{"id":10020377,"date":"2024-11-05T14:01:25","date_gmt":"2024-11-05T06:01:25","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020377"},"modified":"2024-11-05T14:01:25","modified_gmt":"2024-11-05T06:01:25","slug":"%e4%b8%80%e8%b5%b7%e5%8d%95%e6%b5%8b%e5%bc%95%e8%b5%b7%e7%9a%84%e9%a1%b9%e7%9b%ae%e5%8a%a0%e8%bd%bd%e5%a4%b1%e8%b4%a5%e6%83%a8%e6%a1%88","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020377","title":{"rendered":"\u4e00\u8d77\u5355\u6d4b\u5f15\u8d77\u7684\u9879\u76ee\u52a0\u8f7d\u5931\u8d25\u60e8\u6848"},"content":{"rendered":"

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\u4e00\u3001\u524d\u8a00<\/strong><\/p>\n

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Powermock - java.lang.IllegalStateException: Failed to transform class\n<\/code><\/pre>\n
\u89e3\u51b3\u5355\u6d4b\u62a5\u9519\u7684\u6587\u7ae0\u94fe\u63a5\uff1a<\/p>\n
https:\/\/stackoverflow.com\/questions\/32854688\/powermock-java-lang-illegalstateexception-failed-to-transform-class<\/a><\/p>\n
\u4e8c\u3001\u95ee\u9898\u590d\u73b0<\/strong><\/p>\n
1\u3001\u524d\u671f\u51c6\u5907<\/strong><\/h2>\n
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UserService<\/code>\u7684\u5b9a\u4e49\uff1a<\/p>\n
public interface UserService {\n    void save(User user);\n}\n<\/code><\/pre>\n
UserServiceImpl<\/code>\u7684\u5b9e\u73b0\u4ee3\u7801\uff1a<\/p>\n
@Service\npublic class UserServiceImpl implements UserService {\n    private UserDao userDao;\n\n    @Autowired\n    public UserServiceImpl(UserDao userDao) {\n        this.userDao = userDao;\n    }\n\n    @Override\n    public void save(User user) {\n        userDao.save(user);\n    }\n}\n<\/code><\/pre>\n
\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528\u4e86Spring\u6846\u67b6\u7684 @Service<\/code>\u548c @Autowired<\/code>\u6ce8\u89e3\uff0c\u4ee5\u4fbf\u8ba9Spring\u6846\u67b6\u81ea\u52a8\u88c5\u914dUserDao<\/code>\u5b9e\u4f8b\u3002<\/p>\n
\u4f46\u662f\uff0c\u5728\u6211\u4eec\u7684POM\u6587\u4ef6\u4e2d\uff0c\u867d\u7136\u6211\u4eec\u6dfb\u52a0\u4e86\u5bf9Spring\u6846\u67b6\u7684\u4f9d\u8d56\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u6dfb\u52a0Javaassist<\/strong>\u5e93\u7684\u4f9d\u8d56\u3002\u800cUserServiceImpl<\/code>\u4e2d\u786e\u5b9e\u4f7f\u7528\u4e86Javaassist<\/strong>\u5e93\u6765\u8fdb\u884c\u5b57\u8282\u7801\u64cd\u4f5c\uff0c UserServiceImpl<\/code>\u7684\u5177\u4f53\u5b9e\u73b0\u4ee3\u7801\uff1a<\/p>\n
public class UserServiceImpl implements UserService {\n    \/\/ ...\n    private static final String USER_CLASS_NAME = "com.example.User";\n\n    private static final Class<?