爲什麼我不需要JSON.stringify（）這個帖子的有效載荷？

而且兩者建議創建頭，做一個POST請求，其工作之前stringfy我的對象到JSON，但我注意到，如果我只是通過它的工作原理也很好。

所以我只是想知道誰是這種行爲的責任，因爲我相信一些圖層將對象轉換爲JSON格式。或不？

我使用：

角4的前端。
Wildfly 10.1.0最終
RestEasy的3.1.1最終

我有一個person.component.ts以下方法：

addPerson() { 
    this.personService.save(this.person) 
     .then(result => { 
     console.log('Added!', result); 
     }); 
    }

一個人.service.ts與保存方法：

save(person: Person){ 
    //OPTION 3 
    return this.http.post(`${this.baseURL}person/add`, person).toPromise(); 
}

後端我有我的REST應用類：

@ApplicationPath("/rest") 
public class HouseApplication extends Application { 

    public HouseApplication() {} 
}

和我一個人的資源：

@RequestScoped 
@Path("/person") 
@Produces({ "application/json" }) 
@Consumes({ "application/json" }) 
public class PersonResource { 

    public PersonResource() {} 

    @Inject 
    PersonService personService; 

    @POST 
    @Path("/add") 
    public void addPerson(Person person) throws HouseValidationException{ 
     personService.add(person); 
    } 
    ...

我真的開始在前端的例外，但我得到的記錄持續到數據庫。我覺得例外是涉及到我使用的按鈕，或者在我的屏幕上PRIMEng UI組件......

