Springboot处理CORS跨域请求的三种方法

/**
 * Created with IDEA
 *
 * @Author Chensj
 * @Date 2020/5/8 10:28
 * @Description xxxx控制层
 * @Version 1.0
 */
@RestController
@CrossOrigin
@RequestMapping("/situation")
public class SituationController extends PublicUtilController {
 
  @Autowired
  private SituationService situationService;
  // log日志信息
  private static Logger LOGGER = Logger.getLogger(SituationController.class);
}

/**
 * Created with IDEA
 *
 * @Author Chensj
 * @Date 2020/5/6 10:01
 * @Description
 * @Version 1.0
 */
@CrossOrigin
public class PublicUtilController {
 
  /**
   * 公共分页参数整理接口
   *
   * @param currentPage
   * @param pageSize
   * @return
   */
  public PageInfoUtil proccedPageInfo(String currentPage, String pageSize) {
 
    /* 分页 */
    PageInfoUtil pageInfoUtil = new PageInfoUtil();
    try {
      /*
       * 将字符串转换成整数,有风险, 字符串为a,转换不成整数
       */
      pageInfoUtil.setCurrentPage(Integer.valueOf(currentPage));
      pageInfoUtil.setPageSize(Integer.valueOf(pageSize));
    } catch (NumberFormatException e) {
    }
    return pageInfoUtil;
  }
 
}

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
/**
 * AJAX请求跨域
 * @author Mr.W
 * @time 2018-08-13
 */
@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {
    static final String ORIGINS[] = new String[] { "GET", "POST", "PUT", "DELETE" };
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods(ORIGINS).maxAge(3600);
    }

@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 {
    }
}