我有一个SpringBoot应用程序。 我有一个简单的RestController:
@RestController
public class ClientController {
private static final Logger logger = Logger.getLogger(ClientController.class);
@Autowired ClientService clientService;
@RequestMapping(value = "/client", method = RequestMethod.GET)
public ResponseEntity<Client> getClient(@RequestParam(value = "idClient") int idClient)
{
Client client = clientService.findById(idClient);
return new ResponseEntity<Client>(client, HttpStatus.OK);
}
Client.java有2个OneToMany字段,Luce和Posto,以这种方式注释:
@OneToMany(fetch = FetchType.EAGER, cascade=CascadeType.ALL, mappedBy = "client")
public List<Posto> getPosti() {
return posti;
}
public void setPosti(List<Posto> posti) {
this.posti = posti;
}
@OneToMany(fetch = FetchType.EAGER, cascade=CascadeType.ALL, mappedBy = "client")
public List<Luce> getLuci() {
return luci;
}
public void setLuci(List<Luce> luci) {
this.luci = luci;
}
当我尝试调用该网址时,我得到了一个奇怪的响应行为。
让我们说我有2个Posto和2个Luci对象。
Posto对象链接到idClient = 1,只有一个Luce链接到idClient = 1。
所以,如果我点击,例如,http://localhost:8080/client?idClient=1
我应该得到2 Posto和1 Luce,但我得到以下回复(为了简洁起见,我删除了一些不重要的字段):
{
"idClient": 1,
"posti": [
{
"idPosto": 1,
"numeroPosto": 61,
"nomePosto": "Posto numero 61"
},
{
"idPosto": 2,
"numeroPosto": 152,
"nomePosto": "Posto numero 62"
}
],
"luci": [
{
"idLuce": 1,
"numeroLuce": 1,
"nomeLuce": "Lampada 1",
},
{
"idLuce": 1,
"numeroLuce": 1,
"nomeLuce": "Lampada 1",
}
]
}
所以我得到了相同Luce对象的2倍。它也发生了我的情况是倒置的,2 Luce和1 Posto,我得到两倍的唯一Posto。 如果所有Posto和Luce对象都链接到idClient 1,那么响应是好的,如果我没有用于IdClient的Luce(或没有Posto),那也很好... 我不知道在哪里看,一切似乎都有效,我没有错误......
答案 0 :(得分:1)
更改列表以在Client.java
类
@OneToMany(fetch = FetchType.EAGER, cascade=CascadeType.ALL, mappedBy = "client")
public Set<Posto> getPosti() {
return posti;
}
public void setPosti(Set<Posto> posti) {
this.posti = posti;
}
@OneToMany(fetch = FetchType.EAGER, cascade=CascadeType.ALL, mappedBy = "client")
public Set<Luce> getLuci() {
return luci;
}
public void setLuci(Set<Luce> luci) {
this.luci = luci;
}
并实现Client.java
类hascode()和equals()方法,因为Set
对象不采用dublicate数据