スプリング4を使用してログアウトできないMVC

Question

私は、アノテーションベースのプロジェクトでspring 4 MVCを使用しました。 ログインに成功しましたが、ログアウトできません。

の下に設定、初期化子、コントローラのクラスを投稿しました。ログインページとウェルカムページに加えて、私は正常にログアウトするためにコードにどのような変更が必要かを教えてください。

私は現在、ログアウト時に以下のエラーを取得しています

Feb 06, 2017 2:36:03 PM org.springframework.web.servlet.PageNotFound noHandlerFound 
WARNING: No mapping found for HTTP request with URI [/Student_Login/%3Cc:url%20value='/login'%20/%3E] in DispatcherServlet with name 'dispatcher' 

AppConfig_login

@Configuration 
    @EnableWebMvc 
    @ComponentScan(basePackages = "com.student.login") 
    public class AppConfig_login { 

@Bean 
public ViewResolver viewResolver() { 
    InternalResourceViewResolver viewResolver = new InternalResourceViewResolver(); 
    viewResolver.setViewClass(JstlView.class); 
    viewResolver.setPrefix("/WEB-INF/views/"); 
    viewResolver.setSuffix(".jsp"); 

    return viewResolver; 
} 

@Bean 
public MessageSource messageSource() { 
    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource(); 
    messageSource.setBasename("message"); 
    return messageSource; 
} 

}

AppInitializer_login

public class AppInitializer_login extends  AbstractAnnotationConfigDispatcherServletInitializer { 

@Override 
protected Class<?>[] getRootConfigClasses() { 
    return new Class[] { AppConfig_login.class }; 
} 

@Override 

protected Class<?>[] getServletConfigClasses() { 
    // TODO Auto-generated method stub 
    return null;} 

@Override 
protected String[] getServletMappings() { 
    return new String[] { "/" }; 
}} 

のAppController

package com.student.login.controller; 

    import java.util.List; 
    import java.util.Locale; 



@Controller 
@RequestMapping("/") 
public class AppController_login { 
    @Autowired 
    StudentService service; 

    @Autowired 
    MessageSource messageSource; 
    /* 
    * This method will list all existing employees. 
    */ 
    @RequestMapping(value = {"/"}, method = RequestMethod.GET) 
    public String listStudents(ModelMap model) { 
     //List<Student> students = service.findAllStudents(); 
     //model.addAttribute("students", students); 
     Student student = new Student(); 
     model.addAttribute("student", student); 
     return "login"; 
    } 

    @RequestMapping(value = { "/" }, method = RequestMethod.POST) 
    public String checkCredentials(@Valid Student student, BindingResult result, 
      ModelMap model) { 
     if (result.hasErrors()) { 
      return "login"; 
     } 
     System.out.println(student.getRoll_no()); 
     System.out.println(student.getPassword()); 

     /* 
     * Preferred way to achieve uniqueness of field [ssn] should be implementing custom @Unique annotation 
     * and applying it on field [ssn] of Model class [Employee]. 
     * 
     * Below mentioned peace of code [if block] is to demonstrate that you can fill custom errors outside the validation 
     * framework as well while still using internationalized messages. 
     * 
     */ 
     if(service.isCredentialValid(student.getRoll_no(),student.getPassword())){ 
      FieldError login_Error =new FieldError("student","password",messageSource.getMessage("non.unique.credentials", new String[]{student.getRoll_no()}, Locale.getDefault())); 
      result.addError(login_Error); 
      return "login"; 
     } 


     //service.saveStudent(student); 
     model.addAttribute("welcome", "Welcome Student " + student.getName() + " registered successfully"); 
     return "welcome_student"; 
    } 

    @RequestMapping(value = { "/login" }, method = RequestMethod.GET) 
    public String logoutPage(ModelMap model) { 
     Student student = new Student(); 
     model.addAttribute("student", student); 
     //model.addAttribute("edit", false); 
     return "login"; 
    } 




    /* 
    * This method will provide the medium to add a new employee. 
    */ 
    @RequestMapping(value = { "/registration" }, method = RequestMethod.GET) 
    public String newStudent(ModelMap model) { 
     Student student = new Student(); 
     model.addAttribute("student", student); 
     model.addAttribute("edit", false); 
     return "registration"; 
    } 
    /* 
    * This method will be called on form submission, handling POST request for 
    * saving employee in database. It also validates the user input 
    */ 
    @RequestMapping(value = { "/registration" }, method = RequestMethod.POST) 
    public String saveEmployee(@Valid Student student, BindingResult result, 
      ModelMap model) { 
     if (result.hasErrors()) { 
      return "registration"; 
     } 

     if(!service.isStudentRollNoUnique(student.getRoll_no())){ 
      FieldError roll_no_Error =new FieldError("student","roll_no",messageSource.getMessage("non.unique.roll_no", new String[]{student.getRoll_no()}, Locale.getDefault())); 
      result.addError(roll_no_Error); 
      return "registration"; 
     } 
     service.saveStudent(student); 
     model.addAttribute("success", "Student " + student.getName() + " registered successfully"); 
     return "login_success"; 

     }} 

login.jspを

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%> 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 

<html> 

<head> 
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
    <title>Student Registration Form</title> 

<style> 

    .error { 
     color: #ff0000; 
    } 
</style> 

</head> 

<body> 

    <h2>Login Form</h2> 

    <form:form method="POST" modelAttribute="student"> 
    <!-- <form:input type="hidden" path="id" id="id"/>--> 
     <table> 
      <tr> 
       <td><label for="roll_no">Roll No:</label> </td> 
       <td><form:input path="roll_no" id="roll_no"/></td> 
       <td><form:errors path="roll_no" cssClass="error"/></td> 
      </tr> 
      <tr> 
       <td><label for="password">Password:</label> </td> 
       <td><form:input path="password" id="password"/></td> 
       <td><form:errors path="password" cssClass="error"/></td> 
      </tr> 
      <tr> 
       <td colspan="3"> 

     <input type="submit" value="Submit"/> 
       </td> 
      </tr> 
     </table> 
    </form:form> 
    <br/> 
    <br/> 
    Go back to <a href="<c:url value='/registration' />">Registration</a> 
</body> 
</html> 

welcome_student

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
    pageEncoding="ISO-8859-1"%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
<title>Insert title here</title> 
</head> 
<body> 
hello user 



    <a href="<c:url value='/login' />">Logout</a> 


</body> 
</html> 

Answer 1

だから私は最終的に、問題は、私は以下の行を含めるのを忘れて、私のJSP welcome_student

であったことを考え出し

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>