(1)多个springboot项目合并的问题总结

一.不同的包下存在同名的类名问题:

 

 

 1.1 启动过程中的错误:

(类似的其他报错)

Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'nameConflict' for bean class [xom.liuyun.beannameconflict.modelB.NameConflict] conflicts with existing, non-compatible bean definition of same name and class [xom.liuyun.beannameconflict.modelA.NameConflict]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.checkCandidate(ClassPathBeanDefinitionScanner.java:348) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:286) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:132) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:284) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:241) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:198) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:166) ~[spring-context-5.0.4.RELEASE.jar:5.0.4.RELEASE]
... 13 common frames omitted。

 

1.2  报错原因:

  spring提供两种beanName生成策略,基于注解的sprong-boot默认使用的是AnnotationBeanNameGenerator,它生成beanName的策略就是,取当前类名(不是全限定类名)作为beanName。

由此,如果出现不同包结构下同样的类名称,肯定会出现冲突。

 

1.3 解决办法:

 自己写一个类实现 org.springframework.beans.factory.support.BeanNameGeneraot接口

 public class UniqueNameGenerator extends AnnotationBeanNameGenerator {
  
     @Override
     public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) {
         //全限定类名
         String beanName = definition.getBeanClassName();
         return beanName;
     }
}

  在启动类上加注解@ComponentScan(nameGenerator = UniqueNameGenerator.class)使刚才我们自定义的BeanName生成策略生效。

如下:

@SpringBootApplication
@ComponentScan(nameGenerator = UniqueNameGenerator.class)
public class BeanNameConflictApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(BeanNameConflictApplication.class, args);
    }
}

 

二.解决Mybatis提供的@Mapper注入bean的冲突

以上第一部分可以解决@Controller,@Service等Spring提供的bean注入的同名类冲突,@Mapper不是spring的注解,所以以上部分无法解决@Mapper注入bean的类冲突

解决办法:

在启动类上@MapperScan注解加入mapper的包名

@SpringBootApplication
//全限定类名
@ComponentScan(nameGenerator = UniqueNameGenerator.class)
@MapperScan(value={"com.grand.p1upgrade.mapper","com.grand.quickreaction.mapper","com.grand.springboottemplate.app.mapper","com.grand.springboottemplate.environment.mapper"},nameGenerator = UniqueNameGenerator.class)
//@ServletComponentScan
//要将Application类放在最外侧,即包含所有子包 原因:spring-boot会自动加载启动类所在包下及其子包下的所有组件.
public class EnvironmentApplication {

    public static void main(String[] args) {
        SpringApplication.run(EnvironmentApplication.class, args);
    }


    //springcloud-前端跨域问题的解决方案全局配置
    @Bean
    public WebMvcConfigurer corsConfigurer() {
         WebMvcConfigurer webMvcConfigurer = new WebMvcConfigurer() {
             @Override
             public void addCorsMappings(CorsRegistry registry) {
                 registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods("*").maxAge(3600).allowedHeaders("*");
             }
         };
         return webMvcConfigurer;
    }
}

 

 

 
posted @ 2020-07-16 14:37  憨憨青年  阅读(2818)  评论(0编辑  收藏  举报
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