AspectJ：如何将方面库编织到Java项目中

更新时间：2023-09-16 18:49:04

将方面库添加为常规< dependency> ，

还添加相同的依赖项（不含< version> 因为它已在插件< configuration>< aspectLibraries> 部分中作为步骤1）分配< aspectLibrary> 。

add the aspect library as a regular <dependency>,
also add the same dependency (without <version> because it is already assigned in step 1) in the plugin <configuration><aspectLibraries> section as an <aspectLibrary>.

这是一个具体的例子：

Aspect库POM，标记a符号和示例方面：

<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.scrum-master.***</groupId>
    <artifactId>aspectj-lib</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>AspectJ Library</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.source-target.version>1.8</java.source-target.version>
        <aspectj.version>1.8.7</aspectj.version>
    </properties>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.3</version>
                    <configuration>
                        <source>${java.source-target.version}</source>
                        <target>${java.source-target.version}</target>
                        <!-- IMPORTANT -->
                        <useIncrementalCompilation>false</useIncrementalCompilation>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>aspectj-maven-plugin</artifactId>
                    <version>1.7</version>
                    <configuration>
                        <!--<showWeaveInfo>true</showWeaveInfo> -->
                        <source>${java.source-target.version}</source>
                        <target>${java.source-target.version}</target>
                        <Xlint>ignore</Xlint>
                        <complianceLevel>${java.source-target.version}</complianceLevel>
                        <encoding>${project.build.sourceEncoding}</encoding>
                        <!--<verbose>true</verbose> -->
                        <!--<warn>constructorName,packageDefaultMethod,deprecation,maskedCatchBlocks,unusedLocals,unusedArguments,unusedImport</warn> -->
                    </configuration>
                    <executions>
                        <execution>
                            <!-- IMPORTANT -->
                            <phase>process-sources</phase>
                            <goals>
                                <goal>compile</goal>
                                <goal>test-compile</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>org.aspectj</groupId>
                            <artifactId>aspectjtools</artifactId>
                            <version>${aspectj.version}</version>
                        </dependency>
                    </dependencies>
                </plugin>
            </plugins>
        </pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
            </plugin>
            <!--
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
            </plugin>
            -->
        </plugins>
    </build>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjrt</artifactId>
                <version>${aspectj.version}</version>
                <scope>runtime</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
        </dependency>
    </dependencies>

    <organization>
        <name>Scrum-Master.de - Agile Project Management</name>
        <url>http://scrum-master.de</url>
    </organization>

</project>

package de.scrum_master.aspect;

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

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

package de.scrum_master.aspect;

public aspect MyAspect {
    before() : execution(* *(..)) && @annotation(Marker) {
        System.out.println(thisJoinPoint);
    }
}

现在运行 mvn clean install方面库项目上的，以便将依赖项安装到本地Maven仓库中。

Now run mvn clean install on the aspect library project so as to install the dependency into your local Maven repo.

Java应用程序POM和示例应用程序：

顺便说一句，在POM中我还添加了两个可选插件：

By the way, in the POM I have also added two optional plugins:

One-JAR插件将您的应用程序与所有依赖项（例如方面库和AspectJ运行时）打包到一个工件中，这里是 target / java-app-0.0.1-SNAPSHOT.one-jar。罐。您可以通过 java -jar target / java-app-0.0.1-SNAPSHOT.one-jar.jar 运行您的应用程序。

如果你想从命令行通过 mvn clean install exec：java 测试你的应用程序，那么Exec Maven插件很有用。

One-JAR plugin packages your application with all dependencies (e.g. aspect library and AspectJ runtime) into one artifact, here target/java-app-0.0.1-SNAPSHOT.one-jar.jar. You can just run your application via java -jar target/java-app-0.0.1-SNAPSHOT.one-jar.jar.
Exec Maven plugin is useful if you easily want to test your application from the command line via mvn clean install exec:java.

这两个只是为了方便起见，如果您不喜欢它们，则不需要它们。

These two are only for convenience, you do not need them if you dislike them.

