“入坑记”之-getRequestDispatcher 死循环

try {
    Object user = request.getSession().getAttribute("username");

    if (user == null) {
        request.setAttribute("msg", "无权限，请先登录！");
        response.sendRedirect(request.getContextPath()+"/system/login");
        return false;
    }
} catch (IOException e) {
    e.printStackTrace();
}

@Override
public void addInterceptors(InterceptorRegistry registry) {
    //注册TestInterceptor拦截器
    InterceptorRegistration registration = registry.addInterceptor(new LoginInterceptor());
    registration.addPathPatterns("/**"); // 拦截所有路径
    registration.excludePathPatterns(
            "/**/*.html",
            "/**/*.js",
            "/**/*.css",
            "/**/*.woff",
            "/**/*.ttf"
    );
}

解析

1. 首次登录：http://localhost:8091/system/login
2. 拦截器会拦截/system/login
3.  1-2-1死循环

解决方案

@Override
public void addInterceptors(InterceptorRegistry registry) {
    //注册TestInterceptor拦截器
    InterceptorRegistration registration = registry.addInterceptor(new LoginInterceptor());
    registration.addPathPatterns("/**"); // 拦截所有路径
    registration.excludePathPatterns(
            "/system/**", // 排除system路径下所有文件
            "/**/*.html",
            "/**/*.js",
            "/**/*.css",
            "/**/*.woff",
            "/**/*.ttf"
    );
}

 

​