Recently I wrote about getting started with Spring Security. In that, I used XML configurations for spring security. As a Java developer, I normally prefer Java configuration with Spring than XML. So here is how we can move from XML configuration to Java configuration.

Firstly I tell my web.xml that I want to use Java file based configuration and provide configuration class.

<?xml version="1.0" encoding="ISO-8859-1" ?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <context-param>
        <param-name>contextClass</param-name>
        <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
    </context-param>
    <context-param>
        <param-name>spring.profiles.active</param-name>
        <param-value>javaee</param-value>
    </context-param>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>com.myapp.config.MyConfig</param-value>
    </context-param>


    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <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>
        <dispatcher>ERROR</dispatcher>
        <dispatcher>REQUEST</dispatcher>
    </filter-mapping>

    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextClass</param-name>
            <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
        </init-param>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>com.myapp.config.MyConfig</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/service/*</url-pattern>
    </servlet-mapping>

</web-app>

Here is a simple contoller path which I need to secure

package com.myapp.test;

import java.io.IOException;

import javax.servlet.ServletException;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/sample")
public class SampleService {
	@RequestMapping(method = RequestMethod.GET, value = "/hello")
	public ModelAndView LepService(@PathVariable("id") String id)
			throws ServletException, IOException {

		ModelAndView mv = new ModelAndView("hello");
		// Do something here
		return mv;
	}
}

As you can see this simply redirects to hello view (hello.jsp).

And here the configuration file.

@Configuration
@EnableWebMvc
@EnableWebSecurity
@ComponentScan(basePackages = "com.myapp.test")
public class MyConfig extends WebSecurityConfigurerAdapter {

	@Bean
	public UrlBasedViewResolver urlBasedViewResolver() {
		UrlBasedViewResolver res = new InternalResourceViewResolver();
		res.setViewClass(JstlView.class);
		res.setPrefix("/WEB-INF/");
		res.setSuffix(".jsp");

		return res;
	}

	@Override
	public void configure(WebSecurity web) throws Exception {
		web.ignoring().antMatchers("/resources/**");
	}

	@Autowired
	public void configureGlobal(AuthenticationManagerBuilder auth)
			throws Exception {
		auth.inMemoryAuthentication().withUser("user").password("password")
				.roles("USER");
	}

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http.authorizeRequests().antMatchers("/").permitAll()
				.antMatchers("/sample/**").hasRole("USER").anyRequest().authenticated()
				.and().formLogin();
	}
}