springboot 允许跨域

设置跨域拦截器

1. 在拦截器包下创建跨域拦截器

/**
 * 跨域拦截器
 */
@Component
public class CROSInterceptor implements HandlerInterceptor {
    /**
     * 进入controller层之前拦截请求
     * @param httpServletRequest
     * @param httpServletResponse
     * @param o
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        Object host = httpServletRequest.getHeader("host");
        String origin = httpServletRequest.getHeader("Origin");
        if (origin == null){
            return true;
        }
        httpServletResponse.setHeader("Access-Control-Allow-Origin", origin);
        //httpServletResponse.setHeader("Access-Control-Allow-Methods", "*");填写*号，delete等好像不可用
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,DELETE,PUT,OPTIONS,PATCH");
        httpServletResponse.setHeader("Access-Control-Allow-Headers","Origin,Content-Type,Accept,token,X-Requested-With");
        httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
        System.out.println("---------------------开始进入请求地址拦截----------------------------"+host+"==="+origin);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
//        System.out.println("--------------处理请求完成后视图渲染之前的处理操作---------------");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
//        System.out.println("---------------视图渲染之后的操作-------------------------0");
    }

}

2. 注册拦截器 全局使用

/**
 * 注册拦截器
 */
@Configuration
public class WebAppConfig implements WebMvcConfigurer {
    @Autowired
    private CROSInterceptor crosInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(crosInterceptor).addPathPatterns("/**");
    }
}

3. 项目结构

   
   
   在这里插入图片描述