我希望在MultiActionControllers上实现验证，
我有pojo，pojo验证器，控制器和jsp，
当我在用户名和密码字段中键入一些文本时没有任何反应，但是当一个字段为空时，显示并且错误显示带有错误文本的jsp，我尝试使用commandName和modelAttribute，代码如下：
我得到的错误就是这个：
org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [dispatcher] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.beans.NotReadablePropertyException: Invalid property 'USERNAME' of bean class [me.example.to.Login]: Bean property 'USERNAME' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?] with root cause
org.springframework.beans.NotReadablePropertyException: Invalid property 'USERNAME' of bean class [me.example.to.Login]: Bean property 'USERNAME' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
登录POJO
public class Login
{
private String username;
private String password;
public Login()
{}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
登录验证员
public class AdmLoginValidator implements Validator
{
@Override
public boolean supports( Class<?> clazz )
{
return Login.class.isAssignableFrom( clazz );
}//
@Override
public void validate( Object target, Errors errors )
{
Login bean = (Login) target;
//code to validate the form salary field
if (bean.getUsername().equals(""))
errors.rejectValue("USERNAME", "error.salary.exceed.limit", "Salary can't be greater than 2000000");
}//
} //类
控制器类：
public class AdmLoginController extends BaseController
{
public ModelAndView login(HttpServletRequest request, HttpServletResponse response)
throws Exception
{
return new ModelAndView("/jspadmin/admlogin","login",new Login() );
}//
public ModelAndView auth(
HttpServletRequest request,
HttpServletResponse response,
Login admLogin)
throws Exception
{
ServletRequestDataBinder binder = new ServletRequestDataBinder( admLogin, "login" );
System.err.println( "mostrando login" );
System.err.println( admLogin.getUsername() + " - " + admLogin.getPassword() );
//set the validator
binder.setValidator( new AdmLoginValidator() );
binder.validate();
if( binder.getBindingResult().hasErrors()
&& binder.getBindingResult().getErrorCount() > 0 )
{
BindingResult br = binder.getBindingResult();
return new ModelAndView(
"/jspadmin/admlogin",
"/jspadmin/admlogin",
admLogin ).addAllObjects( br.getModel() );
}//
return new ModelAndView( "/jspadmin/admdashboard" );
}//
}//class
JSP（仅限重要代码）
<%@page import="org.springframework.validation.Errors"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
...
<form:form method="post" action="/admin/auth.html" modelAttribute="login" >
<!-- <input type="text" name="username" placeholder="Username">
<input type="password" name="password" placeholder="Password">-->
<form:input path="username" />
<form:input path="password" />
<input type="submit" name="login" class="login loginmodal-submit" value="Login">
</form:form>