SpringMvc教程（2）：bean加载与控制

Bean 是 Spring 装配的组件模型，一切实体类都可以配置成一个 Bean ，进而就可以在任何其他的 Bean 中使用，一个 Bean 也可以不是指定的实体类，这就是抽象 Bean 。

1.加载时排除枚举加载

@ComponentScan({"com.bdbk.service","com.bdbk.dao"})

2.全部加载，然后排除

@ComponentScan(value = "com.bdbk",
                  excludeFilters = @ComponentScan.Filter(
                    type = FilterType.ANNOTATION,
                    classes = {Controller.class} //排除掉controll类的 springmvc 包
                )
            )

3.两个容器加载互不干扰

package com.bdbk.config;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.support.AbstractDispatcherServletInitializer;

public class ServletContainerInitConfig extends AbstractDispatcherServletInitializer {
    @Override
    protected WebApplicationContext createServletApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(SpringMvcConfig.class);
        return ctx;
    }
    @Override
    protected WebApplicationContext createRootApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(SpringConfig.class);
        return ctx;
    }

}

另一种方式简化版

package com.bdbk.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class ServletContainerInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {

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

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

    @Override
    protected String[] getServletMappings() {
        return new String[0];
    }
}