我已经创建了两个Web应用程序-客户端和服务应用程序。
当客户端和服务应用程序部署在同一Tomcat实例中时，它们之间的交互就很好。
但是，当将应用程序部署到单独的Tomcat实例（不同的计算机）中时，请求发送服务应用程序时出现以下错误。

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. 
Origin 'http://localhost:8080' is therefore not allowed access. The response had HTTP status code 401

我的客户端应用程序使用JQuery，HTML5和Bootstrap。

如下所示进行AJAX呼叫服务：

var auth = "Basic " + btoa({usname} + ":" + {password});
var service_url = {serviceAppDomainName}/services;

if($("#registrationForm").valid()){
    var formData = JSON.stringify(getFormData(registrationForm));
    $.ajax({
        url: service_url+action,
        dataType: 'json',
        async: false,
        type: 'POST',
        headers:{
            "Authorization":auth
        },
        contentType: 'application/json',
        data: formData,
        success: function(data){
            //success code
        },
        error: function( jqXhr, textStatus, errorThrown ){
            alert( errorThrown );
        });
}

我的服务应用程序使用Spring MVC，Spring Data JPA和Spring Security。

我包含了CorsConfiguration如下所示的类：

CORSConfig.java：

@Configuration
@EnableWebMvc
public class CORSConfig extends WebMvcConfigurerAdapter  {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("*");
    }
}

SecurityConfig.java：

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true)
@EnableWebSecurity
@ComponentScan(basePackages = "com.services", scopedProxy = ScopedProxyMode.INTERFACES)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    @Qualifier("authenticationService")
    private UserDetailsService userDetailsService;

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService);
        auth.authenticationProvider(authenticationProvider());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
       http
                .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().fullyAuthenticated();
        http.httpBasic();
        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);
        http.csrf().disable();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public DaoAuthenticationProvider authenticationProvider() {
        DaoAuthenticationProvider authenticationProvider = new DaoAuthenticationProvider();
        authenticationProvider.setUserDetailsService(userDetailsService);
        authenticationProvider.setPasswordEncoder(passwordEncoder());
        return authenticationProvider;
    }
}

Spring Security依赖项：

 <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>3.2.3.RELEASE</version>
</dependency>
<dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>3.2.3.RELEASE</version>
</dependency>

我正在使用Apache Tomcat服务器进行部署。