这个问题在邮件列表上已经讨论过一段时间了[0]。总结一下：由于Java中没有可用的语言结构和API（如果您确实想完全删除Groovy依赖），因此将Groovy转换为Java很难实现。
特别是随着调用站点缓存和其他性能优化技术的引入，生成的Java代码看起来会像这样（为了简单起见，我只是将一些脚本扔进了JD-GUI [1]）：
public class script1351632333660 extends Script
{
public script1351632333660()
{
script1351632333660 this;
CallSite[] arrayOfCallSite = $getCallSiteArray();
}
public script1351632333660(Binding arg1)
{
Binding context;
CallSite[] arrayOfCallSite = $getCallSiteArray();
ScriptBytecodeAdapter.invokeMethodOnSuperN($get$$class$groovy$lang$Script(), this, "setBinding", new Object[] { context });
}
public Object run()
{
CallSite[] arrayOfCallSite = $getCallSiteArray(); Object items = ScriptBytecodeAdapter.createList(new Object[0]);
Object[] item = (Object[])ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.createList(new Object[] { "Fluff", arrayOfCallSite[1].callConstructor($get$$class$java$util$Date()), (Integer)DefaultTypeTransformation.box(11235813) }), $get$array$$class$java$lang$Object());
arrayOfCallSite[2].call(items, item);
arrayOfCallSite[3].callCurrent(this, items);
ValueRecorder localValueRecorder = new ValueRecorder();
try
{
Object tmp102_101 = items; localValueRecorder.record(tmp102_101, 8);
Object tmp126_121 = arrayOfCallSite[4].call(tmp102_101, new script1351632333660._run_closure1(this)); localValueRecorder.record(tmp126_121, 14); if (DefaultTypeTransformation.booleanUnbox(tmp126_121)) localValueRecorder.clear(); else ScriptBytecodeAdapter.assertFailed(AssertionRenderer.render("assert items.findAll { it }", localValueRecorder), null); } finally {
localValueRecorder.clear(); throw finally; } return null; return null; }
static { __$swapInit();
Long localLong1 = (Long)DefaultTypeTransformation.box(0L);
__timeStamp__239_neverHappen1351632333665 = localLong1.longValue();
Long localLong2 = (Long)DefaultTypeTransformation.box(1351632333665L);
__timeStamp = localLong2.longValue(); }
class _run_closure1 extends Closure implements GeneratedClosure { public _run_closure1(Object _thisObject) { super(_thisObject); }
public Object doCall(Object it) { CallSite[] arrayOfCallSite = $getCallSiteArray(); return it; return null;
}
[0] http://groovy.329449.n5.nabble.com/Java-lt-gt-Groovy-converters-td337442.html
[1] http://java.decompiler.free.fr