> USER_CLASS;\n\n    static {\n        try {\n            USER_CLASS = Class.forName(USER_CLASS_NAME);\n        } catch (ClassNotFoundException e) {\n            throw new RuntimeException(e);\n        }\n    }\n\n    public void save(User user) {\n        try {\n            \/\/ \u521b\u5efa\u4e00\u4e2aClassPool\u5bf9\u8c61\n            ClassPool cp = ClassPool.getDefault();\n\n            \/\/ \u4eceClassPool\u4e2d\u83b7\u53d6\u4e00\u4e2aCtClass\u5bf9\u8c61\n            CtClass ctClass = cp.get(USER_CLASS_NAME);\n\n            \/\/ \u83b7\u53d6\u65e0\u53c2\u6784\u9020\u5668\n            CtConstructor ctConstructor = ctClass.getDeclaredConstructor(new CtClass[]{});\n\n            \/\/ \u83b7\u53d6save\u65b9\u6cd5\n            CtMethod saveMethod = ctClass.getDeclaredMethod("save");\n\n            \/\/ \u751f\u6210\u4ee3\u7801\n            saveMethod.insertBefore("{System.out.println("\u63d2\u5165\u4ee3\u7801\u524d");}");\n            saveMethod.insertAfter("{System.out.println("\u63d2\u5165\u4ee3\u7801\u540e");}");\n\n            \/\/ \u751f\u6210\u65b0\u7684\u5b57\u8282\u7801\u5e76\u88c5\u8f7d\u5230\u5185\u5b58\n            Class<?> targetClass = ctClass.toClass();\n            Object instance = targetClass.newInstance();\n\n            \/\/ \u8c03\u7528save\u65b9\u6cd5\n            Method method = targetClass.getMethod("save", USER_CLASS);\n            method.invoke(instance, user);\n        } catch (Exception e) {\n            throw new RuntimeException(e);\n        }\n    }\n}\n<\/code><\/pre>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7Javaassist<\/strong>\u5e93\u751f\u6210\u4e86\u4e00\u4e2a\u65b0\u7684\u5b57\u8282\u7801\uff0c\u5e76\u4f7f\u7528\u53cd\u5c04\u673a\u5236<\/strong>\u5c06\u5176\u5b9e\u4f8b\u5316\uff0c\u5e76\u5728\u8c03\u7528save() <\/code>\u65b9\u6cd5\u524d\u540e\u63d2\u5165\u4e86\u4e00\u4e9b\u4ee3\u7801\u3002\u4f46\u662f\uff0c\u7531\u4e8eJavaassist<\/strong>\u5e93\u7f3a\u5931\uff0c\u5bfc\u81f4\u9879\u76ee\u5728\u542f\u52a8<\/strong>\u8fc7\u7a0b\u4e2d\u65e0\u6cd5\u6b63\u786e\u52a0\u8f7dUserServiceImpl<\/code>\u7684\u5b9e\u4f8b\uff0c\u4ece\u800c\u51fa\u73b0\u4e86\u4e0b\u8ff0\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n
2\u3001\u62a5\u9519\u4fe1\u606f<\/strong><\/h2>\n
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org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService' defined in file [C:\/workspace\/project\/target\/classes\/com\/example\/UserServiceImpl.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.example.UserService]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.example.UserService.<init>()\n<\/code><\/pre>\n
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3\u3001\u89e3\u51b3\u65b9\u6848<\/strong><\/h2>\n
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<dependency>\n    <groupId>org.javassist<\/groupId>\n    <artifactId>javassist<\/artifactId>\n    <version>3.27.0-GA<\/version>\n<\/dependency>\n<\/code><\/pre>\n
\u6dfb\u52a0\u4f9d\u8d56\u540e\uff0c\u91cd\u65b0\u7f16\u8bd1\u5e76\u90e8\u7f72\u5e94\u7528\u7a0b\u5e8f\u5373\u53ef\u6b63\u5e38\u8fd0\u884c<\/strong>\u3002<\/p>\n
\u4e09\u3001Javaassist\u5305<\/strong><\/p>\n
1\u3001\u4ec0\u4e48\u662fJavaassist\uff1f<\/strong><\/p>\n
