在java中由类名和方法名字符串实现其调用方式

import java.lang.reflect.Method;
 
public class Test {
 public static void main(String[] args) throws Exception {
 String className = "com.runqianapp.ngr.alias.example.FunClass";
 String methodName = "sayHello";
 Class clz = Class.forName(className);
 // 
 Object obj = clz.newInstance();
 //获取方法 
 Method m = obj.getClass().getDeclaredMethod(methodName, String.class);
 //调用方法 
 String result = (String) m.invoke(obj, "aaaaa");
 System.out.println(result);
 }
}
 
class FunClass{
 public String sayHello(String s){
 System.out.println(s);
 return "hello!";
 }
}

@Component
public class SpringUtil implements ApplicationContextAware {
 
 @Autowired
 private static ApplicationContext applicationContext;
 
 @Override
 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
  if (SpringUtil.applicationContext == null) {
   SpringUtil.applicationContext = applicationContext;
  }
  System.out.println("========ApplicationContext配置成功,在普通类可以通过调用SpringUtil.getAppContext()获取applicationContext对象,applicationContext=" + SpringUtil.applicationContext + "========");
 }
 
 //获取applicationContext
 public static ApplicationContext getApplicationContext() {
  return applicationContext;
 }
 
 //通过name获取 Bean.
 public static Object getBean(String name) {
  return getApplicationContext().getBean(name);
 }
 
 //通过class获取Bean.
 public static <T> T getBean(Class<T> clazz) {
  return getApplicationContext().getBean(clazz);
 }
 
 //通过name,以及Clazz返回指定的Bean
 public static <T> T getBean(String name, Class<T> clazz) {
  return getApplicationContext().getBean(name, clazz);
 }
}

public abstract class RootService { 
 private Logger logger = LoggerFactory.getLogger(RootService.class); 
 private long beforeTime; 
 private long endTime; 
 
 private void before (String action) {
  beforeTime = System.currentTimeMillis();
  logger.info("交易：" + action + "开始时间：" + beforeTime);
 }
 
 private void end (String action) {
  endTime = System.currentTimeMillis();
  long time = endTime - beforeTime;
  logger.info("交易：" + action + "结束时间：" + endTime);
  logger.info("交易：" + action + "耗时：" + time);
 }
 
 public JSONObject execute(String actionName,Map map) {
  before(actionName);
  JSONObject jsonObject = doNext(map);
  end(actionName);
  return jsonObject;
 }
 
 private JSONObject doNext(Map map) {
  try {
   return doAction(map);
  } catch (Exception e) {
   e.printStackTrace();
   JSONObject js = new JSONObject();
   js.put("retCode","000000");
   js.put("retMsg","程序报错");
   return js;
  }
 } 
 protected abstract JSONObject doAction(Map map); 
}

@Controller
@RequestMapping("/root")
public class RootController {
 
 @ResponseBody
 @RequestMapping(value = "/h5.do",produces = {"application/json;charset=UTF-8"},method = RequestMethod.POST)
 public JSONObject root(@RequestBody Map<String,Object> map, HttpServletRequest httpServletRequest){
  String service = (String) map.get("service");
 
  JSONObject js = new JSONObject();
  RootService rootService = (RootService) SpringUtil.getBean(service);
 
  return rootService.execute(service,map);
 } 
}

@Service
public class UserServiceImpl extends RootService{
 private Logger logger = LoggerFactory.getLogger(UserService.class);
 
 @Autowired
 private UserDao userDao;
 
 @Override
 protected JSONObject doAction(Map map) {
  JSONObject js = new JSONObject();
  String id = (String) map.get("id");
  User user = userDao.getUser(id);
  js.put("user",user);
  logger.info("进入了UserService");
  return js;
 }
}

{
 "id":"1",
 "service":"userServiceImpl"
}

{
 "user": {
 "user_id": "1",
 "password": "123456",
 "user_name": "张三"
 }
}