按了 here 後,會出現登入頁,如下:
輸入帳號密碼,為求簡單,程式裡先 hard code 為 user / password,輸入後按【Sign In】登入就出現 Hello 畫面,如下:
現在開始寫程式 ...
- 程式結構
 
如上,在 eclipse 中以「Spring Starter Project」建立一個 spring boot 檔案,會得到如上的檔案結構,當然,裡面的程式是下面要開始慢慢加進去的。
- build.gradle
 
buildscript {
    ext {
        springBootVersion = '2.0.3.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
group = 'idv.steven.mysecurity'
version = '0.0.1'
sourceCompatibility = 1.8
repositories {
    mavenCentral()
}
dependencies {
    compile("org.springframework.boot:spring-boot-starter-thymeleaf")
    compile('org.springframework.boot:spring-boot-starter-security')
    compile('org.springframework.boot:spring-boot-starter-web')
    compileOnly('org.projectlombok:lombok')
 
    testCompile("junit:junit")
    testCompile('org.springframework.boot:spring-boot-starter-test')
    testCompile('org.springframework.security:spring-security-test')
}
- home.html
 
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <title>Spring Security Example</title>
    </head>
    <body>
        <h1>Welcome!</h1>
        <p>Click <a th:href="@{/hello}">here</a> to see a greeting.</p>
    </body>
</html>
- login.html
 
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
    <head>
        <title>Spring Security Example </title>
    </head>
    <body>
        <div th:if="${param.error}">
            Invalid username and password.
        </div>
        <div th:if="${param.logout}">
            You have been logged out.
        </div>
        <form th:action="@{/login}" method="post">
            <div><label> User Name : <input type="text" name="username"/> </label></div>
            <div><label> Password: <input type="password" name="password"/> </label></div>
            <div><input type="submit" value="Sign In"/></div>
        </form>
    </body>
</html>
- hello.html
 
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"> <head> <title>Hello World!</title> </head> <body> <h1 th:inline="text">Hello [[${#httpServletRequest.remoteUser}]]!</h1> <form th:action="@{/logout}" method="post"> <input type="submit" value="Sign Out"/> </form> </body> </html>
- MvcConfig.java
 
package idv.steven.mysecurity;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MvcConfig implements WebMvcConfigurer {
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/home").setViewName("home");
        registry.addViewController("/").setViewName("home");
        registry.addViewController("/hello").setViewName("hello");
        registry.addViewController("/login").setViewName("login");
    }
}
- WebSecurityConfig.java
 
package idv.steven.mysecurity;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/", "/home").permitAll()
                .anyRequest().authenticated()
                .and()
            .formLogin()
                .loginPage("/login")
                .permitAll()
                .and()
            .logout()
                .permitAll();
    }
    @Bean
    @Override
    public UserDetailsService userDetailsService() {
        UserDetails user =
             User.withDefaultPasswordEncoder()
                .username("user")
                .password("password")
                .roles("USER")
                .build();
        return new InMemoryUserDetailsManager(user);
    }
}
spring security 在驗證帳密時,會由 spring container 中取得 UserDetailService 的 object 來驗證,上面的程式產生一個 UserDetailsService 的 Bean,把帳密放在記憶體裡,只有一個使用者,名稱為 user,密碼為 password,角色是 USER。一般的系統不會把帳密放記憶體,通常是放在 LDAP 或資料庫,下一篇會說明當放在資料庫時怎麼做。
- MySecurityApplication.java
 
package idv.steven.mysecurity;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MySecurityApplication {
    public static void main(String[] args) {
        SpringApplication.run(MySecurityApplication.class, args);
    }
}




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