在Java开发中，实现跨域主要通过以下几种方式： 1. 使用Spring框架的CORSFilter：Spring框架提供了CORSFilter，可以通过配置过滤器来处理跨域请求。 ```java @Bean public CorsFilter corsFilter() { UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(); CorsConfiguration config = new CorsConfiguration(); config.setAllowedOrigins(Arrays.asList("*")); config.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS")); config.setAllowCredentials(true); config.setMaxAge(3600); source.registerCorsConfiguration("/", config); return new CorsFilter(source); } ``` 2. 使用Filter：编写一个Filter来处理跨域请求。 ```java public class CrossOriginFilter implements Filter { @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletResponse responseHeader = (HttpServletResponse) response; responseHeader.setHeader("Access-Control-Allow-Origin", "*"); responseHeader.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE"); responseHeader.setHeader("Access-Control-Max-Age", "3600"); responseHeader.setHeader("Access-Control-Allow-Headers", "x-requested-with"); chain.doFilter(request, response); } } ``` 3. 使用Spring Security：在Spring Security的配置文件中添加跨域配置。 ```java http.headers().frameOptions().sameOrigin(); ``` 4. 使用Nginx：如果后端是Java开发，前端是用Nginx作为反向代理服务器，可以通过Nginx的配置来实现跨域。 ```nginx location / { proxy_pass http://localhost:8080; 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 Access-Control-Allow-Origin *; proxy_set_header Access-Control-Allow-Methods 'GET, POST, OPTIONS'; proxy_set_header Access-Control-Allow-Headers 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type'; proxy_set_header Access-Control-Allow-Credentials true; } ``` 以上就是在Java开发中实现跨域的几种方式。 [2023-11-07 22:22:00 | AI小红书种草文 | 503点数解答]