Javaassist<\/strong> \u662f\u7531\u4e1c\u4eac\u5de5\u4e1a\u5927\u5b66\u6570\u5b66\u548c\u8ba1\u7b97\u673a\u79d1\u5b66\u7cfb\u7684 Shigeru Chiba<\/strong> \uff08\u5343\u53f6\u6ecb\uff09\u6559\u6388\u521b\u9020\u7684\u3002Javaassist<\/strong> \u4f5c\u4e3a\u5b9e\u73b0\u52a8\u6001\u5b57\u8282\u7801\u751f\u6210\u7684\u4e00\u4e2a\u5f00\u6e90\u7c7b\u5e93\uff0c\u6781\u5927\u5730\u7b80\u5316\u4e86 Java \u5f00\u53d1\u8005\u5bf9\u5e95\u5c42\u5b57\u8282\u7801\u64cd\u4f5c\u7684\u96be\u5ea6\uff0c\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u66f4\u52a0\u8f7b\u677e\u5730\u5728\u8fd0\u884c\u65f6\u52a8\u6001<\/strong>\u751f\u6210\u7c7b\u3001\u4fee\u6539\u7c7b\u6587\u4ef6\u6765\u8fbe\u5230\u8f7b\u91cf\u7ea7 AOP\u3001ORM\u3001\u57fa\u4e8e\u4ee3\u7406\u7684\u8fdc\u7a0b\u65b9\u6cd5\u8c03\u7528\u7b49\u529f\u80fd\u3002<\/p>\n
(Javaassist<\/strong>\u5df2\u52a0\u5165\u4e86\u5f00\u653e\u6e90\u4ee3\u7801JBoss<\/strong> \u5e94\u7528\u670d\u52a1\u5668\u9879\u76ee,\u901a\u8fc7\u4f7f\u7528Javaassist<\/strong>\u5bf9\u5b57\u8282\u7801\u64cd\u4f5c\u4e3aJBoss<\/strong>\u5b9e\u73b0\u52a8\u6001AOP\u6846\u67b6\u3002)<\/p>\n
2\u3001\u4ec0\u4e48\u662f\u52a8\u6001\u7f16\u7a0b\uff1f<\/strong><\/p>\n
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\u2022\u53cd\u5c04<\/strong><\/p>\n
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\u2022\u52a8\u6001\u7f16\u8bd1<\/strong><\/p>\n
\u52a8\u6001\u7f16\u8bd1<\/strong>\u662f\u4eceJava 6\u5f00\u59cb\u652f\u6301\u7684\uff0c\u4e3b\u8981\u662f\u901a\u8fc7\u4e00\u4e2aJavaCompiler<\/strong>\u63a5\u53e3\u6765\u5b8c\u6210\u7684\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u7f16\u8bd1<\/strong>\u4e00\u4e2a\u5df2\u7ecf\u5b58\u5728\u7684java\u6587\u4ef6\uff0c\u4e5f\u53ef\u4ee5\u5728\u5185\u5b58\u4e2d\u52a8\u6001\u751f\u6210<\/strong>Java\u4ee3\u7801\uff0c\u52a8\u6001\u7f16\u8bd1\u6267\u884c\u3002<\/p>\n
\u2022\u8c03\u7528JavaScript\u5f15\u64ce<\/strong><\/p>\n
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\u2022\u52a8\u6001\u751f\u6210\u5b57\u8282\u7801<\/strong><\/p>\n
\u8fd9\u79cd\u6280\u672f\u901a\u8fc7\u64cd\u4f5cJava\u5b57\u8282\u7801\u7684\u65b9\u5f0f\u5728JVM\u4e2d\u751f\u6210\u65b0\u7c7b\u6216\u8005\u5bf9\u5df2\u7ecf\u52a0\u8f7d\u7684\u7c7b\u52a8\u6001\u6dfb\u52a0\u5143\u7d20\u3002<\/p>\n
3\u3001\u52a8\u6001\u7f16\u7a0b\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898\uff1f<\/strong><\/p>\n
\u5728\u9759\u6001\u8bed\u8a00\u4e2d\u5f15\u5165\u52a8\u6001\u7279\u6027\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u89e3\u51b3\u4e00\u4e9b\u4f7f\u7528\u573a\u666f\u7684\u75db\u70b9\u3002\u5176\u5b9e\u5b8c\u5168\u4f7f\u7528\u9759\u6001\u7f16\u7a0b\u4e5f\u529e\u7684\u5230\uff0c\u53ea\u662f\u4ed8\u51fa\u7684\u4ee3\u4ef7\u6bd4\u8f83\u9ad8\uff0c\u6ca1\u6709\u52a8\u6001\u7f16\u7a0b\u6765\u7684\u4f18\u96c5\u3002\u4f8b\u5982\u4f9d\u8d56\u6ce8\u5165\u6846\u67b6Spring\u4f7f\u7528\u4e86\u53cd\u5c04\uff0c\u800cDagger2 \u5374\u4f7f\u7528\u4e86\u4ee3\u7801\u751f\u6210\u7684\u65b9\u5f0f\uff08APT\uff09\u3002<\/p>\n
