Reactive programming 无法反序列化<；的实例；对象>；启动外\u阵列令牌-webClient

我正在编写一个简单的

get

方法，使用webclient获取属性信息。但是，我得到了下面的错误响应消息：

{
    "timestamp": "2019-02-25T06:57:03.487+0000",
    "path": "/modernmsg/getentity",
    "status": 500,
    "error": "Internal Server Error",
    "message": "JSON decoding error: Cannot deserialize instance of `com.reputation.api.modernmsg.model.Entity` out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.reputation.api.modernmsg.model.Entity` out of START_ARRAY token\n at [Source: UNKNOWN; line: -1, column: -1]"
}

实际json响应为：

[
    {
        "name": "Point Breeze",
        "street": "488 Lemont Dr",
        "city": "Nashville",
        "state": "TN",
        "postal_code": "37216",
        "slug": "point-breeze"
    }
]

以下是我的控制器类中获取属性的方法：

@RequestMapping(method = RequestMethod.GET, value = "/getentity")
    public Mono<Entity> getEntity(@RequestParam("token") String token, @RequestParam("name") String name) {
        return service.fetchEntity(token, name);
    }

---

如果您需要更多信息，请告诉我。

这更像是一个JSON反序列化问题。查看您的实体类，您正在设置期望JSON响应的内容，如：

{
"modernMsgEntity": [
    {
        "name": "Point Breeze",
        "street": "488 Lemont Dr",
        "city": "Nashville",
        "state": "TN",
        "postal_code": "37216",
        "slug": "point-breeze"
    }
  ]
}

如果希望Jackson直接反序列化对象数组，则必须告诉它：

Flux<ModernMsgEntity> messages = webClient.get().uri(url).retrieve().bodyToFlux(ModernMsgEntity.class);

Flux messages=webClient.get（）.uri（url.retrieve（）.bodyToFlux（ModernMsgEntity.class）；

我尝试了

返回webClient.get（）.uri（url.retrieve（）.bodyToFlux（ModernMsgEntity[].class）

但它仍然抛出相同的错误

JSON解码错误：无法从START\u对象令牌中反序列化ModernMsgEntity[]的实例；嵌套异常为com.fasterxml.jackson.databind.exc.MismatchedInputException:无法在[Source:UNKNOWN；line:-1，column:-1]处反序列化ModernMsgEntity[]的实例的起始\u对象标记\n这不是同一个错误，您的问题提到了
起始\u数组标记的错误，这与您显示的JSON主体一致。你确定你得到了正确的回答吗？是的，回答是正确的。它是一个对象数组。您可以尝试通过直接使用响应体作为字符串将WebFlux从等式中删除，并使用
readValue
方法将其与ObjectMapper实例反序列化。我尝试通过返回
Mono
而不是
Flux
，这很有效。
package com.reputation.api.modernmsg.model;

public class ModernMsgEntity {
    private String name;
    private String street;
    private String city;
    private String state;
    private String postal_code;
    private String slug;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getStreet() {
        return street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }

    public String getPostal_code() {
        return postal_code;
    }

    public void setPostal_code(String postal_code) {
        this.postal_code = postal_code;
    }

    public String getSlug() {
        return slug;
    }

    public void setSlug(String slug) {
        this.slug = slug;
    }
}

{
"modernMsgEntity": [
    {
        "name": "Point Breeze",
        "street": "488 Lemont Dr",
        "city": "Nashville",
        "state": "TN",
        "postal_code": "37216",
        "slug": "point-breeze"
    }
  ]
}

Flux<ModernMsgEntity> messages = webClient.get().uri(url).retrieve().bodyToFlux(ModernMsgEntity.class);