java如何阻止方法被重定向 java拦截器重定向

说明：当使用拦截器出现“请求转发”无限循环或者“重定向”次数过多这种问题的时候，一般都是 拦截器 设置错了

情况一：请求转发时没有配置排除拦截路径，就是说你访问的路径都拦截了，导致一直转发，从而产生java.lang.StackOverflowError错误

情况二：重定向时没有配置排除拦截路径，会导致一直重定向/重定向次数过多

解决办法：正确添加拦截路径，正确排除拦截路径

Spring Boot中我因疏忽导致的错误(参考):

错误写法：

@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                // addPathPatterns 用于添加拦截规则
                // excludePathPatterns 用于排除拦截
                //注：因为疏忽下方的index.html前面未加/,转发多次-->StackOverflowError
                .addPathPatterns("/**").excludePathPatterns("index.html","/","/login","/user/login",
                "/assets/**","/assets/brand/**","/assets/dist/css/**","/assets/dist/js/**");
    }

正确写法：

自定义的实现了WebMvcConfigurer接口的配置类，并重写addInterceptors方法

@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                // addPathPatterns 用于添加拦截规则
                // excludePathPatterns 用于排除拦截
                .addPathPatterns("/**").excludePathPatterns("/index.html","/","/login","/user/login",
                "/assets/**","/assets/brand/**","/assets/dist/css/**","/assets/dist/js/**");
    }

拦截器:

public class LoginHandlerInterceptor  implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登陆成功之后，获取用户的session
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser==null){//未登录
            System.out.println(request.getRequestURI());
            request.getRequestDispatcher("index.html").forward(request,response);
            // response.sendRedirect("index.html");
            return false;
        }else {
            return true;
        }
    }
}

教训：写代码要细心