我刚接触Spring Data REST项目，正在尝试创建我的第一个RESTful服务。这个任务很简单，但我卡住了。
我想在使用RESTful API时，在嵌入式数据库中对用户数据执行CRUD操作。
但我无法弄清楚如何让Spring框架将birthData处理为"1999-12-15"并将其存储为LocalDate。@JsonFormat注释没有帮助。
目前我收到以下错误：
HTTP/1.1 400
Content-Type: application/hal+json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 24 Aug 2017 13:36:51 GMT
Connection: close
{"cause":{"cause":null,"message":"Can not construct instance of java.time.LocalDate:
no String-argument constructor/factory method to deserialize from String value ('1999-10-10')\n
at [Source: org.apache.catalina.connector.CoyoteInputStream@4ee2a60e;
line: 1, column: 65] (through reference chain: ru.zavanton.entities.User[\"birthDate\"])"},
"message":"JSON parse error: Can not construct instance of java.time.LocalDate:
no String-argument constructor/factory method to deserialize from String value ('1999-10-10'); nested exception is com.fasterxml.jackson.databind.JsonMappingException:
Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value ('1999-10-10')\n
at [Source: org.apache.catalina.connector.CoyoteInputStream@4ee2a60e; line: 1, column: 65] (through reference chain: ru.zavanton.entities.User[\"birthDate\"])"}
如何让它正常工作，以便客户端可以像这样调用：
curl -i -X POST -H "Content-Type:application/json" -d "{ \"firstName\" : \"John\", \"lastName\" : \"Johnson\", \"birthDate\" : \"1999-10-10\", \"email\" : \"john@example.com\" }" http://localhost:8080/users
将实体存储到数据库中。
以下是有关类的信息。
用户类：
package ru.zavanton.entities;
import com.fasterxml.jackson.annotation.JsonFormat;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import java.time.LocalDate;
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String firstName;
private String lastName;
@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd")
private LocalDate birthDate;
private String email;
private String password;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public LocalDate getBirthDate() {
return birthDate;
}
public void setBirthDate(LocalDate birthDate) {
this.birthDate = birthDate;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
用户存储库类：
package ru.zavanton.repositories;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import ru.zavanton.entities.User;
@RepositoryRestResource(collectionResourceRel = "users", path = "users")
public interface UserRepository extends PagingAndSortingRepository<User, Long> {
User findByEmail(@Param("email") String email);
}
应用程序类：
package ru.zavanton;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}