如何在Spring MVC中将字符串转换为对象

public class User {
    private int id;
    private String name;
    private int age;

    // 省略构造方法、getter和setter
}

@Controller
public class UserController {
    @RequestMapping("/saveUser")
    public String saveUser(@ModelAttribute("user") User user) {
        // 处理转换后的User对象
        // ...
        return "success";
    }
}

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/mvc
                           http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven/>

    <!-- 其他配置 -->
</beans>

<form action="/saveUser" method="post">
    <input type="text" name="id"/>
    <input type="text" name="name"/>
    <input type="text" name="age"/>
    <input type="submit" value="Save"/>
</form>