Spring Boot(2.3.6.Release)反序列化在使用RestTemplate和解包根时失败

Question

"Response": {
        "Count": 77,
        "Data": [
            {
                "AllowDelete": "1",
                "ContactCount": 1482,
                "CreatedDate": "Dec 01, 2020",
                "ID": "17991951",
                "IsImporting": "0",
                "IsMasterUnsubscribe": "0",
                "ListAudited": "1",
                "ListDescription": "City of Markham Staff - December 2020 (LATEST)",
                "ListImportV3": "1",
                "ListType": "0",
                "ModifiedDate": "Dec 03, 2020",
                "Name": "City of Markham Staff - December 2020 (LATEST)",
                "NameShort": "City of Markham Staff - December 2020 (LATEST)",
                "PermissionPassList": "0",
                "Segments": [],
                "Status": ""
            },{
                "AllowDelete": "0",
                "ContactCount": 884,
                "CreatedDate": "Nov 04, 2011",
                "ID": "582203",
                "IsImporting": "0",
                "IsMasterUnsubscribe": "1",
                "ListAudited": "1",
                "ListDescription": "Master Unsubscribe List",
                "ListImportV3": "0",
                "ListType": "0",
                "ModifiedDate": "Dec 04, 2020",
                "Name": "Master Unsubscribe List",
                "NameShort": "Master Unsubscribe List",
                "PermissionPassList": "0",
                "Segments": [],
                "Status": ""
            }
        ],
        "Status": "1"
    }
}

以下是我的主要POJO：

package com.markham.enews.model;

import java.util.List;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRootName;

@JsonIgnoreProperties(ignoreUnknown = true)
@JsonRootName(value = "Response")
public class Contact {

    //Total number
    private int count;

    //1 if successful, -1 if error
    private String status;

    // Further details of the Contact List
    private List<ContactFullRecord> data;

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<ContactFullRecord> getData() {
        return data;
    }

    public void setData(List<ContactFullRecord> data) {
        this.data = data;
    }

    @Override
    public String toString() {
        return "Contact [count=" + count + ", status=" + status + ", data=" + data + "]";
    }

}

根据这个堆栈溢出链接Spring Boot Jackson的根名

我在应用程序.属性中添加了以下内容：

spring.jackson.mapper.accept-case-insensitive-properties=true
spring.jackson.deserialization.unwrap-root-value=true

@GetMapping(value = "/ContactTest")
private Contact getContactTest() {

    String uri = "https://clientapi.benchmarkemail.com/Contact/";
    RestTemplate restTemplate = new RestTemplate();

    HttpEntity<String> request = new HttpEntity<String>(createHeaders());
    ResponseEntity<Contact> response = restTemplate.exchange(uri, HttpMethod.GET, request, Contact.class);

    Contact contact = response.getBody();

    return contact;
}

    @Test
public void wrapRootValue() throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true);
    mapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true);
    String str = "{    \"Response\": {\"Count\": 77,\"Data\": [{\"AllowDelete\": \"0\",\"ContactCount\": 884,\"CreatedDate\": \"Nov 04, 2011\",\"ID\": \"582203\",\"IsImporting\": \"0\",\"IsMasterUnsubscribe\": \"1\",\"ListAudited\": \"1\",\"ListDescription\": \"Master Unsubscribe List\",\"ListImportV3\": \"0\",\"ListType\": \"0\",\"ModifiedDate\": \"Dec 03, 2020\",\"Name\": \"Master Unsubscribe List\",\"NameShort\": \"Master Unsubscribe List\",\"PermissionPassList\": \"0\",\"Segments\": [],\"Status\": \"\"}],\"Status\": \"1\"}}";
    Contact root = mapper.readValue(str, Contact.class);
    System.out.println(root);
}

Contact [count=77, status=1, data=[ContactFullRecord [id=582203, name=Master Unsubscribe List, nameShort=Master Unsubscribe List, status=, contactCount=884.0, createdDate=Nov 04, 2011, modifiedDate=Dec 03, 2020, permissionPassList=0, listAudited=1, listDescription=Master Unsubscribe List, isImporting=0, isMasterUnsubscribe=1, allowDelete=0, listImportV3=0]]]

Answer 1

使用spring boot预配置的RestTemplateBuilder（应用了所有jackson消息转换器配置），并使用Build请求新的RestTemplate实例。

@Configuration
public class RestTemplateConfig {

   @Bean
   public RestTemplate restTemplate(RestTemplateBuilder restTemplateBuilder) {
      return restTemplateBuilder.build();
   }

}

将实例自动连接到controller类中。

@Autowired 
private RestTemplate restTemplate;

@GetMapping(value = "/ContactTest")
private Contact getContactTest() {

    String uri = "https://clientapi.benchmarkemail.com/Contact/";

    HttpEntity<String> request = new HttpEntity<String>(createHeaders());
    ResponseEntity<Contact> response = restTemplate.exchange(uri, HttpMethod.GET, request, Contact.class);

    Contact contact = response.getBody();

    return contact;
}

您还可以查看https://www.baeldung.com/spring-rest-template-builder以获得其他设置。