SpringMVC笔记——SpringMVC配置类取代xml配置

什么是SpringMVC配置类

SpringMVC配置类是一个用来配置SpringMVC的类，它通常包含了一些SpringMVC的基本设置，例如视图解析器、拦截器、消息转换器等。

1.创建SpringConfig

---

@Configuration  
public class SpringConfig {  
}
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2.创建SpringMVC初始类（代替web.xml)

---

初始类需要继承 AbstractAnnotationConfigDispatcherServletInitializer

public class WebInit extends AbstractAnnotationConfigDispatcherServletInitializer {
    /**
     * 指定spring的配置文件
     * @return
     */
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

    /**
     * 指定SpringMVC的配置文件
     * @return
     */
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebConfig.class};
    }

    /**
     * 指定Mapping映射规则
     * @return
     */
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
    /**
     * 注册过滤器
     * @return Filter[]
     */
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
        characterEncodingFilter.setEncoding("UTF-8");
        characterEncodingFilter.setForceEncoding(true);
        HiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter();
        return new Filter[] {characterEncodingFilter, hiddenHttpMethodFilter};
    }
}
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3. 创建SpringMVC配置类（代替SpringMVC.xml）

// 标识为配置类  
@Configuration  
// 扫描控制层  
@ComponentScan(basePackages = "com.zxb.controller")  
public class WebConfig {  
  
    // 配置生成模板解析器  
    @Bean  
    public ITemplateResolver templateResolver() {  
        WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();  
        // ServletContextTemplateResolver需要一个ServletContext作为构造参数，可通过WebApplicationContext 的方法获得  
        ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver(  
                webApplicationContext.getServletContext());  
        templateResolver.setPrefix("/WEB-INF/templates/");  
        templateResolver.setSuffix(".html");  
        templateResolver.setCharacterEncoding("UTF-8");  
        templateResolver.setTemplateMode(TemplateMode.HTML);  
        return templateResolver;  
    }  
  
    //生成模板引擎并为模板引擎注入模板解析器  
    @Bean  
    public SpringTemplateEngine templateEngine(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 viewResolver(SpringTemplateEngine templateEngihgne) {  
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();  
        viewResolver.setCharacterEncoding("UTF-8");  
        viewResolver.setTemplateEngine(templateEngine);  
        return viewResolver;  
    }  
}
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