\u4f8b\u5982\uff1a<\/strong><\/p>\n
a\uff1a<\/strong> \u5728\u90a3\u4e9b\u4f9d\u8d56\u5173\u7cfb\u9700\u8981\u52a8\u6001\u786e\u8ba4\u7684\u573a\u666f: b\uff1a<\/strong> \u9700\u8981\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u63d2\u5165\u4ee3\u7801\u7684\u573a\u666f\uff0c\u6bd4\u5982\u52a8\u6001\u4ee3\u7406\u7684\u5b9e\u73b0\u3002 c\uff1a<\/strong> \u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u6765\u5b9e\u73b0\u76f8\u5173\u529f\u80fd\u7684\u573a\u666f<\/p>\n
4\u3001Javassit\u4f7f\u7528\u65b9\u6cd5<\/strong><\/p>\n
javassist<\/strong>\u662fjboss<\/strong>\u7684\u4e00\u4e2a\u5b50\u9879\u76ee\uff0c\u5176\u4e3b\u8981\u7684\u4f18\u70b9\uff0c\u5728\u4e8e\u7b80\u5355<\/strong>\uff0c\u800c\u4e14\u5feb\u901f<\/strong>\u3002\u76f4\u63a5\u4f7f\u7528java\u7f16\u7801\u7684\u5f62\u5f0f\uff0c\u800c\u4e0d\u9700\u8981\u4e86\u89e3\u865a\u62df\u673a\u6307\u4ee4\uff0c\u5c31\u80fd\u52a8\u6001<\/strong>\u6539\u53d8\u7c7b\u7684\u7ed3\u6784\uff0c\u6216\u8005\u52a8\u6001<\/strong>\u751f\u6210\u7c7b\u3002<\/p>\n
\u64cd\u4f5cjava\u5b57\u8282\u7801\u7684\u5de5\u5177\u6709\u4e24\u4e2a\u6bd4\u8f83\u6d41\u884c\uff0c\u4e00\u4e2a\u662fASM<\/strong>\uff0c\u4e00\u4e2a\u662fJavassit<\/strong> \u3002<\/p>\n
\u25e6ASM<\/strong> \uff1a\u76f4\u63a5<\/strong>\u64cd\u4f5c\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u6267\u884c\u6548\u7387\u9ad8<\/strong>\uff0c\u8981\u6c42\u4f7f\u7528\u8005\u638c\u63e1<\/strong>Java\u7c7b\u5b57\u8282\u7801\u6587\u4ef6\u683c\u5f0f\u53ca\u6307\u4ee4\uff0c\u5bf9\u4f7f\u7528\u8005\u7684\u8981\u6c42\u6bd4\u8f83\u9ad8\u3002<\/p>\n
\u25e6Javassit<\/strong> \u63d0\u4f9b\u4e86\u66f4\u9ad8\u7ea7\u7684API\uff0c\u6267\u884c\u6548\u7387\u76f8\u5bf9\u8f83\u5dee<\/strong>\uff0c\u4f46\u65e0\u9700\u638c\u63e1\u5b57\u8282\u7801\u6307\u4ee4\u7684\u77e5\u8bc6\uff0c\u5bf9\u4f7f\u7528\u8005\u8981\u6c42\u8f83\u4f4e\u3002<\/p>\n
\u5e94\u7528\u5c42\u9762\u6765\u8bb2\u4e00\u822c\u4f7f\u7528\u5efa\u8bae\u4f18\u5148<\/strong>\u9009\u62e9Javassit\uff0c\u5982\u679c\u540e\u7eed\u53d1\u73b0Javassit \u6210\u4e3a\u4e86\u6574\u4e2a\u5e94\u7528\u7684\u6548\u7387\u74f6\u9888\u7684\u8bdd\u53ef\u4ee5\u518d\u8003\u8651ASM\u3002\u5f53\u7136\u5982\u679c\u5f00\u53d1\u7684\u662f\u4e00\u4e2a\u57fa\u7840\u7c7b\u5e93<\/strong>\uff0c\u6216\u8005\u57fa\u7840\u5e73\u53f0<\/strong>\uff0c\u8fd8\u662f\u76f4\u63a5\u4f7f\u7528ASM\u5427\uff0c\u76f8\u4fe1\u4ece\u4e8b\u8fd9\u65b9\u9762\u5de5\u4f5c\u7684\u5f00\u53d1\u8005\u80fd\u529b\u5e94\u8be5\u6bd4\u8f83\u9ad8\u3002<\/p>\n
Javassist<\/strong>\u4e2d\u6700\u4e3a\u91cd\u8981\u7684\u662fClassPool<\/strong>\uff0cCtClass<\/strong> \uff0cCtMethod<\/strong> \u4ee5\u53ca CtField<\/strong>\u8fd9\u51e0\u4e2a\u7c7b\u3002<\/p>\n<\/p>\n
\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n<\/p>\n
