{"id":27711,"date":"2022-12-15T02:22:30","date_gmt":"2022-12-24T21:30:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8javassist%e9%80%9a%e8%bf%87coremod%e6%9d%a5%e8%bd%bb%e6%9d%be%e8%bf%9b%e8%a1%8c%e6%93%8d%e4%bd%9c\/"},"modified":"2025-08-12T04:12:34","modified_gmt":"2025-08-11T20:12:34","slug":"%e4%bd%bf%e7%94%a8javassist%e9%80%9a%e8%bf%87coremod%e6%9d%a5%e8%bd%bb%e6%9d%be%e8%bf%9b%e8%a1%8c%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8javassist%e9%80%9a%e8%bf%87coremod%e6%9d%a5%e8%bd%bb%e6%9d%be%e8%bf%9b%e8%a1%8c%e6%93%8d%e4%bd%9c\/","title":{"rendered":"\u4f7f\u7528Javassist\u901a\u8fc7CoreMod\u6765\u8f7b\u677e\u8fdb\u884c\u64cd\u4f5c"},"content":{"rendered":"

\u9996\u5148\u5728\u4fee\u6539Minecraft\u7684Mod\u65f6\uff0c\u4f1a\u9047\u5230Mojan\u8bbe\u7f6e\u7684\u9677\u9631\u89c4\u5219\u9650\u5236\u3002\u8981\u907f\u514d\u8fd9\u4e9b\u9650\u5236\uff0c\u9700\u8981\u4f7f\u7528CoreMod\u6765\u76f4\u63a5\u4fee\u6539\u5b57\u8282\u7801\uff0c\u4f46\u4f7f\u7528asm\u6765\u4fee\u6539\u662f\u76f8\u5f53\u56f0\u96be\u7684\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Javassist\u6765\u7b80\u5316\u8fd9\u4e2a\u8fc7\u7a0b\u3002<\/p>\n

\u62b1\u6b49\u8fd9\u7bc7\u6587\u7ae0\u4e0d\u4ecb\u7ecdJavassist\u7684\u4f7f\u7528\u65b9\u6cd5\u6216\u8005CoreMod\u672c\u8eab\u7684\u5236\u4f5c\u65b9\u6cd5\u3002\u5173\u4e8e\u8fd9\u4e9b\u5185\u5bb9\uff0c\u8bf7\u53c2\u8003Javassist\u7684\u5b98\u65b9\u9875\u9762\uff0cModding Wiki\u4e0a\u7684CoreMod\uff0c\u6216\u8005\u5728Github\u4e0a\u5bfb\u627e\u5176\u4ed6\u4eba\u5236\u4f5c\u7684Mod\u4ee3\u7801\u3002<\/p>\n

\u6b64\u5916\uff0c\u8fd9\u91cc\u4f7f\u7528\u7684\u662f\u6211\u7684\u5174\u8da3\u8bed\u8a00Scala\uff0cMinecraft\u7684\u7248\u672c\u662f1.12.2\u3002\u4e0d\u8fc7\uff0c\u6211\u8ba4\u4e3a\u5c06\u5176\u8f6c\u6362\u4e3aJava\u5e94\u8be5\u5f88\u7b80\u5355…\u5e94\u8be5\u5427\u3002<\/p>\n

\u53e6\u5916\uff0c\u4f7f\u7528\u65b9\u6cd5\u672c\u8eab\u5e94\u8be5\u4e0d\u4f9d\u8d56\u4e8eMinecraft\u7684\u7248\u672c\uff0c\u6240\u4ee5\u8bf7\u6839\u636e\u60a8\u60f3\u8981\u4f7f\u7528\u7684\u7248\u672c\u8fdb\u884c\u4ee3\u7801\u7684\u8f6c\u6362\u3002<\/p>\n

Javassist\u662f\u4ec0\u4e48\uff1f\u8fd9\u662f\u4e00\u4e2a\u5e93\uff0c\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u7f16\u8bd1Java\u6e90\u4ee3\u7801\u5e76\u751f\u6210\u5b57\u8282\u7801\uff0c\u8fd8\u53ef\u4ee5\u4fee\u6539\u73b0\u6709\u7c7b\u3002<\/p>\n

\u516c\u5f0f\u7f51\u9875\u662f\u7528\u82f1\u8bed\u7f16\u5199\u7684\uff0c\u4f46\u662f\u6709\u65e5\u8bed\u6559\u7a0b\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a\u5f88\u5bb9\u6613\u4e0a\u624b\u3002\u8bb8\u53ef\u8bc1\u6709LGPL\u3001MPL\u3001Apache License\u4e09\u79cd\u9009\u62e9\uff0c\u60a8\u53ef\u4ee5\u6839\u636e\u9700\u8981\u8fdb\u884c\u9009\u53d6\u3002<\/p>\n

