Spring \ Spring Boot：是否需要自定义验证器？

问题描述

假设我具有此控制器映射功能：

@GetMapping("/result")
public Stats result(@RequestParam Integer homeId,@RequestParam Integer awayId)
        throws MissingTeamException,InvalidTeamIdExcpetion {

    //Validation starts here
    int numOfAvailableTeams = teamResource.retrieveAllTeams().size();
    
    if( homeId < 0 || homeId >= numOfAvailableTeams)
            throw new InvalidTeamIdExcpetion(homeId);

    if(awayId < 0 || awayId >= numOfAvailableTeams)
            throw new InvalidTeamIdExcpetion(awayId);
    //end of validation

    return generateResult(homeId,awayId);
}

您可以看到我正在验证住家和出家证。

除了创建自定义验证器类之外，我还能以更简洁的方式做到这一点吗？

谢谢！

解决方法

通常，在每种情况下，逻辑都应该在服务类（由@Service标记）中编写，而不是在控制器中编写。因此，您可以使用方法validating()创建带有验证所需参数的服务类。服务示例：

@Service
public class YourService {

    //This variable and constructor are optional because I didn't see your whole code.
    //But if you will to create TeamResource field in service,Spring Boot will automatically
    //inject teamResource if you have suitable Bean.
    private TeamResource teamResource;

    public YourService(TeamResource teamResource) {
        this.teamResource = teamResource;
    }

    public TypeOfMethodGenerateResult validate(Integer homeId,Integer awayId) {

        int numOfAvailableTeams = teamResource.retrieveAllTeams().size();

        if (homeId < 0 || homeId >= numOfAvailableTeams)
            throw new InvalidTeamIdExcpetion(homeId);

        if(awayId < 0 || awayId >= numOfAvailableTeams)
            throw new InvalidTeamIdExcpetion(awayId);

        return generateResult(homeId,awayId);
    }
}

和控制器：

//Autoinject like in service.
private YourService yourService;

public YourService(YourService yourService) {
    this.yourService = yourService;
}

@GetMapping("/result")
public Stats result(@RequestParam Integer homeId,@RequestParam Integer awayId)
        throws MissingTeamException,InvalidTeamIdExcpetion {

    return yourService.validate(homeId,awayId);
}

,

要验证@RequestParam，可以使用 @Valid 和 @Validated 批注。

@GetMapping("/result")
    public String result(@RequestParam @Valid @Size(min = 1) Integer homeId,@RequestParam @Valid @Size(min = 1) Integer awayId)

在类本身上使用 @Validated 。

进口供参考：

导入org.springframework.validation.annotation.Validated;

import javax.validation.Valid;

import javax.validation.constraints.Size;