Spring MVC绑定，无设置器

即使域模型对象没有设置器，也可以将表单参数绑定到域模型对象。只需添加带有@InitBinder方法的@ControllerAdvice类，即可通过initDirectFieldAccess（）方法将应用程序配置为进行字段绑定

package boottests.controllers;import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.*;@ControllerAdvice
class BindingControllerAdvice {@InitBindervoid initBinder(WebDataBinder binder) {binder.initDirectFieldAccess();}
}

我的域模型如下所示：

package boottests;public class Person {private final String firstname;private final String lastname;public Person(String firstname, String lastname) {this.firstname = firstname;this.lastname = lastname;}@Overridepublic String toString() {return firstname + " " + lastname;}
}

这是我的控制器：

package boottests.controllers;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;import boottests.Person;@Controller @RequestMapping("/person")
class PersonController {@GetMappingString postForm(Person person) {System.out.println("YYY " + person + " YYY");return "/";}
}

当然，我的表格在index.html上：

<form action="person" > 
Lastname: <input type="text" name="lastname"/> <br/> 
Firstname: <input type="text" name="firstname"/> <br/> 
<input type="submit" value="Submit"/> 
</form>

如果在Spring Boot上运行此命令，则会看到表单参数已正确绑定到域模型的字段。