\u2022ClassPool<\/strong>\uff1a\u4e00\u4e2a\u57fa\u4e8eHashMap<\/strong>\u5b9e\u73b0\u7684CtClass<\/strong>\u5bf9\u8c61\u5bb9\u5668\uff0c\u5176\u4e2d\u952e<\/strong>\u662f\u7c7b\u540d\u79f0\uff0c\u503c<\/strong>\u662f\u8868\u793a\u8be5\u7c7b\u7684CtClass<\/strong>\u5bf9\u8c61\u3002\u9ed8\u8ba4\u7684ClassPool<\/strong>\u4f7f\u7528\u4e0e\u5e95\u5c42JVM\u76f8\u540c\u7684\u7c7b\u8def\u5f84\uff0c\u56e0\u6b64\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5411ClassPool<\/strong>\u6dfb\u52a0\u7c7b\u8def\u5f84\u6216\u7c7b\u5b57\u8282\u3002<\/p>\n
\u25e6 getDefault ():<\/strong> \u8fd4\u56de\u9ed8\u8ba4\u7684ClassPool<\/strong> \uff0c\u5355\u4f8b\u6a21\u5f0f\uff0c\u4e00\u822c\u901a\u8fc7\u8be5\u65b9\u6cd5\u521b\u5efa\u6211\u4eec\u7684ClassPool<\/strong>\uff1b<\/p>\n
\u25e6 ****appendClassPath(ClassPath cp), insertClassPath(ClassPath cp) :<\/strong> \u5c06\u4e00\u4e2aClassPath<\/strong>\u52a0\u5230\u7c7b\u641c\u7d22\u8def\u5f84\u7684\u672b\u5c3e\u4f4d\u7f6e\u6216\u63d2\u5165\u5230\u8d77\u59cb\u4f4d\u7f6e\u3002\u901a\u5e38\u901a\u8fc7\u8be5\u65b9\u6cd5\u5199\u5165\u989d\u5916\u7684\u7c7b\u641c\u7d22\u8def\u5f84\uff0c\u4ee5\u89e3\u51b3\u591a\u4e2a\u7c7b\u52a0\u8f7d\u5668\u73af\u5883\u4e2d\u627e\u4e0d\u5230\u7c7b\u95ee\u9898\uff1b<\/p>\n
\u25e6 importPackage(String packageName)<\/strong> :\u5bfc\u5165\u5305\uff1b<\/p>\n
\u25e6 makeClass(String classname)<\/strong> :\u521b\u5efa\u4e00\u4e2a\u7a7a\u7c7b\uff0c\u6ca1\u6709\u53d8\u91cf\u548c\u65b9\u6cd5\uff0c\u540e\u5e8f\u901a\u8fc7CtClass<\/strong>\u7684\u51fd\u6570\u8fdb\u884c\u6dfb\u52a0\uff1b<\/p>\n
\u25e6 get(String classname)\u3001getCtClass(String classname) :<\/strong> \u6839\u636e\u7c7b\u8def\u5f84\u540d\u83b7\u53d6\u8be5\u7c7b\u7684CtClass<\/strong>\u5bf9\u8c61\uff0c\u7528\u4e8e\u540e\u7eed\u7684\u7f16\u8f91\u3002<\/p>\n
\u2022CtClass<\/strong>\uff1a\u8868\u793a\u4e00\u4e2a\u7c7b\uff0c\u8fd9\u4e9bCtClass\u5bf9\u8c61\u53ef\u4ee5\u4eceClassPool\u83b7\u5f97\u3002<\/p>\n
\u25e6debugDump<\/strong>; String\u7c7b\u578b\uff0c\u5982\u679c\u751f\u6210 .class<\/strong>\u6587\u4ef6\uff0c\u4fdd\u5b58\u5728\u8fd9\u4e2a\u76ee\u5f55\u4e0b\u3002<\/p>\n
\u25e6setName(String name)<\/strong> : \u7ed9\u7c7b\u91cd\u547d\u540d;<\/p>\n
\u25e6setSuperclass(CtClass clazz)<\/strong> : \u8bbe\u7f6e\u7236\u7c7b;<\/p>\n
\u25e6addField(CtField f, Initializer init)<\/strong> : \u6dfb\u52a0\u5b57\u6bb5\uff08\u5c5e\u6027\uff09\uff0c\u521d\u59cb\u503c\u89c1CtField\uff1b<\/p>\n
\u25e6addMethod(CtMethod m)<\/strong> : \u6dfb\u52a0\u65b9\u6cd5\uff08\u51fd\u6570\uff09\uff1b<\/p>\n
\u25e6toBytecode()<\/strong> : \u8fd4\u56de\u4fee\u6539\u540e\u7684\u5b57\u8282\u7801\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u4e00\u65e6\u8c03\u7528\u8be5\u65b9\u6cd5\uff0c\u5219\u65e0\u6cd5\u7ee7\u7eed\u4fee\u6539CtClass<\/strong>\uff1b<\/p>\n
\u25e6toClass()<\/strong> : \u5c06\u4fee\u6539\u540e\u7684CtClass<\/strong>\u52a0\u8f7d\u81f3\u5f53\u524d\u7ebf\u7a0b\u7684\u4e0a\u4e0b\u6587\u7c7b\u52a0\u8f7d\u5668\u4e2d\uff0cCtClass<\/strong>\u7684toClass<\/strong>\u65b9\u6cd5\u662f\u901a\u8fc7\u8c03\u7528\u672c\u65b9\u6cd5\u5b9e\u73b0\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u4e00\u65e6\u8c03\u7528\u8be5\u65b9\u6cd5\uff0c\u5219\u65e0\u6cd5\u7ee7\u7eed\u4fee\u6539\u5df2\u7ecf\u88ab\u52a0\u8f7d\u7684CtClass<\/strong>\uff1b<\/p>\n
