Angular 2 http GET json 文件 returns 404
Angular 2 http GET for json file returns 404
我正在做一个 POC 来证明我在 Angular Universal 中的后端和前端之间有通信。我在后端有一个名为 heroes.json 的 JSON 文件,我想从 model.service.ts
.
中的前端服务 ModelService
中检索它
我有这个文件夹结构:
在 model.service.ts
(前端)中,我想创建一个 http 请求以在名为 getStuff()
的方法中获取一些数据。
我在 model.service.ts 中有这个:
// domain/feature service
@Injectable()
export class ModelService {
private heroesUrl = "http://localhost:4000/src/backend/heroes.json"; // URL to JSON file
// This is only one example of one Model depending on your domain
constructor(public api: ApiService, public cacheService: CacheService, private http: Http) {
}
public getStuff(): Observable<any[]> {
return this.http.get(this.heroesUrl)
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
let body = res.json();
return body.data || { };
}
private handleError (error: Response | any) {
// In a real world app, we might use a remote logging infrastructure
let errMsg: string;
if (error instanceof Response) {
const body = error.json() || "";
const err = body.error || JSON.stringify(body);
errMsg = `${error.status} - ${error.statusText || ""} ${err}`;
} else {
errMsg = error.message ? error.message : error.toString();
}
console.error(errMsg);
return Observable.throw(errMsg);
}
// domain/feature service
@Injectable()
export class ModelService {
private heroesUrl = "http://localhost:4000/src/backend/heroes.json"; // URL to JSON file
// This is only one example of one Model depending on your domain
constructor(public api: ApiService, public cacheService: CacheService, private http: Http) {
}
public getStuff(): Observable<any[]> {
return this.http.get(this.heroesUrl)
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
let body = res.json();
return body.data || { };
}
private handleError (error: Response | any) {
// In a real world app, we might use a remote logging infrastructure
let errMsg: string;
if (error instanceof Response) {
const body = error.json() || "";
const err = body.error || JSON.stringify(body);
errMsg = `${error.status} - ${error.statusText || ""} ${err}`;
} else {
errMsg = error.message ? error.message : error.toString();
}
console.error(errMsg);
return Observable.throw(errMsg);
}
我从前端组件调用 ModelService.getHeroes:
export class HomeComponent {
public data: any = {};
constructor(public modelService: ModelService) {
// we need the data synchronously for the client to set the server response
// we create another method so we have more control for testing
this.universalInit();
}
public universalInit() {
this.modelService.getStuff().subscribe((data) => {
this.data = data;
});
}
我收到这个错误:
GET /src/backend/heroes.json 404 3.698 ms - 46
404 - {"status":404,"message":"No Content"}
EXCEPTION: 404 - {"status":404,"message":"No Content"}
/private/var/root/vepo/node_modules/rxjs/Subscriber.js:227
throw err;
^
404 - {"status":404,"message":"No Content"}
[nodemon] app crashed - waiting for file changes before starting...
所以我在服务中的urlprivate heroesUrl = "http://localhost:4000/src/backend/heroes.json"; // URL to JSON file
是错误的。鉴于该文件夹结构,url 是什么?因为实际的 运行 项目,输出,在 dist:
所以我不确定要在 ModelService.heroesUrl
中输入什么。 ModelService.heroesUrl
应该有什么字符串值?
您必须将 json 文件放入您的 dist 文件夹客户端,并且您必须将 url 更改为 http://localhost:4000/dist/heroes.json<-- destination where you are putting your json file in dist directory
我将相同的文件 places.json
放入 "assets"
文件夹
在设置 url 之后:
places = this.http.request("http://localhost:4200/assets/places.json")
希望此信息对某些人有所帮助。
将包含模拟数据的目录添加到 angular-cli.json 中的 "assets" 部分。
我正在做一个 POC 来证明我在 Angular Universal 中的后端和前端之间有通信。我在后端有一个名为 heroes.json 的 JSON 文件,我想从 model.service.ts
.
ModelService
中检索它
我有这个文件夹结构:
在 model.service.ts
(前端)中,我想创建一个 http 请求以在名为 getStuff()
的方法中获取一些数据。
我在 model.service.ts 中有这个:
// domain/feature service
@Injectable()
export class ModelService {
private heroesUrl = "http://localhost:4000/src/backend/heroes.json"; // URL to JSON file
// This is only one example of one Model depending on your domain
constructor(public api: ApiService, public cacheService: CacheService, private http: Http) {
}
public getStuff(): Observable<any[]> {
return this.http.get(this.heroesUrl)
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
let body = res.json();
return body.data || { };
}
private handleError (error: Response | any) {
// In a real world app, we might use a remote logging infrastructure
let errMsg: string;
if (error instanceof Response) {
const body = error.json() || "";
const err = body.error || JSON.stringify(body);
errMsg = `${error.status} - ${error.statusText || ""} ${err}`;
} else {
errMsg = error.message ? error.message : error.toString();
}
console.error(errMsg);
return Observable.throw(errMsg);
}
// domain/feature service
@Injectable()
export class ModelService {
private heroesUrl = "http://localhost:4000/src/backend/heroes.json"; // URL to JSON file
// This is only one example of one Model depending on your domain
constructor(public api: ApiService, public cacheService: CacheService, private http: Http) {
}
public getStuff(): Observable<any[]> {
return this.http.get(this.heroesUrl)
.map(this.extractData)
.catch(this.handleError);
}
private extractData(res: Response) {
let body = res.json();
return body.data || { };
}
private handleError (error: Response | any) {
// In a real world app, we might use a remote logging infrastructure
let errMsg: string;
if (error instanceof Response) {
const body = error.json() || "";
const err = body.error || JSON.stringify(body);
errMsg = `${error.status} - ${error.statusText || ""} ${err}`;
} else {
errMsg = error.message ? error.message : error.toString();
}
console.error(errMsg);
return Observable.throw(errMsg);
}
我从前端组件调用 ModelService.getHeroes:
export class HomeComponent {
public data: any = {};
constructor(public modelService: ModelService) {
// we need the data synchronously for the client to set the server response
// we create another method so we have more control for testing
this.universalInit();
}
public universalInit() {
this.modelService.getStuff().subscribe((data) => {
this.data = data;
});
}
我收到这个错误:
GET /src/backend/heroes.json 404 3.698 ms - 46
404 - {"status":404,"message":"No Content"}
EXCEPTION: 404 - {"status":404,"message":"No Content"}
/private/var/root/vepo/node_modules/rxjs/Subscriber.js:227
throw err;
^
404 - {"status":404,"message":"No Content"}
[nodemon] app crashed - waiting for file changes before starting...
所以我在服务中的urlprivate heroesUrl = "http://localhost:4000/src/backend/heroes.json"; // URL to JSON file
是错误的。鉴于该文件夹结构,url 是什么?因为实际的 运行 项目,输出,在 dist:
所以我不确定要在 ModelService.heroesUrl
中输入什么。 ModelService.heroesUrl
应该有什么字符串值?
您必须将 json 文件放入您的 dist 文件夹客户端,并且您必须将 url 更改为 http://localhost:4000/dist/heroes.json<-- destination where you are putting your json file in dist directory
我将相同的文件 places.json
放入 "assets"
文件夹
在设置 url 之后:
places = this.http.request("http://localhost:4200/assets/places.json")
希望此信息对某些人有所帮助。
将包含模拟数据的目录添加到 angular-cli.json 中的 "assets" 部分。