在Spring Boot中无法解析JSON[重复]

Question

我试图在spring Boot中将在JSON中得到的响应存储在数据库中。但是当它显示JSON解析错误时

这是我的JSON响应

[
{
id: 1,
name: "Bilbo Baggins",
location: "india",
email: "jba2hba.com",
dateOfBirth: "2020-12-21T13:13:38.000+00:00"
},
{
id: 2,
name: "Frodo Baggins",
location: "bhutan",
email: "[e-mail]",
dateOfBirth: "2020-12-21T13:13:38.000+00:00"
}
]

    @Entity
    public class Employee {
        
        private @Id @GeneratedValue( strategy = GenerationType.AUTO ) Long id;
        private String name;
        private String location;
        private String email;
        private Date dateOfBirth;
    
        public Employee() {
        }
    
        public Employee(String name, String location, String email, Date date) {
    
            this.name = name;
            this.location = location;
            this.email = email;
            this.dateOfBirth = date;
        }
//getters and setters

我的getEmployees（）方法

public void getEmployees() {
        
        RestTemplate restTemplate = new RestTemplate();
        Employee result = restTemplate.getForObject(Constants.URI, Employee.class);
        System.out.println(result);
        }

这是我得到的错误

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `com.nagarro.hrLogin.entity.Employee` out of START_ARRAY token
 at [Source: (PushbackInputStream); line: 1, column: 1]
    at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59) ~[jackson-databind-2.11.3.jar:2.11.3]
    at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1468) ~[jackson-databind-2.11.3.jar:2.11.3]
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1242) ~[jackson-databind-2.11.3.jar:2.11.3]
    at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1190) ~[jackson-databind-2.11.3.jar:2.11.3]
    at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeFromArray(BeanDeserializer.java:604) ~[jackson-databind-2.11.3.jar:2.11.3]
//

我想不出是什么造成了这个错误，如果有人能给我一些建议，那将会很有帮助

Answer 1

您只需尝试将列表反序列化为对象。

您可以按以下方式通过ParameterizedTypeReference：

ResponseEntity<List<Employee>> response = this.restTemplate.exchange("URL", HttpMethod.GET,null,new ParameterizedTypeReference<List<Employee>>(){});

另一方面，我认为外化实体本身是一个反模式，试着看看DTO设计模式。

第二种情况：您必须将一个employee对象发送到两个应用程序，其中一个只请求名称，另一个只请求名字，在这种情况下，您将有一个或多个输出DTO with mapper（如示例mapstruct或dozer）用于向请求应用程序输出。