4

我正在使用 jersey 客户端使用 REST 服务做一个小 PoC,但我遇到了 LocalDateTime 格式的字段问题。REST 服务响应如下:

{
    "id": 12,
    "infoText": "Info 1234",
    "creationDateTime": "2001-12-12T13:40:30"
}

还有我的实体类:

package com.my.poc.jerseyclient;

import java.time.LocalDateTime;

public class Info {

    private Long id;
    private String infoText;
    private LocalDateTime creationDateTime;

    public Long getId() {
        return id;
    }

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

    public String getInfoText() {
        return infoText;
    }

    public void setInfoText(String infoText) {
        this.infoText = infoText;
    }

    public LocalDateTime getCreationDateTime() {
        return creationDateTime;
    }

    public void setCreationDateTime(LocalDateTime creationDateTime) {
        this.creationDateTime = creationDateTime;
    }

}

我的 pom.xml 中的依赖项:

<dependencies>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>2.21</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>2.6.1</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>2.6.1</version>
        </dependency>
    </dependencies>

我的代码使用 jersey 客户端执行 GET /api/info/123:

Client client = ClientBuilder.newClient(new ClientConfig().register(JacksonJsonProvider.class);
WebTarget webTarget = client.target("http://localhost:8080/api/").path("info/");
Response response = webTarget.path("123").request(MediaType.APPLICATION_JSON_TYPE).get();
System.out.println("GET Body (object): " + response.readEntity(Info.class));

我遇到了这样的异常:

...
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class java.time.LocalDateTime] from String value ('2001-12-12T13:40:30'); no single-String constructor/factory method
 at [Source: org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnCloseableInputStream@21b2e768; line: 1, column: 32] (through reference chain: com.my.poc.jerseyclient.Info["creationDateTime"])
...

我错过了什么?我用 RestTemplate(Spring 休息客户端)尝试了这个,它无需任何配置即可完美运行。

4

2 回答 2

3

jsr310 模块仍然需要向 Jackson 注册。您可以在此处执行ContextResolver操作Jsr310Module,您可以在其中注册ObjectMapper

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JSR310Module());

您然后ContextResolver向客户注册。将会发生的是JacksonJsonProvider应该调用该getContext方法,并检索ObjectMapper要用于(反)序列化的方法。

您也可以ContextResolver在服务器端使用它。如果您只需要客户端上的此功能,另一种方法是JacksonJsonProvider使用ObjectMapper. 简单一点

new JacksonJsonProvider(mapper)
于 2015-09-08T07:27:11.650 回答
1

将它们放在一起以实现客户端功能:

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JSR310Module());

JacksonJsonProvider provider = new JacksonJsonProvider(mapper);
Client client = ClientBuilder.newClient(new ClientConfig().register(provider));
于 2019-03-27T19:47:49.363 回答