创建服务
新建一个服务文件
ng g service blog/note-service
我们可以参考shared\service-proxies\service-proxies.ts文件来写我们的服务文件，这是模板提供的，看最上面的介绍，说的好像是用NSwag自动生成的，博主现在是用不了这个工具，有办法用的请指教。
image.png
service-proxies.ts
先把后台Api地址拷过来吧
// api域名
const ApiHost = 'http://localhost:21021';
// api地址
const NoteApiUrls = {
Create: ApiHost + '/api/services/app/NoteAppServer/Create',
PublicNote: ApiHost + '/api/services/app/NoteAppServer/PublicNote',
Update: ApiHost + '/api/services/app/NoteAppServer/Update',
GetAll: ApiHost + '/api/services/app/NoteAppServer/GetAll',
GetNote: ApiHost + '/api/services/app/NoteAppServer/GetNote',
Delete: ApiHost + '/api/services/app/NoteAppServer/Delete'
};
现在使用typeScript来写代码，创建服务基本和我们写后台的service差不多了。现在我们来定义数据的载体DTO，基本和后台一样。所以这个能用代码生成器生成也是很能理解的。
export class PageOfNoteDto {
totalCount: number;
items: NoteDto[];
}
export class CreateNoteDto {
textType: number
}
// 首字母必须小写
export class NoteDto {
title: string;
creationTime: string;
id: number;
like: number;
collect: number;
scan: number;
isPublic: boolean;
}
先照着写一个方法吧
import {SwaggerException} from '@shared/service-proxies/service-proxies';
export class NoteServiceService {
protected jsonParseReviver: (key: string, value: any) => any = undefined;
constructor(private http: Http) {
}
// 对于get请求我们要把参数拼接到url上面，这是api的特殊地方
GetAll(MaxResultCount = 20, SkipCount = 0, key = ''): Observable<PageOfNoteDto> {
let url_ = NoteApiUrls.GetAll + '?';
url_ += 'SkipCount=' + encodeURIComponent('' + SkipCount) + '&';
url_ += 'MaxResultCount=' + encodeURIComponent('' + MaxResultCount) + '&';
url_ += 'key=' + encodeURIComponent('' + key);
url_ = url_.replace(/[?&]$/, '');
const options_ = {
method: 'get',
headers: new Headers({
'Content-Type': 'application/json',
'Accept': 'application/json'
})
};
return this.http.request(url_, options_).flatMap((response_) => {
return this.processGetAll(response_);
}).catch((response_: any) => {
if (response_ instanceof Response) {
try {
return this.processGetAll(response_);
} catch (e) {
return <Observable<PageOfNoteDto>><any>Observable.throw(e);
}
} else
return <Observable<PageOfNoteDto>><any>Observable.throw(response_);
});
}
protected processGetAll(response: Response): Observable<PageOfNoteDto> {
const status = response.status;
const _headers: any = response.headers ? response.headers.toJSON() : {};
if (status === 200) {
const _responseText = response.text();
let result200: any = null;
const resultData200 = _responseText === '' ? null : JSON.parse(_responseText, this.jsonParseReviver);
result200 = resultData200 ? resultData200 as PageOfNoteDto : new PageOfNoteDto();
console.log(_responseText);
console.log(result200);
console.log(resultData200);
return Observable.of(result200);
} else if (status === 401) {
const _responseText = response.text();
return this.throwException('服务器错误', status, _responseText, _headers);
} else if (status === 403) {
const _responseText = response.text();
return this.throwException('服务器错误', status, _responseText, _headers);
} else if (status !== 200 && status !== 204) {
const _responseText = response.text();
return this.throwException('意料之外的出现', status, _responseText, _headers);
}
return Observable.of<PageOfNoteDto>(<any>null);
}
protected throwException(message: string, status: number, response: string,
headers: { [key: string]: any; }, result?: any): Observable<any> {
if (result !== null && result !== undefined) {
return Observable.throw(result);
} else {
return Observable.throw(new SwaggerException(message, status, response, headers, null));
}
}
}
使用服务
在我们的note.component.ts中引入来看看我们服务对不对。
import { Component, OnInit, Injector } from '@angular/core';
import { appModuleAnimation } from '@shared/animations/routerTransition';
import { PagedListingComponentBase, PagedRequestDto } from 'shared/paged-listing-component-base';
import {NoteDto, NoteServiceService, PageOfNoteDto} from '@app/blog/note-service.service'
@Component({
