首先，我已经在this page上检查了这个问题，我尝试了他的解决方案，但最后，我仍然有同样的问题。
XMLHttpRequest无法加载http://localhost:8080/login。对预处理请求的响应未通过访问控制检查：请求的资源上不存在“Excell-Control-Allow-Origin”标头。因此不允许访问Origin http://localhost:3000。响应的HTTP状态代码为403。
但是，我把一个access-control到处所以我不明白为什么它是这样的。
我的代码看起来像这样（我希望我能为你写得足够多）：
在Angular中，我的login.service.ts：

check(name: string, password: string): boolean {
     let headers = new Headers();
    headers.append('Content-Type', 'application/x-www-form-urlencoded');
    headers.append('Access-Control-Allow-Origin','*');
    let options = new RequestOptions({headers:headers,withCredentials:true});
    if(this.http.post(this.baseUrl, 
        `username=${name}&password=${password}`,
        {headers:headers})
        .toPromise().then(response=> {
          return {}
        }))
        return true;    
        return false;
  }

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如果认证成功，我还想返回一个布尔值，但我真的不知道如何知道它是否有效，所以我现在这样做（它总是为真）。
在Java中，我有这样的代码：

@Configuration
@EnableWebMvc
class WebConfig extends WebMvcConfigurerAdapter {
}

型
为了安全起见，我买了这个

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    
    
    @Autowired
    private RESTLoginSuccessHandler loginSuccessHandler;
    @Autowired
    private RestLogoutSuccessHandler logoutSuccessHandler;
    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        //deactivate CSRF and use custom impl for CORS
        httpSecurity
                .cors.and()
                .csrf().disable()
                .addFilterBefore(new CorsFilter(), ChannelProcessingFilter.class);
        //authorize, authenticate rest
        httpSecurity
                .authorizeRequests()
                    .anyRequest().hasRole("USER")
                    .and()
                .sessionManagement()
                    .sessionCreationPolicy(SessionCreationPolicy.IF_REQUIRED)
                    .and()
                .formLogin()
                    .usernameParameter("username")
                    .passwordParameter("password")
                    .loginPage("/login")
                    .successHandler(loginSuccessHandler)
                    .permitAll()
                    .and()
                .logout()
                    .logoutSuccessHandler(this.logoutSuccessHandler)
                    .permitAll();
    }
    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication().withUser("rano").password("1234").roles("USER");
        auth.inMemoryAuthentication().withUser("admin").password("admin").roles("USER", "ADMIN");
    }
}
@Bean
CorsConfigurationSource corsConfigurationSource() {
    CorsConfiguration configuration = new CorsConfiguration();
    
    configuration.setAllowedOrigins(Arrays.asList("http://localhost:8080","http://localhost:3000"));
        
    configuration.setAllowedMethods(Arrays.asList("PUT","DELETE","POST"));
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", configuration);
    return source;
}

型
在我的登录页面中：

@Component
public class RESTLoginSuccessHandler extends SimpleUrlAuthenticationSuccessHandler {
    private RequestCache requestCache = new HttpSessionRequestCache();
    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
            org.springframework.security.core.Authentication authentication) throws IOException, ServletException {
        SavedRequest savedRequest = requestCache.getRequest(request, response);
        if (savedRequest == null) {
            clearAuthenticationAttributes(request);
            return;
        }
        String targetUrlParam = getTargetUrlParameter();
        if (isAlwaysUseDefaultTargetUrl()
                || (targetUrlParam != null && StringUtils.hasText(request.getParameter(targetUrlParam)))) {
            requestCache.removeRequest(request, response);
            clearAuthenticationAttributes(request);
            return;
        }
        clearAuthenticationAttributes(request);
    }
    public void setRequestCache(RequestCache requestCache) {
        this.requestCache = requestCache;
    }
}

型
那么，有什么问题吗？或者如何使用Sping Boot 和Spring Security制作Angular2应用程序？因为除了添加安全性之外，Sping Boot 和Angular之间的所有功能都可以正常工作。