简单了解SpringBoot HATEOAS使用方法

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-hateoas</artifactId>
</dependency>

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-hateoas</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.25</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.40</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.springframework.hateoas.ResourceSupport;

import javax.persistence.*;
import java.io.Serializable;
@Entity
@Table(name="sys_user")
public class SysUserInfo extends ResourceSupport implements Serializable{

  @Id
  @GeneratedValue
  private Long userId;
  @Column(unique=true,length=20,nullable=false)
  private String username;
  @Column(length=2,nullable=true)
  private String sex;
  @Column(length=10,nullable=true)
  private String password;

  public SysUserInfo(){

  }

  @JsonCreator
  public SysUserInfo(@JsonProperty("userId")Long userId,@JsonProperty("username")String username,
            @JsonProperty("sex")String sex,@JsonProperty("password")String password){
    this.userId = userId;
    this.username = username;
    this.sex = sex;
    this.password = password;
  }
}
....

@GetMapping("/findBySysUserId/{userId}")
  public SysUserInfo findBySysUserId(@PathVariable("userId") long userId) {
    if (LOG.isInfoEnabled()) {
      LOG.info("请求参数userId : {}" , userId);
    }
    Optional<SysUserInfo> sysUserInfo = Optional.ofNullable(sysUserRepository.findByUserId(userId));
    if (!sysUserInfo.isPresent()) {
      throw new NotFoundException("查询不到用户信息! userId:"+userId);
    }
    //Resource<SysUserInfo> resource = new Resource<SysUserInfo>(sysUserInfo.get());
    ControllerLinkBuilder linkBuilder = linkTo(methodOn(this.getClass()).findBySysUserId(userId));
    sysUserInfo.get().add(linkBuilder.withRel("findBySysUserId"));
    return sysUserInfo.get();
  }