我想在 Spring MVC Web App 中实现自定义验证，但我有多个问题，我有两个实体作为
@Entity
public class Foo implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String title;
@ManyToMany(fetch=FetchType.EAGER, cascade = { CascadeType.MERGE })
@JoinTable(name = "foos_bars",
joinColumns = @JoinColumn(name = "foos_id"),
inverseJoinColumns = @JoinColumn(name = "bars_id"))
private List<Bar> bars;
}
@Entity 公共类 Bar 实现 Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String title;
@ManyToMany(mappedBy = "bars", cascade = { CascadeType.MERGE })
private List<Foo> foos;
}
我的自定义验证器是
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
public class FooValidator implements Validator{
@Override
public boolean supports(Class<?> clazz) {
// TODO Auto-generated method stub
return Foo.class.equals(clazz);
}
@Override
public void validate(Object object, Errors errors) {
// TODO Auto-generated method stub
Foo foo = (Foo) object;
if (foo.getTitle().length() < 5 || foo.getTitle().length() > 50) {
errors.rejectValue("title", "foo.title", ErrorConstant.TITLE_ERROR);
}
}
}
1-我想用一些 HTML 和 CSS 显示一些错误消息
ErrorConstant.TITLE_ERROR = "<span class=\"form-help form-help-msg text-red\">"
+ "Valid title is 15-50 chars"
+ "<i class=\"form-help-icon icon icon-error\"></i></span>";
但现在无法在我的控制器中完成工作
@Controller
@RequestMapping(value = "/foo")
public class FooController {
@Autowired
private FooService fooService;
@Autowired
private FooValidator fooValidator;
@InitBinder
public void initBinderOne(WebDataBinder binder) {
binder.addValidators(fooValidator);// custom validator added here
binder.registerCustomEditor(Bar.class,
new PropertyEditorSupport() {
@Override
public void setAsText(String text) {
// replace the dao with your appropriate repository call
Bar bar = fooService.getById(Long
.parseLong(text));
setValue(bar);
}
});
}
@ModelAttribute("bar")
public Bar constructBar() {
return new Bar();
}
@ModelAttribute("foo")
public Foo constructFoo() {
return new Foo();
}
@RequestMapping(value = "/add-foo", method = RequestMethod.GET)
public String showFooForm(Model model) {
model.addAttribute("bars", fooService.getAllBars());
return "add-foo";
}
@RequestMapping(value = "/add-foo", method = RequestMethod.POST)
public String addFooDetail(Model model, @ModelAttribute("foo") @Valid Foo foo, Errors errors) {
if (errors.hasErrors()) {
model.addAttribute("foo", foo);
model.addAttribute("bars", fooService.getAllBars());
return "add-foo";
}else{
fooService.saveFoo(foo);
return "redirect:/";
}
}
}
形式是
<form:form commandName="foo" class="form" id="add-foo">
<form:input path="title"/>
<form:errors path="title"/>
<button>Add</button>
</form:form>
此时我运行应用程序时出现错误
2- java.lang.IllegalStateException：Validator [com.exam.FooValidator@1e2c656] 的目标无效：Bar [title=null]
跟踪是
java.lang.IllegalStateException: Invalid target for Validator [com.exam.FooValidator@1e2c656]: Bar [title=null]
at org.springframework.validation.DataBinder.assertValidators(DataBinder.java:516)
at org.springframework.validation.DataBinder.addValidators(DataBinder.java:527)
at com.eaxm.FooController.initBinderOne(FooController.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.method.annotation.InitBinderDataBinderFactory.initBinder(InitBinderDataBinderFactory.java:62)
at org.springframework.web.bind.support.DefaultDataBinderFactory.createBinder(DefaultDataBinderFactory.java:53)
at org.springframework.web.method.annotation.ModelFactory.updateBindingResult(ModelFactory.java:251)
at org.springframework.web.method.annotation.ModelFactory.updateModel(ModelFactory.java:235)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.getModelAndView(RequestMappingHandlerAdapter.java:879)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:782)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:957)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
我发现应该有@InitBinder以这种方式声明名称的新方法
@InitBinder("foo")
public void initBinderValidator(WebDataBinder binder) {
binder.addValidators(fooValidator);
}
我仍然得到与上述相同的错误。请对这些问题的任何解决方案