87 lines
2.7 KiB
Java
87 lines
2.7 KiB
Java
package ink.wgink.util;
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import org.apache.commons.lang3.StringUtils;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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/**
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* When you feel like quitting. Think about why you started
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* 当你想要放弃的时候，想想当初你为何开始
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*
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* @ClassName: ReflectUtil
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* @Description: 反射工具
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* @Author: WangGeng
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* @Date: 2021/2/25 20:10
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* @Version: 1.0
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**/
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public class ReflectUtil {
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/**
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* 获取单例对象
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*
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* @param className 完整类路径
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* @param superClass 父级类或接口，没有就是当前类
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* @param <T>
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* @return
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* @throws ReflectException
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*/
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public static <T> T getSingleInstance(String className, Class<T> superClass) throws ReflectException {
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return getSingleInstance(className, superClass, null);
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}
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/**
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* 获取单例对象
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*
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* @param className 完整类路径
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* @param superClass 父级类或接口，没有就是当前类
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* @param getInstanceMethodName 单例方法名，默认 getInstance
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* @param <T>
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* @return
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* @throws ReflectException
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*/
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public static <T> T getSingleInstance(String className, Class<T> superClass, String getInstanceMethodName) throws ReflectException {
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if (className == null) {
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throw new ReflectException("className 不能为空");
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}
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if (superClass == null) {
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throw new ReflectException("superClass 不能为空");
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}
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Object singleInstanceObject = null;
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try {
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Class clazz = Class.forName(className);
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Method[] methods = clazz.getDeclaredMethods();
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for (Method method : methods) {
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if (StringUtils.equals(method.getName(), StringUtils.isBlank(getInstanceMethodName) ? "getInstance" : getInstanceMethodName)) {
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singleInstanceObject = method.invoke(null);
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}
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}
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} catch (ClassNotFoundException | IllegalAccessException | InvocationTargetException e) {
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throw new ReflectException(e.getMessage(), e);
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}
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if (singleInstanceObject == null) {
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throw new ReflectException("非单例对象");
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}
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return (T) singleInstanceObject;
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}
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public static class ReflectException extends ReflectiveOperationException {
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public ReflectException() {
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}
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public ReflectException(String message) {
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super(message);
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}
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public ReflectException(String message, Throwable cause) {
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super(message, cause);
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}
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public ReflectException(Throwable cause) {
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super(cause);
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}
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}
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}
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