Java 春季休息的子资源
我正在尝试创建messanger应用程序 我必须从MessageResource调用CommentResource 我需要单独的MessageResources和CommentResources 我在做这样的事情: MessageResource.javaJava 春季休息的子资源,java,rest,spring-mvc,spring-boot,request-mapping,Java,Rest,Spring Mvc,Spring Boot,Request Mapping,我正在尝试创建messanger应用程序 我必须从MessageResource调用CommentResource 我需要单独的MessageResources和CommentResources 我在做这样的事情: MessageResource.java @RestController @RequestMapping("/messages") public class MessageResource { MessageService messageService = new Mess
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
@RequestMapping(value = "/{messageId}/comments")
public CommentResource getCommentResource() {
return new CommentResource();
}
}
@RestController
@RequestMapping("/")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
// as usual messages related CRUD operations
}
@RestController
@RequestMapping("messages/{messageId}/comments")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
CommentResource.java
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
@RequestMapping(value = "/{messageId}/comments")
public CommentResource getCommentResource() {
return new CommentResource();
}
}
@RestController
@RequestMapping("/")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
// as usual messages related CRUD operations
}
@RestController
@RequestMapping("messages/{messageId}/comments")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
我想要
返回“这是测试注释”
有什么想法吗
PS:简单地说,我想知道JAX-RS子资源spring rest中的等效实现您的url()表明注释嵌套在消息中。您的控制器应如下所示:
@RestController
@RequestMapping("/messages")
public class MessageResource {
@RequestMapping(value = "/{messageId}")
public String getCommentResource(@PathVariable("messageId") String messageId) {
//test
return messageId;
}
@RequestMapping(value = "/{messageId}/comments/{commentsContent}")
public String getCommentResource(
@PathVariable("messageId") String messageId,
@PathVariable("commentsContent") String commentsContent) {
//test
return messageId + "/" + commentsContent;
}
}
我不完全确定您希望在MessageResource类中执行什么操作,但想法就在这里
Rest-HTTP方法
目前,这些使用是Get请求。然而,您应该考虑使用适当的HTTP方法:
- 获取:读取资源
- Post:创建一个资源
- Put:更新
- 删除:删除:)
看看这个:
以Post为例:
您所寻找的内容在JAX-RS
实现中得到支持,如Sub-Resources
。在构建嵌套在自然界中的大型API时,子资源是非常有用的特性
Spring引导默认rest实现不是一个JAX-RS
,而是SpringMVC
。虽然可以在Spring Boot中使用Jersey,但它的设置有点复杂,在社区中似乎没有得到很好的使用/支持
顺便说一句,这真是太棒了 我还被迫从JAX-RS迁移到SpringMVC
我仍然在寻找一种优雅的方法来实现这一点,就像我使用JAX-RS一样
我在分享我的尝试
@RestController
@RequestMapping("parents")
public class ParentsController {
@RequestMapping(method = RequestMethod.GET,
produces = {MediaType.APPLICATION_JSON_VALUE})
public ResponseEntity<List<Parent>> read() {
}
@RequestMapping(method = RequestMethod.GET,
path = "/{id:\\d+}",
produces = {MediaType.APPLICATION_JSON_VALUE})
public ResponseEntity<Parent> read(@PathVariable("id") final long id) {
}
}
我发现了两个问题
@PathVariable
不适用于字段。
我就是不能做@PathVariable(“parentId”)私有长parentId代码>
对于ChildrenController
JAX-RS的一个优点是我们可以为不同的路径映射ChildrenController
,就像ChildrenController
有一个类级别的@Path
@Path("/children");
public class ChildrenResource {
}
@Path("/parents")
public class ParentsResource {
@Path("/{id}/children")
public ChildrenResource resourceChildren() {
}
}
/children
/parents/{id}/children
你可以保持简单。只需创建两个类,并使用常量引用子资源和父资源。这有助于在两个类之间建立链接,并使开发人员了解它们之间的关系
因此:
以及:
您还可以将控制器拆分到不同的包中,并在包组织中显示此层次结构:
com.company.web.message.MessageController
com.company.web.message.comment.CommentController
在Spring引导中,我们可以使用@AutowiredSpring概念实现JAX-RS子资源概念。创建子资源类的对象,Spring将在运行时初始化并返回该对象。不要手动创建对象。
比如:
上述情景
- MessageResource.java
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
@Autowired
@Qualifier("comment")
CommentResource comment;
@RequestMapping(value = "/{messageId}/comments")
public CommentResource getCommentResource() {
return comment;
}
}
- CommentResource.java
@RestController("comment")
@RequestMapping("/")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
Now it will work like sub-resource
http://localhost:8080/messages/1/comments/abc
You can send any type of request.
