我将数据保存到 session 中，但随后我尝试将其读回，结果为空。 Spring MVC 是我的后端，Angular 4 是前端。
Java:
@RestController
@CrossOrigin(origins = "http://localhost:3009", allowCredentials = "true")
@RequestMapping(value = "api")
public class RestController {
@Autowired
MainLogic mainLogic;
@RequestMapping(value = "/data", method = RequestMethod.GET)
public List<Data> getData(HttpServletRequest httpServletRequest){
// user is null here )-:
User user = (User)httpServletRequest.getSession().getAttribute("user");
if (user == null) {
return null;
}
return mainLogic.getData();
}
@RequestMapping(value = "/login", method = RequestMethod.POST)
public LoginResult logIn(HttpServletRequest httpServletRequest, @RequestParam("username") String username, @RequestParam("password") String password){
LoginResult result = mainLogic.logIn(username, password);
if (result.getUser() != null) {
// user is not null here
httpServletRequest.getSession().setAttribute("user", result.getUser());
}
return result;
}
}
Angular :
logIn(username: string, password: string): Observable<LoginResult>{
let result = this.http
.post(`${this.baseUrl}/login?username=${username}&password=${password}` , {headers: configuration.getHeaders(), withCredentials: true})
.map(response => response.json());
return result;
}
getData(): Observable<Affiliate[]>{
let results = this.http
.get(`${this.baseUrl}/data`, {headers: configuration.getHeaders(), withCredentials: true})
.map(response => response.json());
return results;
}
知道我在这里缺少什么吗？也许与 CORS 有关？
最佳答案
你能检查一下cookies是否被启用吗？
关于javascript - session 奇怪地返回 null，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45733223/