根据 RequestBody 参数获取 Java Spring boot 中的特定 bean [英] Get a specific bean in Java Spring boot based on RequestBody parameter

问题描述

在我的 Spring Boot 应用程序中，我想根据接收到的 @RequestBody 值获取特定类的对象/bean.有没有办法做同样的事情

In my spring boot application, I want to get an object/bean of a specific class based on the @RequestBody value that is received. Is there a way to do the same

界面

public interface Vehicle{
  public String drive();
}

接口的实现

@Component
public class Car implements Vehicle {
  public String drive(){
    return "Driving a car";
  }
}

@Component
public class Bike implements Vehicle {
    return "Riding a Bike";
}

现在在基于请求正文的控制器中，我想获取 CAR 或 Bike 的 bean.

Now in my controller based on the request body I want to get the bean of Either CAR or Bike.

有没有办法做到这一点

控制器

@RestController
@RestMapping('type-of-vehicle')
public class VehicleSelectController{
   @PostMapping
   public String identify_Vehicle_Selected(@RequestBody vehicletype vehicletype_data){

     /* ## Code to get the bean of vehicle type sent in the RequestBody */
    // example vehicletype_data selected vehicle is car
    // we get the bean of the 'CAR' class
    // Returns the correct implementation of the type of vehicle selected by user
     return vehicle.drive();

   }
}

是否有任何注释可用于实现相同的更多功能，我试图避免创建一个根据收到的车辆类型返回正确对象的配置类

Are there any annotations that can be used to achieve the same more of I am trying to avoid making a config class that returns the correct object based on the vehicle type received

我一直在思考这个问题

错误的实现方式

@RestController
@RestMapping('type-of-vehicle')
public class VehicleSelectController{
   @PostMapping
   public String identify_Vehicle_Selected(@RequestBody vehicletype vehicletype_data){

     @Autowired
     @Qualifiyer('${vehicletype_data}')
     Vehicle vehicle_object
     return vehicle_object.drive();

   }
}

有没有办法做类似不正确的实现

Is there a method to do something similar to the incorrect implementation

推荐答案

我发现了类似的问题:通过限定符从 ApplicationContext 中获取 bean

如果它不能解决您的问题，请尝试以下操作:

If it does not solve your problem, maybe try something like:

1. 向Vehicle接口添加方法，通过请求的给定数据检查它是否是目标车辆:

1. Add method to Vehicle interface that check whether it is target vehicle by given data from request:

boolean isTargetVehicle(final string valueFromRequest);

汽车车辆实施示例:

public boolean isTargetVehicle(final string valueFromRequest) {
    return "car".equals(valueFromRequest);
}

1. 然后在您的控制器/服务中使用车辆注入集合:

@Autowired
Collection<Vehicle> vehicles;

1. 在控制器中添加仅在目标车辆上调用 drive 方法的实现.它从 drive 方法返回值，否则如果找不到车辆支持则抛出异常:

1. Add implementation in controller that invokes drive method only on target vehicles. It returns value from drive method, otherwise throws exception if vehicle support is not found:

vehicles.stream().filter(v -> v.isTargetVehivle(dataFromRequest)).map(Vehicle::drive).findFirst().orElseThrow(() -> new Exception("vehicle not supported"));

通过这种方法，您无需修改​​现有代码即可轻松添加新车辆.另外最好使用构造函数注入.

In this approach you can easily add new vehicle without modifying existing code. And in addition it is better to use constructor injection.

这篇关于根据 RequestBody 参数获取 Java Spring boot 中的特定 bean的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！