一个简单的groovy script生成的class文件及其反编译

Groovy

def task = {println "Hello from source code-Task"}task()def task2 = {println "Hello from source code-Task2"}class B {String getName(){return "Young"}}println new B().getName();task2();结果Hello from source code-TaskYoungHello from source code-Task2Groovy默认是不为这个script写class文件的,但是我们可以通过配置文件或者直接修改原码,

conf.setTargetDirectory

指定class的存放路径

这里生成四个class文件

B.class test$_run_closure1,test$_run_closure2.class, test.class

反编译以后

import groovy.lang.GroovyObject;import groovy.lang.MetaClass;import org.codehaus.groovy.runtime.callsite.CallSite;public class B implements GroovyObject{ public B() {B this;CallSite[] arrayOfCallSite = $getCallSiteArray();MetaClass localMetaClass = $getStaticMetaClass();this.metaClass = localMetaClass; }public String getName() {CallSite[] arrayOfCallSite = $getCallSiteArray();return "Young";return null; }static {__$swapInit();Long localLong1 = Long.valueOf(0L);__timeStamp__239_neverHappen1423373575093 = localLong1.longValue();Long localLong2 = Long.valueOf(1423373575093L);__timeStamp = localLong2.longValue(); }}

import groovy.lang.Closure;import org.codehaus.groovy.runtime.GeneratedClosure;import org.codehaus.groovy.runtime.callsite.CallSite;class test$_run_closure1 extends Closure implements GeneratedClosure{ public test$_run_closure1(Object _outerInstance, Object _thisObject) {super(_outerInstance, _thisObject); }public Object doCall(Object it) {CallSite[] arrayOfCallSite = $getCallSiteArray();return arrayOfCallSite[0].callCurrent(this, "Hello from source code-Task");return null; }public Object doCall() {CallSite[] arrayOfCallSite = $getCallSiteArray();return doCall(null);return null; }static {}}import groovy.lang.Closure;import org.codehaus.groovy.runtime.GeneratedClosure;import org.codehaus.groovy.runtime.callsite.CallSite;class test$_run_closure2 extends Closure implements GeneratedClosure{ public test$_run_closure2(Object _outerInstance, Object _thisObject) {super(_outerInstance, _thisObject); }public Object doCall(Object it) {CallSite[] arrayOfCallSite = $getCallSiteArray();return arrayOfCallSite[0].callCurrent(this, "Hello from source code-Task2");return null; }public Object doCall() {CallSite[] arrayOfCallSite = $getCallSiteArray();return doCall(null);return null; }static {}}import groovy.lang.Binding;import groovy.lang.Closure;import groovy.lang.Script;import org.codehaus.groovy.runtime.GeneratedClosure;import org.codehaus.groovy.runtime.InvokerHelper;import org.codehaus.groovy.runtime.ScriptBytecodeAdapter;import org.codehaus.groovy.runtime.callsite.CallSite;public class test extends Script{ public test() {test this;CallSite[] arrayOfCallSite = $getCallSiteArray(); }public test(Binding arg1) {Binding context;CallSite[] arrayOfCallSite = $getCallSiteArray();ScriptBytecodeAdapter.invokeMethodOnSuperN(Script.class, this, "setBinding", new Object[] { context }); }public static void main(String… args) {CallSite[] arrayOfCallSite = $getCallSiteArray();arrayOfCallSite[0].call(InvokerHelper.class, test.class, args); }class _run_closure1extends Closureimplements GeneratedClosure {public _run_closure1(Object _thisObject){super(_thisObject);}public Object doCall(Object it){CallSite[] arrayOfCallSite = $getCallSiteArray();return arrayOfCallSite[0].callCurrent(this, "Hello from source code-Task");return null;}public Object doCall(){CallSite[] arrayOfCallSite = $getCallSiteArray();return doCall(null);return null;}static {} }class _run_closure2extends Closureimplements GeneratedClosure {public _run_closure2(Object _thisObject){super(_thisObject);}public Object doCall(Object it){CallSite[] arrayOfCallSite = $getCallSiteArray();return arrayOfCallSite[0].callCurrent(this, "Hello from source code-Task2");return null;}public Object doCall(){CallSite[] arrayOfCallSite = $getCallSiteArray();return doCall(null);return null;}static {} }public Object run() {CallSite[] arrayOfCallSite = $getCallSiteArray();Object task = new test._run_closure1(this);arrayOfCallSite[1].call(task);Object task2 = new test._run_closure2(this);arrayOfCallSite[2].callCurrent(this, arrayOfCallSite[3].call(arrayOfCallSite[4].callConstructor(B.class)));return arrayOfCallSite[5].call(task2);return null; }static {__$swapInit();Long localLong1 = Long.valueOf(0L);__timeStamp__239_neverHappen1423373575421 = localLong1.longValue();Long localLong2 = Long.valueOf(1423373575421L);__timeStamp = localLong2.longValue(); }}

核心的执行代码是

script = (Script) scriptClass.newInstance(); —->1

script.run();—–>2

执行1的时候

首先执行了一个内布生成的createCallSiteArray 函数,它会执行

却不去主动改变，而是放任它的生活态度。