我在我的控制檯以下消息後來電：

在

ERROR Error: Uncaught (in promise): Unexpected literal at position 2 
    at resolvePromise (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:710:31) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:761:17) [angular] 
    at Object.onInvokeTask (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4322:37) [angular] 
    at drainMicroTaskQueue (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:591:35) [<root>] 
    at HTMLButtonElement.ZoneTask.invoke (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:464:25) [<root>] 
    at ____________________Elapsed_3_ms__At__Fri_May_05_2017_02_45_38_GMT_0300__BRT_ (http://localhost) 
    at getStacktraceWithUncaughtError (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:39:12) [angular] 
    at new LongStackTrace (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:33:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:109:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:274:29) [angular] 
    at scheduleResolveOrReject (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:756:14) [angular] 
    at ZoneAwarePromise.then (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:845:17) [angular] 
    at NgModel._updateValue (eval at <anonymous> (http://localhost:8080/house/vendor.js:72:1), <anonymous>:4434:27) [angular] 
    at NgModel.ngOnChanges (eval at <anonymous> (http://localhost:8080/house/vendor.js:72:1), <anonymous>:4316:18) [angular] 
    at checkAndUpdateDirectiveInline (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:10907:19) [angular] 
    at checkAndUpdateNodeInline (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12289:17) [angular] 
    at checkAndUpdateNode (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12257:16) [angular] 
    at debugCheckAndUpdateNode (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12886:59) [angular] 
    at debugCheckDirectivesFn (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12827:13) [angular] 
    at Object.eval [as updateDirectives] (ng:///AppModule/PatientComponent.ngfactory.js:2577:5) [angular] 
    at Object.debugUpdateDirectives [as updateDirectives] (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12812:21) [angular] 
    at checkAndUpdateView (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12224:14) [angular] 
    at callViewAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12539:17) [angular] 
    at execComponentViewsAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12485:13) [angular] 
    at checkAndUpdateView (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12230:5) [angular] 
    at callViewAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12539:17) [angular] 
    at execComponentViewsAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12485:13) [angular] 
    at checkAndUpdateView (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12230:5) [angular] 
    at callWithDebugContext (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:13212:42) [angular] 
    at Object.debugCheckAndUpdateView [as checkAndUpdateView] (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12752:12) [angular] 
    at ViewRef_.detectChanges (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:10321:63) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5258:63) [angular] 
    at Array.forEach (native) [angular] 
    at ApplicationRef_.tick (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5258:25) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5138:106) [angular] 
    at Object.onInvoke (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4331:37) [angular] 
    at NgZone.run (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4200:62) [angular] 
    at Object.next (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5138:82) [angular] 
    at SafeSubscriber.schedulerFn [as _next] (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4034:52) [angular] 
    at SafeSubscriber.__tryOrUnsub (eval at <anonymous> (http://localhost:8080/house/vendor.js:28:1), <anonymous>:236:16) [angular] 
    at SafeSubscriber.next (eval at <anonymous> (http://localhost:8080/house/vendor.js:28:1), <anonymous>:185:22) [angular] 
    at Subscriber._next (eval at <anonymous> (http://localhost:8080/house/vendor.js:28:1), <anonymous>:125:26) [angular] 
    at Subscriber.next (eval at <anonymous> (http://localhost:8080/house/vendor.js:28:1), <anonymous>:89:18) [angular] 
    at EventEmitter.Subject.next (eval at <anonymous> (http://localhost:8080/house/vendor.js:79:1), <anonymous>:55:25) [angular] 
    at EventEmitter.emit (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4020:76) [angular] 
    at NgZone.checkStable (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4296:40) [angular] 
    at NgZone.onLeave (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4372:14) [angular] 
    at Object.onInvokeTask (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4325:27) [angular] 
    at HTMLButtonElement.ZoneTask.invoke (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:460:38) [<root>] 
    at ____________________Elapsed_18597_ms__At__Fri_May_05_2017_02_45_19_GMT_0300__BRT_ (http://localhost) 
    at getStacktraceWithUncaughtError (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:39:12) [angular] 
    at new LongStackTrace (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:33:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:109:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:274:29) [angular] 
    at zoneAwareAddListener (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:1453:14) [angular] 
    at HTMLButtonElement.addEventListener (eval at createNamedFn (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1)), <anonymous>:3:43) [angular] 
    at DomEventsPlugin.addEventListener (eval at <anonymous> (http://localhost:8080/house/vendor.js:186:1), <anonymous>:3131:17) [angular] 
    at EventManager.addEventListener (eval at <anonymous> (http://localhost:8080/house/vendor.js:186:1), <anonymous>:2477:23) [angular] 
    at EmulatedEncapsulationDomRenderer2.DefaultDomRenderer2.listen (eval at <anonymous> (http://localhost:8080/house/vendor.js:186:1), <anonymous>:2990:36) [angular] 
    at DebugRenderer2.listen (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:13476:30) [angular] 
