Spring Security 0: Set up

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Dependencies

pom.xml:

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<!-- There may be problems or bugs because of the incompatibility 
     between springframework and springsecurity. Here provided an
     compatible solution of versions -->
  <properties>
    <springframework.version>5.0.2.RELEASE</springframework.version>
    <springsecurity.version>5.0.0.RELEASE</springsecurity.version>

    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>

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

    <!-- Spring Security -->

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

    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
      <version>${springsecurity.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-taglibs</artifactId>
      <version>${springsecurity.version}</version>
    </dependency>
    <!-- Servlet, JSP and JSTL support -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.1</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

  </dependencies>

Configuration

Here we are using pure Java to do the configuration(no xml).

DemoAppConfig:

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@Configuration
@EnableWebMvc
@ComponentScan(basePackages = "com.xliu.springsecurity.demo")
public class DemoAppConfig {

//    define a bean for ViewResolver
    @Bean
    public ViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();

        viewResolver.setPrefix("/WEB-INF/view/");
        viewResolver.setSuffix(".jsp");

        return viewResolver;
    }
}

MySpringMvcDispatcherServletInitializer:

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public class MySpringMvcDispatcherServeletInitializer 
            extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
//        No root config classes for our project, only servlet config classes
    }

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

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

DemoSecurityConfig:

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@Configuration
@EnableWebSecurity
public class DemoSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
//        add our users for in memory authentication
        UserBuilder users = User.withDefaultPasswordEncoder();
//  users are loaded in memory, this is just for academic purpose, usually we will use JDBC
        auth.inMemoryAuthentication()
                .withUser(users.username("john").password("test123").roles("EMPLOYEE"))
                .withUser(users.username("mary").password("test123").roles("EMPLOYEE","MANAGER"))
                .withUser(users.username("susan").password("test123").roles("EMPLOYEE","ADMIN"));
    }

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

        http.authorizeRequests()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                // Spring Security has its own default loging page, but here we refer to a customized page
                .loginPage("/showMyLoginPage")
                // authendicateTheUser is done by Spring Security automatically
                .loginProcessingUrl("/authenticateTheUser")
                .permitAll()
                .and()
                .logout()
                .permitAll();
    }
}