springs-boot-plugin-test/plugin-users/src/main/java/com/plugin/users/utils/ClassLoaderUtil.java

package com.plugin.users.utils;

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;

import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;

/**
 * 类加载器工具类
 *
 * @author zlt
 * @version 1.0
 * @date 2021/10/5
 * <p>
 * Blog: https://zlt2000.gitee.io
 * Github: https://github.com/zlt2000
 */
@Slf4j
public class ClassLoaderUtil {
    private static Method method = Loader_addURL_Method();

    @SneakyThrows
    private static Method Loader_addURL_Method() {
        Method method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
        if (!method.isAccessible()) {
            method.setAccessible(true);
        }
        return method;
    }

    public static ClassLoader getClassLoader(String url) {
        try {
            URLClassLoader classLoader = new URLClassLoader(new URL[]{}, ClassLoaderUtil.class.getClassLoader());
            method.invoke(classLoader, new URL(url));
            return classLoader;
        } catch (Exception e) {
            log.error("getClassLoader-error", e);
            return null;
        }
    }
}