content: // Copyright (c) 2025 Alibaba Group and its affiliates
  
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  
  //     http://www.apache.org/licenses/LICENSE-2.0
  
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  package com.example.controller;
  
  import com.example.service.MessageService;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.RequestParam;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  @Controller
  @ResponseBody
  public class MessageController {
  
      private final MessageService messageService;
  
      @Autowired
      public MessageController(MessageService messageService) {
          this.messageService = messageService;
      }
  
      @GetMapping(value = "/welcome")
      public String getWelcomeMessage(@RequestParam(value = "name", defaultValue = "World") String name) {
          return messageService.getWelcomeMessage(name);
      }
  }
  