SPI动态加载jar动态加载jar

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动态加载jar

背景

通过UrlClassloader + SPI机制动态加载第三方jar包

代码流程

1、UrlClassloader加载指定目录jar

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 public ClassLoader getClassLoader() throws Exception {
        List<String> filePathList = new ArrayList<>();
        filePathList.add("E:\spi_jar\openstack-driver-1.0.jar");
        filePathList.add("E:\spi_jar\docker-driver-1.0.jar");
        List<URL> urlList = new ArrayList<>();
        for (String path : filePathList) {
            File dockerJarFile = new File(path);
            urlList.add(dockerJarFile.toURI().toURL());
        }

        return new URLClassLoader(urlList.toArray(new URL[]{}), Thread.currentThread().getContextClassLoader());
    }

2、servicelaoder加载类

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public void loadJar() throws Exception{
        ServiceLoader<CloudDriver> cloudDrivers = ServiceLoader.load(CloudDriver.class, getClassLoader());
        for (CloudDriver cloudDriver : cloudDrivers) {
            cloudDriver.createVirtualMachine();
        }
    }