ApplicationController.java - Spring Boot + ReactJS hello world example

ApplicationController.java

package com.javaxp;

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ApplicationController {

    @CrossOrigin(origins = {"http://localhost:3000"})
    @GetMapping("/sayhello")
    public String sayHello(@RequestParam(value = "name", defaultValue = "world") String name) {
        return "Hello "+name;
    }


}