\u8bf7\u60a8\u4ee5\u4e2d\u6587\u5c06\u4ee5\u4e0b\u5185\u5bb9\u8fdb\u884c\u91cd\u8ff0\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u9009\u9879\uff1a\u304a\u984c<\/p>\n

\u8ba9\u6211\u4eec\u901a\u8fc7\u4f7f\u7528\u6253\u706b\u77f3\u6765\u5c1d\u8bd5\u5728\u4ee3\u7801\u4e2d\u63d2\u5165\u4e00\u4e9b\u5904\u7406\u3002\u5927\u81f4\u4e0a\u5c31\u662f\u5728\u8fd9\u91cc\u63d2\u5165\u3002<\/p>\n

\/\/ 46\u884c\u76ee\u3042\u305f\u308a<\/span>\r\nif<\/span> (<\/span>player<\/span> instanceof<\/span> EntityPlayerMP<\/span>)<\/span> \/\/ \u2190\u3053\u3053\u306eif\u306e\u5224\u5b9a\u306e\u3042\u305f\u308a\u3092\u66f8\u304d\u63db\u3048\u308b<\/span>\r\n{<\/span>\r\n    CriteriaTriggers<\/span>.<\/span>PLACED_BLOCK<\/span>.<\/span>trigger<\/span>((<\/span>EntityPlayerMP<\/span>)<\/span>player<\/span>,<\/span> pos<\/span>,<\/span> itemstack<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7528\u6cd5<\/p>\n
\u6784\u5efa.gradle\u6587\u4ef6\u8ba9\u6211\u4eec\u5c06javassist\u6dfb\u52a0\u5230dependencies\u4e2d\u3002<\/p>\n
dependencies<\/span> {<\/span>\r\n    compile<\/span> group:<\/span> 'org.javassist'<\/span>,<\/span> name:<\/span> 'javassist'<\/span>,<\/span> version:<\/span> '3.22.0-GA'<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
\u521b\u5efa\u5176\u4ed6\u8bbe\u7f6e\u4e0e\u521b\u5efa\u6838\u5fc3\u6a21\u5757\u65f6\u76f8\u540c\uff0c\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n
IFMLLoadingPlugin: IFML\u52a0\u8f7d\u63d2\u4ef6\u6211\u4f1a\u5728TransformerExclusions\u4e2d\u6dfb\u52a0javassist\u3002<\/p>\n
@IFMLLoadingPlugin<\/span>.<\/span>TransformerExclusions<\/span>(<\/span>Array<\/span>(<\/span>\"java\"<\/span>,<\/span> \"scala\"<\/span>,<\/span> \"javassist\"<\/span>,<\/span> \"com.yukiaji.javassistsample.asm\"<\/span>))<\/span>\r\n@IFMLLoadingPlugin<\/span>.<\/span>MCVersion<\/span>(<\/span>\"1.12.2\"<\/span>)<\/span>\r\nclass<\/span> JavassistSampleCore<\/span> extends<\/span> IFMLLoadingPlugin<\/span> with<\/span> IFMLCallHook<\/span> {<\/span>\r\n    \/\/ snip<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
IClassTransformer \u7c7b\u8f6c\u6362\u5668<\/p>\n
\u4e8b\u5148\u51c6\u5907
\n\u4e00\u65e6\u627e\u5230\u76ee\u6807\u7c7b\uff0c\u5c31\u521b\u5efa\u4e00\u4e2aCtClass\u3002<\/p>\n
