未找到资源和 ControllerLinkBuilder 并已弃用

Question

我正在使用 Spring 带有 HATEOAS 和 Gradle 的 Boot 2.2.0.M1。

implementation 'org.springframework.boot:spring-boot-starter-hateoas'

现在，IDE（IntelliJ IDEA 2018.3）找不到 Resource，ControllerLinkBuilder 被标记为 已弃用.

package com.example.restfulwebservicegradle.user;

import static org.springframework.hateoas.server.mvc.ControllerLinkBuilder.linkTo;
import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.methodOn;

import com.example.restfulwebservicegradle.User;
import com.example.restfulwebservicegradle.UserDaoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.hateoas.server.mvc.ControllerLinkBuilder;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import javax.validation.Valid;
import java.net.URI;
import java.util.List;

@RestController
public class UserResource {

    @Autowired
    private UserDaoService service;

    @GetMapping("users/{id}")
    public Resource<User> retrieveUser(@PathVariable int id) {
        User user = service.findOne(id);

        if (user == null)
            throw new UserNotFoundException("id-" + id);


        // Resource not found
        Resource<User> resource = new Resource<User>(user);

        // Deprecated
        ControllerLinkBuilder linkTo = linkTo(methodOn(this.getClass()).retrieveAllUsers());

        resource.add(linkTo.withRel("all-users"));

        return resource;
    }
}

根据 IDE 可用的进口有：

我该如何解决这个问题？

我的目标是从 HATEOAS 找到 Resource 并使用 ControllerLinkBuilder 的替代品。

Answer 1

最根本的变化是 Spring HATEOAS 不创建资源。这就是 Spring MVC/Spring WebFlux 所做的。我们创建超媒体的供应商中立表示。所以我们重命名了那些核心类型：

LINK- https://spring.io/blog/2019/03/05/spring-hateoas-1-0-m1-released#overhaul

ResourceSupport 现在是 RepresentationModel
资源现在是 EntityModel
Resources 现在是 CollectionModel
PagedResources 现在是 PagedModel

Answer 2

包结构的最大变化是引入了超媒体类型注册 API 以支持 Spring HATEOAS 中的其他媒体类型。

https://docs.spring.io/spring-hateoas/docs/current/reference/html/

Answer 3

Resource被EntityModel取代，ControllerLinkBuilder被WebMvcLinkBuilder

取代

Answer 4

正如其他编码员所提到的，HATEOAS 发生了许多变化（弃用），因此请使用以下代码：

@RestController
public class UserResource {

    @Autowired
    private UserDaoService service;

    @GetMapping("users/{id}")
    public Resource<User> retrieveUser(@PathVariable int id) {
        User user = service.findOne(id);

        if (user == null)
            throw new UserNotFoundException("id-" + id);

        //Resource has been replaced by EntityModel
        EntityModel<User> resource = EntityModel.of(user);

        //ControllerLinkBuilder has been replace by WebMvcLinkBuilder
        Link link= WebMvcLinkBuilder.linkTo(methodOn(this.getClass()).retrieveAllUsers()).withRel("all-users");

        resource.add(link);
        return resource;
    }
}

这是 spring-hateoas 依赖项，您应该将其添加到 pom.xml:

<dependency>
    <groupId>org.springframework.hateoas</groupId>
    <artifactId>spring-hateoas</artifactId>
    <version>1.1.0.RELEASE</version>
</dependency>

Answer 5

UserResource controller = methodOn(UserResource.class);
    EntityModel<User> resource = EntityModel.of(user);

    Link link= WebMvcLinkBuilder.linkTo(controller
            .retriveAllUser()).withRel("all-users");

    resource.add(link);
    return resource;

这里 UserResource 是控制器 retriveAllUser 是您要公开的方法

Answer 6

链接到其他回复...以下代码对我来说工作正常...

UserResource.java

package com.---.---.restfulwebservices.user;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.hateoas.EntityModel;
import org.springframework.hateoas.Link;
import org.springframework.hateoas.server.mvc.WebMvcLinkBuilder;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import javax.validation.Valid;
import java.net.URI;
import java.util.List;

import static org.springframework.hateoas.server.mvc.WebMvcLinkBuilder.methodOn;

@RestController
public class UserResource {
    @Autowired
    private UserDaoService service;

    @GetMapping(path = "/users")
    public List<User> retrieveAllUsers() {
        return service.findAll();
    }

    @GetMapping(path = "/users/{id}")
    public EntityModel<User> retrieveUser(@PathVariable int id) {
        User user = service.findOne(id);
        if (null == user)
            throw new UserNotFoundException("id-" + id);

        EntityModel<User> entityModel = EntityModel.of(user);
        Link link= WebMvcLinkBuilder.linkTo(
                methodOn(this.getClass()).retrieveAllUsers()).withRel("all-users");
        entityModel.add(link);
        return entityModel;
    }

    @PostMapping(path = "/users")
    public ResponseEntity<Object> createUser(@Valid @RequestBody User user) {
        User newUser = service.saveUser(user);
        URI path = ServletUriComponentsBuilder.fromCurrentRequest()
                .path("/{id}").buildAndExpand(newUser.getId()).toUri();
        return ResponseEntity.created(path).build();
    }

    @DeleteMapping(path = "/users/{id}")
    public User deleteUser(@PathVariable int id) {
        User deletedUser = service.deleteUserByID(id);
        if (null == deletedUser)
            throw new UserNotFoundException("id-" + id);
        return deletedUser;
    }
}

pom.xml 依赖关系：

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

未找到资源和 ControllerLinkBuilder 并已弃用

Resource and ControllerLinkBuilder not found and deprecated

spring-hateoas

spring-boot