[update]-产品服务更新

src/main/java/com/example/demo/controller/ProductController.java

@@ -0,0 +1,16 @@
+package com.example.demo.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/product")
+public class ProductController {
+
+    @GetMapping("/greet")
+    public String greet(@RequestParam(name = "name", defaultValue = "World") String name) {
+        return "Hello, " + name + "!";
+    }
+}