First Spring

建立一個Spring Web Application，首先要將Spring環境建立好，後續即可使用Tomcat等應用伺服器開啟！

Servlet Initializer

public class ServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] {WebConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

}

Servlet Config

@Configuration
@EnableWebMvc
@ComponentScan({"com.andy.example.*"})
public class ServletConfig extends WebMvcConfigurerAdapter {

    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setViewClass(JstlView.class);
        viewResolver.setPrefix("/WEB-INF/views/");
        viewResolver.setSuffix(".jsp");
        return viewResolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**").addResourceLocations("/resources/"); 
    }

}

這邊將web.xml改為使用JavaConfig設定，web.xml其實就是Spring對於Servlet的設定，這邊設定好後，大家可以嘗試運行看看是否設定成功。