public interface WebMvcConfigurer {
    default void configurePathMatch(PathMatchConfigurer configurer) {
    }
    default void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
    }
    default void configureAsyncSupport(AsyncSupportConfigurer configurer) {
    }
    default void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    }
    default void addFormatters(FormatterRegistry registry) {
    }
    default void addInterceptors(InterceptorRegistry registry) {
    }
    default void addResourceHandlers(ResourceHandlerRegistry registry) {
    }
    default void addCorsMappings(CorsRegistry registry) {
    }
    default void addViewControllers(ViewControllerRegistry registry) {
    }
    default void configureViewResolvers(ViewResolverRegistry registry) {
    }
    default void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
    }
    default void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> handlers) {
    }
    default void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    }
    default void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
    }
    default void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
    }
    default void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
    }
    @Nullable
    default Validator getValidator() {
        return null;
    }
    @Nullable
    default MessageCodesResolver getMessageCodesResolver() {
        return null;
    }
}

public class CorsRegistry {
    private final List<CorsRegistration> registrations = new ArrayList();
    public CorsRegistry() {
    }
    public CorsRegistration addMapping(String pathPattern) {
        CorsRegistration registration = new CorsRegistration(pathPattern);
        this.registrations.add(registration);
        return registration;
    }
    protected Map<String, CorsConfiguration> getCorsConfigurations() {
        Map<String, CorsConfiguration> configs = CollectionUtils.newLinkedHashMap(this.registrations.size());
        Iterator var2 = this.registrations.iterator();
        while(var2.hasNext()) {
            CorsRegistration registration = (CorsRegistration)var2.next();
            configs.put(registration.getPathPattern(), registration.getCorsConfiguration());
        }
        return configs;
    }
}

public class CorsRegistration {
    private final String pathPattern;
    private CorsConfiguration config;
    public CorsRegistration(String pathPattern) {
        this.pathPattern = pathPattern;
        this.config = (new CorsConfiguration()).applyPermitDefaultValues();
    }
    public CorsRegistration allowedOrigins(String... origins) {
        this.config.setAllowedOrigins(Arrays.asList(origins));
        return this;
    }
    public CorsRegistration allowedOriginPatterns(String... patterns) {
        this.config.setAllowedOriginPatterns(Arrays.asList(patterns));
        return this;
    }
    public CorsRegistration allowedMethods(String... methods) {
        this.config.setAllowedMethods(Arrays.asList(methods));
        return this;
    }
    public CorsRegistration allowedHeaders(String... headers) {
        this.config.setAllowedHeaders(Arrays.asList(headers));
        return this;
    }
    public CorsRegistration exposedHeaders(String... headers) {
        this.config.setExposedHeaders(Arrays.asList(headers));
        return this;
    }
    public CorsRegistration allowCredentials(boolean allowCredentials) {
        this.config.setAllowCredentials(allowCredentials);
        return this;
    }
    public CorsRegistration maxAge(long maxAge) {
        this.config.setMaxAge(maxAge);
        return this;
    }
    public CorsRegistration combine(CorsConfiguration other) {
        this.config = this.config.combine(other);
        return this;
    }
    protected String getPathPattern() {
        return this.pathPattern;
    }
    protected CorsConfiguration getCorsConfiguration() {
        return this.config;
    }
}

/**
 * 配置前端跨域訪問(wèn)請(qǐng)求
 */
@Configuration
public class WbMvcConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
       registry.addMapping("/**")
               .allowedHeaders("Content-Type","X-Request-With","Access-Control-Request-Method","Access-Control-Request-Headers","token")
               .allowedMethods("*")
               .allowedOriginPatterns("*")
               /*注意當(dāng)這個(gè)配置為真是我們不能將允許源設(shè)置為*而是將源路徑設(shè)置為*即可*/
               .allowCredentials(true);
    }
    @Bean
    public FormContentFilter httpPutFormContentFilter(){
        return new FormContentFilter();
    }
}

    <input type="button" value="get" class="get">
    <script>
        document.querySelector(".get").onclick = function () {
            // 跨域一般是是后端解決的事情
            axios.get("http://127.0.0.1:8080/all").then(
                function (response) {
                    console.log(response)
                }
            )
        }
    </script>

@RestController
public class testController {
    @Autowired
    private ProductServiceImpl productService;
    @GetMapping("/all")
    @ResponseBody
    public List<Product> all() {
        Page<Product> page = productService.page(1L);
        List<Product> productList = new LinkedList<>();
        productList.add(page.getRecords().iterator().next());
        return productList;
    }
}