英文:
SpringBoot: Serving JSON requests with some fields missing
问题
我正在构建一个POJO类，以匹配在基于SpringBoot实现的REST API中收到的一些请求。其中一些数据**必须**由客户端提供给我，否则我甚至不愿意处理该请求。为了确保客户端至少提供给我我**绝对**需要的内容，我使用了Lombok的`@NonNull`注解：```java@Datapublic class ProductRequestBody implements Serializable{private String name;private String category;private String description;private String abbreviation;private String labelColor;private Double cost;public ProductRequestBody(){}@JsonCreatorpublic ProductRequestBody(@NonNull @JsonProperty("name") String name,@NonNull @JsonProperty("category") String category,@JsonProperty("description") String description,@NonNull @JsonProperty("cost") Double cost){this.name = name;this.category = category;this.description = description;this.cost = cost;}}
（我完全理解将货币数量处理为Double是不推荐的；这只是一个示例。）
从控制器处理这个类就像是在/products端点上添加一个监听器一样简单：
@PostMapping(value = "/products")public Product postProduct(@RequestBody ProductRequestBody newProduct){// ...// 适当地处理请求// ...}
现在，如果我收到一个POST请求，其中一个未被标记为@NonNull的字段为null，就像下面这样，我可以毫无问题地处理它：
{"name": "Some Product Name","category": "Some Product Category","cost" : 10.0,"description": null}
然而，我的目标是能够处理那些根本不关心某些字段的JSON请求。也就是说，我希能够处理以下情况，但目前还无法做到：
{"name": "Some Product Name","category": "Some Product Category","cost" : 10.0,// 这个载荷中没有"description"字段}
我该如何实现这一点？代码越少越好，一如既往。
<details><summary>英文:</summary>I'm building a POJO class to match some requests coming my way in a REST API implemented on SpringBoot. Some of the data _has_ to be given to me, otherwise I am not willing to even serve the request. To make sure the client gives me at least what I _absolutely_ need, I have used Lombok's `@NonNull`:```java@Datapublic class ProductRequestBody implements Serializable{private String name;private String category;private String description;private String abbreviation;private String labelColor;private Double cost;public ProductRequestBody(){}@JsonCreatorpublic ProductRequestBody(@NonNull @JsonProperty("name") String name,@NonNull @JsonProperty("category") String category,@JsonProperty("description") String description,@NonNull @JsonProperty("cost") Double cost){this.name = name;this.category = category;this.description = description;this.cost = cost;}}
(I completely understand that handling monetary quantities as Doubles is a no-no; this is just an example.
Processing this from my controller is as easy as a listener on the /products endpoint like so:
@PostMapping(value = "/products")public Product postProduct(@RequestBody ProductRequestBody newProduct){// ...// Serve the request appropriately// ...}
Now, if I receive a POST request with a null field that has not been marked as @NonNull, like the following, I can serve it without issue:
{"name": "Some Product Name","category": "Some Product Category","cost" : 10.0,"description": null}
My goal, however, is to be able to handle JSON requests that simply don't even have the fields they don't care about. That is, I want to be able to serve the following as well, and I currently can't:
{"name": "Some Product Name","category": "Some Product Category","cost" : 10.0,// No "description" field in this payload}
How could I go about doing this? The less code, the better, as always.
答案1
得分: 2
如果您使用spring-boot和lombok，您可以将您的类简化为以下形式：@Datapublic class ProductRequestBody implements Serializable {@NonNullprivate String name;@NonNullprivate String category;@NonNullprivate Double cost;private String description;private String abbreviation;private String labelColor;}如果没有提供name、category或cost，则会返回400，否则返回200。
英文:
If you use spring-boot and lombok you can simplify your class to be like this:
@Datapublic class ProductRequestBody implements Serializable {@NonNullprivate String name;@NonNullprivate String category;@NonNullprivate Double cost;private String description;private String abbreviation;private String labelColor;}
it will return 400 if name, category or cost will be not provided and 200 otherwise.
答案2
得分: 1
Spring可以处理JSON的序列化和反序列化而不会出现任何问题。
你应该让Spring来处理它。
你可以尝试以下内容。
@Datapublic class ProductRequestBody implements Serializable {@NonNullprivate String name;@NonNullprivate String category;private String description;private String abbreviation;private String labelColor;@NonNullprivate Double cost;}
如果你真的想要遵循创建构造函数的模式，那么你应该创建一个只包含@NonNull字段的构造函数，并为其他字段创建getter（lombok会为你处理）。如果你想要添加@JsonProperty，那么你需要创建一个单独的getter方法。
@Datapublic class ProductRequestBody implements Serializable{private String name;private String category;private String description;private String abbreviation;private String labelColor;private Double cost;public ProductRequestBody(){}@JsonCreatorpublic ProductRequestBody(@NonNull @JsonProperty("name") String name,@NonNull @JsonProperty("category") String category,@NonNull @JsonProperty("cost") Double cost){this.name = name;this.category = category;this.cost = cost;}@JsonProperty("description")public String getDescription() {return description;}}
英文:
Spring handles serializing and deserializing json without any issue.
You should let spring handle it.
You can try the following.
@Datapublic class ProductRequestBody implements Serializable {@NonNullprivate String name;@NonNullprivate String category;private String description;private String abbreviation;private String labelColor;@NonNullprivate Double cost;}
If you really want to follow the pattern of creating a constructor, then you should create a constructor with only the @NonNull fields and create getter of others (lombok handles that for you). If you want to add @JsonProperty then you need to create separate getter.
@Datapublic class ProductRequestBody implements Serializable{private String name;private String category;private String description;private String abbreviation;private String labelColor;private Double cost;public ProductRequestBody(){}@JsonCreatorpublic ProductRequestBody(@NonNull @JsonProperty("name") String name,@NonNull @JsonProperty("category") String category,@NonNull @JsonProperty("cost") Double cost){this.name = name;this.category = category;this.cost = cost;}@JsonProperty("description")public String getDescription() {return description;}}
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