-server .\db.json --watch --host=192.168.3.188\{^_^}/ hi!Loading .\db.jsonDoneResourceshttp://192.168.3.188:3000/postshttp://192.168.3.188:3000/commentshttp://192.168.3.188:3000/profileHomehttp://192.168.3.188:3000Type s + enter at any time to create a snapshot of the databaseWatching...
（2）http -代码示例：
import http from '@ohos.net.http'@Entry
@Component
struct PageHttp {@State message: string = '网络请求-get'build() {Row() {Column() {Text("网络请求-get")//查询数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {let httpRequest = http.createHttp()const res = await httpRequest.request("http://192.168.3.188:3000/posts", {method: http.RequestMethod.GET,header: {},extraData: { //get的条件author: "刘白云"}})console.log(JSON.stringify(res.result))})Text("网络请求-post")//新增数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {let httpRequest = http.createHttp()const res = await httpRequest.request("http://192.168.3.188:3000/posts", {method: http.RequestMethod.POST,header: {},extraData: { //post为新增数据author: "留白的云"}})console.log(JSON.stringify(res.result))})Text("网络请求-put")//更新数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {let httpRequest = http.createHttp()const res = await httpRequest.request("http://192.168.3.188:3000/posts/2", {method: http.RequestMethod.PUT,header: {},extraData: { //put为更新数据title: "day",author:"刘白云"}})console.log(JSON.stringify(res.result))})Text("网络请求-delete")//删除数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {let httpRequest = http.createHttp()const res = await httpRequest.request("http://192.168.3.188:3000/posts/3", {method: http.RequestMethod.DELETE,header: {},extraData: { }})console.log(JSON.stringify(res.result))})}.width('100%')}.height('100%')}
}
（3）ohpm安装

首先安装ohpm,找到openharmony安装的opm的bin目录下。

cmd  执行 init.bat。

 安装完成后。将ohpm配置到环境变量里。path里新增ohpm的bin目录路径。

 cmd运行。打印 ohpm就会有ohpm的版本号。

但是devstuido终端里打开失败。需要配置权限：powershell用管理员身份打开。

PS C:\WINDOWS\system32> set-executionpolicy remotesigned执行策略更改
执行策略可帮助你防止执行不信任的脚本。更改执行策略可能会产生安全风险，如 https:/go.microsoft.com/fwlink/?LinkID=135170
中的 about_Execution_Policies 帮助主题所述。是否要更改执行策略?
[Y] 是(Y)  [A] 全是(A)  [N] 否(N)  [L] 全否(L)  [S] 暂停(S)  [?] 帮助 (默认值为“N”): A
PS C:\WINDOWS\system32>

使用json-server 开启多个服务

json-server .\db.json --wath --host=192.168.3.188 --port 8000
 （4）axios -代码示例
import http from '@ohos.net.http'
import  axios from '@ohos/axios'
@Entry
@Component
struct Pagehttp1 {@State message: string = 'Hello World'@State list:Object[]=[]// 自带的网络请求// async aboutToAppear() {//   // http网络请求//   let httpRe = http.createHttp();//   let res = await httpRe.request("http://192.168.3.188:3000/data",//     {//       method: http.RequestMethod.GET,//       header: {//       },//       expectDataType:http.HttpDataType.OBJECT//期望返回的数据类型为对象//     })//   console.log(JSON.stringify(res.result))//   this.list=res.result["films"]// }//axios 网络请求async aboutToAppear() {// axios网络请求const res=await axios({url:"http://192.168.3.188:3000/data"})console.log(JSON.stringify(res.data))this.list=res.data["films"]}build() {Row() {Column() {List(){ForEach(this.list,item=>{ListItem(){Row(){Image((item.poster as string).replace("pic.maizuo.com","static.maizuo.com/pc/v5") ).size({width:100})Text(item.name)}.width('100%').alignItems(VerticalAlign.Top)}.margin({bottom:10}).padding(10)},item=>item['filmId'])}}.width('100%')}.height('100%')}
}
import http from '@ohos.net.http'
import axios, { AxiosHeaders } from '@ohos/axios'
@Entry
@Component
struct PageHttp {@State message: string = '网络请求-get'build() {Row() {Column() {
// --------------------------------------axios--------------------------------------Text("axios网络请求-get")//查询数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {const res = await axios({url:"http://192.168.3.188:8000/posts",method:'get',params:{//参数查询author:"刘白云"},data:{ }//data方式 后端接受body-json形式})console.log(JSON.stringify(res.data))})Text("axios网络请求-post")//新增数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {const res=await axios({url:"http://192.168.3.188:8000/posts",method:"post",data:{//新增要用dataauthor: "留白的云axios"}})console.log(JSON.stringify(res.data))})Text("axios网络请求-put")//更新数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {const res = await    axios({url:"http://192.168.3.188:8000/posts/6",method:"put",data:{author: "留白的云666"}})console.log(JSON.stringify(res.data))})Text("axios网络请求-delete")//删除数据.fontSize(30).fontWeight(FontWeight.Bold).onClick(async () => {const res = await axios({url:"http://192.168.3.188:8000/posts/5",method:"delete"})console.log(JSON.stringify(res.data))})}.width('100%')}.height('100%')}
}
 （5）db.json测试源文件
{"posts": [{"id": 1,"title": "json-server","author": "typicode"},{"title": "day","author": "刘白云","id": 2},{"author": "留白的云","id": 4},{"author": "留白的云666","id": 6},{"author": "留白的云axios","id": 7}],"comments": [{"id": 1,"body": "some comment","postId": 1}],"profile": {"name": "typicode"}
}
（6）db1.json 测试源文件
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}

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