SpringMVC注解配置

package com.bookstore.config;

import com.bookstore.interceptor.FirstInterceptor;
import org.apache.logging.log4j.core.tools.picocli.CommandLine;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;
import org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.thymeleaf.spring5.SpringTemplateEngine;
import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;
import org.thymeleaf.templateresolver.ITemplateResolver;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;

import java.util.List;
import java.util.Properties;

/**
 * @Author BaiYZ
 * @Program BookStoreFrameWork
 * @Description SpringMVC配置类
 * 1、扫描组件
 * 2、视图解析器
 * 3、view-controller
 * 4、default-servlet-handler
 * 5、mvc注解驱动
 * 6、文件上传解析器
 * 7、异常处理
 * 8、拦截器
 * @Date 2022-01-03 13:41:45
 */
//配置类
@Configuration
//开启注解扫描
@ComponentScan(value = "com.bookstore", includeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Controller.class)})
//开启mvc注解驱动
@EnableWebMvc
public class SpringMVCConfig implements WebMvcConfigurer {
    // thymeleaf模板引擎参数

    public final static String TEMPLATE_PREFIX = "/WEB-INF/templates/";
    public final static String TEMPLATE_SUFFIX = ".html";
    public final static String TEMPLATE_ENCODING = "UTF-8";
    public final static Boolean TEMPLATE_CACHEABLE = false;
    public final static String TEMPLATE_TYPE = "HTML5";
    public final static Integer TEMPLATE_ORDER = 1;
    //配置生成模板解析器

    @Bean
    public SpringResourceTemplateResolver getTemplateResolver() {
        WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
        // ServletContextTemplateResolver,注入其中的webApplicationContext，可通过WebApplicationContext 的方法获得
        SpringResourceTemplateResolver springResourceTemplateResolver = new SpringResourceTemplateResolver();
        springResourceTemplateResolver.setApplicationContext(webApplicationContext);
        //设置模板解析前缀
        springResourceTemplateResolver.setPrefix(TEMPLATE_PREFIX);
        //设置模板解析后缀
        springResourceTemplateResolver.setSuffix(TEMPLATE_SUFFIX);
        //设置文件编码
        springResourceTemplateResolver.setCharacterEncoding(TEMPLATE_ENCODING);
        //设置是否开启缓存
        springResourceTemplateResolver.setCacheable(TEMPLATE_CACHEABLE);
        //设置模板类型
        springResourceTemplateResolver.setTemplateMode(TEMPLATE_TYPE);
        //设置视图解析器优先级
        springResourceTemplateResolver.setOrder(TEMPLATE_ORDER);
        return springResourceTemplateResolver;
    }
    //生成模板引擎并为模板引擎注入模板解析器（使用接口接受子类模板解析器）

    @Bean
    public SpringTemplateEngine getTemplateEngine(ITemplateResolver templateResolver) {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(templateResolver);
        return templateEngine;
    }
    //生成视图解析器并未解析器注入模板引擎

    @Bean
    public ViewResolver getViewResolver(SpringTemplateEngine templateEngine) {
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
        viewResolver.setCharacterEncoding("UTF-8");
        viewResolver.setTemplateEngine(templateEngine);
        viewResolver.setOrder(1);
        return viewResolver;
    }
    @Bean // 配置JSP视图解析器
    public ViewResolver getViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        resolver.setExposeContextBeansAsAttributes(true);
        resolver.setOrder(10);
        return resolver;
    }

    //启用ViewController视图控制器
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
    }

    //启用默认Servlet handler
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    //配置文件上传解析器

    @Bean
    public MultipartResolver getMultipartResolver(){
        return new CommonsMultipartResolver();
    }

    //配置异常解析器
    @Override
    public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
        //配置默认异常处理解析器
        DefaultHandlerExceptionResolver defaultHandlerExceptionResolver = new DefaultHandlerExceptionResolver();
        resolvers.add(defaultHandlerExceptionResolver);

        //配置自定义异常解析器
        SimpleMappingExceptionResolver simpleMappingExceptionResolver = new SimpleMappingExceptionResolver();
        Properties properties = new Properties();
        //配置处理的异常信息
        properties.setProperty("java.lang.ArithmeticException","error");//设置算数计算异常
        simpleMappingExceptionResolver.setExceptionMappings(properties);
        //配置输出异常
        simpleMappingExceptionResolver.setExceptionAttribute("exception");
        resolvers.add(simpleMappingExceptionResolver);
    }

    //添加拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        FirstInterceptor firstInterceptor = new FirstInterceptor();
        registry.addInterceptor(firstInterceptor).addPathPatterns("/**");
    }

}