spring security 3.x 多页面登录配置入门教程

最近在最shiro的多入口登录，搞了好久，就把spring security拿出来再炒一下，这是我以前在csdn写过的一篇博客。

spring security 是一个权限控制的框架。可以很方便地实现权限的控制，不需要我们手动地写拦截器去对于请求进行拦截，然后对于权限进行判断。这可以大大地减少工作量，并且，spring security提供了很可靠的安全保障。

废话不多说，以下为正文：

1、加入spring security的jar包，我是能过maven配合nexus进行jar包管理的。纯jar包也是可以的，下载相应的jar包添加到WEB-INF下的lib目录下即可。以下为pom.xml加入的依赖（来处官网http://projects.spring.io/spring-security/）：

<dependencies>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-web</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-config</artifactId>
        <version>3.2.3.RELEASE</version>
    </dependency>
</dependencies>

2、在web.xml里面加入spring security的拦截器，当然配置文件也要加载，不过是通过正则表达式一次把spring的配置文件都加载完成的：

	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
			classpath:spring*.xml
		</param-value>
	</context-param>

　　

	<!-- spring security -->
 	<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>

3、配置spring-security.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
    http://www.springframework.org/schema/security
    http://www.springframework.org/schema/security/spring-security-3.2.xsd">  

    <!-- 不需要进行认证的资源，3.0之后才改为这样配置 -->
    <!-- <http security="none" pattern="/**/index" /> -->
    <http security="none" pattern="/**/login" />
    <http security="none" pattern="/**/*.jpg" />
    <http security="none" pattern="/**/*.png" />
    <http security="none" pattern="/**/*.gif" />
    <http security="none" pattern="/**/*.css" />
    <http security="none" pattern="/**/*.js" />  

    <!--设置匹配学生用户url，登录页面和所拥有的权限，以及引用studentAuthManager验证管理 -->
    <http auto-config="true" pattern="/student/**" use-expressions="true" authentication-manager-ref="studentAuthManager">
        <form-login login-processing-url="/student/j_spring_security_check"
            login-page="/student/login" authentication-failure-url="/student/login" default-target-url="/student/index"/>
        <logout logout-success-url="/student/login" logout-url="/student/j_spring_security_logout" />
        <intercept-url pattern="/student/**" access="hasRole('ROLE_STUDENT')" />
    </http>  

    <!--设置匹配管理员用户url，登录页面和所拥有的权限，以及引用adminAuthManager验证管理 -->
    <http auto-config="true" pattern="/admin/**" use-expressions="true" authentication-manager-ref="adminAuthManager">
        <form-login login-processing-url="/admin/j_spring_security_check"
            login-page="/admin/login" authentication-failure-url="/admin/login"  default-target-url="/admin/index"/>
        <logout logout-url="/admin/j_spring_security_logout" logout-success-url="/admin/index" />
        <intercept-url pattern="/admin/**" access="hasRole('ROLE_ADMIN')" />
    </http>  

    <!--前台用户验证管理bean -->
    <authentication-manager id="studentAuthManager">
        <authentication-provider user-service-ref="studentDetailService">
            <password-encoder hash="md5"></password-encoder>
        </authentication-provider>
    </authentication-manager>  

    <!--后台管理用户验证管理bean -->
    <authentication-manager id="adminAuthManager">
        <authentication-provider user-service-ref="adminDetailService">
            <password-encoder hash="md5"></password-encoder>
        </authentication-provider>
    </authentication-manager>
</beans:beans>

　4、重写实现UserDetailsService的接口（由于student的实现方式，跟admin的实现方式是一模一样的，所以此处只列出admin的例子）：

@Service
public class AdminDetailService implements UserDetailsService{  

    @Resource
    private AdminMapper adminMapper;  

    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        Admin admin = adminMapper.selectByUsername(username);
        return admin;
    }  

}

5、在Admin的实体实现UserDetails接口（由于仅为demo所以权限是写死了的，可以从数据库取出），student实现也是实现UserDetails接口，不重复贴代码了。

public class Admin implements UserDetails{
    private static final long serialVersionUID = 1557391641237960295L;  

    private Integer id;  

    private String username;  

    private String password;  

    public Integer getId() {
        return id;
    }  

    public void setId(Integer id) {
        this.id = id;
    }  

    //此部分的权限应该由数据库取出，此处不作取出操作
    public Collection<? extends GrantedAuthority> getAuthorities() {
        List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();
        authorities.add(new SimpleGrantedAuthority("ROLE_ADMIN"));
        return authorities;
    }  

    public void setPassword(String password){
        this.password = password;
    }  

    public void setUsername(String username){
        this.username = password;
    }  

    public String getPassword() {
        return password;
    }  

    public String getUsername() {
        return username;
    }  

    public boolean isAccountNonExpired() {
        return true;
    }  

    public boolean isAccountNonLocked() {
        return true;
    }  

    public boolean isCredentialsNonExpired() {
        return true;
    }  

    public boolean isEnabled() {
        return true;
    }
}

6、如果不写页面的话，spring security会使用它默认的页面，十分的丑陋，不过所幸可以自己写，以下为自己写的页面（也十分地丑陋）：

<body>
    <form action="j_spring_security_check" method="post">
    username:<input type="text" name="j_username"/><br/>
    password:<input type="password" name="j_password"/><br/>
    Remember Me:<input name="_spring_security_remember_me" type="checkbox" value="true"/><br/>
    <input type="submit" value="提交"/>
    </form>
</body>

7、访问，登录，大功告成，由于此部分的代码由项目代码改的，所以没有demo不好意思！！！（有机会一定补上= =||，估计是补不上了）