调用方法

/**
 * nowjava 提 供 
**/


//package com.nowjava;


import java.lang.reflect.Method;

import java.util.HashMap;


public class Main {

    private static HashMap<String, Method> sMethodCache = new HashMap<String, Method>();

    private static HashMap<Class<?>, Class<?>> primativeClassMap = new HashMap<Class<?>, Class<?>>();


    public static Object callMethod(Object object, String methodName,

            Object... args) {

        Object result = null;

        Class<?> clazz = object.getClass();

        result = callMethod(clazz, object, methodName, args);

        return result;

    }

    /**
    时代Java - nowjava.com
    **/

    public static Object callMethod(Class<?> clazz, Object object,

            String methodName, Object... args) {

        Object result = null;

        Class<?>[] argsClasses = getArgsTypes(args);

        try {

            Method method = getMethodBestMatch(clazz, methodName,

                    argsClasses);

            result = method.invoke(object, args);

        } catch (Throwable e) {

            e.printStackTrace();

        }

        return result;

    }


    public static Class<?> getClass(String className) {

        Class<?> clazz = null;

        try {

            clazz = Class.forName(className);

        } catch (ClassNotFoundException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

        return clazz;

    }


    public static Class<?> getClass(String className,

            boolean shouldInitialize, ClassLoader classLoader) {

        Class<?> clazz = null;

        try {

            clazz = Class.forName(className, shouldInitialize, classLoader);

        } catch (ClassNotFoundException e) {

            e.printStackTrace();

        }

        return clazz;

    }


    private static Class<?>[] getArgsTypes(Object... args) {

        Class<?>[] argClasses = new Class<?>[args.length];

        for (int i = 0; i < args.length; i++) {

            argClasses[i] = (args[i] != null) ? args[i].getClass() : null;

            i++;

        }

        return argClasses;

    }


    private static Method getMethodBestMatch(Class<?> clazz,

            String methodName, Class<?>... argClasses) throws Throwable {

        String methodFullName = genMethodFullName(clazz, methodName,

                argClasses);

        if (sMethodCache.containsKey(methodFullName))

            return sMethodCache.get(methodFullName);

        for (Method method : clazz.getDeclaredMethods()) {

            if (method.getName().equals(methodName)) {

                Class<?>[] tmpArgs = method.getParameterTypes();

                if (compareArgs(tmpArgs, argClasses)) {

                    method.setAccessible(true);

                    sMethodCache.put(methodFullName, method);

                    return method;

                }

            }

        }

        String msg = "";

        for (Class<?> cls : argClasses) {

            msg += cls.getSimpleName() + ",";

        }

        msg = "Can't get method: " + clazz.getSimpleName() + "."

                + methodName + "(" + msg + ")";

        throw new Exception(msg);

    }


    private static String genMethodFullName(Class<?> clazz,

            String methodName, Class<?>... argClasses) {

        StringBuilder name = new StringBuilder();

        name.append(clazz.getName());

        name.append(":");

        name.append(methodName);

        for (int i = 0; i < argClasses.length; i++) {

            if (i == (argClasses.length - 1)) {

                name.append(argClasses[i].getName());

            } else {

                name.append(argClasses[i].getName());

                name.append(",");

            }

        }

        return name.toString();

    }


    private static boolean compareArgs(Class<?>[] dstArgs,

            Class<?>[] origArgs) {

        if (dstArgs.length != origArgs.length)

            return false;

        for (int i = 0; i < dstArgs.length; i++) {

            if (!isChildClass(dstArgs[i], origArgs[i]))

                return false;

        }