\u25e6writeFile(String directoryName):<\/strong> \u6839\u636eCtClass<\/strong>\u751f\u6210 .class<\/strong> \u6587\u4ef6\uff1b<\/p>\n
\u25e6defrost()<\/strong> : \u89e3\u51bb\u7c7b\uff0c\u7528\u4e8e\u4f7f\u7528\u4e86toclass()<\/strong> \u3001toBytecode<\/strong>\u3001writeFile()<\/strong> \uff0c\u7c7b\u5df2\u7ecf\u88abJVM\u52a0\u8f7d\uff0cJavassist\u51bb\u7ed3CtClass\u540e\uff1b<\/p>\n
\u25e6detach()<\/strong> : \u907f\u514d\u5185\u5b58\u6ea2\u51fa\uff0c\u4eceClassPool<\/strong>\u4e2d\u79fb\u9664\u4e00\u4e9b\u4e0d\u9700\u8981\u7684CtClass<\/strong>\u3002<\/p>\n
\u2022CtMethods<\/strong>\uff1a\u8868\u793a\u7c7b\u4e2d\u7684\u65b9\u6cd5\u3002<\/p>\n
\u25e6insertBefore(String src)<\/strong> :\u5728\u65b9\u6cd5\u7684\u8d77\u59cb\u4f4d\u7f6e\u63d2\u5165\u4ee3\u7801\uff1b<\/p>\n
\u25e6insertAfter(String src)<\/strong> :\u5728\u65b9\u6cd5\u7684\u6240\u6709 return \u8bed\u53e5\u524d\u63d2\u5165\u4ee3\u7801\u4ee5\u786e\u4fdd\u8bed\u53e5\u80fd\u591f\u88ab\u6267\u884c\uff0c\u9664\u975e\u9047\u5230exception\uff1b<\/p>\n
\u25e6insertAt(int lineNum, String src)<\/strong> :\u5728\u6307\u5b9a\u7684\u4f4d\u7f6e\u63d2\u5165\u4ee3\u7801\uff1b<\/p>\n
\u25e6addCatch(String src, CtClass exceptionType)<\/strong> :\u5c06\u65b9\u6cd5\u5185\u8bed\u53e5\u4f5c\u4e3atry\u7684\u4ee3\u7801\u5757\uff0c\u63d2\u5165catch\u4ee3\u7801\u5757src;<\/p>\n
\u25e6setBody(String src)<\/strong> :\u5c06\u65b9\u6cd5\u7684\u5185\u5bb9\u8bbe\u7f6e\u4e3a\u8981\u5199\u5165\u7684\u4ee3\u7801\uff0c\u5f53\u65b9\u6cd5\u88ab abstract\u4fee\u9970\u65f6\uff0c\u8be5\u4fee\u9970\u7b26\u88ab\u79fb\u9664\uff1b<\/p>\n
\u25e6setModifiers(int mod)<\/strong> :\u8bbe\u7f6e\u8bbf\u95ee\u7ea7\u522b\uff0c\u4e00\u822c\u4f7f\u7528Modifier\u8c03\u7528\u5e38\u91cf;<\/p>\n
\u25e6invoke(Object obj, Object… args)<\/strong> :\u53cd\u5c04\u8c03\u7528\u5b57\u8282\u7801\u751f\u6210\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n
\u2022CtFields<\/strong> \uff1a\u8868\u793a\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002<\/p>\n
\u25e6CtField(CtClass type, String name, CtClass declaring)<\/strong> :\u6784\u9020\u51fd\u6570\uff0c\u6dfb\u52a0\u5b57\u6bb5\u7c7b\u578b\uff0c\u540d\u79f0\uff0c\u6240\u5c5e\u7684\u7c7b;<\/p>\n
\u25e6CtField.Initializer constant()<\/strong> :CtClass<\/strong>\u4f7f\u7528addField<\/strong>\u65f6\u521d\u59cb\u503c\u7684\u8bbe\u7f6e;<\/p>\n
\u25e6setModifiers(int mod)<\/strong> :\u8bbe\u7f6e\u8bbf\u95ee\u7ea7\u522b\uff0c\u4e00\u822c\u4f7f\u7528Modifier<\/strong>\u8c03\u7528\u5e38\u91cf\u3002<\/p>\n
\u2022 $\u5f00\u5934\u7684\u7279\u6b8a\u5b57\u7b26<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7b26\u53f7<\/th>\n\u5177\u4f53\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n
