自定义Realm实战

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一 新建pom

<dependencies>
    <dependency>
        <groupId>org.apache.shiro</groupId>
        <artifactId>shiro-core</artifactId>
        <version>1.4.0</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>RELEASE</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.45</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.20</version>
    </dependency>
</dependencies>

二 新建自定义Realm类

package com.liuyanzhao.shiro.realm;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;

import java.util.HashSet;
import java.util.Set;

public class CustomRealm extends AuthorizingRealm{
    /**
     * 授权
     * @param principalCollection
     * @return
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection
                                                               principalCollection) {

        String username = (String) principalCollection.getPrimaryPrincipal();
        //从数据库或者缓存中获取角色数据
        Set<String> roles = getRolesByUsername(username);

        Set<String> permissions = getPermissionsByUsername(username);
        SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
        simpleAuthorizationInfo.setStringPermissions(permissions);
        simpleAuthorizationInfo.setRoles(roles);
        return simpleAuthorizationInfo;
    }
    private Set<String> getPermissionsByUsername(String username) {

        Set<String> sets = new HashSet<String>();
        sets.add("user:delete");
        sets.add("user:add");
        return sets;
    }


    private Set<String> getRolesByUsername(String username) {
        Set<String> sets = new HashSet<String>();
        sets.add("admin");
        sets.add("user");
        return sets;
    }

    /**
     * 认证
     * @param authenticationToken
     * @return
     * @throws AuthenticationException
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken
                                                                 authenticationToken) throws AuthenticationException {
        //1、从主体传过来的认证信息中，获得用户名
        String username = (String) authenticationToken.getPrincipal();

        //2、通过用户名到数据库获取凭证
        String password = getPasswordByUsername(username);
        if(password == null) {
            return null;
        }
        //SimpleAuthenticationInfo authorizationInfo = new SimpleAuthenticationInfo("Tom",password,"customRealm");
        SimpleAuthenticationInfo authorizationInfo = new SimpleAuthenticationInfo(username,password,"customRealm");
        return authorizationInfo;
    }

    /**
     * 模拟数据库获得凭证
     * @param username
     * @return
     */
    private String getPasswordByUsername(String username) {
        return "1234567";
    }
}

三 测试自定义Realm类

package com.liuyanzhao.test;

import com.liuyanzhao.shiro.realm.CustomRealm;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.realm.SimpleAccountRealm;
import org.apache.shiro.subject.Subject;
import org.junit.Before;
import org.junit.Test;

public class CustomRealmTest {

    @Test
    public void testAuthentication() {

        CustomRealm customRealm = new CustomRealm();

        //1、构建SecurityManager环境
        DefaultSecurityManager defaultSecurityManager = new DefaultSecurityManager();
        defaultSecurityManager.setRealm(customRealm);
        //2、主体提交认证请求
        SecurityUtils.setSecurityManager(defaultSecurityManager);
        Subject subject = SecurityUtils.getSubject();

        UsernamePasswordToken token = new UsernamePasswordToken("Tom","1234567");
        subject.login(token);
        System.out.println("isAuthenticated："+subject.isAuthenticated());
        subject.checkRole("admin");
        subject.checkPermissions("user:add","user:delete");

    }
}

四 测试结果

isAuthenticated：true

Process finished with exit code 0