自定义类加载器国密版本冲突

对接三方接口经常使用到国密加密包（bcprov），此时系统已经引入了1.5版本，而三方提供的sdk中引用了1.6版版本，两个版本有冲突，如果系统加载到1.5版本的将会加密异常(各种奇怪的异常)，本文的解决方案是指定一个类加载器，完成指定加载sdk和1.6版本的加密包

自定义类类加载器

package com.huakai.springenv.config.test;
 
import java.net.URL;
import java.net.URLClassLoader;
 
public class IsolatedClassLoader extends URLClassLoader {
 
    private final ClassLoader parent;
 
    public IsolatedClassLoader(URL[] urls, ClassLoader parent) {
        super(urls, parent);
        this.parent = parent;
    }
 
    @Override
    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
        synchronized (getClassLoadingLock(name)) {
            Class<?> c = findLoadedClass(name);
            if (c == null) {
                try{
                    c = this.findClass(name);
                }catch (Exception e){
 
                }
 
                if (c == null) {
                    try {
                        c = this.parent.loadClass(name);
                    } catch (ClassNotFoundException e) {
                        e.printStackTrace();
                    }
                }
            }
            if (resolve) {
                resolveClass(c);
            }
            return c;
        }
    }
}

使用sdk

    private  OpenBankHttpClient getOpenBankHttpClient() throws ClassNotFoundException, NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException, IOException {
    	// 指定版本的加密包
        URL urlbc = AbcMarketingConfig.class.getClassLoader().getResource("./abc/bcprov-jdk15on-1.68");
        // 三方sdk
        URL urlSM2SdkImpl = AbcMarketingConfig.class.getClassLoader().getResource("./abc/openbank-sdk-java-sm");
        URL[] urls= new URL[] {urlbc,urlSM2SdkImpl};
        IsolatedClassLoader sdkClassLoader = new IsolatedClassLoader(urls, AbcMarketingConfig.class.getClassLoader());
        // 使用自定义类加载器加载三方SDK的主类
        Class<?> requestParamsClass = sdkClassLoader.loadClass("com.abchina.openbank.OpenBankHttpClient");
        // 获取私有构造函数
        Constructor<?> constructor = requestParamsClass.getDeclaredConstructor();
        // 设置构造函数可访问
        constructor.setAccessible(true);
        // 使用构造函数创建对象
        return (OpenBankHttpClient) constructor.newInstance();
    }