$0, $1, $2, \u2026<\/td>\n$0=this,$1\u8868\u793a\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u4f9d\u6b21\u7c7b\u63a8\uff0c\u5982\u679c\u65b9\u6cd5\u662f\u9759\u6001\u7684\uff0c\u5219 $0 \u4e0d\u53ef\u7528<\/td>\n<\/tr>\n
$args<\/td>\n\u65b9\u6cd5\u53c2\u6570\u6570\u7ec4.\u5b83\u7684\u7c7b\u578b\u4e3a Object[]\uff0c$args[0]=1 , 1,1,args[1]=$2<\/td>\n<\/tr>\n
$r<\/td>\n\u8fd4\u56de\u7ed3\u679c\u7684\u7c7b\u578b\uff0c\u7528\u4e8e\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/td>\n<\/tr>\n
$w<\/td>\n\u5305\u88c5\u5668\u7c7b\u578b\uff0c\u7528\u4e8e\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff0c\u5f53\u8fd4\u56de\u503c\u662f\u5305\u88c5\u7c7b\u578b\u65f6\uff0c\u53ef\u4ee5\u7528\u6b64\u6765\u5f3a\u8f6c<\/td>\n<\/tr>\n
$\/_<\/td>\n\u8fd4\u56de\u503c\uff0c\u4e00\u822c\u5728insertAfter\u4e2d\u7528\u5230\uff0c\u7528\u4e8e\u5f97\u5230\u539f\u65b9\u6cd5\u7684\u8fd4\u56de\u503c<\/td>\n<\/tr>\n
$slg<\/td>\n\u53c2\u6570\u7c7b\u578b\u6570\u7ec4\uff0c$sig[0]\u8868\u793a\u7b2c\u4e00\u4e2a\u53c2\u6570\u7c7b\u578b<\/td>\n<\/tr>\n
$type<\/td>\n\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u4e00\u822c\u5728insertAfter\u4e2d\u7528\u5230\uff0c\u5373$\/_\u7684\u7c7b\u578b<\/td>\n<\/tr>\n
$class<\/td>\n$0\u6216this\u7684\u7c7b\u578b<\/td>\n<\/tr>\n
$e<\/td>\n\u5f02\u5e38\u7c7b\u578b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
5\u3001\u5e38\u7528\u7684Java\u63d2\u6869\u5de5\u5177\u6709\u54ea\u4e9b\uff1f<\/strong><\/p>\n
Java \u63d2\u6869\u5de5\u5177<\/strong>\u662f\u4e00\u79cd\u80fd\u591f\u4fee\u6539 Java \u5b57\u8282\u7801<\/strong>\u7684\u5de5\u5177\uff0c\u901a\u8fc7\u5728\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u65f6\u52a8\u6001<\/strong>\u4fee\u6539\u5b57\u8282\u7801\u6765\u5b9e\u73b0\u5bf9\u7a0b\u5e8f\u7684\u76d1\u63a7<\/strong>\u3001\u8ddf\u8e2a<\/strong>\u3001\u8c03\u8bd5<\/strong>\u548c\u4f18\u5316<\/strong>\u7b49\u529f\u80fd\u3002<\/p>\n\n\n\n\n\n\n\n
\u5de5\u5177<\/th>\n\u5b57\u8282\u7801\u62bd\u8c61\u7ea7\u522b<\/th>\n\u5177\u4f53\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
ASM\u3001BCEL<\/td>\n\u4f4e\u7ea7<\/td>\n\u5e93\u9700\u8981\u76f4\u63a5\u5728\u5b57\u8282\u7801\u7ea7\u522b\u4e0a\u8fdb\u884c\u64cd\u4f5c\u3002\u901a\u5e38\uff0c\u5b83\u4eec\u63d0\u4f9b\u5927\u591a\u6570\u529f\u80fd\u4e30\u5bcc\u7684\u529f\u80fd\uff0c\u4f46\u4e0e\u5176\u4ed6\u5b57\u8282\u7801\u64cd\u4f5c\u5de5\u5177\u76f8\u6bd4\uff0c\u5b83\u4eec\u7684\u4f7f\u7528\u4e5f\u6700\u590d\u6742\u3002<\/td>\n<\/tr>\n
Javaassist<\/td>\n\u4e2d\u7ea7<\/td>\n\u5e93\u63d0\u4f9b\u4e86\u5b57\u8282\u7801\u7684\u67d0\u79cd\u62bd\u8c61\u7ea7\u522b\uff0c\u5e76\u7b80\u5316\u4e86\u5176\u4fee\u6539\u3002\u4f8b\u5982\uff0c\u4ee3\u66ff\u4fee\u6539\u5b57\u8282\u7801\uff0c\u53ef\u4ee5\u4f7f\u7528\u7c7b\u4f3c\u4e8eJava\u7684\u8bed\u6cd5\u8fdb\u884c\u66f4\u6539\uff0c\u7136\u540e\u5c06\u5176\u7f16\u8bd1\u4e3a\u5b57\u8282\u7801\uff0c\u7136\u540e\u7531\u4f7f\u7528\u7684\u5e93\u4fee\u6539\u4e3a\u539f\u59cb\u5b57\u8282\u7801\u3002\u901a\u5e38\uff0c\u5b83\u4eec\u7f3a\u5c11\u4fee\u6539\u540e\u7684\u4ee3\u7801\u9a8c\u8bc1\u7684\u529f\u80fd-\u8fd9\u610f\u5473\u7740\uff0c\u9519\u8bef\u53ef\u80fd\u5728\u4fee\u6539\u51c6\u5907\u8fc7\u7a0b\u4e2d\u88ab\u5ffd\u7565\uff0c\u7136\u540e\u5728\u8fd0\u884c\u65f6\u88ab\u53d1\u73b0\u3002<\/td>\n<\/tr>\n
