我尝试在 Spring Boot 上将 json 对象传递给 api。在我使用邮递员传递值之前，一切都很好。格式如下：
{
"shortname": "test2",
"fullname": "testing2",
"address": "addrtest2",
"telephone": "380979379993",
"website": "www.site2.com",
"sociallinks":
{
"facebook": "fb2.com"
},
"foundationyear": "1992"
}
现在在我的 Angular 应用程序中，我传递 json 如下：
{"shortname":"test","fullname":"Bogdan Onyshenko","address":"Пр. Победы 72в","telephone":"0669829242","website":"http://193.70.37.242/index.php?route=extension/feed/google_sitemap","foundationyear":"2004","sociallinks":[{"network":"facebook","linkpage":"fb.com"}]}
我知道值改变了一点。但是现在我被困在如何重新声明错误所指向的字段社交链接的类型。这是它现在在模型类中声明的方式：
@Column(name = "sociallinks")
@Convert(converter = StringMapConverter.class)
private Map<String, String> sociallinks;
还有一个转换器类：
package com.example.helpers;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.AttributeConverter;
import javax.persistence.Converter;
@Converter
public class StringMapConverter implements AttributeConverter<Map<String, String>, String> {
private static ObjectMapper mapper;
static {
// To avoid instantiating ObjectMapper again and again.
mapper = new ObjectMapper();
}
@Override
public String convertToDatabaseColumn(Map<String, String> data) {
if (null == data) {
// You may return null if you prefer that style
return "{}";
}
try {
return mapper.writeValueAsString(data);
} catch (IOException e) {
throw new IllegalArgumentException("Error converting map to JSON", e);
}
}
@Override
public Map<String, String> convertToEntityAttribute(String s) {
if (null == s) {
// You may return null if you prefer that style
return new HashMap<>();
}
try {
return mapper.readValue(s, new TypeReference<Map<String, String>>() {});
} catch (IOException e) {
throw new IllegalArgumentException("Error converting JSON to map", e);
}
}
}
然而问题是如何重新声明一个社交链接字段以正确发送第二个请求。
更新
我将该字段重新声明为列表
@Column(name = "sociallinks")
//@Convert(converter = StringMapConverter.class)
private List<String> sociallinks;
但是在终端中获得以下输出
2022-01-20 08:36:07.040 DEBUG 18908 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : POST "/buildcompanies/add", parameters={}
2022-01-20 08:36:07.040 DEBUG 18908 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to com.example.controller.BuildingcompaniesController#createCompany(Buildcompanies)
2022-01-20 08:36:07.042 DEBUG 18908 --- [nio-8080-exec-3] o.s.web.method.HandlerMethod : Could not resolve parameter [0] in public org.springframework.http.ResponseEntity<com.example.model.Buildcompanies> com.example.controller.BuildingcompaniesController.createCompany(com.example.model.Buildcompanies): JSON parse error: Cannot deserialize value of type `java.util.ArrayList<java.lang.Object>` from Object value (token `JsonToken.START_OBJECT`); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.util.ArrayList<java.lang.Object>` from Object value (token `JsonToken.START_OBJECT`)
at [Source: (PushbackInputStream); line: 1, column: 230] (through reference chain: com.example.model.Buildcompanies["sociallinks"]->java.util.ArrayList[0])
2022-01-20 08:36:07.042 WARN 18908 --- [nio-8080-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize value of type `java.util.ArrayList<java.lang.Object>` from Object value (token `JsonToken.START_OBJECT`); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize value of type `java.util.ArrayList<java.lang.Object>` from Object value (token `JsonToken.START_OBJECT`)<EOL> at [Source: (PushbackInputStream); line: 1, column: 230] (through reference chain: com.example.model.Buildcompanies["sociallinks"]->java.util.ArrayList[0])]
2022-01-20 08:36:07.042 DEBUG 18908 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : Completed 400 BAD_REQUEST
2022-01-20 08:36:07.043 DEBUG 18908 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : "ERROR" dispatch for POST "/error", parameters={}
2022-01-20 08:36:07.043 DEBUG 18908 --- [nio-8080-exec-3] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
2022-01-20 08:36:07.043 DEBUG 18908 --- [nio-8080-exec-3] o.s.w.s.m.m.a.HttpEntityMethodProcessor : Using 'application/json', given [application/json] and supported [application/json, application/*+json, application/json, application/*+json]
2022-01-20 08:36:07.043 DEBUG 18908 --- [nio-8080-exec-3] o.s.w.s.m.m.a.HttpEntityMethodProcessor : Writing [{timestamp=Thu Jan 20 08:36:07 EET 2022, status=400, error=Bad Request, path=/buildcompanies/add}]
2022-01-20 08:36:07.044 DEBUG 18908 --- [nio-8080-exec-3] o.s.web.servlet.DispatcherServlet : Exiting from "ERROR" dispatch, status 400
更新 2 如果有帮助，请发布大厅实体课程
package com.example.model;
import java.beans.Transient;
import java.util.List;
import java.util.Map;
import javax.persistence.Column;
import javax.persistence.Convert;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import com.example.helpers.StringMapConverter;
@Entity
@Table(name = "buildingcompanies")
public class Buildcompanies {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(name = "shortname")
private String shortname;
@Column(name = "fullname")
private String fullname;
@Column(name = "address")
private String address;
@Column(name = "telephone")
private String telephone;
@Column(name = "website")
private String website;
@Column(name = "sociallinks")
@Convert(converter = StringMapConverter.class)
private List<String> sociallinks;
@Column(name = "foundationyear")
private String foundationyear;
private transient double rating;
public Buildcompanies() {
}
public Buildcompanies(String shortname, String fullname, String address, String telephone, String website,
List<String> map, String foundationyear) {
this.shortname = shortname;
this.fullname = fullname;
this.address = address;
this.telephone = telephone;
this.website = website;
this.sociallinks = map;
this.foundationyear = foundationyear;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getShortname() {
return shortname;
}
public void setShortname(String shortname) {
this.shortname = shortname;
}
public String getFullname() {
return fullname;
}
public void setFullname(String fullname) {
this.fullname = fullname;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getTelephone() {
return telephone;
}
public void setTelephone(String telephone) {
this.telephone = telephone;
}
public String getWebsite() {
return website;
}
public void setWebsite(String website) {
this.website = website;
}
public List<String> getSociallinks() {
return sociallinks;
}
public void setSociallinks(List<String> sociallinks) {
this.sociallinks = sociallinks;
}
public String getFoundationyear() {
return foundationyear;
}
public void setFoundationyear(String foundationyear) {
this.foundationyear = foundationyear;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
}
更新 3 这是我的控制器功能：
@PostMapping("/add")
public ResponseEntity<Buildcompanies> createCompany(@RequestBody Buildcompanies company) {
try {
Buildcompanies _company = buildcompaniesRepository
.save(new Buildcompanies(company.getFullname(), company.getShortname(), company.getAddress(), company.getTelephone(), company.getWebsite(), company.getSociallinks(), company.getFoundationyear()));
return new ResponseEntity<>(_company, HttpStatus.CREATED);
} catch (Exception e) {
System.out.println(e.getMessage());
return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);
}
}