泛型的工具类 – 源码集中营

package cn.itcast.utils; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import java.util.ArrayList; import java.util.List; /** * 泛型工具类 * @author lihuoming * */ public class GenericsUtils { /** * 通过反射,获得指定类的父类的泛型参数的实际类型. 如BuyerServiceBean extends DaoSupport<Buyer> * * @param clazz clazz 需要反射的类,该类必须继承范型父类 * @param index 泛型参数所在索引,从0开始. * @return 范型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked") public static Class getSuperClassGenricType(Class clazz, int index) { Type genType = clazz.getGenericSuperclass();//得到泛型父类 //如果没有实现ParameterizedType接口，即不支持泛型，直接返回Object.class if (!(genType instanceof ParameterizedType)) { return Object.class; } //返回表示此类型实际类型参数的Type对象的数组,数组里放的都是对应类型的Class, 如BuyerServiceBean extends DaoSupport<Buyer,Contact>就返回Buyer和Contact类型 Type[] params = ((ParameterizedType) genType).getActualTypeArguments(); if (index >= params.length || index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } if (!(params[index] instanceof Class)) { return Object.class; } return (Class) params[index]; } /** * 通过反射,获得指定类的父类的第一个泛型参数的实际类型. 如BuyerServiceBean extends DaoSupport<Buyer> * * @param clazz clazz 需要反射的类,该类必须继承泛型父类 * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked") public static Class getSuperClassGenricType(Class clazz) { return getSuperClassGenricType(clazz,0); } /** * 通过反射,获得方法返回值泛型参数的实际类型. 如: public Map<String, Buyer> getNames(){} * * @param Method method 方法 * @param int index 泛型参数所在索引,从0开始. * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked") public static Class getMethodGenericReturnType(Method method, int index) { Type returnType = method.getGenericReturnType(); if(returnType instanceof ParameterizedType){ ParameterizedType type = (ParameterizedType) returnType; Type[] typeArguments = type.getActualTypeArguments(); if (index >= typeArguments.length || index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } return (Class)typeArguments[index]; } return Object.class; } /** * 通过反射,获得方法返回值第一个泛型参数的实际类型. 如: public Map<String, Buyer> getNames(){} * * @param Method method 方法 * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked") public static Class getMethodGenericReturnType(Method method) { return getMethodGenericReturnType(method, 0); } /** * 通过反射,获得方法输入参数第index个输入参数的所有泛型参数的实际类型. 如: public void add(Map<String, Buyer> maps, List<String> names){} * * @param Method method 方法 * @param int index 第几个输入参数 * @return 输入参数的泛型参数的实际类型集合, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回空集合 */ @SuppressWarnings("unchecked") public static List<Class> getMethodGenericParameterTypes(Method method, int index) { List<Class> results = new ArrayList<Class>(); Type[] genericParameterTypes = method.getGenericParameterTypes(); if (index >= genericParameterTypes.length ||index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } Type genericParameterType = genericParameterTypes[index]; if(genericParameterType instanceof ParameterizedType){ ParameterizedType aType = (ParameterizedType) genericParameterType; Type[] parameterArgTypes = aType.getActualTypeArguments(); for(Type parameterArgType : parameterArgTypes){ Class parameterArgClass = (Class) parameterArgType; results.add(parameterArgClass); } return results; } return results; } /** * 通过反射,获得方法输入参数第一个输入参数的所有泛型参数的实际类型. 如: public void add(Map<String, Buyer> maps, List<String> names){} * * @param Method method 方法 * @return 输入参数的泛型参数的实际类型集合, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回空集合 */ @SuppressWarnings("unchecked") public static List<Class> getMethodGenericParameterTypes(Method method) { return getMethodGenericParameterTypes(method, 0); } /** * 通过反射,获得Field泛型参数的实际类型. 如: public Map<String, Buyer> names; * * @param Field field 字段 * @param int index 泛型参数所在索引,从0开始. * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked") public static Class getFieldGenericType(Field field, int index) { Type genericFieldType = field.getGenericType(); if(genericFieldType instanceof ParameterizedType){ ParameterizedType aType = (ParameterizedType) genericFieldType; Type[] fieldArgTypes = aType.getActualTypeArguments(); if (index >= fieldArgTypes.length || index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } return (Class)fieldArgTypes[index]; } return Object.class; } /** * 通过反射,获得Field泛型参数的实际类型. 如: public Map<String, Buyer> names; * * @param Field field 字段 * @param int index 泛型参数所在索引,从0开始. * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked") public static Class getFieldGenericType(Field field) { return getFieldGenericType(field, 0); } } package cn.itcast.utils; import java.lang.refl</p></div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" /> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-icons/1.9.1/font/bootstrap-icons.min.css" integrity="sha512-5PV92qsds/16vyYIJo3T/As4m2d8b6oWYfoqV+vtizRB6KhF1F9kYzWzQmsO6T3z3QG2Xdhrx7FQ+5R1LiQdUA==" 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