val<\/span> pool<\/span> =<\/span> ClassPool<\/span>.<\/span>getDefault<\/span>\r\nval<\/span> ctClass<\/span> =<\/span> pool<\/span>.<\/span>makeClass<\/span>(<\/span>new<\/span> ByteArrayInputStream<\/span>(<\/span>basicClass<\/span>))<\/span>\r\nctClass<\/span>.<\/span>defrost<\/span>()<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u4ece\u5b57\u8282\u6570\u7ec4\u521b\u5efaCtClass\u5b9e\u4f8b\uff0c\u5219\u8be5\u5b9e\u4f8b\u5c06\u5904\u4e8e\u4e0d\u53ef\u4fee\u6539\u7684\u72b6\u6001\uff0c\u9700\u8981\u8c03\u7528defrost\u65b9\u6cd5\u4ee5\u5b9e\u73b0\u4fee\u6539\u3002<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u5728\u52a0\u8f7d\u7684CtClass\u4e2d\u67e5\u627e\u6240\u9700\u7684\u65b9\u6cd5\u3002\u672c\u6b21\u6211\u4eec\u8981\u627e\u7684\u662fOnItemUse\u65b9\u6cd5\u3002<\/p>\n
\/\/ TargetMethodName\u306fOnItemUse\u3001TargetMethodSrgName\u306fOnItemUse\u306esrg\u540d\u3001TargetMethodSig\u306f(Lnet.minecraft.entity.player.EntityPlayer;L...)L...\u307f\u305f\u3044\u306a\u5f15\u6570\u3068\u8fd4\u5024\u306e\u578b\u3092\u8868\u3059\u6587\u5b57\u5217<\/span>\r\nval<\/span> method<\/span> =<\/span> ctClass<\/span>.<\/span>getDeclaredMethods<\/span>.<\/span>find<\/span>(<\/span>method<\/span> =><\/span> {<\/span>\r\n  val<\/span> methodName<\/span> =<\/span> FMLDeobfuscatingRemapper<\/span>.<\/span>INSTANCE<\/span>.<\/span>mapMethodName<\/span>(<\/span>ctClass<\/span>.<\/span>getName<\/span>,<\/span> method<\/span>.<\/span>getName<\/span>,<\/span> method<\/span>.<\/span>getSignature<\/span>)<\/span>\r\n  val<\/span> methodSig<\/span> =<\/span> FMLDeobfuscatingRemapper<\/span>.<\/span>INSTANCE<\/span>.<\/span>mapMethodDesc<\/span>(<\/span>method<\/span>.<\/span>getSignature<\/span>)<\/span>\r\n  \/\/ srg\u540d\u3067\u306a\u3044\u5834\u5408\u3082\u30b7\u30b0\u30cd\u30c1\u30e3\u306e\u6bd4\u8f03\u306f\u3059\u3079\u304d\u3060\u304c\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3055\u308c\u3066\u3044\u306a\u3044\u524d\u63d0\u3067\u7701\u7565<\/span>\r\n  methodName<\/span> ==<\/span> TargetMethodName<\/span> ||<\/span> (<\/span>methodName<\/span> ==<\/span> TargetMethodSrgName<\/span> &&<\/span> methodSig<\/span> ==<\/span> TargetMethodSig<\/span>)<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u662f\u524d\u671f\u51c6\u5907\u7684\u90e8\u5206\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u5c1d\u8bd5\u5b9e\u9645\u4fee\u6539\u4ee3\u7801\u3002<\/p>\n
\u4ee3\u7801\u6539\u51991
\n\u641c\u7d22\u76ee\u6807\u65b9\u6cd5\u7684\u4f4d\u7f6e\uff0c\u6ce8\u5165\u4ee3\u7801\u3002<\/p>\n
method<\/span> match<\/span> {<\/span>\r\n  case<\/span> Some<\/span>(<\/span>m<\/span>)<\/span> =><\/span> \/\/ \u30e1\u30bd\u30c3\u30c9\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408<\/span>\r\n    \/\/ \u30b3\u30fc\u30c9\u306e\u6ce8\u5165<\/span>\r\n    m<\/span>.<\/span>instrument<\/span>(<\/span>new<\/span> ExprEditor<\/span>()<\/span> {<\/span>\r\n      val<\/span> TargetInstanceOfClassName<\/span> =<\/span> FMLDeobfuscatingRemapper<\/span>.