SpringMVC中bean的加载控制
原创
©著作权归作者所有:来自51CTO博客作者夏志121的原创作品,请联系作者获取转载授权,否则将追究法律责任
Controller加载控制与业务bean加载控制
SpringMVC相关bean(表现层bean)
Spring控制的bean
业务bean(Service)
功能bean(DateSource等)
SpringMVC相关bean加载控制
SpringMVC加载的bean对应的包均在com.itheima.controller包内
Spring相关bean加载控制
方式一:Spring加载的bean设定扫描范围为com.itheima,排除controller包内的bean
方式二:Spring加载的bean设定扫描范围为精准扫描,例如service包、dao包等
方式三:不区分Spring与SpringMVC的环境,加载到同一个环境中
方式一:
名称:@ComponentScan
类型:类注解
范例:
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
@Configuration
//设置spring配置类加载bean时的过滤规则,当前要求排除掉表现层对应的bean
//excludeFilters属性:设置扫描加载bean时,排除的过滤规则
//type属性:设置排除规则,当前使用按照bean定义时的注解类型进行排除
//classes属性:设置排除的具体注解类,当前设置排除@Controller定义的bean
@ComponentScan(value="com.itheima",
excludeFilters = @ComponentScan.Filter(
type = FilterType.ANNOTATION,
classes = Controller.class
)
)
public class SpringConfig {
}
属性:
excludeFilters:排除扫描路径中加载的bean,需要指定类别(type)与具体项(classes)
includeFilters:加载指定的bean,需要指定类别(type)与具体项(classes)
方式三:
bean的加载格式:
public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
protected WebApplicationContext createServletApplicationContext() {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(SpringMvcConfig.class);
return ctx;
}
protected WebApplicationContext createRootApplicationContext() {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(SpringConfig.class);
return ctx;
}
protected String[] getServletMappings() {
return new String[]{"/"};
}
}
简化开发:
//web配置类简化开发,仅设置配置类类名即可
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
protected Class<?>[] getRootConfigClasses() {
return new Class[]{SpringConfig.class};
}
protected Class<?>[] getServletConfigClasses() {
return new Class[]{SpringMvcConfig.class};
}
protected String[] getServletMappings() {
return new String[]{"/"};
}
}