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设计模式之Factory系列，FactoryMethod, AbstractFactory，以及spring bean工厂开头
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‎.idea/libraries/Maven__asm_asm_all_3_3_1.xml‎

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‎.idea/workspace.xml‎

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‎DesignPatterns.iml‎

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<orderEntry type="library" name="Maven: org.aspectj:aspectjweaver:1.9.4" level="project" />
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<orderEntry type="library" name="Maven: cglib:cglib:3.2.12" level="project" />
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<orderEntry type="library" name="Maven: org.ow2.asm:asm:7.1" level="project" />
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<orderEntry type="library" name="Maven: asm:asm-all:3.3.1" level="project" />
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</component>
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</module>

‎pom.xml‎

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<version>3.2.12</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/asm/asm-all -->
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<dependency>
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<groupId>asm</groupId>
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<artifactId>asm-all</artifactId>
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<version>3.3.1</version>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/com/mashibing/dp/ASM/ClassPrinter.java‎

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package com.mashibing.dp.ASM;
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import org.objectweb.asm.ClassReader;
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import org.objectweb.asm.ClassVisitor;
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import org.objectweb.asm.FieldVisitor;
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import org.objectweb.asm.MethodVisitor;
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import java.io.IOException;
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import static org.objectweb.asm.Opcodes.ASM4;
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public class ClassPrinter extends ClassVisitor {
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public ClassPrinter() {
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super(ASM4);
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}
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@Override
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public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
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System.out.println(name + " extends " + superName + "{" );
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}
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@Override
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public FieldVisitor visitField(int access, String name, String descriptor, String signature, Object value) {
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System.out.println(" " + name);
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return null;
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}
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@Override
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public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
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System.out.println(" " + name + "()");
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return null;
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}
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@Override
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public void visitEnd() {
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System.out.println("}");
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}
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public static void main(String[] args) throws IOException {
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ClassPrinter cp = new ClassPrinter();
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ClassReader cr = new ClassReader("java.lang.Runnable");
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// ClassReader cr = new ClassReader(
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// ClassPrinter.class.getClassLoader().getResourceAsStream("com/mashibing/dp/ASM/T1.class"));
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cr.accept(cp, 0);
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}
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}

‎src/main/java/com/mashibing/dp/ASM/ClassTransformerTest.java‎

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package com.mashibing.dp.ASM;
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import org.objectweb.asm.*;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.OutputStream;
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import static org.objectweb.asm.Opcodes.*;
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public class ClassTransformerTest {
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public static void main(String[] args) throws Exception {
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ClassReader cr = new ClassReader(
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ClassPrinter.class.getClassLoader().getResourceAsStream("com/mashibing/dp/ASM/Tank.class"));
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ClassWriter cw = new ClassWriter(0);
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ClassVisitor cv = new ClassVisitor(ASM4, cw) {
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@Override
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public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
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MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
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//return mv;
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return new MethodVisitor(ASM4, mv) {
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@Override
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public void visitCode() {
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visitMethodInsn(INVOKESTATIC, "TimeProxy","before", "()V", false);
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super.visitCode();
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}
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};
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}
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};
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cr.accept(cv, 0);
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byte[] b2 = cw.toByteArray();
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String path = (String)System.getProperties().get("user.dir");
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File f = new File(path + "/com/mashibing/dp/ASM/");
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f.mkdirs();
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FileOutputStream fos = new FileOutputStream(new File(path + "/com/mashibing/dp/ASM/Tank_0.class"));
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fos.write(b2);
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fos.flush();
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fos.close();
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}
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}

‎src/main/java/com/mashibing/dp/ASM/ClassWriteTest.java‎

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package com.mashibing.dp.ASM;
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import org.objectweb.asm.ClassWriter;
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import static org.objectweb.asm.Opcodes.*;
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public class ClassWriteTest {
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public static void main(String[] args) {
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ClassWriter cw = new ClassWriter(0);
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cw.visit(V1_5, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE,
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"pkg/Comparable", null, "java/lang/Object",
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null);
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cw.visitField(ACC_PUBLIC + ACC_FINAL + ACC_STATIC, "LESS", "I",
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null, -1).visitEnd();
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cw.visitField(ACC_PUBLIC + ACC_FINAL + ACC_STATIC, "EQUAL", "I",
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null, 0).visitEnd();
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cw.visitField(ACC_PUBLIC + ACC_FINAL + ACC_STATIC, "GREATER", "I",
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null, 1).visitEnd();
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cw.visitMethod(ACC_PUBLIC + ACC_ABSTRACT, "compareTo",
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"(Ljava/lang/Object;)I", null, null).visitEnd();
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cw.visitEnd();
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byte[] b = cw.toByteArray();
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MyClassLoader myClassLoader = new MyClassLoader();
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Class c = myClassLoader.defineClass("pkg.Comparable", b);
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System.out.println(c.getMethods()[0].getName());
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}
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}
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‎src/main/java/com/mashibing/dp/ASM/Main.java‎

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package com.mashibing.dp.ASM;
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public class Main {
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public static void main(String[] args) {
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new T1();
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}
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}

‎src/main/java/com/mashibing/dp/ASM/MyClassLoader.java‎

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package com.mashibing.dp.ASM;
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class MyClassLoader extends ClassLoader {
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public Class defineClass(String name, byte[] b) {
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return defineClass(name, b, 0, b.length);
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}
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}

‎src/main/java/com/mashibing/dp/ASM/T1.java‎

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package com.mashibing.dp.ASM;
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/**
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* 光标必须位于类体内，View-Show ByteCode
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*/
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public class T1 {
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int i = 0;
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public void m() {
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int j=1;
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}
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}

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