<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.scrum-master.***</groupId>
    <artifactId>java-app</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>Java Application</name>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.source-target.version>1.8</java.source-target.version>
        <aspectj.version>1.8.7</aspectj.version>
        <main-class>de.scrum_master.app.Application</main-class>
    </properties>

    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.3</version>
                    <configuration>
                        <source>${java.source-target.version}</source>
                        <target>${java.source-target.version}</target>
                        <!-- IMPORTANT -->
                        <useIncrementalCompilation>false</useIncrementalCompilation>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>aspectj-maven-plugin</artifactId>
                    <version>1.7</version>
                    <configuration>
                        <!--<showWeaveInfo>true</showWeaveInfo> -->
                        <source>${java.source-target.version}</source>
                        <target>${java.source-target.version}</target>
                        <Xlint>ignore</Xlint>
                        <complianceLevel>${java.source-target.version}</complianceLevel>
                        <encoding>${project.build.sourceEncoding}</encoding>
                        <!--<verbose>true</verbose> -->
                        <!--<warn>constructorName,packageDefaultMethod,deprecation,maskedCatchBlocks,unusedLocals,unusedArguments,unusedImport</warn> -->
                        <aspectLibraries>
                            <aspectLibrary>
                                <groupId>de.scrum-master.***</groupId>
                                <artifactId>aspectj-lib</artifactId>
                            </aspectLibrary>
                        </aspectLibraries>
                    </configuration>
                    <executions>
                        <execution>
                            <!-- IMPORTANT -->
                            <phase>process-sources</phase>
                            <goals>
                                <goal>compile</goal>
                                <goal>test-compile</goal>
                            </goals>
                        </execution>
                    </executions>
                    <dependencies>
                        <dependency>
                            <groupId>org.aspectj</groupId>
                            <artifactId>aspectjtools</artifactId>
                            <version>${aspectj.version}</version>
                        </dependency>
                    </dependencies>
                </plugin>
                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>exec-maven-plugin</artifactId>
                    <version>1.4.0</version>
                    <configuration>
                        <mainClass>${main-class}</mainClass>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.dstovall</groupId>
                    <artifactId>onejar-maven-plugin</artifactId>
                    <version>1.4.4</version>
                    <executions>
                        <execution>
                            <goals>
                                <goal>one-jar</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <onejarVersion>0.96</onejarVersion>
                        <mainClass>${main-class}</mainClass>
                        <attachToBuild>true</attachToBuild>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>aspectj-maven-plugin</artifactId>
            </plugin>
            <!--
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
            </plugin>
            -->
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <configuration>
                    <mainClass>${main-class}</mainClass>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.dstovall</groupId>
                <artifactId>onejar-maven-plugin</artifactId>
                <configuration>
                    <mainClass>${main-class}</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <pluginRepositories>
        <pluginRepository>
            <id>OneJAR googlecode.com</id>
            <url>http://onejar-maven-plugin.googlecode.com/svn/mavenrepo</url>
        </pluginRepository>
    </pluginRepositories>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjrt</artifactId>
                <version>${aspectj.version}</version>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>de.scrum-master.***</groupId>
                <artifactId>aspectj-lib</artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
        </dependency>
            <dependency>
                <groupId>de.scrum-master.***</groupId>
                <artifactId>aspectj-lib</artifactId>
            </dependency>
    </dependencies>

    <organization>
        <name>Scrum-Master.de - Agile Project Management</name>
        <url>http://scrum-master.de</url>
    </organization>

</project>

这个小驱动程序应用程序演示了现在可以使用 @Marker ，在这种情况下只有 foo 和 zot ，但不是 bar ：

This little driver application demonstrates that you can now annotate methods with @Marker, in this case only foo and zot, but not bar:

package de.scrum_master.app;

import de.scrum_master.aspect.Marker;

public class Application {
    @Marker
    public static void foo() {}

    public static void bar() {}

    @Marker
    public static void zot() {}

    public static void main(String[] args) {
        foo();
        bar();
        zot();
    }
}

控制台日志：

java -jar target/java-app-0.0.1-SNAPSHOT.one-jar.jar

execution(void de.scrum_master.app.Application.foo())
execution(void de.scrum_master.app.Application.zot())

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AspectJ：如何将方面库编织到Java项目中

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