Question

反射中如何区分参数是基本类型还是所对应的包装类

Answer 1

package demo.test; import java.lang.reflect.Method; /** * Java Reflection Cookbook<br/> * eg:<br/> * Reflection r = new Reflection(A.class);<br/> * Reflection r = new Reflection("com.ehi.A");<br/> */ @SuppressWarnings("unchecked") public class Reflection { private Class clazz; private Object object; private Reflection() { } /** * construct method * @param obj */ public Reflection(Object obj) { this.object = obj; clazz = obj.getClass(); } /** * construct method * @param className * @throws Exception */ public Reflection(String className) throws Exception { if (className == null) clazz = null; else clazz = Class.forName(className); this.object = clazz.newInstance(); } /** * 根据方法名，参数，查找对应的方法，并执行 * * @param methodName * 方法名 * @param args * 参数 * @return 方法返回值 * @throws Exception */ public Object invoke(String methodName, Object[] args) throws Exception { Class[] parameterTypes = getParameterTypes(args); Method method = clazz.getDeclaredMethod(methodName, parameterTypes); method.setAccessible(true); return method.invoke(object, args); } private Class[] getParameterTypes(Object[] args) throws Exception { if(args == null){ return null; } Class[] parameterTypes = new Class[args.length]; for (int i = 0, j = args.length; i < j; i++) { if(args[i] instanceof Integer){ parameterTypes[i] = Integer.TYPE; }else if(args[i] instanceof Byte){ parameterTypes[i] = Byte.TYPE; }else if(args[i] instanceof Short){ parameterTypes[i] = Short.TYPE; }else if(args[i] instanceof Float){ parameterTypes[i] = Float.TYPE; }else if(args[i] instanceof Double){ parameterTypes[i] = Double.TYPE; }else if(args[i] instanceof Character){ parameterTypes[i] = Character.TYPE; }else if(args[i] instanceof Long){ parameterTypes[i] = Long.TYPE; }else if(args[i] instanceof Boolean){ parameterTypes[i] = Boolean.TYPE; }else{ parameterTypes[i] = args[i].getClass(); } } return parameterTypes; } public void print(Integer i){ System.out.println("Integer: "+i.intValue()); } public void print(int i){ System.out.println("int: "+i); } public static boolean isWrapClass(Class clz) { try { return ((Class) clz.getField("TYPE").get(null)).isPrimitive(); } catch (Exception e) { return false; } } public static void main(String[] args) throws Exception { Reflection r = new Reflection(new Reflection()); Object[] obj = new Object[1]; int i = 333; obj[0] = i; //Integer I = new Integer(333); //obj[0] = I; r.invoke("print", obj); } } invoke要实现的是根据方法名和输入的参数自动查找对应的方法，并执行之。遇到的问题就是如何区分Object[]里面存储的是一个基本类型还是其对应的包装类？或者这样的思路根本就是有问题的，请提供下其他的思路。