selector: 'app-note',
templateUrl: './note.component.html',
styleUrls: ['./note.component.css'],
animations: [appModuleAnimation()]
})
export class NoteComponent extends PagedListingComponentBase<NoteDto> {
constructor(private noteService: NoteServiceService,
injector: Injector) {
super(injector);
}
protected list(request: PagedRequestDto, pageNumber: number, finishedCallback: Function): void {
this.noteService.GetAll(20, 0 )
.finally(() => {
finishedCallback();
})
.subscribe((result: PageOfNoteDto) => {
console.log(result);
});
}
protected delete(user: NoteDto): void {
}
}
出错了，服务没有提供
是因为在app.module.ts里面没有引入的原因：
import {NoteServiceService} from '@app/blog/note-service.service'
providers: [
NoteServiceService
]
再试一下呢。
没有权限啊~~~
在角色管理页面给当前用户的角色添加notes这个权限。因为我们后台添加了访问权限的
给当前用户添加权限
控制台没有报错，还打印出来一些东西，貌似就是我们后台传来的数据
看来通信正常，可以继续完善页面了。
notes: NoteDto[]; // 文章列表
protected list(request: PagedRequestDto, pageNumber: number, finishedCallback: Function): void {
this.noteService.GetAll(request.maxResultCount, request.skipCount)
.finally(() => {
finishedCallback();
})
.subscribe((result: PageOfNoteDto) => {
this.notes = result.items;
this.showPaging(result, pageNumber);
});
}
把用户页面（users.component.html）的内容拷贝过来，放在我们note.component.html文件里，进行如下修改。
<div class="row clearfix" [@routerTransition]>
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12">
<div class="card main-content">
<div class="header">
<h2>
文章列表
</h2>
<ul class="header-dropdown m-r--5">
<i class="fa fa-spin fa-spinner" *ngIf="isTableLoading"></i>
<li class="dropdown">
<a href="javascript:void(0);" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
<i class="material-icons">more_vert</i>
</a>
<ul class="dropdown-menu pull-right">
<li><a href="javascript:void(0);" class=" waves-effect waves-block()" (click)="refresh();"><i class="material-icons">refresh</i> {{l('Refresh')}}</a></li>
</ul>
</li>
</ul>
</div>
<div class="body table-responsive">
<!-- ******************************************************** -->
<table class="table table-hover table-striped">
<thead>
<tr>
<th>文章标题</th>
<th>阅读次数</th>
<th>点赞次数</th>
<th>
<div style="text-align:center">是否发布</div>
</th>
<th>创建时间</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<tr *ngFor="let note of notes | paginate: { id: 'server', itemsPerPage: pageSize, currentPage: pageNumber, totalItems: totalItems }">
<td>{{note.title}}</td>
<td>{{note.scan}}</td>
<td>{{note.like}}</td>
<td align="center">
<i class="material-icons" *ngIf="note.isPublic" style="color:green;">check_box</i>
<i class="material-icons" *ngIf="!note.isPublic" style="color:red;">indeterminate_check_box</i>
</td>
<td>{{note.creationTime}}</td>
<td class="dropdown">
<a href="javascript:void(0);" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
<i class="material-icons">menu</i>
</a>
<ul class="dropdown-menu pull-right">
<li><a href="javascript:void(0);" class="waves-effect waves-block" (click)="editUser(note)"><i class="material-icons">create</i>编辑}</a></li>
<li><a href="javascript:void(0);" class="waves-effect waves-block" (click)="delete(note)"><i class="material-icons">delete_sweep</i>修改</a></li>
</ul>
</td>
</tr>
</tbody>
</table>
<!-- ******************************************************** -->
<div class="text-align: center;" *ngIf="totalItems > pageSize">
<pagination-controls (pageChange)="getDataPage($event)" id="server"></pagination-controls>
</div>
<button type="button" data-toggle="modal" class="btn btn-primary btn-circle waves-effect waves-circle waves-float pull-right" (click)="createUser()">
<i class="material-icons">add</i>
</button>
</div>
</div>
</div>
</div>
数据库里只有两条测试数据
思考
- 我们继承了PagedListingComponentBase类，可以仔细看看这个类的定义，学习下高级架构师在封装这些公用基类时都考虑了些什么，我们该如何来扩展。
- {l('Users')}是什么意思，l是本地化的意思，可以根据我们界面右上角的语言选择来自动显示不同的语言文字。后面将要学习下如何使用，这显得我们的软件更加的国际化。
- 既然我们用不了代码生成器，那么完全照着抄写service是不是很累？ 我们可以自自己写一个dto的代码生成器，至于service我们可以抽象出一个基类来嘛。
