我不明白我做错了什么。我有一个控制器:
@Controller
@RequestMapping(value = "/index.htm")
public class LoginController {
@Autowired
private AccountService accountService;
@RequestMapping(method = RequestMethod.GET)
public String showForm(Map model) {
model.put("index", new LoginForm());
return "index";
}
@ModelAttribute("index")
public LoginForm getLoginForm() {
return new LoginForm();
}
@RequestMapping(method = RequestMethod.POST)
public String processForm(LoginForm loginForm, BindingResult result,
Map model) {
if (result.hasErrors()) {
HashMap<String, String> errors = new HashMap<String, String>();
for (FieldError error : result.getFieldErrors()) {
errors.put(error.getField(), error.getDefaultMessage());
}
model.put("errors", errors);
return "index";
}
List<Account> accounts = accountService.findAll();
loginForm = (LoginForm) model.get("loginForm");
model.put("index", loginForm);
return "loginsuccess";
}
}
和 Spring html 形式:
<form:form action="index.htm" commandName="index">
<table cellspacing="10">
<tr>
<td>
<form:label path="username">
<spring:message code="main.login.username"/>
</form:label>
</td>
<td>
<form:input path="username" cssClass="textField"/>
</td>
</tr>
<tr>
<td>
<form:label path="password">
<spring:message code="main.login.password"/>
</form:label>
</td>
<td>
<form:password path="password" cssClass="textField"/>
</td>
</tr>
<tr>
<td>
<input type="submit" class="button" value="Login"/>
</td>
</tr>
</table>
</form:form>
当我尝试访问网址时:http://localhost:8080/webclient/index.htm
我不断收到此异常:
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'index' available as request attribute
我的控制器出了什么问题,为什么我总是收到这样的异常?
我会进行以下更改。首先,您的GET
方法应如下所示:
@RequestMapping(method = RequestMethod.GET)
public String showForm(@ModelAttribute("index") LoginForm loginForm) {
return "index";
}
使用 @ModelAttribute
注释将自动将"index"放入请求的模型中。
您的POST
方法声明应如下所示:
@RequestMapping(method = RequestMethod.POST)
public String processForm(@ModelAttribute("index") LoginForm loginForm,
BindingResult result, Map model) {
最后,也可能是真正的问题,将控制器类的@RequestMapping
注释更改为:
@RequestMapping(value = "/index")
您拥有的".htm"是多余的。您已经配置了 web.xml 和 Spring 配置来响应".htm"请求。