Java反射經(jīng)典實(shí)例 Java Reflection Cookbook

發(fā)布時(shí)間：2020-08-17 18:53:39 來(lái)源：ITPUB博客閱讀：179 作者：smfflynj 欄目：編程語(yǔ)言

http://www.duduwolf.com/wiki/2006/85.html[@more@]import java.lang.reflect.Array;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;

/**
* Java Reflection Cookbook
*
* @author Michael Lee
* @since 2006-8-23
* @version 0.1a
*/
publicclass Reflection {
/**
* 得到某個(gè)對(duì)象的公共屬性
*
* @param owner, fieldName
* @return 該屬性對(duì)象
* @throws Exception
*
*/
public Object getProperty(Object owner, String fieldName) throws Exception {
Class ownerClass = owner.getClass();

Field field = ownerClass.getField(fieldName);

Object property = field.get(owner);

return property;
}

/**
* 得到某類的靜態(tài)公共屬性
*
* @param className 類名
* @param fieldName 屬性名
* @return 該屬性對(duì)象
* @throws Exception
*/
public Object getStaticProperty(String className, String fieldName)
throws Exception {
Class ownerClass = Class.forName(className);

Field field = ownerClass.getField(fieldName);

Object property = field.get(ownerClass);

return property;
}

/**
* 執(zhí)行某對(duì)象方法
*
* @param owner
* 對(duì)象
* @param methodName
* 方法名
* @param args
* 參數(shù)
* @return 方法返回值
* @throws Exception
*/
public Object invokeMethod(Object owner, String methodName, Object[] args)
throws Exception {

Class ownerClass = owner.getClass();

Class[] argsClass =new Class[args.length];

for (int i =0, j = args.length; i < j; i++) {
argsClass[i] = args[i].getClass();
}

Method method = ownerClass.getMethod(methodName, argsClass);

return method.invoke(owner, args);
}

/**
* 執(zhí)行某類的靜態(tài)方法
*
* @param className
* 類名
* @param methodName
* 方法名
* @param args
* 參數(shù)數(shù)組
* @return 執(zhí)行方法返回的結(jié)果
* @throws Exception
*/
public Object invokeStaticMethod(String className, String methodName,
Object[] args) throws Exception {
Class ownerClass = Class.forName(className);

Class[] argsClass =new Class[args.length];

for (int i =0, j = args.length; i < j; i++) {
argsClass[i] = args[i].getClass();
}

Method method = ownerClass.getMethod(methodName, argsClass);

return method.invoke(null, args);
}

/**
* 新建實(shí)例
*
* @param className
* 類名
* @param args
* 構(gòu)造函數(shù)的參數(shù)
* @return 新建的實(shí)例
* @throws Exception
*/
public Object newInstance(String className, Object[] args) throws Exception {
Class newoneClass = Class.forName(className);

Class[] argsClass =new Class[args.length];

for (int i =0, j = args.length; i < j; i++) {
argsClass[i] = args[i].getClass();
}

Constructor cons = newoneClass.getConstructor(argsClass);

return cons.newInstance(args);

}

/**
* 是不是某個(gè)類的實(shí)例
* @param obj 實(shí)例
* @param cls 類
* @return 如果 obj 是此類的實(shí)例，則返回 true
*/
publicboolean isInstance(Object obj, Class cls) {
return cls.isInstance(obj);
}

/**
* 得到數(shù)組中的某個(gè)元素
* @param array 數(shù)組
* @param index 索引
* @return 返回指定數(shù)組對(duì)象中索引組件的值
*/
public Object getByArray(Object array, int index) {
return Array.get(array,index);
}
}

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Java反射經(jīng)典實(shí)例 Java Reflection Cookbook

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