java - 如何在 Spring 中将 RequestHeader 转换为自定义对象

Question

我的 Controller 中有方法:

@RequestMapping(method = RequestMethod.POST)
public CustomObject createCustomObject(final @RequestHeader("userId") Long userId) {
   ...
}

我可以编写一些自定义转换器或类似的东西来将此 RequestHeader userId 参数转换为 User 对象，这样我的方法将是:

@RequestMapping(method = RequestMethod.POST)
public CustomObject createCustomObject(final User user) {
   ...
}

可以用spring-mvc做吗？

Answer 1

基本上我是根据评论的建议实现的。下面是一个例子:

import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;

@RestController
public class SimpleController {

    @GetMapping("/user")
    public String greeting(@RequestHeader(name = "userId") User user) {
        return "Hey, " + user.toString();
    }
}

public class User {
    private String id;
    private String firstName;
    private String lastName;
    ...
}

然后我们将创建一个转换器:

import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;

@Component
public class UserFromHeaderConverter implements Converter<String, User> {

    @Override
    public User convert(final String userId) {
        // fetch user from the database etc.
        
        final User user = new User();
        user.setId(userId);
        user.setFirstName("First");
        user.setLastName("Last");

        return user;
    }
}

要测试它，请执行:curl --header "userId: 123"localhost:8080/user

结果将是:嘿，用户{id='123', firstName='First', lastName='Last'}

版本:

• spring-boot:2.0.3
• spring-web:5.0.7