（7）SSM的SpringSecurity權限管理（認證與授權）

1.導入jar包
項目使用SSM框架，所以導入jar包，只需要在pom.xml文件下寫入相應的依賴項，Maven即可自動下載。
(1)添加版本號：

    <spring.security.version>5.0.1.RELEASE</spring.security.version>

(2)添加依賴項：

       <!--Security-->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>${spring.security.version}</version>
        </dependency>

2.添加過濾器
在webapp目錄下的web.xml文件中添加過濾器：

  <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
spring-security.xml代碼：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:security="http://www.springframework.org/schema/security"
       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.xsd
    http://www.springframework.org/schema/security
    http://www.springframework.org/schema/security/spring-security.xsd">
 
    <security:global-method-security pre-post-annotations="enabled" jsr250-annotations="enabled" secured-annotations="enabled"></security:global-method-security>
 
    <!-- 配置不攔截的資源 -->
    <security:http pattern="/login.jsp" security="none"/>
    <security:http pattern="/failer.jsp" security="none"/>
    <security:http pattern="/css/**" security="none"/>
    <security:http pattern="/img/**" security="none"/>
    <security:http pattern="/plugins/**" security="none"/>
 
    <!--
    	配置具體的規則
    	auto-config="true"	不用自己編寫登錄的頁面，框架提供默認登錄頁面
    	use-expressions="false"	是否使用SPEL表達式（沒學習過）
    -->
    <!--FIXME 以下是重點-->
 
    <security:http auto-config="true" use-expressions="true">
        <!-- 配置具體的攔截的規則 pattern="請求路徑的規則" access="訪問系統的人，必須有ROLE_USER的角色" -->
        <security:intercept-url pattern="/**" access="hasAnyRole('ROLE_USER','ROLE_ADMIN')"/>
 
        <security:form-login login-page="/login.jsp"
                             login-processing-url="/login.do"
                            default-target-url="/index.jsp"
                            authentication-failure-url="/failer.jsp"
                            authentication-success-forward-url="/pages/main.jsp"/>
 
        <!-- 關閉跨域請求 -->
        <security:csrf disabled="true"/>
 
        <!--退出並跳轉到首頁-->
        <security:logout invalidate-session="true" logout-url="/logout.do" logout-success-url="/login.jsp"></security:logout>
 
    </security:http>
 
    <!-- 切換成數據庫中的用戶名和密碼 -->
    <security:authentication-manager>
        <security:authentication-provider user-service-ref="userService">
            <!-- 配置加密的方式
            <security:password-encoder ref="passwordEncoder"/>　-->
        </security:authentication-provider>
    </security:authentication-manager>
 
    <!-- 配置加密類 -->
    <!--<bean id="passwordEncoder" class="org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder"/>-->
    <!-- <bean id="webexpressionHandler" class="org.springframework.security.web.access.expression.DefaultWebSecurityExpressionHandler" />-->
    <!-- 提供了入門的方式，在內存中存入用戶名和密碼
    <security:authentication-manager>
    	<security:authentication-provider>
    		<security:user-service>
    			<security:user name="admin" password="{noop}admin" authorities="ROLE_USER"/>
    		</security:user-service>
    	</security:authentication-provider>
    </security:authentication-manager>
    -->
 
</beans>

同時在web.xml下配置加載類路徑的配置文件

  <!-- 配置加載類路徑的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext.xml,classpath*:spring-security.xml</param-value>
  </context-param>

4.UserService.java接口繼承UserDetailsService

public interface IUserInfoService extends UserDetailsService

5.修改數據庫表
6.添加Role bean

package com.zhongruan.bean;

public class Role {
    private int id;
    private String roleName;
    private String roleDesc;

    public int getId() {
        return id;
    }

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

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public String getRoleDesc() {
        return roleDesc;
    }

    public void setRoleDesc(String roleDesc) {
        this.roleDesc = roleDesc;
    }

    @Override
    public String toString() {
        return "Role{" +
                "id=" + id +
                ", roleName='" + roleName + '\'' +
                ", roleDesc='" + roleDesc + '\'' +
                '}';
    }
}

7.添加IRoleDao接口，並新建roleMapper.xml
IRoleDao.java

public interface IRoleDao {
    List<Role> findRoleByUserId(int userId);
}

roleMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.zhongruan.dao.IRoleDao" >
    <select id="findRoleByUserId" parameterType="int" resultType="com.zhongruan.bean.Role">
        select * from role where id in (select roleId from user_role where userId=#{userId})
    </select>

</mapper>

8.實現用戶身份驗證,改寫UserInfoServiceImpl.java

@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
    UserInfo userInfo =userInfoDao.findUserByName(username);
    List<Role>roles=roleDao.findRoleByUserId(userInfo.getId());
    User user=new User(userInfo.getName(),"{noop}"+userInfo.getPassword(),getAuthority(roles));
    return user;
}

private Collection<? extends GrantedAuthority> getAuthority(List<Role> roles) {
    List<SimpleGrantedAuthority>list=new ArrayList<>();
    for(Role role:roles){
        list.add(new SimpleGrantedAuthority("ROLE_"+role.getRoleName()));

    }
    return list;
}

9.修改login.jsp
修改響應路徑即可