Spring @RestController自定义JSON反序列化器

问题描述

我想为某些类使用自定义JSON反序列化器（角色），但我无法使其正常工作。自定义反序列化器不会被调用。

I want to use custom JSON deserializer for some classes(Role here) but I can't get it working. The custom deserializer just isn't called.

我使用Spring Boot 1.2。

I use Spring Boot 1.2.

反序列化器：

public class ModelDeserializer extends JsonDeserializer<Role> {

    @Override
    public Role deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
        return null; // this is what should be called but it isn't
    }
}

控制器：

@RestController
public class RoleController {

    @RequestMapping(value = "/role", method = RequestMethod.POST)
    public Object createRole(Role role) {
        // ... this is called
    }
}

1. @JsonDeserialize on Role

@JsonDeserialize(using = ModelDeserializer.class)
public class Role extends Model {

}

Jackson2ObjectMapperBuilder Java Config中的bean

Jackson2ObjectMapperBuilder bean in Java Config

@Bean
public Jackson2ObjectMapperBuilder jacksonBuilder() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.deserializerByType(Role.class, new ModelDeserializer());
    return builder;
}

我在做什么错误？

编辑这可能是由 @RestController 引起的，因为它适用于 @Controller ...

EDIT It is probably caused by @RestController because it works with @Controller...

推荐答案

首先你不需要覆盖 Jackson2ObjectMapperBuilder 以添加自定义反序列化器。当您无法添加 @JsonDeserialize 注释时，应使用此方法。你应该使用 @JsonDeserialize 或覆盖 Jackson2ObjectMapperBuilder 。

First of all you don't need to override Jackson2ObjectMapperBuilder to add custom deserializer. This approach should be used when you can't add @JsonDeserialize annotation. You should use @JsonDeserialize or override Jackson2ObjectMapperBuilder.

遗漏的是 @RequestBody 注释：

@RestController
public class JacksonCustomDesRestEndpoint {

    @RequestMapping(value = "/role", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseBody
    public Object createRole(@RequestBody Role role) {
        return role;
    }
}

@JsonDeserialize(using = RoleDeserializer.class)
public class Role {
    // ......
}

public class RoleDeserializer extends JsonDeserializer<Role> {
    @Override
    public Role deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
        // .................
        return something;
    }
}

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