我正在尝试为 Spring MVC 简单 CRUD 控制器找到最佳实践方法。网络上和这个论坛上都有很多 CRUD 控制器的示例，但它们中的大多数都存在以下两个问题之一：
- 保存/更新或删除后，它们会显示保存和更新发生的消息，但他们点击的 URL 上仍然有“/update/{id}”或“/delete/{id}”。这是“错误的”，因为显示的内容通常是对象列表。
或者
- 控制器重定向到“showAll”视图，但是没有消息表明发生了操作，这对用户不友好。
有没有人有没有这两个问题的crud控制器的例子？
谢谢，
亨利
@Controller
@RequestMapping(value="/role")
public class RoleController {
private static final Logger log = Logger.getLogger(RoleController.class);
@Autowired
private RoleValidator validator = null;
@Autowired
private RoleService service = null;
public void setService(RoleService service) {
this.service = service;
}
public void setValidator(RoleValidator validator) {
this.validator = validator;
}
@RequestMapping(method=RequestMethod.GET)
public String showForm(ModelMap model){
List<Role> domainObjectList = service.getRoles();
model.addAttribute("domainObjectList", domainObjectList);
return "role";
}
@RequestMapping(value="/add", method=RequestMethod.GET)
public String preAdd(ModelMap model){
Role domainObject = new Role();
model.addAttribute("domainObject", domainObject);
addConstrainedFields(model);
return "roleEdit";
}
@RequestMapping(value="/add", method=RequestMethod.POST)
public ModelAndView add(@ModelAttribute(value="domainObject") Role domainObject, BindingResult result) {
validator.validate(domainObject, result);
ModelAndView mv = new ModelAndView("role");
if(result.hasErrors()){
mv = new ModelAndView("roleEdit");
mv.addObject("domainObject", domainObject);
return mv;
}
service.insertRole( domainObject );
mv.addObject("domainObjectList", service.getRoles());
mv.addObject("messageKey","label.form.item.added");
//PROBLEM: the URL will remain "/add", but the content will be one of showing all roles + message that role was added.
return mv;
}
@RequestMapping(value="/update/{id}")
public String preUpdate(@PathVariable Integer id, ModelMap model) {
Role domainObject = service.getRole( id );
model.addAttribute("domainObject", domainObject);
return "roleEdit";
}
@RequestMapping(value="/update", method=RequestMethod.POST)
public String update(@ModelAttribute(value="domainObject") Role domainObject, ModelMap model, BindingResult result){
validator.validate(domainObject, result);
ModelAndView mv = new ModelAndView("role");
if(result.hasErrors()){
model.addAttribute("domainObject", domainObject);
return "roleEdit";
}
service.insertRole(domainObject);
model.addAttribute("messageKey","label.form.item.added");
model.addAttribute("domainObjectList", service.getRoles());
//PROBLEM: the message that the object was updated will be lost, but the URL will be /role and we will show all roles.
return "redirect:/role";
}
@RequestMapping(value="/delete/{id}")
public String delete(@PathVariable Integer id, ModelMap model) {
Role domainObject = service.getRole( id );
if (domainObject == null) {
model.addAttribute("messageKey","label.form.item.notfound");
return showForm(model);
}
service.deleteRole(domainObject);
model.addAttribute("messageKey","label.form.item.deleted");
return showForm(model);
}
@RequestMapping(value="/delete", method=RequestMethod.POST)
public ModelAndView delete(@ModelAttribute(value="domainObject") Role domainObject, BindingResult result){
validator.validate(domainObject, result);
ModelAndView mv = new ModelAndView("role");
if(!result.hasErrors()){
service.deleteRole(domainObject);
mv.addObject("messageKey","label.form.item.deleted");
domainObject = new Role();
mv.addObject("domainObject", domainObject);
}
mv.addObject("domainObjectList", service.getRoles());
return mv;
}
}