Spring-bootmongodb-如何將MongoRepository保存回應轉換為自定義類并作為JSON回傳

我正在嘗試spring-boot與mongodb. 我已經關注了在線文章和教程，并且示例應用程式可以很好地將字串作為 API 回應回傳。但是當我嘗試使用 JSON 回傳回應時ResponseEntity出現錯誤。

這是代碼：

src/customerapi/model/Customer.java

package com.customerapi.model;

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString

@Document(collation = "customer")
public class Customer {
    @Id
    private String custRefId;
    
    private String title;

    private String firstName;
    
    private String middleName;

    private String lastName;
    
    private String businessName;

    private String email;

    private String phone;

    private String note;
    
    private String dateOfBirth;

    private String sex;
    
    
}

src/customerapi/dto/CustomerResponse.java

package com.customerapi.dto;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonInclude.Include;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString
@JsonInclude(Include.NON_NULL)
public class CustomerResponse {
    @JsonProperty("custRefId")
    private String custRefId;
    
}

src/customerapi/repository/CustomerRepository.java

package com.customerapi.repository;

import org.springframework.data.mongodb.repository.MongoRepository;

import com.customerapi.dto.CustomerResponse;
import com.customerapi.model.Customer;

public interface CustomerRepository extends MongoRepository<Customer, String> {
}

src/customerapi/resource/CustomerController.java

package com.customerapi.resource;

import static java.util.concurrent.TimeUnit.MILLISECONDS;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import com.customerapi.repository.CustomerRepository;
import com.customerapi.model.Customer;
import com.customerapi.dto.CustomerResponse;

@RestController
public class CustomerController {
    
    @Autowired
    private CustomerRepository customerRepository;
    
    @PostMapping(value="/addCustomer", produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseStatus(HttpStatus.CREATED)
    public ResponseEntity<CustomerResponse> saveCustomer(@RequestBody Customer customer) {
        
        try {
            return new ResponseEntity<CustomerResponse>(new customerRepository.save(customer), HttpStatus.CREATED);
        }finally {
            System.out.println("Issue with saving data in DB");
        }
    }
}

回傳 a stringfromsaveCustomer()作業正常。但是，當我嘗試回傳ResponseEntity<CustomerResponse>并到達 Postman 中的端點時，出現此錯誤。

我在網上搜索并從 stackoverflow 的答案中嘗試了多種方法，但似乎沒有任何效果對我有用。

**如何將MongoRepository的save回應轉換為自定義類并使用 JSON 作為 JSON 回傳ResponseEntity？**

uj5u.com熱心網友回復：

在這里new CustomerResponse(customerRepository.save(customer))。內部CustomerResponse沒有接受Customer作為引數的構造函式。你可以創建一個。所以你CustomerResponse 會看起來像這樣。

import com.customerapi.model.Customer;

@Getter
@Setter
@ToString
@JsonInclude(Include.NON_NULL)
public class CustomerResponse {
    @JsonProperty("custRefId")
    private String custRefId;
    
    public CustomerResponse(Customer customer){
        this.custRefId = customer.getCustRefId();
    }
}

標籤：爪哇 MongoDB 弹簧靴

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