Spring中@RestController和@Controller的使用及区别

@Target(value=TYPE)
@Retention(value=RUNTIME)
@Documented
@Controller
@ResponseBody
public @interface RestController {
}

import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/api/users")
public class UserController {

    // GET 请求，获取用户信息
    @GetMapping("/{id}")
    public String getUserById(@PathVariable("id") Long id) {
        return "User ID: " + id;
    }

    // POST 请求，创建新用户
    @PostMapping
    public String createUser(@RequestBody String user) {
        return "User created: " + user;
    }
}

@RestController
@RequestMapping("/api")
public class ApiController {
    @GetMapping("/greeting")
    public String greeting() {
        return "Hello, World!";
    }
}

@Controller
@RequestMapping("/web")
public class WebController {
    @GetMapping("/greeting")
    public String greeting() {
        return "greeting"; // 返回视图名称
    }
}

@RestController
@RequestMapping("/api")
public class MyController {
    @GetMapping("/hello")
    public String sayHello() {
        return "Hello, API!";
    }
}

@RestController
@RequestMapping("/users")
public class UserController {

    // GET 请求
    @GetMapping("/{id}")
    public String getUser(@PathVariable Long id) {
        return "User ID: " + id;
    }

    // POST 请求
    @PostMapping
    public String createUser(@RequestBody String user) {
        return "Created User: " + user;
    }
}

@RestController
@RequestMapping("/books")
public class BookController {

    @PostMapping
    public String createBook(@RequestBody Book book) {
        return "Created Book: " + book.getTitle();
    }
}
class Book {
    private String title;
    private String author;
    // Getter and Setter
}

{
    "title": "Spring in Action",
    "author": "Craig Walls"
}

@RestController
@RequestMapping("/products")
public class ProductController {

    @GetMapping("/{id}")
    public String getProduct(@PathVariable Long id, @RequestParam String name) {
        return "Product ID: " + id + ", Name: " + name;
    }
}

@RestController
@RequestMapping("/users")
public class UserController {

    @GetMapping("/{id}")
    public User getUser(@PathVariable Long id) {
        return new User(id, "John");
    }
}
class User {
    private Long id;
    private String name;
    // Constructor, Getter, Setter
}

{
    "id": 1,
    "name": "John"
}