springboot設置cors跨域請求的兩種方式

一、第一種：

public class CorsFilter extends OncePerRequestFilter {

    static final String ORIGIN = "Origin";

    protected void doFilterInternal(
        HttpServletRequest request, 
        HttpServletResponse response, 
        FilterChain filterChain) throws ServletException, IOException {
    
        String origin = request.getHeader(ORIGIN);
    
        response.setHeader("Access-Control-Allow-Origin", "*");//* or origin as u prefer
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", "PUT, POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "content-type, authorization");
    
        if (request.getMethod().equals("OPTIONS"))
            response.setStatus(HttpServletResponse.SC_OK);
        else 
            filterChain.doFilter(request, response);
    
    }
}

@Bean
public CorsFilter corsFilter() throws Exception {
    return new CorsFilter();
}

http
    .addFilterBefore(corsFilter(), UsernamePasswordAuthenticationFilter.class)
    .addFilterBefore(authenticationTokenFilterBean(), UsernamePasswordAuthenticationFilter.class)
    .headers()
    .cacheControl();

二、第二種：

@Configuration
public class CorsConfig {
    @Bean
    public FilterRegistrationBean corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        // 設置你要容許的網站域名，若是全容許則設爲 *
        config.addAllowedOrigin("http://localhost:4200");
        // 若是要限制 HEADER 或 METHOD 請自行更改
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        source.registerCorsConfiguration("/**", config);
        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
        // 這個順序很重要哦，爲避免麻煩請設置在最前
        bean.setOrder(0);
        return bean;
    }
}

參考：

jwt-spring-security-demo
重拾後端之Spring Boot（五） -- 跨域、自定義查詢及分頁