import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 
 * 跨域过滤器
 * @author meng
 * @version 
 * @since 2016年6月19日
 */
@Component
public class CorsFilter implements Filter {

final static org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CorsFilter.class);



public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
 HttpServletResponse response = (HttpServletResponse) res;
 response.setHeader("Access-Control-Allow-Origin", "*");
 response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
 response.setHeader("Access-Control-Max-Age", "3600");
 response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Content-Type");
 System.out.println("*********************************过滤器被使用**************************");
 chain.doFilter(req, res);
 }
 public void init(FilterConfig filterConfig) {}
 public void destroy() {}
}

第二种方法，在Appplication.java添加：

private CorsConfiguration buildConfig() {
 CorsConfiguration corsConfiguration = new CorsConfiguration();
 corsConfiguration.addAllowedOrigin("*");
 corsConfiguration.addAllowedHeader("*");
 corsConfiguration.addAllowedMethod("*");
 return corsConfiguration;
 }
 
 /**
 * 跨域过滤器
 * @return
 */
 @Bean
 public CorsFilter corsFilter() {
 UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
 source.registerCorsConfiguration("/**", buildConfig()); // 4
 return new CorsFilter(source);
 }