Spring bean加载控制实现方法
给我手牵你走~~ 人气:01. Controller加载控制
因为功能不同,要避免Spring错误的加载到SpringMVC的bean
1.1 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(DataSource等)
SpringMVC相关bean加载控制
- SpringMVC加载的bean对应的包均在com.zhang.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.zhang,排除掉controller包内的bean
- 方式二:Spring加载的bean设定扫描范围为精准范围,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
1.2 加载Spring控制的bean的时候排除掉SpringMVC控制的bean(方式一)
名称:@ComponentScan
类型:类注解
范例
package com.zhang.config; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.FilterType; import org.springframework.stereotype.Controller; @Configuration @ComponentScan(value = "com.zhang", 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)
1.3 验证是否排除成功
创建spring容器加载spring配置文件,然后根据类型获取表现层的bean,如果不能获取则证明加载Spring控制的bean的时候成功排除掉SpringMVC控制的bean;这里值得一提的是,需要把SpringMVCConfig配置类上的@Configuration注释掉;
package com.zhang; import com.zhang.config.SpringConfig; import com.zhang.controller.UserController; import org.springframework.context.annotation.AnnotationConfigApplicationContext; public class App { public static void main(String[] args) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class); UserController userController = context.getBean(UserController.class); System.out.println(userController); } }
1.4 运行结果
证明加载Spring控制的bean的时候成功排除掉SpringMVC控制的bean
2. Bean的加载格式
extends AbstractDispatcherServletInitializer
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[]{"/"}; } }
简化格式
extends AbstractAnnotationConfigDispatcherServletInitializer
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer{ protected Class<?>[] getServletConfigClasses() { return new Class[]{SpringMvcConfig.class} }; protected String[] getServletMappings() { return new String[]{"/"}; } protected Class<?>[] getRootConfigClasses() { return new Class[]{SpringConfig.class}; } }
加载全部内容