<\/span>INSTANCE<\/span>.<\/span>unmap<\/span>(<\/span>\"net\/minecraft\/entity\/player\/EntityPlayerMP\"<\/span>).<\/span>replaceAll<\/span>(<\/span>\"\\\\\/\"<\/span>,<\/span> \".\"<\/span>)<\/span>\r\n\r\n      override<\/span> def<\/span> edit<\/span>(<\/span>i<\/span>:<\/span> Instanceof<\/span>)<\/span>:<\/span> Unit<\/span> =<\/span> {<\/span>\r\n        \/\/ edit\u5185\u3067\u53d6\u308c\u308b\u30af\u30e9\u30b9\u540d\u3084\u30e1\u30bd\u30c3\u30c9\u540d\u306f\u96e3\u8aad\u5316\u5f8c\u306e\u540d\u524d\u3067\u53d6\u308c\u308b\u305f\u3081\u6ce8\u610f<\/span>\r\n        if<\/span> (<\/span>i<\/span>.<\/span>getType<\/span>.<\/span>getName<\/span> ==<\/span> TargetInstanceOfClassName<\/span>)<\/span> {<\/span>\r\n          \/\/ \u30b3\u30fc\u30c9\u306e\u66f8\u304d\u63db\u3048<\/span>\r\n          i<\/span>.<\/span>replace<\/span>(<\/span>\r\n            \"\"\"\r\n              |System.out.println(\"success fire\"); \/\/ \u6ce8\u5165\u3059\u308b\u30b3\u30fc\u30c9\r\n              |$_ = $proceed($$); \/\/ \u5143\u306e\u30b3\u30fc\u30c9\r\n            \"\"\"<\/span>.<\/span>stripMargin<\/span>\r\n          )<\/span>\r\n        }<\/span>\r\n      }<\/span>\r\n    })<\/span>\r\n  case<\/span> _<\/span> =><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5f53\u4f7f\u7528\u8fd9\u6bb5\u4ee3\u7801\u8fd0\u884c\u65f6\uff0c\u6211\u8ba4\u4e3a\u63a7\u5236\u53f0\u5c06\u4f1a\u8f93\u51fa\u201csuccess fire\u201d\u3002\u7531\u4e8e\u4ee3\u7801\u5728\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u90fd\u4f1a\u6267\u884c\uff0c\u6240\u4ee5\u6211\u8ba4\u4e3a\u5b83\u53ef\u80fd\u4f1a\u8f93\u51fa\u4e24\u6b21\uff0c\u4f46\u8fd9\u662f\u6b63\u5e38\u8fd0\u4f5c\u7684\u65b9\u5f0f\u3002<\/p>\n
\u8bf7\u5c06\u4ee3\u7801\u8fdb\u884c\u4fee\u65392
\n\u5982\u679c\u4fdd\u6301\u8fd9\u6837\u7684\u8bdd\u6709\u70b9\u96be\u770b\uff0c\u6211\u4eec\u628aExprEditor\u62c6\u5206\u51fa\u6765\u5427\u3002<\/p>\n
method<\/span> match<\/span> {<\/span>\r\n  case<\/span> Some<\/span>(<\/span>m<\/span>)<\/span> =><\/span> \/\/ \u30e1\u30bd\u30c3\u30c9\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408<\/span>\r\n    \/\/ \u30b3\u30fc\u30c9\u306e\u6ce8\u5165<\/span>\r\n    m<\/span>.<\/span>instrument<\/span>(<\/span>ExprEditorPrintSuccess<\/span>)<\/span>\r\n  case<\/span> _<\/span> =><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\/\/ object\u3068\u306f: https:\/\/dwango.github.io\/scala_text\/object.html<\/span>\r\nobject<\/span> ExprEditorPrintSuccess<\/span> extends<\/span> ExprEditor<\/span> {<\/span>\r\n  val<\/span> TargetInstanceOfClassName<\/span> =<\/span> ClassName<\/span>(<\/span>\"net.minecraft.entity.player.EntityPlayerMP\"<\/span>)<\/span> \/\/ ClassName\u306f\u5143\u306e\u30af\u30e9\u30b9\u540d\u304b\u3089\u96e3\u8aad\u5316\u6e08\u307f\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u3063\u305f\u308a\u3059\u308b\u305f\u3081\u306e\u72ec\u81eacase class<\/span>\r\n\r\n  override<\/span> def<\/span> edit<\/span>(<\/span>i<\/span>:<\/span> Instanceof<\/span>)<\/span>:<\/span> Unit<\/span> =<\/span> {<\/span>\r\n    \/\/ edit\u5185\u3067\u53d6\u308c\u308b\u30af\u30e9\u30b9\u540d\u3084\u30e1\u30bd\u30c3\u30c9\u540d\u306f\u96e3\u8aad\u5316\u5f8c\u306e\u540d\u524d\u3067\u53d6\u308c\u308b\u305f\u3081\u3001\u6bd4\u8f03\u524d\u306b\u9069\u5b9cmap\/unmap\u3059\u308b<\/span>\r\n    if<\/span> (<\/span>i<\/span>.<\/span>getType<\/span>.<\/span>getName<\/span> ==<\/span> TargetInstanceOfClassName<\/span>.<\/span>unmappedName<\/span>)<\/span> {<\/span>\r\n      i<\/span>.<\/span>replace<\/span>(<\/span>\r\n        \"\"\"\r\n          |System.out.println(\"success fire\");\r\n          |$_ = $proceed($$);\r\n        \"\"\"<\/span>.<\/span>stripMargin<\/span>\r\n      )<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8ba9\u6211\u4eec\u5728\u8fd9\u91cc\u8fdb\u884c\u53e6\u4e00\u6b21\u5904\u7406\uff0c\u8fd9\u6b21\u4f7f\u7528\u6253\u706b\u77f3\u65f6\u5728\u804a\u5929\u4e2d\u663e\u793a\u6587\u672c\u3002
\n\u4e3a\u4e86\u5728\u804a\u5929\u4e2d\u663e\u793a\uff0c\u6211\u4eec\u5c06\u4e0b\u9762\u7684\u65b9\u6cd5\u5207\u5206\u51fa\u6765\u3002<\/p>\n
object<\/span> StatusBoneFireLit<\/span> {<\/span>\r\n  def<\/span> send<\/span>(<\/span>player<\/span>:<\/span> EntityPlayer<\/span>)<\/span>:<\/span> Unit<\/span> =<\/span> {<\/span>\r\n    if<\/span> (<\/span>player<\/span>.<\/span>isInstanceOf<\/span>[<\/span>EntityPlayerMP<\/span>])<\/span> {<\/span>\r\n      player<\/span>.<\/span>sendStatusMessage<\/span>(<\/span>new<\/span> TextComponentString<\/span>(<\/span>\"\u00a7eBONEFIRE LIT\"<\/span>),<\/span> true<\/span>)<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u8bd5\u7740\u5728\u4e4b\u524d\u76f8\u540c\u7684\u4f4d\u7f6e\u4e0a\u91cd\u65b0\u6539\u5199\u4ee3\u7801\uff0c\u4f7f\u5176\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u3002<\/p>\n
method<\/span> match<\/span> {<\/span>\r\n  case<\/span> Some<\/span>(<\/span>m<\/span>)<\/span> =><\/span>\r\n    \/\/ \u30b3\u30fc\u30c9\u306e\u6ce8\u5165<\/span>\r\n    m<\/span>.<\/span>instrument<\/span>(<\/span>ExprEditorStatusMessage<\/span>)<\/span>\r\n  case<\/span> _<\/span> =><\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