    at listenToElementOutputs (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:9558:66) [angular] 
    at createViewNodes (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12148:17) [angular] 
    at callViewAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12546:13) [angular] 
    at execComponentViewsAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12485:13) [angular] 
    at createViewNodes (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12203:5) [angular] 
    at callViewAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12546:13) [angular] 
    at execComponentViewsAction (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12485:13) [angular] 
    at createViewNodes (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12203:5) [angular] 
    at createRootView (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12081:5) [angular] 
    at callWithDebugContext (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:13212:42) [angular] 
    at Object.debugCreateRootView [as createRootView] (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:12673:12) [angular] 
    at ComponentFactory_.create (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:10017:46) [angular] 
    at ComponentFactoryBoundToModule.create (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:3633:29) [angular] 
    at ApplicationRef_.bootstrap (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5215:57) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5002:79) [angular] 
    at Array.forEach (native) [angular] 
    at PlatformRef_._moduleDoBootstrap (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:5002:42) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4964:27) [angular] 
    at Object.onInvoke (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4331:37) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:758:57) [angular] 
    at Object.onInvokeTask (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4322:37) [angular] 
    at drainMicroTaskQueue (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:591:35) [<root>] 
    at <anonymous> [<root>] 
    at ____________________Elapsed_62_ms__At__Fri_May_05_2017_02_45_19_GMT_0300__BRT_ (http://localhost) 
    at getStacktraceWithUncaughtError (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:39:12) [angular] 
    at new LongStackTrace (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:33:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:109:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:274:29) [angular] 
    at scheduleResolveOrReject (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:756:14) [angular] 
    at resolvePromise (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:705:21) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:758:17) [angular] 
    at Object.onInvokeTask (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4322:37) [angular] 
    at drainMicroTaskQueue (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:591:35) [<root>] 
    at <anonymous> [<root>] 
    at ____________________Elapsed_4_ms__At__Fri_May_05_2017_02_45_19_GMT_0300__BRT_ (http://localhost) 
    at getStacktraceWithUncaughtError (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:39:12) [angular] 
    at new LongStackTrace (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:33:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2776:1), <anonymous>:109:22) [angular] 
    at Object.onScheduleTask (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:274:29) [angular] 
    at scheduleResolveOrReject (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:756:14) [angular] 
    at ZoneAwarePromise.then (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:845:17) [angular] 
    at new ApplicationInitStatus (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:3120:60) [angular] 
    at AppModuleInjector.createInternal (ng:///AppModule/module.ngfactory.js:167:35) [angular] 
    at AppModuleInjector.NgModuleInjector.create (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:3743:76) [angular] 
    at NgModuleFactory.create (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:3716:18) [angular] 
    at eval (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4954:61) [angular] 
    at Object.onInvoke (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4331:37) [angular] 
    at NgZone.run (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4200:62) [<root>] 
    at PlatformRef_._bootstrapModuleFactoryWithZone (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4952:23) [<root>] 
    at eval (eval at <anonymous> (http://localhost:8080/house/vendor.js:14:1), <anonymous>:4993:59) [<root>] 
    at eval (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:758:57) [<root>] 
    at drainMicroTaskQueue (eval at <anonymous> (http://localhost:8080/house/polyfills.js:2782:1), <anonymous>:591:35) [<root>] 
    at <anonymous> [<root>] 
defaultErrorLogger @ core.es5.js?0445:1290 
ErrorHandler.handleError @ core.es5.js?0445:1350 
next @ core.es5.js?0445:4960 
schedulerFn @ core.es5.js?0445:4034 
SafeSubscriber.__tryOrUnsub @ VM28777:236 
SafeSubscriber.next @ VM28777:185 
Subscriber._next @ VM28777:125 
Subscriber.next @ VM28777:89 
Subject.next @ VM28804:55 
EventEmitter.emit @ core.es5.js?0445:4020 
NgZone.triggerError @ core.es5.js?0445:4391 
onHandleError @ core.es5.js?0445:4352 
ZoneDelegate.handleError @ zone.js?fad3:369 
Zone.runGuarded @ zone.js?fad3:141 
_loop_1 @ zone.js?fad3:602 
drainMicroTaskQueue @ zone.js?fad3:611 
ZoneTask.invoke @ zone.js?fad3:464 
person.component.ts?10bd:76 ' 

Added! Response {_body: null, status: 204, ok: true, statusText: "No Content", headers: Headers…}

注控制檯消息的結尾，我已記錄消息'已添加！'和響應這很好。

如此反覆，爲什麼我沒有需要 stringfy我人對象，甚至也沒有設置 的Content-Type到 應用/ JSON價值，但它得到了由REST端點，它應該明白

只消費應用程序/ json內容？

任何想法？我錯過了什麼？

來源

2017-05-05 skinny_jones

如果跟蹤下來http源代碼

detectContentTypeFromBody方法做內容設置爲您

爲detectContentType方法default情況下，switch

https://github.com/angular/angular/blob/master/packages/http/src/static_request.ts#L135

來源

2017-05-05 06:28:07 echonax

裏面我看到的，所以角正在處理這個問題，讓它休息不是更好嗎？它可能會以錯誤的方式「教導」新手，或者更多的不完整的方式...... –

@skinny_jones我明白你的觀點。但是，一些新手會感到沮喪，並在他們看到紅線時放棄框架。我相信你知道我的意思;） – echonax

爲什麼我不需要JSON.stringify（）這個帖子的有效載荷？

回答

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