我无法从JSONP对Angular2的响应中获得身体数据，但它使用ajax工作。

First, I coded the SERVER using spring-boot, code like these:

首先，我用spring-boot编码服务器，代码如下:

public class App {
@RequestMapping("/")
@ResponseBody
String home(HttpServletRequest request) {
    String aa=request.getParameter("callback");
    System.out.println(request.getParameter("callback"));
    return aa+"({\"text\":\"hello,world\"})";
}
public static void main(String[] args) throws Exception {
    SpringApplication.run(App.class, args);
}}

Second, I coded the FRONT-END with Angular2:

第二，我用Angular2编码前端:

export class HomePage implements OnInit{
  constructor(private jsonp:Jsonp) {
      }
  ngOnInit(): void {
    this.jsonp.get("http://localhost:8080/callback=JSONP_CALLBACK")
      .subscribe(res=>console.log(this.res);    
  );    
}}

then, I run the front-end in ng-serve, and got the infomation from console:

然后，我在ng服务中运行前端，并从控制台获得信息:

Response {_body: Object, status: 200, ok: true, statusText: "Ok", headers: Headers…}

obviously, the "_body: Object" has the data I want, and in actual, the data looks like:

显然，“_body: Object”有我想要的数据，在实际中，数据看起来是这样的:

{"text":"hello,world"}

so i tried to get the data, but Observable's operator "subscribe" only has these method: click here

所以我试着获取数据，但可观察的操作员“订阅”只有这些方法:点击这里。

so i selected the json method, but i got these from console:

所以我选择了json方法，但是我从控制台得到这些:

function () {
        if (typeof this._body === 'string') {
            return JSON.parse(/** @type {?} */ (this._body));
        }
        if (this._body instanceof ArrayBuffer) {
            return …

I had tried every method, but cannot get the body data, except this weird approach:

我试过了所有方法，但都无法得到身体数据，除了这个奇怪的方法:

console.log(res._body.text);

of course, it has compile error, but I do get the data:click here

当然，它有编译错误，但我确实得到了数据:点击这里。

All the problems above are not appeared when I tried this by using AJAX, I can easily get the data like this

当我使用AJAX进行尝试时，上面的所有问题都没有出现，我可以很容易地得到这样的数据。

jQuery(document).ready(function(){ 
    $.ajax({
         type: "get",
         async: false,
         url: "http://localhost:8080/",
         dataType: "jsonp",
         jsonp: "callback",
         jsonpCallback:"JSONP_CALLBACK",
         success: function(json){
             console.log(json.text);
         },
         error: function(){
             alert('fail');
         }
     });
 });

So, how can I get the json data with rxjs's Observable in Angular2, or is this a bug?

那么，如何在Angular2中使用rxjs的可观察值来获取json数据呢，或者这是一个bug?

1 个解决方案

#1

You should just be able to map response as JSON:

您应该能够将响应映射为JSON:

this.jsonp.get("http://localhost:8080/callback=JSONP_CALLBACK")
  .map(res => res.json())
  .subscribe(data => console.log(data));