SpringBoot实战笔记：09_SpringMVC的静态资源映射

SpringMVC的静态资源映射

程序的静态文件（js,css,图片）等需要直接访问的话，如下配置。

1，创建目录resources/assets/js

2，修改MyMvcConfig配置文件

package com.zyf.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

/**
 * Created by zyf on 2018/3/5.
 */
@Configuration
@EnableWebMvc
@ComponentScan("com.zyf")
public class MyMvcConfig extends WebMvcConfigurerAdapter{

    /**
     *
     * @returnInternalResourceViewResolver 是SpringMVC视图渲染的核心机制
     */
    @Bean
    public InternalResourceViewResolver viewResolver(){
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        //jsp页面前缀
        viewResolver.setPrefix("/WEB-INF/classes/views/");
        //后缀
        viewResolver.setSuffix(".jsp");
        viewResolver.setViewClass(JstlView.class);
        return viewResolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //addResourceHandler指的是对外暴露的访问路径
        //addResourceLocations指的是文件放置的目录
        registry.addResourceHandler("/assets/**").addResourceLocations("classpath:/assets/");
    }
}

2，SpringMVC的拦截器配置

• 拦截器实现对每一个请求处理前后进行相关的业务处理。
• 可让普通的Bean实现 HanlderInterceptor 接口或者继承 HandlerInterceptorAdapter 类来实现自定义拦截器

1，创建ShowInterceptor类

package com.zyf.interceptor;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Created by zyf on 2018/3/5.
 */
public class ShowInterceptor extends HandlerInterceptorAdapter {


    public ShowInterceptor() {
        System.out.println("创建了一个------");
    }

    /**
     * 请求前执行
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("请求之前");
        return true;//放行
    }

    /**
     * 请求后执行
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("请求之后");
    }
}

2，将该类，作为Bean配置在在MyMvcConfig配置类中

    @Bean
    public ShowInterceptor showInterceptor(){
        return new ShowInterceptor();
    }

3，在MyMvcConfig配置类中复写方法注册该拦截器

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(showInterceptor());
    }

4，部署项目访问index