方式一： 从接口到文件服务器下载jar包到本地服务器，并解析jar包
// 文件服务器地址通过接口方式下载，jar包String fileId = "http://192.168.20.200:端口号/xxx/xxx/xxx.jar";// 本地下载文件// String fileId = "/xxx/xxx/xxx.jar";String className = "类名";// 解析jar 传入jar文件路径Class<?> clazz = getClassesFromJar(fileId, className);if (clazz == null) {log.error("jar包中类名不匹配！");return R.error().message("jar包中类名不匹配！");}// 如果不是静态方法创建新的对象//Object ob = clazz.newInstance();// 获取方法Method method = clazz.getMethod(methodName, String.class, String.class);if (method == null) {log.error("jar包中方法名不匹配！");return R.error().message("jar包中方法名不匹配！");}if (method.getParameterTypes().length == 0) {log.error("解析方法参数为空，检查jar包" + methodName + "方法缺少参数");return R.error().message("解析方法参数为空，检查jar包" + methodName + "方法缺少参数");}// 执行方法，解析数据Map<String, Object> result = (Map<String, Object>) method.invoke(clazz, deviceType, data);log.info("解析完成，接收到的返回数据：" + result);/*** 解析jar包中所有的类** @param jarPath jar 路径* @return* @throws Exception*/public static Class<?> getClassesFromJar(String jarPath, String className) {// 获取项目所在路径String newPath = System.getProperty("user.dir");// 输入流InputStream newInput = null;// 输出流OutputStream newOutput = null;// 存储加载的类Class<?> myclass = null;// 加载jar包JarFile jarFile = null;// 类加载器URLClassLoader myClassLoader = null;try {// 创建文件存储路径String fileName = jarPath.substring(jarPath.lastIndexOf("/") + 1);newPath = newPath + "\\dataAnalFile\\" + fileName;File newFile = new File(newPath);// 不存在则创建路径if (!newFile.getParentFile().exists()) {newFile.getParentFile().mkdirs();}// 判断文件是否存在，如果不存在根据地址下载直接获取。否则直接通过路径获取if (!newFile.exists()) {// 根据文件地址下载文件到新路径URL downUrl = new URL(jarPath);// 打开连接HttpURLConnection connection = (HttpURLConnection) downUrl.openConnection();int code = connection.getResponseCode();if (code == 200) {newInput = connection.getInputStream();newOutput = new FileOutputStream(newFile);byte[] bytes = new byte[2048];int bytesRead;// 写入数据while ((bytesRead = newInput.read(bytes)) != -1) {newOutput.write(bytes, 0, bytesRead);}}}// 获取从新的文件存储地址文件File file = new File(newPath);URL url = file.toURI().toURL();// 创建类加载器myClassLoader = new URLClassLoader(new URL[]{url}, Thread.currentThread().getContextClassLoader());// 加载jar包文件jarFile = new JarFile(file);// 遍历jar包中的所有文件Enumeration<JarEntry> es = jarFile.entries();while (es.hasMoreElements()) {JarEntry e = es.nextElement();String name = e.getName();if (name.endsWith(".class")) {// 获取类名if (name.substring(name.lastIndexOf("/"), name.length()).contains(className)) {// 获取指定类名String nameStr = name.substring(0, name.length() - 6).replace('/', '.');myclass = myClassLoader.loadClass(nameStr);jarFile.close();myClassLoader.close();return myclass;}}}} catch (Exception e) {throw new RuntimeException(e);} finally {try {if (newInput != null) {newInput.close();}if (newOutput != null) {newOutput.close();}if (jarFile != null) {jarFile.close();}if (myClassLoader != null) {myClassLoader.close();}} catch (IOException e) {e.printStackTrace();}}return myclass;}方式二：通过路径下载到本地，并解析jar包
/*** 解析jar包中所有的类* @param jarPath jar 路径* @return* @throws Exception*/public static Class<?> getClassesFromJar(String jarPath,String className) throws Exception {// 获取文件File file = new File(jarPath);URL url = file.toURI().toURL();URLClassLoader myClassLoader = new URLClassLoader(new URL[]{url}, Thread.currentThread().getContextClassLoader());JarFile jarFile = new JarFile(file);Enumeration<JarEntry> es = jarFile.entries();Class<?> myclass=null;while (es.hasMoreElements()) {JarEntry e = es.nextElement();String name = e.getName();if (name.endsWith(".class")) {if (name.substring(name.lastIndexOf("/"),name.length()).contains(className)){// 获取指定类名String nameStr = name.substring(0, name.length() - 6).replace('/', '.');myclass = myClassLoader.loadClass(nameStr);jarFile.close();return myclass;}}}jarFile.close();return myclass;}