init

.gitignore

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+HELP.md
+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/

pom.xml

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+<?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>top.meethigher</groupId>
+    <artifactId>mock-instance</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>top.meethigher</groupId>
+            <artifactId>cache-store</artifactId>
+            <version>1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>top.meethigher</groupId>
+            <artifactId>object-converter</artifactId>
+            <version>1.1</version>
+        </dependency>
+
+        <!-- https://mvnrepository.com/artifact/cglib/cglib -->
+        <dependency>
+            <groupId>cglib</groupId>
+            <artifactId>cglib</artifactId>
+            <version>3.3.0</version>
+        </dependency>
+
+        <!-- https://mvnrepository.com/artifact/net.bytebuddy/byte-buddy -->
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy</artifactId>
+            <version>1.12.18</version>
+        </dependency>
+
+
+    </dependencies>
+
+</project>

src/main/java/top/meethigher/mock/instance/ObjectTest.java

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+package top.meethigher.mock.instance;
+
+public class ObjectTest {
+
+    private String name;
+
+    private String money;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getMoney() {
+        return money;
+    }
+
+    public void setMoney(String money) {
+        this.money = money;
+    }
+}

src/main/java/top/meethigher/mock/instance/Test.java

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+package top.meethigher.mock.instance;
+
+
+
+import net.bytebuddy.ByteBuddy;
+import net.bytebuddy.dynamic.DynamicType;
+import net.bytebuddy.implementation.FixedValue;
+import net.bytebuddy.matcher.ElementMatchers;
+import top.meethigher.mock.instance.proxy.MockInstanceHandler;
+
+public class Test {
+
+
+
+    public static void main(String[] args) throws InstantiationException, IllegalAccessException {
+
+//        //第一种方式，有注解：需要参考一下Lombok的做法
+//        //@MockInstance
+//        //ObjectTest objectTest=new ObjectTest();
+//
+//        //第二种方式，无注解
+//        ObjectTest objectTest = new MockInstanceHandler().instance(ObjectTest.class);
+//
+//        /**
+//         * toString获取内容如下
+//         * <p>
+//         * ObjectTest objectTest=new ObjectTest();
+//         * objectTest.setMoney("money-test");
+//         * objectTest.setName("name-test");
+//         * </p>
+//         */
+////        System.out.println(objectTest.toString());
+//
+//        /**
+//         * 获取内容如下
+//         * <p>
+//         * name-test
+//         * </p>
+//         */
+//        System.out.println(objectTest.getName());
+
+        Class<?> dynamicType = new ByteBuddy()
+                .subclass(Object.class)
+                .method(ElementMatchers.named("toString"))
+                .intercept(FixedValue.value("Hello World"))
+                .make()
+                .load(ObjectTest.class.getClassLoader())
+                .getLoaded();
+
+        ObjectTest instance = (ObjectTest)dynamicType.newInstance();
+        String toString = instance.toString();
+        System.out.println(toString);
+        System.out.println(instance.getClass().getCanonicalName());
+
+    }
+}

src/main/java/top/meethigher/mock/instance/annotation/MockInstance.java

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+package top.meethigher.mock.instance.annotation;
+
+import java.lang.annotation.*;
+
+/**
+ * 针对测试时使用的Mock注解
+ *
+ * @author chenchuancheng
+ * @since 2022/11/8 16:12
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.LOCAL_VARIABLE)
+public @interface MockInstance {
+}

src/main/java/top/meethigher/mock/instance/proxy/MockInstanceHandler.java

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+package top.meethigher.mock.instance.proxy;
+
+
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+
+public class MockInstanceHandler {
+
+    public <T> T instance(Class<?> clazz) {
+        if (clazz == null) {
+            throw new IllegalArgumentException("参数 'clazz' 不可为空");
+        }
+        T t = (T) Enhancer.create(clazz, (MethodInterceptor) (o, method, objects, methodProxy) -> {
+            System.out.println(method.getName());
+            return method.invoke(o, objects);
+        });
+        return t;
+    }
+
+
+}