1、Nginx配置跨域:

server {
    listen 80;
 
    server_name your-backend-service.com;
 
    location / {
        proxy_pass http://localhost:8080; # Spring Boot应用的内部地址
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
 
        # 添加CORS头部允许指定域名
        add_header 'Access-Control-Allow-Origin' 'http://example.com';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
 
        # 预检请求响应
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' 'http://example.com';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain charset=UTF-8';
            add_header 'Content-Length' 0;
            return 204;
        }
    }
}

#Access-Control-Allow-Origin:指定允许跨域请求的源。可以是具体的域名(如http://example.com),或者使用*表示允许所有源。但是,当需要携带凭证(如Cookies)时,必须指定具体的域名。
#Access-Control-Allow-Methods:列出允许的HTTP方法,如GET、POST、PUT、DELETE、OPTIONS等。
#Access-Control-Allow-Headers:指定允许在请求中使用的自定义头部,如Content-Type、#Authorization等。
#Access-Control-Allow-Credentials:如果设置为true,则允许跨域请求携带凭证(如Cookies)。当设置此选项时,Access-Control-Allow-Origin不能设置为*,必须指定具体的域名。
#Access-Control-Max-Age:指定预检请求的有效期(以秒为单位),在有效期内,浏览器不会再次发送预检请求。

2、实现WebMvcConfigurer 

package com.hmmy.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpHeaders;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig implements WebMvcConfigurer {


    /**
     * 跨域处理
     */
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {

            @Override
            public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {

            }

//            @Override
//            public void addResourceHandlers(ResourceHandlerRegistry registry) {
//                registry.addResourceHandler("/**")
//                        .addResourceLocations("classpath:/resources/","classpath:/static/","classpath:/META-INF/resources/");
                        .addResourceLocations("file:C:/Picture/323223618780001/");   /** windows 系统配置路径*/
                        .addResourceLocations("file:/home/java/");   /** linux 系统配置路径*/
//            }

            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").
                        allowedOrigins("*"). //允许跨域的域名,可以用*表示允许任何域名使用
                        allowedMethods("*"). //允许任何方法(post、get等)
                        allowedHeaders("*"). //允许任何请求头
                        allowCredentials(true). //带上cookie信息
                        exposedHeaders(HttpHeaders.SET_COOKIE).maxAge(3600L); //maxAge(3600)表明在3600秒内,不需要再发送预检验请求,可以缓存该结果
            }
        };
    }
}

3、使用拦截器

@Component
public class CorsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse res = (HttpServletResponse) response;
        res.addHeader("Access-Control-Allow-Credentials", "true");
        res.addHeader("Access-Control-Allow-Origin", "*");
        res.addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
        res.addHeader("Access-Control-Allow-Headers", "Content-Type,X-CAF-Authorization-Token,sessionToken,X-TOKEN");
        if (((HttpServletRequest) request).getMethod().equals("OPTIONS")) {
            response.getWriter().println("ok");
            return;
        }
        chain.doFilter(request, response);
    }
    @Override
    public void destroy() {
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
}

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