反射机制下的Java动态加载方法
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/**
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* 反射机制下的方法调用
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* @param className String 类名
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* @param methodName String 方法名
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* @param parameterClasses Class[] 参数类型
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* @param parameterObjects Object[] 参数内容
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* @return Object 返回值
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*/
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private Object reflectClassFunByName(String className,
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String methodName,
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Class[] parameterClasses,
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Object[] parameterObjects)
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{
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Object instance = null;
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Class instanceClass = null;
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try
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{
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instanceClass = Class.forName(className);
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instance = instanceClass.newInstance();
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}
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catch(Exception ex)
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{
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logger.error("Look for the class with exception:", ex);
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return null;
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}
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return reflectClassFunByInstance(instance, methodName, parameterClasses, parameterObjects);
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}
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/**
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* 反射机制下的方法调用
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* @param className Object 实例
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* @param methodName String 方法名
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* @param parameterClasses Class[] 参数类型
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* @param parameterObjects Object[] 参数内容
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* @return Object 返回值
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*/
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private Object reflectClassFunByInstance(Object instance,
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String methodName,
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Class[] parameterClasses,
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Object[] parameterObjects)
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{
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if(instance == null)
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{
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logger.error("Instance is null !");
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return null;
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}
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Method method = null;
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try
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{
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method = instance.getClass().getMethod(methodName,
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parameterClasses);
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return method.invoke(instance, parameterObjects);
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}
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catch(Exception ex)
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{
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logger.error("Didn't find the method : ", ex);
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}
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return null;
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}
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