1.解決方案一：在Controller上新增@CrossOrigin註解

// 註解方式  
@CrossOrigin 
@RestController  
public class LoginController {  
      
     //方法上加入註解
    @CrossOrigin(allowCredentials="true", allowedHeaders="*", methods={RequestMethod.GET,  
            RequestMethod.POST, RequestMethod.DELETE, RequestMethod.OPTIONS,  
            RequestMethod.HEAD, RequestMethod.PUT, RequestMethod.PATCH}, origins="*")  
    @PostMapping("/confirm")  
    public Response handler(@RequestBody Request json){  
          
        return null;  
    }  
}  
 

解決方案二：全域性配置

專案全域性配置

    @Configuration  
 public class MyWebConfiguration {  
  
        @Bean  
        public WebMvcConfigurer corsConfigurer() {  
            return new WebMvcConfigurerAdapter() {  
                @Override  
                public void addCorsMappings(CorsRegistry registry) {  
                    registry.addMapping("/**")  
                    .allowCredentials(true)  
                    .allowedMethods("*");  
                }  
            };  
        }  
    }  
 

解決方案三：通過攔截器/過濾器實現跨域

在spring boot的主類中，增加一個CorsFilter

 @Bean  
public CorsFilter corsFilter() {  
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();  
        final CorsConfiguration config = new CorsConfiguration();  
        config.setAllowCredentials(true); // 允許cookies跨域  
        config.addAllowedOrigin("*");// #允許向該伺服器提交請求的URI，*表示全部允許，在SpringMVC中，如果設成*，會自動轉成當前請求頭中的Origin  
        config.addAllowedHeader("*");// #允許訪問的頭資訊,*表示全部  
        config.setMaxAge(18000L);// 預檢請求的快取時間（秒），即在這個時間段裡，對於相同的跨域請求不會再預檢了  
        config.addAllowedMethod("OPTIONS");// 允許提交請求的方法，*表示全部允許  
        config.addAllowedMethod("HEAD");  
        config.addAllowedMethod("GET");// 允許Get的請求方法  
        config.addAllowedMethod("PUT");  
        config.addAllowedMethod("POST");  
        config.addAllowedMethod("DELETE");  
        config.addAllowedMethod("PATCH");  
        source.registerCorsConfiguration("/**", config);  
        return new CorsFilter(source);  
    }  
 

或者實現自定義的CorsFilter

@Component
public class CrosFilter implements Filter {
 
    /**
     * 跨域配置
     *
     * @param req http請求
     * @param res http響應
     * @param chain 責任鏈
     * @throws IOException IO異常
     * @throws ServletException Servlet異常
     */
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, token, language");
        chain.doFilter(req, res);
    }
 
    /**
     * 初始化配置
     *
     * @param filterConfig 初始化配置引數
     */
    public void init(FilterConfig filterConfig) {
    }
 
    /**
     * 配置銷燬
     */
    public void destroy() {
    }
}