Lagom 似乎很有趣，但我很難讓事情變得簡單。好像沒看懂怎么用和hello world的例子，雖然可以用，但是不明白怎么用。我正在嘗試創(chuàng)建一個簡單的 restful 服務，該服務在其標頭中接受兩個參數(shù)并生成一個 json 對象。例如在 MyService.java 我有：public interface BookService extends Service { ServiceCall<NotUsed, String> getAllBook(); /** * @return */ @Override default Descriptor descriptor() { return named("book").withCalls( restCall(GET, "/api/get-all-book", this::getAllBook) ).withAutoAcl(true); }}然后在 BookServiceImpl 我有：public class BookServiceImpl implements BookService { private final PersistentEntityRegistry persistentEntityRegistry; /** * @param registry * @param readSide * @param session */ @Inject public BookServiceImpl(final PersistentEntityRegistry registry, ReadSide readSide, CassandraSession session) { this.persistentEntityRegistry = registry; persistentEntityRegistry.register(BookEntity.class); readSide.register(BookEventProcessor.class); } @Override public ServiceCall<NotUsed, String> getAllBook() { return request -> { JSONObject myBook= new JSONObject(); myBook.put("name","BookName"); myBook.put("description","A description"); myBook.put("price","$16"); myBook.put("status","available"); //how do I return JSONBject.toString() }; }}然后我如何放置標題參數(shù)？一些解釋基礎知識的文檔將非常有幫助。提前致謝
1 回答
慕婉清6462132
TA貢獻1804條經驗 獲得超2個贊
您需要創(chuàng)建一個實際執(zhí)行 JSON 的 POJO 類。通過在服務實現(xiàn)中使用 lombok 包：
package mybook;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Value;
import javax.annotation.concurrent.Immutable;
@Value
@Builder
@Immutable
@JsonDeserialize
@AllArgsConstructor
public class Book {
String name;
String description;
String value;
String status;
}
然后在服務中：
public interface BookService extends Service {
ServiceCall<NotUsed, Book> getAllBook();
/**
* @return
*/
@Override
default Descriptor descriptor() {
return named("book").withCalls(
restCall(GET, "/api/get-all-book", this::getAllBook)
).withAutoAcl(true);
}
}
然后在實施中：
public class BookServiceImpl implements BookService {
@Override
public ServiceCall<NotUsed, Book> getAllBook() {
return request -> {
Book myBook = Book.builder().
name("BookName").
description("A description").
price("16€").
status("available").build();
return completedFuture(myBook);
};
}
}
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