object<\/span> ExprEditorStatusMessage<\/span> extends<\/span> ExprEditor<\/span> {<\/span>\r\n  val<\/span> TargetInstanceOfClassName<\/span> =<\/span> ClassName<\/span>(<\/span>\"net.minecraft.entity.player.EntityPlayerMP\"<\/span>)<\/span>\r\n\r\n  val<\/span> PlayerClassName<\/span> =<\/span> ClassName<\/span>(<\/span>\"net.minecraft.entity.player.EntityPlayer\"<\/span>)<\/span>\r\n\r\n  override<\/span> def<\/span> edit<\/span>(<\/span>i<\/span>:<\/span> Instanceof<\/span>)<\/span>:<\/span> Unit<\/span> =<\/span> {<\/span>\r\n    \/\/ edit\u5185\u3067\u53d6\u308c\u308b\u30af\u30e9\u30b9\u540d\u3084\u30e1\u30bd\u30c3\u30c9\u540d\u306f\u96e3\u8aad\u5316\u5f8c\u306e\u540d\u524d\u3067\u53d6\u308c\u308b\u305f\u3081\u3001\u6bd4\u8f03\u524d\u306b\u9069\u5b9cmap\/unmap\u3059\u308b<\/span>\r\n    if<\/span> (<\/span>i<\/span>.<\/span>getType<\/span>.<\/span>getName<\/span> ==<\/span> TargetInstanceOfClassName<\/span>.<\/span>unmappedName<\/span>)<\/span> {<\/span>\r\n      definePlaceholder<\/span>(<\/span>\"com.yukiaji.javassistsample.main\"<\/span>,<\/span> \"StatusBoneFireLit\"<\/span>,<\/span> \"send\"<\/span>,<\/span> List<\/span>(<\/span>ClassName<\/span>(<\/span>\"net.minecraft.entity.player.EntityPlayer\"<\/span>)),<\/span> ClassName<\/span>.<\/span>Void<\/span>,<\/span> Modifier<\/span>.<\/span>PUBLIC<\/span> |<\/span> Modifier<\/span>.<\/span>STATIC<\/span>)<\/span>\r\n      \/\/ \u2191 ?<\/span>\r\n\r\n      i<\/span>.<\/span>replace<\/span>(<\/span>\r\n        \"\"\"\r\n          |com.yukiaji.javassistsample.main.StatusBoneFireLit.send((%s)$1);\r\n          |$_ = $proceed($$);\r\n        \"\"\"<\/span>.<\/span>stripMargin<\/span>.<\/span>format<\/span>(<\/span>PlayerClassName<\/span>.<\/span>unmappedName<\/span>)<\/span>\r\n      )<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u73fe\u5728\u5728\u793a\u4f8b\u4ee3\u78bc\u4e2d\u51fa\u73fe\u4e86\u4e00\u500b\u795e\u79d8\u7684\u65b9\u6cd5definePlaceholder\u3002\u6211\u4e0d\u6e05\u695a\u5b83\u662f\u53ea\u5728scala\u4e2d\u51fa\u73fe\u7684\uff0c\u9084\u662f\u8b80\u53d6\u9806\u5e8f\u7684\u554f\u984c\uff0c\u9084\u662f\u53ea\u662f\u500b\u4f8b\u5916\u60c5\u6cc1\u3002\u5728\u958b\u767c\u74b0\u5883\u4e2d\uff0c\u5373\u4f7f\u6211\u5c07\u6b64\u8655\u8a3b\u91cb\u6389\u4e5f\u4e0d\u6703\u6709\u4efb\u4f55\u554f\u984c\uff0c\u4f46\u7576\u6211\u5c07\u5b83\u6253\u5305\u6210jar\u5728\u751f\u7522\u74b0\u5883\u4e2d\u904b\u884c\u6642\uff0cJavassist\u6703\u62b1\u6028\u8aaa\u300ccom.yukiaji.javassistsample.main.StatusBoneFireLit\u4e26\u4e0d\u5b58\u5728\uff01\u300d\u3002\u9019\u662f\u7531\u65bcJavassist\u7121\u6cd5\u8a2a\u554fStatusBoneFireLit\u800c\u5f15\u8d77\u7684\u932f\u8aa4\uff0c\u56e0\u6b64\u5728\u4fee\u6539\u4ee3\u78bc\u4e4b\u524d\uff0c\u6211\u5fc5\u9808\u544a\u8a34Javassist\u9019\u500b\u985e\u6216\u65b9\u6cd5\u7684\u5b58\u5728\u3002\u6240\u4ee5\u6211\u5c07\u5b9a\u7fa9\u4e00\u500b\u865b\u64ec\u7684\u985e\u548c\u65b9\u6cd5\uff0c\u4ee5\u4fbfJavassist\u53ef\u4ee5\u8a2a\u554f\u5230\u3002<\/p>\n
