Spring Security Hello World Anno

Technologies used :

• Spring 3.2.8.RELEASE
• Spring Security 3.2.3.RELEASE
• Eclipse 4.2
• JDK 1.6
• Maven 3
• Tomcat 7 (Servlet 3.x)

Few Notes
This tutorial is using WebApplicationInitializer to load the Spring Context Loader automatically, which is supported in Servlet 3.x container only, for example, Tomcat 7 and Jetty 8.
Since we are using WebApplicationInitializer, the web.xml file is NOT required.

Spring Security annotations are supported in older Servlet 2.x container, for example, Tomcat 6. If you use the classic XML file to load the Spring context, this tutorial is still able to deploy on Servlet 2.x container, for example, Tomcat 6

1. Project Demo

2. Directory Structure

Review the final directory structure of this tutorial.

spring-security-helloworld-annotation-directory

3. Spring Security Dependencies

To use Spring security, you need spring-security-web and spring-security-config.

pom.xml

<properties> 
    <jdk.version>1.6</jdk.version> 
    <spring.version>3.2.8.RELEASE</spring.version>  
    <spring.security.version>3.2.3.RELEASE</spring.security.version> 
    <jstl.version>1.2</jstl.version> 
</properties> 

<dependencies> 
    <!-- Spring 3 dependencies --> 
    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-core</artifactId> 
        <version>${spring.version}</version> 
    </dependency> 

    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-web</artifactId> 
        <version>${spring.version}</version> 
     </dependency> 

    <dependency> 
        <groupId>org.springframework</groupId> 
        <artifactId>spring-webmvc</artifactId> 
        <version>${spring.version}</version> 
    </dependency> 

    <!-- Spring Security --> 
    <dependency> 
        <groupId>org.springframework.security</groupId> 
        <artifactId>spring-security-web</artifactId> 
        <version>${spring.security.version}</version> 
    </dependency> 
    <dependency> 
        <groupId>org.springframework.security</groupId> 
        <artifactId>spring-security-config</artifactId> 
        <version>${spring.security.version}</version> 
    </dependency> 
    
    <!-- jstl for jsp page --> 
    <dependency> 
        <groupId>jstl</groupId> 
        <artifactId>jstl</artifactId> 
        <version>${jstl.version}</version> 
    </dependency> 
</dependencies>

4. Spring MVC Web Application

A simple controller :

• If URL =/welcome or /, return hello page.
• If URL =/admin, return admin page.
• If URL =/dba, return admin page.

Later, we will secure the /admin and /dba URLs.

HelloController.java

package com.mkyong.web.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController { 
    @RequestMapping(value = { "/", "/welcome**" }, method = RequestMethod.GET) 
    public ModelAndView welcomePage() { 
        ModelAndView model = new ModelAndView(); 
        model.addObject("title", "Spring Security Hello World"); 
        model.addObject("message", "This is welcome page!"); 
        model.setViewName("hello"); 
        return model; 
    } 

    @RequestMapping(value = "/admin**", method = RequestMethod.GET) 
    public ModelAndView adminPage() { 
        ModelAndView model = new ModelAndView(); 
        model.addObject("title", "Spring Security Hello World"); 
        model.addObject("message", "This is protected page - Admin Page!");   
        model.setViewName("admin"); 
        return model; 
    } 

    @RequestMapping(value = "/dba**", method = RequestMethod.GET) 
    public ModelAndView dbaPage() { 
        ModelAndView model = new ModelAndView(); 
        model.addObject("title", "Spring Security Hello World"); 
        model.addObject("message", "This is protected page - Database Page!");  
        model.setViewName("admin"); 
        return model; 
    }
}

Two JSP pages.

hello.jsp

<%@page session="false"%>
<html>
    <body> 
         <h1>Title : ${title}</h1> 
         <h1>Message : ${message}</h1>
     </body>
</html>

admin.jsp

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@page session="true"%>
<html>
    <body> 
        <h1>Title : ${title}</h1> 
        <h1>Message : ${message}</h1> 
        <c:if test="${pageContext.request.userPrincipal.name != null}"> 
            <h2>Welcome : ${pageContext.request.userPrincipal.name} | <a href="<c:url value="/logout" />" > Logout</a></h2> 
        </c:if>
    </body>
</html>

5. Spring Security Configuration

5.1 Create a Spring Security configuration file, and annotated with @EnableWebSecurity

SecurityConfig.java

package com.mkyong.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter { 
    @Autowired 
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {   
        auth.inMemoryAuthentication().withUser("mkyong").password("123456").roles("USER");  
        auth.inMemoryAuthentication().withUser("admin").password("123456").roles("ADMIN");  
        auth.inMemoryAuthentication().withUser("dba").password("123456").roles("DBA"); 
    } 

    @Override 
    protected void configure(HttpSecurity http) throws Exception { 
        http.authorizeRequests() .antMatchers("/admin/**").access("hasRole('ROLE_ADMIN')")  
                                               .antMatchers("/dba/**").access("hasRole('ROLE_ADMIN') or hasRole('ROLE_DBA')") .
                                               and().formLogin(); 
    }
}

The equivalent of the Spring Security xml file :

<http auto-config="true"> 
    <intercept-url pattern="/admin**" access="ROLE_ADMIN" /> 
    <intercept-url pattern="/dba**" access="ROLE_ADMIN,ROLE_DBA" /> 
</http> 

<authentication-manager> 
    <authentication-provider> 
        <user-service> 
            <user name="mkyong" password="123456" authorities="ROLE_USER" /> 
           <user name="admin" password="123456" authorities="ROLE_ADMIN" /> 
          <user name="dba" password="123456" authorities="ROLE_DBA" />
        </user-service> 
    </authentication-provider> 
</authentication-manager>

5.2 Create a class extends AbstractSecurityWebApplicationInitializer, it will load the springSecurityFilterChain automatically.

SpringSecurityInitializer.java

package com.mkyong.config.core;
import org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;
public class SpringSecurityInitializer extends AbstractSecurityWebApplicationInitializer { 
    //do nothing
}

The equivalent of Spring Security in web.xmlfile :

<filter> 
    <filter-name>springSecurityFilterChain</filter-name> 
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy </filter-class> 
</filter> 
<filter-mapping> 
    <filter-name>springSecurityFilterChain</filter-name> 
    <url-pattern>/*</url-pattern> 
</filter-mapping>

6. Spring MVC Configuration

6.1 A Config class, define the view’s technology and imports above SecurityConfig.java

.

AppConfig.java

package com.mkyong.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@EnableWebMvc
@Configuration
@ComponentScan({ "com.mkyong.web.*" })
@Import({ SecurityConfig.class })
public class AppConfig { 
    @Bean 
    public InternalResourceViewResolver viewResolver() { 
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();    
        viewResolver.setViewClass(JstlView.class); viewResolver.setPrefix("/WEB-INF/pages/");  
        viewResolver.setSuffix(".jsp"); 
        return viewResolver; 
    } 
}

The equivalent of the Spring XML file :

<context:component-scan base-package="com.mkyong.web.*" /> 
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
    <property name="prefix"> 
        <value>/WEB-INF/pages/</value> 
    </property> 
    <property name="suffix"> 
        <value>.jsp</value> 
    </property> 
</bean>

6.2 Create aInitializer class, to load everything.

SpringMvcInitializer.java

package com.mkyong.config.core;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import com.mkyong.config.AppConfig;
public class SpringMvcInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {   
    @Override 
     protected Class<?>[] getRootConfigClasses() { 
         return new Class[] { AppConfig.class }; 
     } 
    
     @Override 
     protected Class<?>[] getServletConfigClasses() { 
         return null; 
     } 

     @Override 
      protected String[] getServletMappings() { 
           return new String[] { "/" }; 
      } 
}
```
Done.
> **Note** In Servlet 3.x container environment + Spring container will detect and loads theInitializer classes automatically.

##7. Demo

7.1. Welcome Page – http://localhost:8080/spring-security-helloworld-annotation/welcome
![spring-security-helloworld-annotation-welcome](https://img.haomeiwen.com/i722827/6a1c17599ab19d12.png?imageMogr2/auto-orient/strip|imageView2/2/w/1240)
7.2 Try to access`/admin` page, Spring Security will intercept the request and redirect to `/login`
, and a default login form is displayed.
![spring-security-helloworld-annotation-login](https://img.haomeiwen.com/i722827/8a3080a9da3d1d2a.png?imageMogr2/auto-orient/strip|imageView2/2/w/1240)
7.3. If username and password is incorrect, error messages will be displayed, and Spring will redirect to this URL `/login?error`.
![spring-security-helloworld-annotation-login-error](https://img.haomeiwen.com/i722827/96cfe6690c426a0b.png?imageMogr2/auto-orient/strip|imageView2/2/w/1240)
7.4. If username and password is correct, Spring will redirect the request to the original requested URL and display the page.
![spring-security-helloworld-annotation-admin](https://img.haomeiwen.com/i722827/6e18350c03b497de.png?imageMogr2/auto-orient/strip|imageView2/2/w/1240)
7.5. For unauthorized user, Spring will display the 403 access denied page. For example, user “mkyong” or “dba” try to access the `/admin` URL.
![spring-security-helloworld-annotation-403](https://img.haomeiwen.com/i722827/b93d6cb7cf992cb7.png?imageMogr2/auto-orient/strip|imageView2/2/w/1240)