我有一个像/books
这样的Rest URI,在这个URI中,它将只执行与书籍相关的任何类型的GraphQL查询,查询取决于请求参数,如?id
,?name
等。
我试图使用Spring框架实现这个想法,但得到了以下错误:
Servlet.service()for servlet [dispatcherServlet] in context with path [] throughed exception〉[Circular view path [books]:将再次调度回当前处理程序URL [/books]〉。检查ViewResolver设置!(提示:这可能是由于默认视图名称生成而导致的未指定〉视图的结果。)]
jakarta.servlet.ServletException:循环视图路径[书籍]:将再次调度回〉当前处理程序URL [/books]。检查您的ViewResolver设置!(提示:这可能是一个未指定视图的〉结果,因为默认的视图名称生成。)
这样的执行力可以实现吗?如果可以,我做错了什么?
下面是Controller的代码:
package com.example.graphqlserver;
import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.graphql.data.method.annotation.SchemaMapping;
// import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class BookController {
@GetMapping("/books")
public Book getBook(@RequestParam(name = "id", defaultValue = "") String id) {
return this.bookById(id);
}
@QueryMapping
public Book bookById(@Argument String id) {
return Book.getById(id);
}
@SchemaMapping
public Author author(Book book) {
return Author.getById(book.authorId());
}
}
类的代码:
书籍:
package com.example.graphqlserver;
import java.util.Arrays;
import java.util.List;
public record Book(String id, String name, int pageCount, String authorId) {
private static List<Book> books = Arrays.asList(
new Book("book-1", "Effective Java", 416, "author-1"),
new Book("book-2", "Hitchhiker's Guide to the Galaxy", 208, "author-2"),
new Book("book-3", "Down Under", 436, "author-3"));
public static Book getById(String id) {
return books.stream()
.filter(book -> book.id().equals(id))
.findFirst()
.orElse(null);
}
}
作者:
package com.example.graphqlserver;
import java.util.Arrays;
import java.util.List;
public record Author(String id, String firstName, String lastName) {
private static List<Author> authors = Arrays.asList(
new Author("author-1", "Joshua", "Bloch"),
new Author("author-2", "Douglas", "Adams"),
new Author("author-3", "Bill", "Bryson"));
public static Author getById(String id) {
return authors.stream()
.filter(author -> author.id().equals(id))
.findFirst()
.orElse(null);
}
}
GraphQL架构:
type Query {
bookById(id: ID): Book
}
type Book {
id: ID
name: String
pageCount: Int
author: Author
}
type Author {
id: ID
firstName: String
lastName: String
}
1条答案
按热度按时间jtw3ybtb1#
我尝试将
@RestController
和@Controller
添加到Controller类中,它返回了“某种”预期结果:localhost:8080/books?id=book-1
更新代码: