springboot 静态资源拦截配置及加上 /static/** 路径放行无效的问题

「爱情、让人受尽委屈。」 2022-09-06 10:21 188阅读 0赞

##### 两个属性spring.mvc.static-path-pattern和spring.resources.static-locations #####

spring.mvc.static-path-pattern:/** (这是源码中的默认值) //设置为/static/**的话 需要在url中请求资源时需要加上/static/才能正常访问, //不设置也可以正常访问

**源码如图:**  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NhY3JlZEZveA_size_16_color_FFFFFF_t_70][]

spring.resources.static-locations= //(设置静态资源的目录,默认值见下图)

springboot会自动按照默认值的顺序优先级查找这几个目录下的静态资源

**源码如图:**

public static class Resources { 
            private static final String[] 
            CLASSPATH_RESOURCE_LOCATIONS = 
            new String[]{ "classpath:/META-INF/resources/", 
            "classpath:/resources/", 
            "classpath:/static/", 
            "classpath:/public/"};
            private String[] staticLocations;
            private boolean addMappings;
            private boolean customized;
            private final WebProperties.Resources.Chain chain;
            private final WebProperties.Resources.Cache cache;
    
            public Resources() { 
           
                this.staticLocations = CLASSPATH_RESOURCE_LOCATIONS;
                this.addMappings = true;
                this.customized = false;
                this.chain = new WebProperties.Resources.Chain();
                this.cache = new WebProperties.Resources.Cache();
            }

//编写了一个拦截器类并重写了preHandle方法
    public class LoginHandlerInterceptor implements HandlerInterceptor { 
    
        @Override
        public boolean preHandle(HttpServletRequest request, 
        HttpServletResponse response, Object handler) throws Exception { 
    
            Object loginUser = request.getSession().getAttribute("loginUser");
            if (loginUser==null){ 
                request.setAttribute("msg","用户不存在请重新登录");
                request.getRequestDispatcher("/index.html").forward(request,response);
                return false;
            }else { 
                return true;
            }
    
        }
    }

//将拦截器通过注解交给容器管理
    @Configuration
    public class MyMvcConfig implements WebMvcConfigurer { 
    
        /*添加Controller映射*/
        @Override
        public void addViewControllers(ViewControllerRegistry registry) { 
            registry.addViewController("/").setViewName("/index");
            registry.addViewController("/index.html").setViewName("/index");
            registry.addViewController("/main.html").setViewName("/dashboard");
        }
    
        /*添加拦截器*/
        @Override
        public void addInterceptors(InterceptorRegistry registry) { 
            String[] str = { "/index.html", "/", "/user/login","/static/**"};
            registry.addInterceptor(new LoginHandlerInterceptor())
                    .addPathPatterns("/**")
                    .excludePathPatterns(str);    //注意排除静态资源路径
        }

`str = {"/index.html", "/", "/user/login","/static/**"}这里 直接添加"/static/**"的话我这里没有生效,因为上面有静态资源目录的默认配置,请求到拦截器这里的时候 springboot还没有将/static/加载到路径上去,没有加载拦截器识别不到,所以没有生效依然访问不到静态资源`

![这里][21a6c5ad7c3e4f53a58c6ddf730d50a6.png]

#### 由于/static/是由springboot自动装载的,拦截器这里想要/static/\*\*路径放行生效的话,可以显式在properties或者yml文件定义 ####

> spring.mvc.static-path-pattern=/static/\*\*

, 或者不定义,在中间加一个显式的文件夹目录(这里命名assert)将静态资源都放入这个中间目录下 拦截器就能识别到了

###### `然后上面str = {"/index.html", "/", "/user/login","/static/**"}中的/static/**修改成/assert/**就可以生效了 达到显式定义static-path-pattern同样的效果` ######

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[21a6c5ad7c3e4f53a58c6ddf730d50a6.png]: /images/20220829/e652099275414b61a205858b23c3247e.png