private<\/span> def<\/span> definePlaceholder<\/span>(<\/span>packageName<\/span>:<\/span> String<\/span>,<\/span> className<\/span>:<\/span> String<\/span>,<\/span> methodName<\/span>:<\/span> String<\/span>,<\/span> argTypes<\/span>:<\/span> List<\/span>[<\/span>ClassName<\/span>],<\/span> returnType<\/span>:<\/span> ClassName<\/span>,<\/span> modifiers<\/span>:<\/span> Int<\/span>)<\/span>:<\/span> Unit<\/span> =<\/span> {<\/span>\r\n  val<\/span> pool<\/span> =<\/span> ClassPool<\/span>.<\/span>getDefault<\/span>\r\n  pool<\/span>.<\/span>makePackage<\/span>(<\/span>getClass<\/span>.<\/span>getClassLoader<\/span>,<\/span> packageName<\/span>)<\/span>\r\n  val<\/span> placeholder<\/span> =<\/span> pool<\/span>.<\/span>makeClass<\/span>(<\/span>packageName<\/span> +<\/span> \".\"<\/span> +<\/span> className<\/span>)<\/span>\r\n  \/\/ \u751f\u6210\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u53c2\u7167\u3059\u308b\u30af\u30e9\u30b9\u306f\u3059\u3079\u3066map\u3055\u308c\u308b\u524d\u306e\u30af\u30e9\u30b9\u540d\u3092\u4f7f\u7528\u3059\u308b<\/span>\r\n  var<\/span> argString<\/span> =<\/span> argTypes<\/span>.<\/span>zipWithIndex<\/span>.<\/span>map<\/span>({<\/span> case<\/span> (<\/span>t<\/span>,<\/span> i<\/span>)<\/span> =><\/span> t<\/span>.<\/span>unmappedName<\/span> +<\/span> \" arg\"<\/span> +<\/span> i<\/span> }).<\/span>mkString<\/span>(<\/span>\", \"<\/span>)<\/span> \/\/ type arg1, type arg2, ...<\/span>\r\n  val<\/span> placeholderMethod<\/span> =<\/span> CtMethod<\/span>.<\/span>make<\/span>(<\/span>\r\n    s<\/span>\"\"\"\r\n       |${returnType.unmappedName} $methodName($argString) {\r\n       |    System.out.println(\"WARNING: call placeholder method\");\r\n       |    ${if (returnType != ClassName.Void) \"return null;\" else \"\"}\r\n       |}\"\"\"<\/span>.<\/span>stripMargin<\/span>,<\/span>\r\n    placeholder<\/span>\r\n  )<\/span>\r\n  placeholderMethod<\/span>.<\/span>setModifiers<\/span>(<\/span>modifiers<\/span>)<\/span>\r\n  placeholder<\/span>.<\/span>addMethod<\/span>(<\/span>placeholderMethod<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\u751f\u6210\u7684\u865a\u62df\u7c7b\/\u65b9\u6cd5\u5b9e\u9645\u4e0a\u4e0d\u4f1a\u4f5c\u4e3a\u5b57\u8282\u7801\u8f93\u51fa\uff0c\u6240\u4ee5\u53ea\u8981\u65b9\u6cd5\u5185\u90e8\u7b49\u8bed\u6cd5\u4e0a\u6ca1\u6709\u95ee\u9898\uff0c\u968f\u610f\u7684\u5185\u5bb9\u90fd\u53ef\u4ee5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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