java动态调用jar包方法

package cn.springBoot.controller;


import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;



import cn.springBoot.entity.User;
import cn.springBoot.service.UserService;
import cn.springBoot.util.FileUploadUtil;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.List;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.ui.Model;

/**
 * <p>
 *  前端控制器
 * </p>
 *
 * @author ljx
 * @since 2020-01-16
 */
@RestController
@RequestMapping("/user")
@Api(value="用户controller",tags={"用户操作接口"})
public class UserController {

    public static void main(String[] args) {
        // 系统类库路径
        File libPath = new File("D:/jar");

        // 获取所有的.jar和.zip文件
        File[] jarFiles = libPath.listFiles(new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return name.endsWith(".jar") || name.endsWith(".zip");
            }
        });

        if (jarFiles != null) {
            // 从URLClassLoader类中获取类所在文件夹的方法
            // 对于jar文件，可以理解为一个存放class文件的文件夹
            Method method = null;
            try {
                method = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
            } catch (NoSuchMethodException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            } catch (SecurityException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            boolean accessible = method.isAccessible();     // 获取方法的访问权限
            try {
                if (accessible == false) {
                    method.setAccessible(true);     // 设置方法的访问权限
                }
                // 获取系统类加载器
                URLClassLoader classLoader = (URLClassLoader) Thread.currentThread().getContextClassLoader();;
                for (File file : jarFiles) {
                    try {
                        URL url = file.toURI().toURL();
                        method.invoke(classLoader, url);
                        Class c = Class.forName("cn.springBoot.util.FileUploadUtil");
                        Method m = c.getMethod("getVersion",String.class);
                        Object s = m.invoke(c,"sss");
                        System.out.println("读取jar文件成功"+file.getName() + s.toString());
                    } catch (Exception e) {
                        System.out.println("读取jar文件失败");
                    }
                }
            } finally {
                method.setAccessible(accessible);
            }
        }
    }

    static class MyClassLoader extends URLClassLoader {

        public MyClassLoader(URL[] urls) {
            super(urls);
        }

        public MyClassLoader(URL[] urls, ClassLoader parent) {
            super(urls, parent);
        }

        public void addJar(URL url) {
            this.addURL(url);
        }

    }
//
//  private final static Logger logger = LoggerFactory.getLogger(SchoolController.class);
//
// @Autowired
// private UserService userService;
//
//
// @GetMapping("/getAll")
// @ApiOperation(value="获取全部user接口",response=User.class,responseContainer="list")
// public List<User> findAll() {
//
//    logger.info("getAll");
//
//    return userService.selectList(null);
//
// }
// @GetMapping("/getById")
// @ApiOperation(value="根据id获取user",response=User.class)
// public User getById(@RequestParam int id) {
//
//    logger.info("getAll");
//
//    return  userService.selectByIda(id);
//
// }
//
// @GetMapping("/update")
// @ApiOperation(value="修改user",response=User.class)
// public User update(User user) {
//
//    logger.info("update");
//
//    return  userService.updateUser(user);
//
// }
//
//
// @GetMapping("/del")
// @ApiOperation(value="删除")
//    public String deleteEmp(Integer id){
//    logger.info("del");
//
//    return  userService.delUser(id);
//    }
//
//
// @PostMapping(value = "/fileUpload")
// @ApiOperation(value="图片上传")
// public String fileUpload(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request) {
//
//
//         return FileUploadUtil.fileUpLoad(file);
//     }
//

}