大家。我有兩個應用程序。第一個是 CRUD spring boot JPA Web mvc 應用程序。它與這些代碼一起工作得很好。（通過存儲庫數據庫）@RequestMapping(value = { "/newUser" }, method = RequestMethod.GET)public String newUser(ModelMap model) { User user = new User(); List<UserProfile> roles = userProfileRepository.findAll(); model.addAttribute("user", user); model.addAttribute("allRoles", roles); return "registration";}@RequestMapping(value = { "/newUser" }, method = RequestMethod.POST)public String saveUser(@Valid User user, BindingResult result, ModelMap model) { if (result.hasErrors()) { List<UserProfile> roles = userProfileRepository.findAll(); model.addAttribute("allRoles", roles); model.addAttribute("user", user); return "registration"; } userRepository.save(user); return "registrationsuccess";}Registration.html 的一部分是 <select class="form-control input-sm" id="userProfiles" name="userProfiles" multiple="multiple" th:required="true"> <option th:each="role : ${allRoles}" th:value="${{role}}" th:text="${role.type}" th:selected="${role.id == 1}" >Role </option> </select>上面的代碼工作正常。第二個應用程序是基于resttemplate的spring boot@RequestMapping(value = { "/newUser" }, method = RequestMethod.GET)public String newUser(ModelMap model) { User user = new User(); RestTemplate restTemplate = new RestTemplate(); List<UserProfile> userProfiles = Arrays.asList(restTemplate.getForObject("http://localhost:8080/api/roles", UserProfile[].class)); ArrayList<UserProfile> roles = new ArrayList<>(userProfiles); model.addAttribute("user", user); model.addAttribute("allRoles", roles); return "registration";}多重選擇形式與第一個應用程序相同（相同）但是第二個應用程序在調用registration.html時拋出異常附言。我已經通過 PostMan 測試了所有方法（PUT、GET、DELETE 和 POST）。而且效果很好。我不明白百里香的不同行為..
2 回答
撒科打諢
TA貢獻1934條經驗 獲得超2個贊
我剛剛實現了 org.springframework.core.convert.converter.Converter;
@Component
public class RoleToUserProfileConverter implements Converter<Object, UserProfile>{
@Autowired
UserProfileService userProfileService;
public UserProfile convert(Object element) {
Integer id = Integer.parseInt((String)element);
return userProfileService.findById(id);
}
}
并稍微修改了這個表格
<select class="form-control input-sm" id="userProfiles" name="userProfiles" multiple="multiple" th:required="true">
<option th:each="role : ${allRoles}"
th:value="${role.id}"
th:text="${role.type}"
th:selected="${role.id == 1}"
>Role
</option>
</select>
所以現在，thymeleaf 將值轉換為對象。謝謝大家！
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