如何使用 Spring Boot Data Rest 在同一请求中保存多个对象 [英] How to save many objects in the same request using Spring Boot Data Rest

问题描述

我尝试使用 POST 方法保存一个实体数组，传递一个数组作为剩余资源，但我有一个错误:

I'm try save a array of an Entity using POST method passing an array for rest resource, but I have an error:

org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Can not deserialize instance of br.com.servtech.almox.model.Item out of START_ARRAY token
 at [Source: org.apache.catalina.connector.CoyoteInputStream@2af1e451; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of br.com.servtech.almox.model.Item out of START_ARRAY token
 at [Source: org.apache.catalina.connector.CoyoteInputStream@2af1e451; line: 1, column: 1]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:228) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readInternal(AbstractJackson2HttpMessageConverter.java:205) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE]

我什么时候给一个对象发送数据，数据保存的很好！

When's I send one object the data, the data is saved very well!

我的实体:

@Entity
public class Item implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Basic
    private String name;

    @Basic
    private Integer quantity;

    @Basic
    private Double cash;

    @ManyToOne
    private Requirement requirement;

    //getters and setters
}

我的存储库:

@RepositoryRestResource
@CrossOrigin
public interface ItemDAO extends CrudRepository<Item, Long> {

}

数据:

[{ 
    "name": "A1", 
    "quantity": 3, 
    "cash": 5.80
}, { 
    "name": "B2", 
    "quantity": 3, 
    "cash": 5.80
}]

我尝试使用 Content-Type 应用程序/json 并与 text/uri-list 一起使用.怎么了?我再做一些设置?

I've tried to using the Content-Type application/json and using with text/uri-list. What is wrong? I do some more setup?

推荐答案

错误的是试图将您的请求正文作为 Item 读取，而实际上它是多个 Items.

What is wrong is that is trying to read your request body as an Item, when it is in fact multiple Items.

我相信您在这里有两个选择.在这种情况下，我通常会做的是创建另一个资源，例如 ItemCollection，以包装多个 Items.然后，您可以使用标准的 REST 功能来接收 ItemCollection，它基本上可以处理多个 Items.

I believe you have two choices here. What I would normally do in this situation would be to create another resource, such as ItemCollection, to wrap multiple Items. Then you could have standard REST functionality to take in an ItemCollection, which would essentially handle multiple Items.

您的第二个选择是手动覆盖处理多个项目的方法:http://docs.spring.io/spring-data/rest/docs/current/reference/html/#customizing-sdr.overriding-sdr-响应处理程序

Your second option would be to manually override a method to handle multiple itmes: http://docs.spring.io/spring-data/rest/docs/current/reference/html/#customizing-sdr.overriding-sdr-response-handlers

这篇关于如何使用 Spring Boot Data Rest 在同一请求中保存多个对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！