public class User {
    private String name;
    private Integer age;
    // 必須提供無參構(gòu)造器和 getter/setter 方法
    // 省略 getter/setter...
}

@Controller
public class UserController {
    // 方式1：直接作為方法參數(shù)
    @PostMapping("/register")
    public String register(User user) {
        System.out.println("用戶名: " + user.getName());
        System.out.println("年齡: " + user.getAge());
        return "success";
    }
    // 方式2：使用 @ModelAttribute 顯式綁定
    @PostMapping("/update")
    public String update(@ModelAttribute("user") User user) {
        // 對(duì)象會(huì)被自動(dòng)放入模型，可用于視圖渲染
        return "result";
    }
}

public class Address {
    private String city;
    // getter/setter...
}
public class User {
    private Address address; // 嵌套對(duì)象
}

<input name="address.city" value="北京">

public class User {
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date birthDate;
}

public class User {
    @NotBlank(message = "姓名不能為空")
    private String name;
}
@PostMapping("/save")
public String save(@Valid User user, BindingResult result) {
    if (result.hasErrors()) {
        // 處理驗(yàn)證錯(cuò)誤
    }
    return "...";
}

<form action="/register" method="post">
    <input type="text" name="name">     <!-- 綁定到 user.name -->
    <input type="number" name="age">    <!-- 綁定到 user.age -->
    <button>提交</button>
</form>

http://localhost:8080/user?name=John&age=25

@GetMapping("/user")
public String getUser(User user) { ... } // 自動(dòng)綁定參數(shù)

@PostMapping("/api/user")
public ResponseEntity<?> createUser(@RequestBody User user) {
    // 處理JSON數(shù)據(jù)
    return ResponseEntity.ok(user);
}