Spring @RequestBody 和 Enum 值 [英] Spring @RequestBody and Enum value

问题描述

我有这个枚举

public enum Reos {

    VALUE1("A"),VALUE2("B"); 

    private String text;

    Reos(String text){this.text = text;}

    public String getText(){return this.text;}

    public static Reos fromText(String text){
        for(Reos r : Reos.values()){
            if(r.getText().equals(text)){
                return r;
            }
        }
        throw new IllegalArgumentException();
    }
}

还有一个叫做 Review 的类，这个类包含一个 enum Reos 类型的属性.

And a class called Review, this class contains a property of the type enum Reos.

public class Review implements Serializable{

    private Integer id;
    private Reos reos;

    public Integer getId() {return id;}

    public void setId(Integer id) {this.id = id;}

    public Reos getReos() {return reos;}

    public void setReos(Reos reos) {
        this.reos = reos;
    }
}

最后我有一个控制器，它通过 @RequestBody 接收对象审查.

Finally I have a controller that receives an object review with the @RequestBody.

@RestController
public class ReviewController {

    @RequestMapping(method = RequestMethod.POST, value = "/reviews")
    @ResponseStatus(HttpStatus.CREATED)
    public void saveReview(@RequestBody Review review) {
        reviewRepository.save(review);
    }
}

如果我用

{"reos":"VALUE1"}

没有问题，但是当我用

{"reos":"A"}

我收到此错误

Could not read document: Can not construct instance of com.microservices.Reos from String value 'A': value not one of declared Enum instance names: [VALUE1, VALUE2] at [Source: java.io.PushbackInputStream@23ce847a; line: 1, column: 40] (through reference chain: com.microservices.Review["reos"]); nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not construct instance of com.microservices.Reos from String value 'A': value not one of declared Enum instance names: [VALUE1, VALUE2] at [Source: java.io.PushbackInputStream@23ce847a; line: 1, column: 40] (through reference chain: com.microservices.Review["reos"])"

我明白这个问题，但我想知道一种方法来告诉 Spring 对于每个带有 Reos 枚举的对象，使用 Reos.fromText() 而不是 Reos.valueof().

I undertand the problem, but I wanted to know a way to tell Spring that for every object with Reos enum use Reos.fromText() instead of Reos.valueof().

这可能吗?

推荐答案

我找到了我需要的东西.http://chrisjordan.ca/post/50865405944/custom-json-serialization-for-enums-using-jackson.

I've found what I need. http://chrisjordan.ca/post/50865405944/custom-json-serialization-for-enums-using-jackson.

这是两个步骤.

1. 重写 Reos 枚举的 toString 方法

@Override
public String toString() {
    return text;
}

1. 使用@JsonCreator 注释 Reos 枚举的 fromText 方法.

@JsonCreator
public static Reos fromText(String text)

仅此而已.

我希望这可以帮助面临同样问题的其他人.

I hope this could help others facing the same problem.

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