更新案例

.gitignore

@@ -0,0 +1,34 @@
+
+target/
+**/target/**
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

README.md

@@ -1,3 +1,17 @@
 # LoadTimeWeaving-demo
 
-LTW(LoadTimeWeaving)技术实现AOP功能
+LTW(LoadTimeWeaving)技术实现AOP功能
+
+
+
+参考了：
+https://www.eclipse.org/aspectj/doc/released/devguide/ltw-configuration.html
+
+执行步骤：
+1.mvn clean package，得到jar包：java-aspectj-agent-1.0-SNAPSHOT
+
+2.把aspectjweaver-1.8.2.jar拷贝到和本jar包同路径下
+
+3.cmd下执行：
+java -javaagent:aspectjweaver-1.8.2.jar -cp java-aspectj-agent-1.0-SNAPSHOT.jar cn.x47.ltw.Main
+

java-aspectj-agent/pom.xml

@@ -0,0 +1,25 @@
+<?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>
+    <parent>
+        <groupId>cn.x47.blog</groupId>
+        <artifactId>LoadTimeWeaving-demo</artifactId>
+        <version>1.0</version>
+    </parent>
+
+    <artifactId>java-aspectj-agent</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>fastjson</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjweaver</artifactId>
+        </dependency>
+    </dependencies>
+</project>

java-aspectj-agent/src/main/java/cn/x47/ltw/Main.java

@@ -0,0 +1,19 @@
+package cn.x47.ltw;
+
+import com.alibaba.fastjson.JSON;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author xuwei
+ */
+public final class Main {
+
+    public static void main(String[] args) {
+        Map<String, String> map = new HashMap<>(1);
+        map.put("key", "ssss");
+        JSON.toJSONString(map);
+
+    }
+}

java-aspectj-agent/src/main/java/cn/x47/ltw/ProfilingAspect.java

@@ -0,0 +1,26 @@
+package cn.x47.ltw;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Pointcut;
+
+/**
+ * @author xuwei
+ */
+@Aspect
+public class ProfilingAspect {
+
+    @Pointcut("execution(public * com.alibaba.fastjson.JSON.toJSONString(java.lang.Object))")
+    public void p2() {
+    }
+
+    @Around("p2()")
+    public Object profile2(ProceedingJoinPoint pjp) throws Throwable {
+        System.out.println("A2");
+        Object proceed = pjp.proceed();
+        System.out.println(proceed);
+        System.out.println("q2");
+        return proceed;
+    }
+}

java-aspectj-agent/src/main/resources/META-INF/aop.xml

@@ -0,0 +1,15 @@
+<!DOCTYPE aspectj PUBLIC "-//AspectJ//DTD//EN" "https://www.eclipse.org/aspectj/dtd/aspectj.dtd">
+<aspectj>
+
+    <weaver>
+        <!-- only weave classes in our application-specific packages -->
+        <include within="cn.x47.ltw..*"/>
+        <include within="com.alibaba.fastjson.*"/>
+    </weaver>
+
+    <aspects>
+        <!-- weave in just this aspect -->
+        <aspect name="cn.x47.ltw.ProfilingAspect"/>
+    </aspects>
+
+</aspectj>

pom.xml

@@ -0,0 +1,51 @@
+<?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>cn.x47.blog</groupId>
+    <artifactId>LoadTimeWeaving-demo</artifactId>
+    <version>1.0</version>
+    <packaging>pom</packaging>
+    <name>LoadTimeWeaving-demo</name>
+    <url>https://www.61dz.com</url>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.3</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+
+    <modules>
+        <module>java-aspectj-agent</module>
+        <module>springboot-aspectj-agent</module>
+    </modules>
+
+    <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>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>2.7.3</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.aspectj</groupId>
+                <artifactId>aspectjweaver</artifactId>
+                <version>1.9.6</version>
+            </dependency>
+            <dependency>
+                <groupId>com.alibaba</groupId>
+                <artifactId>fastjson</artifactId>
+                <version>2.0.12</version>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+</project>

springboot-aspectj-agent/pom.xml

@@ -0,0 +1,61 @@
+<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>cn.x47.blog</groupId>
+        <artifactId>LoadTimeWeaving-demo</artifactId>
+        <version>1.0</version>
+    </parent>
+
+    <artifactId>aspectj-agent-springboot</artifactId>
+    <version>1.0</version>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>fastjson</artifactId>
+            <version>2.0.12</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-aop</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjweaver</artifactId>
+            <version>1.9.9</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

springboot-aspectj-agent/src/main/java/cn/x47/ltw/springboot/TestApplication.java

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+package cn.x47.ltw.springboot;
+
+import com.alibaba.fastjson.JSON;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author xuwei
+ */
+@SpringBootApplication
+public class TestApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(TestApplication.class, args);
+        Map<String, String> map = new HashMap<>(1);
+        map.put("key", "ssss");
+        JSON.toJSONString(map);
+    }
+
+}

springboot-aspectj-agent/src/main/java/cn/x47/ltw/springboot/aop/TestAspect.java

@@ -0,0 +1,27 @@
+package cn.x47.ltw.springboot.aop;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+
+/**
+ * @author xuwei
+ */
+@Aspect
+public class TestAspect {
+
+    @Around("execution(* com.alibaba.fastjson..*.*(..))")
+    public String parse2String(ProceedingJoinPoint join) {
+        System.out.println("parse to String before");
+        String str = "";
+        try {
+            str = (String) join.proceed();
+            System.out.println("result:" + str);
+        } catch (Throwable e) {
+            e.printStackTrace();
+        }
+        System.out.println("parse to String after");
+        return str;
+    }
+
+}

springboot-aspectj-agent/src/main/java/cn/x47/ltw/springboot/controller/TestController.java

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+package cn.x47.ltw.springboot.controller;
+
+import com.alibaba.fastjson.JSON;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author xuwei
+ */
+@RestController
+@RequestMapping("/test")
+public class TestController {
+    @GetMapping
+    public Object test(String a) {
+        Map<String, String> map = new HashMap<>(1);
+        map.put("key", a);
+        return JSON.toJSONString(map);
+    }
+}

springboot-aspectj-agent/src/main/resources/META-INF/aop.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<aspectj>
+    <weaver options="-XnoInline -Xset:weaveJavaxPackages=true -Xlint:ignore -verbose -XmessageHandlerClass:org.springframework.aop.aspectj.AspectJWeaverMessageHandler">
+        <!--在编织时导入切面类和需要被切入的目标类-->
+        <include within="cn.x47.ltw..*"/>
+        <include within="com.alibaba.fastjson..*"/>
+    </weaver>
+    <aspects>
+        <!--指定切面类-->
+        <aspect name="cn.x47.ltw.springboot.aop.TestAspect"/>
+    </aspects>
+</aspectj>

springboot-aspectj-agent/src/main/resources/application.yml

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+server:
+  port: 8080

springboot-aspectj-agent/src/test/java/cn/x47/ltw/springboot/TestApplicationTests.java

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+package cn.x47.ltw.springboot;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class TestApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}