JavaConfig配置SpringMVC加载启动

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本文介绍如何使用JavaConfig启动SpringMVC，通过创建继承自AbstractAnnotationConfigDispatcherServletInitializer的类来完成配置。文中详细展示了RootConfig和WebConfig两个核心配置类的具体实现。

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重要：采用JavaConfig作为SpringMVC的启动配置，必须要有一个类继承AbstractAnnotationConfigDispatcherServletInitializer,且这个类处于项目中任意位置均可

package spittr.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class AppInitializer extends
AbstractAnnotationConfigDispatcherServletInitializer {

@Override
protected Class<?>[] getRootConfigClasses() {
// TODO Auto-generated method stub
return new Class<?>[] { RootConfig.class };
}

@Override
protected Class<?>[] getServletConfigClasses() {
// TODO Auto-generated method stub
return new Class<?>[] { WebConfig.class };
}

@Override
protected String[] getServletMappings() {
// TODO Auto-generated method stub
return new String[] { "/" };
}

}

具体配置

1、RootConfig（非web相关的bean配置）：

package spittr.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

@Configuration
@ComponentScan(basePackages = { "spittr" }, excludeFilters = { @Filter(type = FilterType.ANNOTATION, value = EnableWebMvc.class) })
public class RootConfig {

}

2、WebConfig（web相关的bean配置）：

package spittr.config;

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

@Configuration
// 该类是配置类
@EnableWebMvc
// 启用SpringMvc
@ComponentScan("spittr.web")
// 启用组件扫描，扫描包:spittr.web
public class WebConfig extends WebMvcConfigurerAdapter {

// 配置JSP视图解析器
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}

// 配置静态资源的处理
@Override
public void configureDefaultServletHandling(
DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}

如此即可启动SpringMVC