一)spring-boot-starter命名规则

自动配置模块命名规则:xxx-spring-boot,如:aspectlog-spring-boot

启动器命名规则:xxx-spring-boot-starter,如:aspectlog-spring-boot-starter

如两者只有一个模块:建议以xxx-spring-boot-starter方式命名。

springboot建议以xxx前缀的方式对自己的自动配置命名的。

 

二)spring-boot-starter条件注解

注解 说明
@ConditionalOnClass 指定加载的类
@ConditionalOnMissingClass 指定不加载的类
@ConditionalOnBean 指定需要加载的bean
@ConditionalOnMissingBean 指定不需要加载的bean
@ConditionalOnProperty 指定加载配置文件中的属性,如yml或properties文件
@ConditionalOnResource 检查特定的资源是否存在,如:file:/home/user/test.dat
@ConditionalOnExpression 使用SpEL表达式

该文章使用@ConditionalOnProperty注解实现。

 

三)创建自己的aspectlog-spring-boot-starter日志打印自动配置模块

第一步:创建一个aspectlog-spring-boot-starter名称的maven项目

在pom.xml文件中引入springboot相应jar

<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.oysept</groupId>
    <artifactId>aspectlog-spring-boot-starter</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    
    <!-- springboot版本信息 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
    </parent>
    
    <properties>
        <java.version>1.8</java.version>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
		
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
		
        <!-- 自定义配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>

spring-boot-configuration-processor作用:会在源数据文件(META-INF/spring-autoconfigure-metadata.properties)中自动扫描加载和自动配置有关的条件。也就是说,当编写starter时,会读取自动配置的条件,写入源数据文件中。

 

第二步:定义一个AspectLog注解类

该注解作用于方法上,并在运行时启用

package com.oysept.autoconfiguration.aspectlog;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface AspectLog {
	
}

 

第三步:创建一个AspectLogProperties类,用于加载yml或properties中的属性

package com.oysept.autoconfiguration.aspectlog;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties("aspectlog")
public class AspectLogProperties {

    private boolean enable;

    public boolean isEnable() {
        return enable;
    }

    public void setEnable(boolean enable) {
        this.enable = enable;
    }
}

 

第四步:创建一个AspectLogAutoConfiguration打印日志自动配置类

package com.oysept.autoconfiguration.aspectlog;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.core.PriorityOrdered;

@Aspect
@EnableAspectJAutoProxy(exposeProxy = true, proxyTargetClass = true)
@Configuration
@ConditionalOnProperty(prefix="aspectlog", name = "enable", havingValue = "true", matchIfMissing = true)
public class AspectLogAutoConfiguration implements PriorityOrdered {

    protected Logger logger = LoggerFactory.getLogger(getClass());

    @Around("@annotation(com.oysept.autoconfiguration.aspectlog.AspectLog) ")
    public Object isOpen(ProceedingJoinPoint thisJoinPoint) throws Throwable {
        //执行方法名称 
        String taskName = thisJoinPoint.getSignature()
            .toString().substring(
                thisJoinPoint.getSignature()
                    .toString().indexOf(" "), 
                    thisJoinPoint.getSignature().toString().indexOf("("));
        taskName = taskName.trim();
        long time = System.currentTimeMillis();
        Object result = thisJoinPoint.proceed();
        logger.info("==>aspectlog method:{} run :{} ms", taskName, (System.currentTimeMillis() - time));
        return result;
    }
	
    @Override
    public int getOrder() {
        //保证事务等切面先执行
        return Integer.MAX_VALUE;
    }
}

注解说明:

@ConditionalOnProperty(prefix = “aspectLog”, name = “enable”,havingValue = “true”, matchIfMissing = true)

当yml或properties配置文件中有aspectLog.enable=true时开启,如果配置文件没有设置aspectLog.enable也开启。

 

第五步:创建spring.factories文件,该文件是springboot规定的配置文件,把自动配置类按规则配置

先在src/main/resources下创建一个META-INF文件夹,然后在文件夹下创建spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.oysept.autoconfiguration.aspectlog.AspectLogAutoConfiguration

META-INF/spring.factories是spring的工厂机制,在这个文件中定义的类,都会被自动加载。多个配置使用逗号分割,换行用\

 

第六步:使用mvn install方式把该模块自动打包

 

四)测试aspectlog-spring-boot-starter打印日志配置

另外创建一个springboot_starter_test名称的maven项目

在pom中引入aspectlog-spring-boot-starter的jar

<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.oysept</groupId>
    <artifactId>springboot_starter_test</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
  
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/>
    </parent>
  
    <properties>
        <java.version>1.8</java.version>
    </properties>
  
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    	
        <!-- 引入自定义aspectlog-spring-boot-starter 打印日志jar -->
        <dependency>
            <groupId>com.oysept</groupId>
            <artifactId>aspectlog-spring-boot-starter</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
    
    <!-- maven打包插件,在cmd命令窗口执行,如: mvn install -U -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

 

创建一个application.yml,配置启动的端口,默认是8080

server:
    port: 8080

 

创建application启动类

package com.oysept;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class TestSpringBootStarterApplication {

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

 

创建测试AspectLog功能controller

package com.oysept.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.oysept.autoconfiguration.aspectlog.AspectLog;

@RestController
public class GetController {
	
    /**
     * 访问地址: http://localhost:8080/test/starter/aspectlog?param=TTTEEESSSTTT
     * @return
     */
    @AspectLog
    @RequestMapping(value="/test/starter/aspectlog", method = RequestMethod.GET)
    public String testStarterAspectLog(@RequestParam(value = "param") String param) {
        System.out.println("==>/test/starter/aspectlog, param: " + param);
		
        // 处理业务逻辑
        return "/test/starter/aspectlog SUCCESS!";
    }
}

在想要打印日志的方法上,使用@AspectLog注解

 

启动TestSpringBootStarterApplication中的main方法

在浏览器中输入:http://localhost:8080/test/starter/aspectlog?param=TTTEEESSSTTT

然后在控制台查看效果:

 

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原文链接:https://blog.csdn.net/p812438109/article/details/108558345