Angular中使用HttpClientModule模块实现get请求数据和post提交数据

以你之姓@ 2023-10-06 08:54 42阅读 0赞

## 场景 ##

Angular介绍、安装Angular Cli、创建Angular项目入门教程：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/105570017 ][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_105570017]

Angular新建组件以及组件之间的调用：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/105694997][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_105694997]

通过以上搭建起Angular项目。

注：

博客：  
[https://blog.csdn.net/badao\_liumang\_qizhi][https_blog.csdn.net_badao_liumang_qizhi]  
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## 实现 ##

Angular5.x 以后get、post 和和服务器交互使用的是HttpClientModule 模块。

### 使用HttpClientModule实现get请求数据 ###

1.在app.module.ts 中引入HttpClientModule 并注入

import {HttpClientModule} from '@angular/common/http';

注入

imports: [
        BrowserModule,
        FormsModule,
        AppRoutingModule,
        HttpClientModule
      ],

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

2.在用到的地方引入HttpClient 并在构造函数声明

import {HttpClient} from "@angular/common/http";

constructor(public http:HttpClient) { }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

3.get请求数据

在用到请求数据的html中添加一个button并添加点击事件，然后再添加一个ul来显示获取到的数据

<button (click) = "getData()">get请求数据</button>
    <br>
    <hr>
    
    <ul>
        <li *ngFor = "let item of list">{
       {item.title}}</li>
    </ul>

在ts中首先声明一个list数组来存储响应的数据

public list:any[] = [];

然后在按钮的点击事件中

getData()
      {
        var api = "http://xxx.com/api/productlist";
        this.http.get(api).subscribe((response:any) =>{
          console.log(response);
          this.list = response.result;
        });
      }

其中api是获取数据的后台接口，这里数据在响应的result中，所以获取数据使用response.result

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

然后运行项目，点击按钮看效果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

### 使用HttpClientModule实现post提交数据 ###

1.在app.module.ts 中引入HttpClientModule 并注入

import {HttpClientModule} from '@angular/common/http';

注入

imports: [
        BrowserModule,
        FormsModule,
        AppRoutingModule,
        HttpClientModule
      ],

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

2.在用到的地方引入HttpClient 和HttpHeaders并在构造函数声明HttpClient

import {HttpClient,HttpHeaders} from "@angular/common/http";

constructor(public http:HttpClient) { }

3.post提交数据

为了测试效果搭建一个后台服务端，这里使用node

#### 搭建node服务端 ####

新建文件夹nodejs\_serve,然后在此文件夹下新建两个文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5][]

其中app.js代码为

然后package.json代码为

{
      "dependencies": {
        "ejs": "^2.5.6",
        "express": "^4.15.3",
        "socket.io": "^2.0.3",
        "body-parser": "~1.17.1"
      }
    }

然后在此目录下打开cmd输入

npm install

或者

cnpm install

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 6][]

安装依赖完成后运行项目

node app.js

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 7][]

然后打开浏览器输入

[http://localhost:3000/][http_localhost_3000]

看到如下则是项目运行成功

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 8][]

####    post提交数据 ####

首先在页面上添加一个按钮并设置按钮的点击事件

<button (click) = "doLogin()">post提交数据</button>

然后在点击事件多对应的方法中

doLogin()
      {
        const httpOptions = {
          headers: new HttpHeaders({ 'Content-Type': 'application/json' })
          };
          var api = "http://127.0.0.1:3000/doLogin";
          this.http.post(api,{username:'霸道',age:'24'},httpOptions).subscribe(response => {
          console.log(response);
          });
    
      }

注意上面headers的书写方式

然后运行项目点击按钮

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 9][]

此时查看node服务端控制台

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 10][]

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_105570017]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/105570017
[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_105694997]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/105694997
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
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[http_localhost_3000]: http://localhost:3000/
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