springboot解决跨域问题的方式

Love The Way You Lie 2022-11-06 05:59 193阅读 0赞

由于目前多数的项目都是采用前后端分离的设计方式，所以不可避免的就要在后端系统上设置跨域配置，否则前端调用接口时就很容易报跨域的错误，这里总结两种springboot的跨域配置方式

方式一： 采用过滤器：

import org.springframework.core.annotation.Order;
    import org.springframework.stereotype.Component;
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    
    /**
     * 自定义拦截器
     *
     * @author lvhuimin
     * @version 2019/12/21
     */
    @Order(1)
    @Component
    @WebFilter(urlPatterns = "/*", filterName = "cooCorsFilter")
    public class CooCorsFilter implements Filter {
    
        String ORIGIN = "Origin";
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
    
        }
    
        @Override
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
            HttpServletRequest httpRequest = (HttpServletRequest) request;
            HttpServletResponse httpResponse = (HttpServletResponse) response;
            String origin = httpRequest.getHeader(ORIGIN);
    
            httpResponse.setCharacterEncoding("UTF-8");
            httpResponse.setContentType("application/json; charset=utf-8");
            httpResponse.setHeader("Access-Control-Allow-Origin", origin);
            httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
            httpResponse.setHeader("Access-Control-Allow-Methods", "*");
            // 如果允许所有header,就用*
            httpResponse.setHeader("Access-Control-Allow-Headers", "Content-Type,Authorization,token,userId,sysCode,requestSourceType");
            httpResponse.setHeader("Access-Control-Expose-Headers", "*");
            filterChain.doFilter(httpRequest, httpResponse);
        }
    
        @Override
        public void destroy() {
    
        }
    
    }

方式二： 使用  WebMvcConfigurer

import com.fasterxml.jackson.databind.DeserializationFeature;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.http.converter.HttpMessageConverter;
    import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
    import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
    import org.springframework.web.cors.CorsConfiguration;
    import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
    import org.springframework.web.filter.CorsFilter;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    @Configuration
    public class WebMvcConfig implements WebMvcConfigurer {
    
        //解决跨域问题
        @Bean
        public CorsFilter corsFilter() {
            UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
            source.registerCorsConfiguration("/**", buildConfig());
            return new CorsFilter(source);
        }
    
        private CorsConfiguration buildConfig() {
            CorsConfiguration corsConfiguration = new CorsConfiguration();
            corsConfiguration.addAllowedOrigin("*");
            corsConfiguration.setAllowCredentials(true);
            corsConfiguration.addAllowedHeader("*");
            corsConfiguration.addAllowedMethod("*");
    
            return corsConfiguration;
        }
    
        @Override
        public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
            ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().build();
            objectMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
            converters.add(new MappingJackson2HttpMessageConverter(objectMapper));
        }
    }

好了，希望对大家有帮助，期待关注点赞加分享