我有一個(gè)名為的數(shù)據(jù)庫findall_db，其中一個(gè)表名為person... 我已手動(dòng)向該表添加了一些值，并希望使用 Spring Boot 檢索它們。這就是我所擁有的，但我的控制器中不斷出現(xiàn)此錯(cuò)誤：Type mismatch: cannot convert from Iterable<PersonInfo> to List<PersonInfo>實(shí)體類是：@Entity@Table(name = "Person")public class PersonInfo implements Serializable { private static final long serialVersionUID = 1 L; @Id @SequenceGenerator(name = "PERSON_GENERATOR", sequenceName = "PERSON_SEQ") @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "PERSON_GENERATOR") private Long id; @Column(name = "ssn") private String socialSecurityNumber; private String name; public PersonInfo() {} public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getSocialSecurityNumber() { return socialSecurityNumber; } public void setSocialSecurityNumber(String socialSecurityNumber) { this.socialSecurityNumber = socialSecurityNumber; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "PersonInfo [id=" + id + ", socialSecurityNumber=" + socialSecurityNumber + ", name=" + name + "]"; }}存儲(chǔ)庫類是：@Repositorypublic interface PersonInfoRepository extends CrudRepository < PersonInfo, Long > { }控制器是：@Controllerpublic class PersonController { @Autowired PersonInfoRepository personRepo; @ResponseBody @GetMapping("/people") public List printPersonInfo() { List < PersonInfo > people = personRepo.findAll(); System.out.println(people.toString()); return people; }}
3 回答
慕標(biāo)琳琳
TA貢獻(xiàn)1830條經(jīng)驗(yàn) 獲得超9個(gè)贊
那是因?yàn)镃rudRepository#findAll返回 anIterable而不是 a List。因此，您要么(1)更改方法簽名以返回 anIterable或者您 (2)將元素復(fù)制到 aList并返回它。
(1) 返回Iterable：
public Iterable<PersonInfo> printPersonInfo() {
return personRepo.findAll();
}
(2) 將元素復(fù)制到 aList并返回列表。
public List<PersonInfo> printPersonInfo() {
List<PersonInfo> list = new ArrayList<>();
personRepo.findAll().forEach(list::add);
return list;
}
喵喵時(shí)光機(jī)
TA貢獻(xiàn)1846條經(jīng)驗(yàn) 獲得超7個(gè)贊
@Autowired
PersonInfoRepository personRepo;
@ResponseBody
@GetMapping("/people")
public List printPersonInfo() {
List < PersonInfo > people = personRepo.findAll();
System.out.println(people.toString());
return people;
}
在這部分代碼中，您沒有初始化（強(qiáng)制轉(zhuǎn)換更好）您的控制器變量
你可以很容易地用List<PersonInfo>afterpeople =
紅顏莎娜
TA貢獻(xiàn)1842條經(jīng)驗(yàn) 獲得超13個(gè)贊
public List<PersonInfo> printPersonInfo() {
List<PersonInfo> people = personRepo.findAll()
.stream()
.collect(Collectors.toList());
System.out.println(people.toString());
return people ;
}
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