java - 如何在使用 maven 构建的 spring boot 2 java 应用程序中使用 groovy 解释(带有 spring-aop 注释)？

Question

我有一个 spring boot 2 java 应用程序，想使用解释的(未编译的)groovy 代码来注入(inject) aop。通过阅读 spring 文档，这听起来像是可能的，但我找不到任何示例。 AOP - advising scripted beans :

You are of course not just limited to advising scripted beans…​ you can also write aspects themselves in a supported dynamic language and use such beans to advise other Spring beans. This really would be an advanced use of the dynamic language support though.

最后我想要一个目录，我可以在其中将 groovy 脚本(用于业务逻辑)添加到将通过 spring-aop 注入(inject)自身的应用程序。

我不确定的是 spring boot 2 在这种情况下会自动执行什么操作，还是我必须手动集成基于 org.springframework.scripting 的代码？

所以这是我的小测试项目:

project
|-pom.xml
|src/main/java/de/test
|-Commandline.java
|-MytestApplication.java
|-TestConfig.java
|-GetText.java
|src/main/resources/groovy
|-testAspect.groovy
|src/main/resources
|-application.properties   (empty at the moment)
|-applicationContext.xml

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>de.test</groupId>
  <artifactId>mytest</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>mytest</name>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.4.RELEASE</version>
    <relativePath/>
  </parent>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.codehaus.groovy</groupId>
      <artifactId>groovy</artifactId>
    </dependency>
  </dependencies>

</project>

测试配置.java

package de.test;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@EnableAspectJAutoProxy
@ComponentScan({"de.test", "groovy"})
@ImportResource({"classpath*:applicationContext.xml"})
public class TestConfig
 {
 }

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:lang="http://www.springframework.org/schema/lang" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

  <lang:groovy id="testAspect" refresh-check-delay="30000" script-source="classpath:groovy/TestAspect.groovy"/>

</beans>

MytestApplication.java

package de.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan({"de.test", "groovy"})
@SpringBootApplication
public class SpringboottestApplication
 {
  public static void main(final String[] args)
   {
    SpringApplication.run(SpringboottestApplication.class, args);
   }
 }

GetText.java

package de.test;

import org.springframework.stereotype.Component;

@Component
public class GetText
 {
  public String getText()
   {
    return "test1";
   }

 }

命令行.java

package de.test;

import org.springframework.boot.CommandLineRunner;  
import org.springframework.stereotype.Component;

@Component
public class Commandline implements CommandLineRunner
 {
  @Autowired
  GetText textbean;

  public Commandline()
   {
    super();
   }

  @Override
  public void run(final String... args) throws Exception
   {
    System.out.println((this.textbean.getText());
   }
 }

测试方面.groovy

package groovy

import org.springframework.stereotype.Component

import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation.Around
import org.aspectj.lang.annotation.Aspect

@Aspect
@Component
class TestAspect
 {
  @Around("execution(String de.test.GetText.getText())")
  public String doChangeGetText(ProceedingJoinPoint pjp) throws Throwable
   {
    String retVal = (String)pjp.proceed();
    return retVal + "; test2";
   }
 }

之后

mvn clean install

我从这里开始

java -jar target/mytest-0.0.1-SNAPSHOT.jar

这只会导致“test1”作为输出，而不是想要的“test1；test2”。

更新 1:

• 添加了 TestConfig.java
• 将 src/main/groovy/groovy/testAspect.groovy 移动到 src/main/resources/groovy/testAspect.groovy
• 改进了一些东西，但仍然不起作用。

更新2:

• 添加了 GetText.java
• 修改 Commandline.java 以使用 GetText bean
• 更改切入点
• 还是不行

更新3:

• 添加了applicationContext.xml
• 现在在 org.springframework.aop.AopInvocationException 中运行:建议方法的参数不匹配切入点表达式 [org.aspectj.weaver.internal.tools.PointcutExpressionImpl@4c4f4365]；嵌套异常是 java.lang.IllegalArgumentException: object is not an instance of declaring class
• 当将 testAspect.groovy 复制为 java 类时 - 然后切入点按预期工作并且将附加“;test 2”，但作为 groovy 脚本，上述异常将会发生。
• 添加接口(interface) IGetText 和/或 IAspectTest 无济于事

Answer 1

这是一个经典问题，在这里被问了几十次:

Spring AOP 不会拦截bean 内部的自调用，只会拦截其他类对公共(public)Spring bean 方法的调用。这也记录在 Spring manual 中。 .