java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
出现:Class<T> entityClass = (Class<T>)((ParameterizedType)getClass().getGenericSuperclass()).getActualTypeArguments()[0];
使用以下工具类方法获取~java.lang.ClassCastException: java.lang.Class cannot be cast to java.lang.reflect.ParameterizedType
package cn.pconline.prolib.util;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
public class GenericsUtils {
/**
* 通过反射,获得定义Class时声明的父类的范型参数的类型.
* 如public BookManager extends GenricManager<Book>
*
* @param clazz The class to introspect
* @return the first generic declaration, or <code>Object.class</code> if cannot be determined
*/
public static Class getSuperClassGenricType(Class clazz) {
return getSuperClassGenricType(clazz, 0);
}
/**
* 通过反射,获得定义Class时声明的父类的范型参数的类型.
* 如public BookManager extends GenricManager<Book>
*
* @param clazz clazz The class to introspect
* @param index the Index of the generic ddeclaration,start from 0.
*/
public static Class getSuperClassGenricType(Class clazz, int index) throws IndexOutOfBoundsException {
Type genType = clazz.getGenericSuperclass();
if (!(genType instanceof ParameterizedType)) {
return Object.class;
}
Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
if (index >= params.length || index < 0) {
return Object.class;
}
if (!(params[index] instanceof Class)) {
return Object.class;
}
return (Class) params[index];
}
}
Class<T> entityClass = GenericsUtils.getSuperClassGenricType(BasicService.class, 0);