AspectJ\u3001CGLib<\/td>\n\u9ad8\u7ea7<\/td>\n\u5e93\u4f7f\u7528\u9ad8\u7ea7\u6307\u4ee4\u8fdb\u884c\u64cd\u4f5c\uff0c\u5e76\u4e14\u901a\u5e38\u914d\u5907\u6709\u7528\u4e8e\u8bed\u6cd5\u9a8c\u8bc1\u7684\u5de5\u5177\u96c6\u3002\u4e0d\u5e78\u7684\u662f\uff0c\u4ece\u4fee\u6539\u540e\u7684\u5b57\u8282\u7801\u8fdb\u884c\u7684\u6700\u9ad8\u62bd\u8c61\u5316\u901a\u5e38\u4f1a\u5bfc\u81f4\u67d0\u4e9b\u529f\u80fd\u7684\u4e27\u5931\uff0c\u8fd9\u4e9b\u529f\u80fd\u4ec5\u5728\u76f4\u63a5\u4fee\u6539\u5b57\u8282\u7801\u65f6\u53ef\u7528\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\u56db\u3001\u603b\u7ed3<\/strong><\/h2>\n
\u672c\u6587\u901a\u8fc7\u5bf9\u7531\u4e8eJavaassist<\/strong>\u5305\u7f3a\u5931\u5bfc\u81f4\u9879\u76ee\u542f\u52a8\u8fc7\u7a0b\u4e2dbean<\/strong>\u52a0\u8f7d\u5931\u8d25\u7684\u95ee\u9898\u8fdb\u884c\u590d\u73b0\uff0c\u5e76\u901a\u8fc7demo\u8fdb\u884c\u5b9e\u4f8b\u5206\u6790\uff0c\u89e3\u91ca\u4e86\u56e0\u4e3a\u7f3a\u5931Javaassist<\/strong>\u5e93\u5bfc\u81f4\u7684\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u5931\u8d25\u95ee\u9898\u3002\u5e76\u5bf9Javaassist<\/strong>\u5305\u76f8\u5173\u77e5\u8bc6\u8fdb\u884c\u4ecb\u7ecd\uff0c\u540e\u7eed\u4f1a\u7ee7\u7eed\u5bf9Javaassist<\/strong>\u76f8\u5173\u77e5\u8bc6\u8fdb\u884c\u5b66\u4e60\u8865\u5145\u3002<\/p>\n
\u5efa\u8bae\u5927\u5bb6\u5728\u6784\u5efaMaven\u9879\u76ee\u65f6\uff0c\u4ed4\u7ec6\u68c0\u67e5POM\u6587\u4ef6\u4e2d\u7684\u4f9d\u8d56\uff0c\u786e\u4fdd\u6ca1\u6709\u6f0f\u6389\u4efb\u4f55\u5fc5\u8981\u7684\u5e93\uff0c\u4ee5\u514d\u56e0\u4e3a\u9057\u6f0f\u800c\u5f15\u8d77\u4e0d\u5fc5\u8981\u7684\u95ee\u9898\u3002<\/p>\n
https:\/\/segmentfault.com\/a\/1190000045448510<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4f5c\u8005\uff1a\u4eac\u4e1c\u79d1\u6280 \u5b8b\u6167\u8d85 \u4e00\u3001\u524d\u8a00 \u6700\u8fd1\u5728\u5f00\u53d1\u4e00\u4e2a\u529f\u80fd\u6a21\u5757\u65f6\uff0c\u5728\u529f\u80fd\u81ea\u6d4b\u9636\u6bb5\uff0c\u901a\u8fc7\u4f7f\u7528\u5355\u6d4b\u6d4b\u8bd5\u529f\u80fd\u7684\u5b8c\u6574\u6027\uff0c\u5728\u6d4b […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10020377","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10020377","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10020377"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10020377\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10020377"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10020377"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10020377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}