Java Web跨域

方法一，适合基本项目

// 跨域相关
@Order(1)
//重点
@WebFilter(filterName = "corsFilter", urlPatterns = {"/*"})
public class CORSFilter implements Filter{
     
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("初始化filter==========================");
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin", "*"); //  这里最好明确的写允许的域名
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type,Access-Token,Authorization,ybg");
        filterChain.doFilter(servletRequest, servletResponse);
        System.out.println("filter==========================");
    }
    @Override
    public void destroy() {
        System.out.println("销毁filter==========================");
    }
}

方法二，适合Spring MVC

@Configuration
public class CrossConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedMethods("GET","HEAD","POST","PUT","DELETE","OPTIONS")
                .allowCredentials(true)
                .maxAge(3600)
                .allowedHeaders("*");
    }
}

方法三 适合spring boot

@Configuration
public class GlobalCorsConfig {

    @Bean
    public CorsWebFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedMethod("*");
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.setAllowCredentials(true);
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
        source.registerCorsConfiguration("/**", config);

        return new CorsWebFilter(source);
    }

}