本文研究的主要是Java方法签名的获取，下面是具体实现实例。
实例代码：
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package com.yunshouhu;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.lang.reflect.Type;import java.util.Collection;import com.alibaba.fastjson.parser.DefaultJSONParser;import com.alibaba.fastjson.parser.JSONLexer;import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;/** * 获取Java的方法签名，参考javah -jni 类路径/javap -s 类路径。 * @author WuJianHua * @date 2017年9月5日 下午3:25:51 * @url http://blog.csdn.net/earbao */public class ASMUtilsForJavaH { public static void main(String[] args) throws Exception { System.out.println(ASMUtilsForJavaH.getDesc(System.class)); System.out.println(ASMUtilsForJavaH.getDesc(String.class)); System.out.println(ASMUtilsForJavaH.getDesc(Integer.class)); System.out.println(ASMUtilsForJavaH.getDesc(int.class)); Method method=ASMUtilsForJavaH.class.getDeclaredMethod("main", String[].class); System.out.println("javah -jni"); System.out.println(ASMUtilsForJavaH.getDesc(method)); System.out.println(ASMUtilsForJavaH.getType(System.class)); System.out.println(ASMUtilsForJavaH.getType(ASMUtilsForJavaH.class)); } public static Boolean isAndroid(final String vmName) { final String lowerVMName = vmName.toLowerCase(); return lowerVMName.contains("dalvik") || lowerVMName.contains("lemur"); } public static Boolean isAndroid() { return isAndroid(System.getProperty("java.vm.name")); } public static String getDesc(final Method method) { final StringBuffer buf = new StringBuffer(); buf.append("("); final Class<?>[] types = method.getParameterTypes(); for (int i = 0; i < types.length; ++i) { buf.append(getDesc(types[i])); } buf.append(")"); buf.append(getDesc(method.getReturnType())); return buf.toString(); } public static String getDesc(final Class<?> returnType) { if (returnType.isPrimitive()) { return getPrimitiveLetter(returnType); } if (returnType.isArray()) { return "[" + getDesc(returnType.getComponentType()); } return "L" + getType(returnType) + ";"; } public static String getType(final Class<?> parameterType) { if (parameterType.isArray()) { return "[" + getDesc(parameterType.getComponentType()); } if (!parameterType.isPrimitive()) { final String clsName = parameterType.getName(); return clsName.replaceAll("\\.", "/"); } return getPrimitiveLetter(parameterType); } public static String getPrimitiveLetter(final Class<?> type) { if (Integer.TYPE.equals(type)) { return "I"; } if (Void.TYPE.equals(type)) { return "V"; } if (Boolean.TYPE.equals(type)) { return "Z"; } if (Character.TYPE.equals(type)) { return "C"; } if (byte.TYPE.equals(type)) { return "B"; } if (short.TYPE.equals(type)) { return "S"; } if (float.TYPE.equals(type)) { return "F"; } if (long.TYPE.equals(type)) { return "J"; } if (double.TYPE.equals(type)) { return "D"; } throw new IllegalStateException("Type: " + type.getCanonicalName() + " is not a primitive type"); } public static Type getMethodType(final Class<?> clazz, final String methodName) { try { final Method method = clazz.getMethod(methodName, (Class<?>[]) new Class[0]); return method.getGenericReturnType(); } catch (Exception ex) { return null; } } public static Type getFieldType(final Class<?> clazz, final String fieldName) { try { final Field field = clazz.getField(fieldName); return field.getGenericType(); } catch (Exception ex) { return null; } } public static void parseArray(final Collection collection, final ObjectDeserializer deser, final DefaultJSONParser parser, final Type type, final Object fieldName) { final JSONLexer lexer = parser.getLexer(); if (lexer.token() == 8) { lexer.nextToken(16); } parser.accept(14, 14); int index = 0; while (true) { final Object item = deser.deserialze(parser, type, (Object) index); collection.add(item); ++index; if (lexer.token() != 16) { break; } lexer.nextToken(14); } parser.accept(15, 16); }} |
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原文链接：http://blog.csdn.net/earbao/article/details/77852044
