Question

我正在将Spring Boot 2.2.0.M1与HATEOAS和Gradle一起使用。

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

现在，IDE（IntelliJ IDEA 2018.3）找不到Resource，并且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可用的导入为：

我该如何解决？

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

Answer 1

Resource替换为EntityModel，ControllerLinkBuilder替换为WebMvcLinkBuilder

Answer 2

最根本的变化是Spring HATEOAS不会创建资源。这就是Spring MVC / Spring WebFlux的功能。我们创建超媒体的供应商中立表示。因此，我们重命名了这些核心类型：

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
资源现在为CollectionModel
PagedResources现在是PagedModel

Answer 3

包装结构的最大变化是通过引入超媒体类型注册API来实现的，以支持Spring HATEOAS中的其他媒体类型。

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

Answer 4

正如其他编码人员所提到的那样，HATEOAS中发生了许多更改（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        //Resource has been replaced by EntityModel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，应将其添加到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是控制者 retriveAllUser是您要公开的方法

Answer 6

链接到其他回复...以下代码对我来说效果很好...

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依赖项：

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

找不到资源和ControllerLinkBuilder并已弃用

6 个答案: