Spring MVC security with In-Memory authentication example using Java configuration

STEP 1:- Open Eclipse and Create Dynamic Web Project named SpringSecurityBasicJavaConfig

STEP 2:- Make sure you use Target Runtime as Apache Tomcat 7.0 and Dynamic web module version as 3.0.

STEP 3:- copy below jars to WEB-INF/lib folder.

• commons-logging-1.2.jar
• spring-aop-4.1.4.RELEASE.jar
• spring-beans-4.1.4.RELEASE.jar
• spring-context-4.1.4.RELEASE.jar
• spring-core-4.1.4.RELEASE.jar
• spring-expression-4.1.4.RELEASE.jar
• spring-security-config-4.0.2.RELEASE.jar
• spring-security-core-4.0.2.RELEASE.jar
• spring-security-web-4.0.2.RELEASE.jar
• spring-web-4.1.4.RELEASE.jar
• spring-webmvc-4.1.4.RELEASE.jar

STEP 4:- Create Spring security configuration file.

• Package: com.tutorialsdesk.config
• Filename: SecurityConfig.java

package com.tutorialsdesk.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("user").password("123456").roles("USER");
 auth.inMemoryAuthentication().withUser("admin").password("123456").roles("ADMIN","API");
 auth.inMemoryAuthentication().withUser("apiuser").password("123456").roles("API");
 }

 @Override
 protected void configure(HttpSecurity http) throws Exception {

 http.authorizeRequests()
 .antMatchers("/").permitAll()
 .antMatchers("/home").permitAll()
 .antMatchers("/admin/**").access("hasRole('ROLE_ADMIN')")
 .antMatchers("/api/**").access("hasRole('ROLE_ADMIN') or
hasRole('ROLE_API')")
 .and().formLogin()
 .and().exceptionHandling().accessDeniedPage("/Access_Denied");
 
 }
 
}

STEP 5:- Create a class extends AbstractSecurityWebApplicationInitializer, it will load the springSecurityFilterChain automatically.

• Package: com.tutorialsdesk.config.core
• Filename: SpringSecurityInitializer.java

package com.tutorialsdesk.config.core;

import
org.springframework.security.web.context.AbstractSecurityWebApplicationInitializer;

public class SpringSecurityInitializer extends
 AbstractSecurityWebApplicationInitializer {

}

STEP 6:- Create Spring MVC configuration file. A Config class, define the view’s technology and imports above SecurityConfig.java.

• Package: com.tutorialsdesk.config
• Filename: AppConfig.java

package com.tutorialsdesk.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.tutorialsdesk.controller" })
@Import({ SecurityConfig.class })
public class AppConfig {

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

STEP 7:- Create a Sevlet Initializer class, to load everything.

• Package: com.tutorialsdesk.config.core
• Filename: SpringMvcInitializer.java

package com.tutorialsdesk.config.core;

import
org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

import com.tutorialsdesk.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[] { "/" };
 }

}

STEP 8 :- Create Controller Class.

• Package: com.tutorialsdesk.controller
• Filename: HelloWorldController.java

package com.tutorialsdesk.controller;

import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class HelloWorldController {

 @RequestMapping(value = { "/", "/home" }, method =
RequestMethod.GET)
 public String homePage(ModelMap model) {
 model.addAttribute("greeting", "Hi, Welcome to mysite. ");
 return "welcome";
 }
 
 @RequestMapping(value = "/admin", method = RequestMethod.GET)
 public String adminPage(ModelMap model) {
 model.addAttribute("user", getPrincipal());
 return "admin";
 }
 
 @RequestMapping(value = "/api", method = RequestMethod.GET)
 public String dbaPage(ModelMap model) {
 model.addAttribute("user", getPrincipal());
 return "api";
 }
 
 @RequestMapping(value = "/Access_Denied", method = RequestMethod.GET)
 public String accessDeniedPage(ModelMap model) {
 model.addAttribute("user", getPrincipal());
 return "accessDenied";
 }
 
 private String getPrincipal(){
 String userName = null;
 Object principal =
SecurityContextHolder.getContext().getAuthentication().getPrincipal(); 
 
 if (principal instanceof UserDetails) {
 userName = ((UserDetails)principal).getUsername();
 } else {
 userName = principal.toString();
 
 }
 return userName;
 }
}

STEP 9 :- Create jsp files in /WebContent/WEB-INF/views folder

• Filename: welcome.jsp

<%@ page language="java" contentType="text/html;
charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ 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>HelloWorld page</title>
</head>
<body>
 Greeting : ${greeting}
 This is a welcome page.
 <br/>
 <br/>
 <br/>
<a href="<c:url value="/admin" />">Admin
Page</a> ( Only Admin user can access this )
<br/>
<br/>
<a href="<c:url value="/api" />">API Page</a>
( Admin or API user can access this )

</body>
</html>

• Filename: admin.jsp

<%@ page language="java" contentType="text/html;
charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ 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>HelloWorld Admin page</title>
</head>
<body>
 Dear <strong>${user}</strong>, Welcome to Admin Page.
 
 
<form action="logout" method="post">
 <input type="submit" value="Logout" />
 <input type="hidden" name="${_csrf.parameterName}"
value="${_csrf.token}"/>
</form>
</body>
</html>

• Filename: api.jsp

<%@ page language="java" contentType="text/html;
charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ 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>DBA page</title>
</head>
<body>
 Dear <strong>${user}</strong>, Welcome to API Page.
 
 <form action="logout" method="post">
 <input type="submit" value="Logout" />
 <input type="hidden" name="${_csrf.parameterName}"
value="${_csrf.token}"/>
</form>
</body>
</html>

• Filename: accessDenied.jsp

<%@ page language="java" contentType="text/html;
charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ 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>AccessDenied page</title>
</head>
<body>
 Dear <strong>${user}</strong>, You are not authorized to access this page
 <form action="logout" method="post">
 <input type="submit" value="Logout" />
 <input type="hidden" name="${_csrf.parameterName}"
value="${_csrf.token}"/>
</form>
 
</body>
</html>

STEP 10 :- Run your project enter below URL in your browser

http://localhost:8080/SpringSecurityBasicJavaConfig/

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