zoukankan      html  css  js  c++  java
  • (012)Spring Boot之改变SpringBootApplication注解默认扫描路径

      SpringBootApplication默认扫描当前包以及子包的所有类,如下所示,SpringBootApplication 注解与User在同一级,无法获取User的bean:

      pom.xml

    <?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.edu.spring</groupId>
        <artifactId>springboot</artifactId>
        <version>1.0.0</version>
        <packaging>jar</packaging>
    
        <name>springboot</name>
        <!-- FIXME change it to the project's website -->
        <url>http://www.example.com</url>
        
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>2.1.6.RELEASE</version>
                    <scope>import</scope>
                    <type>pom</type>
                </dependency>
            </dependencies>
        </dependencyManagement>
        
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <maven.compiler.source>1.8</maven.compiler.source>
            <maven.compiler.target>1.8</maven.compiler.target>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
        </dependencies>
    
    </project>
    View Code

      User.java

    package com.edu.spring.user;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class User {
    
    }
    View Code

      App.java

    package com.edu.spring.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ConfigurableApplicationContext;
    
    import com.edu.spring.user.User;
    
    @SpringBootApplication
    public class App 
    {
    
        public static void main( String[] args)
        {
            SpringApplication app=new SpringApplication(App.class);
            ConfigurableApplicationContext context= app.run(args);
            System.out.println(context.getBean(User.class));
            context.close();
        }
    }
    View Code

      目录结构:

       运行结果如下:

      可以通过scanBasePackages指定扫描路径

      App.java,修改为@SpringBootApplication(scanBasePackages={"com.edu.spring"})

    package com.edu.spring.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ConfigurableApplicationContext;
    
    import com.edu.spring.user.User;
    
    @SpringBootApplication(scanBasePackages={"com.edu.spring"})
    public class App 
    {
    
        public static void main( String[] args)
        {
            SpringApplication app=new SpringApplication(App.class);
            ConfigurableApplicationContext context= app.run(args);
            System.out.println(context.getBean(User.class));
            context.close();
        }
    }
    View Code

      运行结果如下:

       exclude和excludeName可以排除掉要扫描的类,如下将不会获取User的bean:

      @SpringBootApplication(scanBasePackages={"com.edu.spring"},exclude=User.class)

      @SpringBootApplication(scanBasePackages={"com.edu.spring"},excludeName="com.edu.spring.user.User")

  • 相关阅读:
    java中关于AtomicInteger的使用
    什么是程序的原子性
    ReadWriteLock ReentrantReadWriteLock
    InputStream转换为String, byte[] data = new byte[1024]详解
    Invalid argument during startup: unknown conf file parameter : requirepass
    ArrayBlockingQueue 阻塞队列和 Semaphore 信号灯的应用
    java并发之同步辅助类CyclicBarrier和CountDownLatch
    CSS学习摘要-定位
    CSS学习摘要-布局
    CSS学习摘要-浮动与清除浮动
  • 原文地址:https://www.cnblogs.com/javasl/p/11918160.html
Copyright © 2011-2022 走看看