MessagesController.java
@RestController
@RequestMapping(value = "/messages")
public class MessageController {
@Autowired
private MessagesService messageService;
}
@RestController
@RequestMapping("/messages/{messageId}/comments")
public class CommentController {
@GetMapping
public List<Comment> getComments(@PathVariable("messageId") Long messageId) {
System.out.println("Get "+messageId);
return null;
}
}
CommentController.java
@RestController
@RequestMapping(value = "/messages")
public class MessageController {
@Autowired
private MessagesService messageService;
}
@RestController
@RequestMapping("/messages/{messageId}/comments")
public class CommentController {
@GetMapping
public List<Comment> getComments(@PathVariable("messageId") Long messageId) {
System.out.println("Get "+messageId);
return null;
}
}
@RestController
@请求映射(“/messages/{messageId}/comments”)
公共类控制器{
@GetMapping
公共列表getComments(@PathVariable(“messageId”)长messageId){
System.out.println(“Get”+messageId);
返回null;
}
}
MessageResource.java
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
@RequestMapping(value = "/{messageId}/comments")
public CommentResource getCommentResource() {
return new CommentResource();
}
}
@RestController
@RequestMapping("/")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
// as usual messages related CRUD operations
}
@RestController
@RequestMapping("messages/{messageId}/comments")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
CommentResource.java
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
@RequestMapping(value = "/{messageId}/comments")
public CommentResource getCommentResource() {
return new CommentResource();
}
}
@RestController
@RequestMapping("/")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
@RestController
@RequestMapping("/messages")
public class MessageResource {
MessageService messageService = new MessageService();
// as usual messages related CRUD operations
}
@RestController
@RequestMapping("messages/{messageId}/comments")
public class CommentResource {
private CommentService commentService = new CommentService();
@RequestMapping(method = RequestMethod.GET, value="/abc")
public String test2() {
return "this is test comment";
}
}
为什么要尝试从另一个控制器方法而不是某种值返回控制器?既然您希望此资源具有路径/messages/1/comments/abc,为什么要将其映射到/而不是/messages/{messageId}/comments?我想将CommentResource构建为MessageResource的子资源,并将CommentAPI保留在CommentResource中。使用MessageResource中的“/{messageId}/comments”,我想将所有请求重定向到CommentResource。如果我将/messages/{messageId}/comments/abc放入我的MessageResource类中,它就会工作。但我想把它分开,因为/abc与评论相关,而不是消息。@prranay您有没有找到与Spring类似的方法?很明显,那些评论员不明白你想做什么。你的解决方案工作得很好,但我想把这两个控制器分开,不想合并。是的,它解决了问题,代码看起来很干净,因为MessageResource只包含消息API,而CommentResource包含评论API。下面是我正在使用的代码,您的解决方案为我研究这个问题提供了新的方向。谢谢:)@RestController@RequestMapping(“/messages/{messageId}/comments”)公共类CommentResource{/////会更好。由于注释始终是某些消息的一部分,并且您必须具有一些消息Id才能获取注释。因此尽可能多地使用公共uri路径到类级别更好。您没有回答他的问题。他要求提供JAX-RS子资源替代方案,您只是向他展示了如何提供REST服务ice a URL的工作方式很有魅力!遗憾的是,我在官方文档中找不到这样的示例。您是如何运行它的?它需要一些配置吗?在当前版本的spring boot(2.2.4.RELEASE)上它将CommentResource视为要序列化的响应值。如果我添加一个带有getter的字段,我会得到它的json表示。调用get时,我会得到404。我不知道如何理解这一点。首先,“public CommentResource getCommentResource()”返回CommentResource,但不会将messageId上下文注入其中或以任何方式使用它。因此,我不确定这是回答中的错误还是我的知识差距-请澄清。此外,注释资源的路径“Comment”与“comments”不同-例如单数vs.复数,所以我不确定这是否是故意的-我认为这是一个错误。感谢您的更正或回复。