我在为body对象生成示例时也遇到了类似的问题--在swagger 1.5.x中，注解@Example和@ExampleProperty毫无理由地不起作用。（我使用1.5.16）
我目前的解决方案是：
对非实体对象使用@ApiParam(example="...")，例如：

public void post(@PathParam("userId") @ApiParam(value = "userId", example = "4100003") Integer userId) {}

对于body对象，创建新的类并使用@ApiModelProperty(value = " ", example = " ")注解字段，例如：

@ApiModel(subTypes = {BalanceUpdate.class, UserMessage.class})
class PushRequest {
    @ApiModelProperty(value = "status", example = "push")
    private final String status;;
}

实际上，@ApiParam注解的example属性的java文档声明，这是专门用于非主体参数的。其中examples属性可用于主体参数。
我测试了这个注解

@ApiParam(
  value = "A JSON value representing a transaction. An example of the expected schema can be found down here. The fields marked with an * means that they are required.",
  examples = @Example(value = 
    @ExampleProperty(
      mediaType = MediaType.APPLICATION_JSON,
      value = "{foo: whatever, bar: whatever2}"
    )
  )
)

这导致对于相应的方法生成以下swagger：

/transaction:
  post:
  ...
    parameters:
    ...
    - in: "body"
      name: "body"
      description: "A JSON value representing a transaction. An example of the expected\
        \ schema can be found down here. The fields marked with an * means that\
        \ they are required."
      required: false
      schema:
        type: "string"  
      x-examples:
        application/json: "{foo: whatever, bar: whatever2}"

然而，swagger-ui似乎没有采用这个值。我尝试了2.2.10版和最新的3.17.4版，但两个版本都没有使用swagger的x-examples属性。
在code of swagger-ui中有一些x-example的引用（用于非主体参数），但没有x-examples的匹配。也就是说，目前swagger-ui似乎不支持这一点。
如果你真的需要这个例子的值，目前最好的选择似乎是改变方法的签名，并为body参数使用一个专用的域类型。正如在评论中已经提到的，swagger将自动拾取域类型的结构，并在swagger-ui中打印一些不错的信息：

你试过以下方法吗？

@ApiModelProperty(
    value = "A JSON value representing a transaction. An example of the expected schema can be found down here. The fields marked with an * means that they are required.",
    example = "{foo: whatever, bar: whatever2}")

祝你愉快

使用swagger 3.0.0在rest方法上尝试此方法

@Operation(
        summary = "Finds a person",
        description = "Finds a person by their Id.",
        tags = { "People" },
        responses = {
            @ApiResponse(
                description = "Success",
                responseCode = "200",
                content = @Content(mediaType = "application/json", schema = @Schema(implementation = Person.class))
            ),
            @ApiResponse(description = "Not found", responseCode = "404", content = @Content),
            @ApiResponse(description = "Internal error", responseCode = "500", content = @Content)
        }
    )

Swagger.v3Kotlin/Kotlin示例：

@Post("/get-list")
fun getList(
        @RequestBody(description = "Get list of ...",
                content = [Content(
                        mediaType = "application/json",
                        schema = Schema(implementation = RequestDTO::class),
                        examples = [ExampleObject(value = """
                            {
                                "pagination": {
                                    "page": 0,
                                    "perPage": 10
                                },
                                "filter": {
                                    "property_1": "string",
                                    "property_2": "string"
                                },
                                "sort": {
                                    "field": "property_1",
                                    "order": "DESC"
                                }
                            }
                        """)]
                )]) @Body request: RequestDTO): Response<SomeDTO> { ... }

如果你使用的是swagger 2.9.2，那么Examples就不能在那里工作。这些注解将被忽略

protected Map<String, Response> mapResponseMessages(Set<ResponseMessage> from) {
  Map<String, Response> responses = newTreeMap();
  for (ResponseMessage responseMessage : from) {
    Property responseProperty;
    ModelReference modelRef = responseMessage.getResponseModel();
    responseProperty = modelRefToProperty(modelRef);
    Response response = new Response()
        .description(responseMessage.getMessage())
        .schema(responseProperty);
    **response.setExamples(Maps.<String, Object>newHashMap());**
    response.setHeaders(transformEntries(responseMessage.getHeaders(), toPropertyEntry()));
    Map<String, Object> extensions = new VendorExtensionsMapper()
        .mapExtensions(responseMessage.getVendorExtensions());
    response.getVendorExtensions().putAll(extensions);
    responses.put(String.valueOf(responseMessage.getCode()), response);
  }
  return responses;
}

尝试使用swagger 3.0.0-快照。您需要像这样更改maven依赖项：

<dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>3.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>3.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-spring-webmvc</artifactId>
            <version>3.0.0-SNAPSHOT</version>
        </dependency>

并将Swagger配置文件上的注解更改为：@EnableSwagger2WebMvc

我使用的是swagger.version 1.5.22，springfox-swagger 2 2.9.2和springfox-swagger-ui 2.9.2。对我来说，@schema可以代替@ApiModelProperty。假设请求体使用abcd来类。

public class ABCDto {
    @Schema(name = "id", example = "1", required = true)
    @JsonProperty("id")
    private String id;
}