JdbcRealmTest 代码如下

package com.imooc.test;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.mgt.DefaultSecurityManager;
import org.apache.shiro.realm.jdbc.JdbcRealm;
import org.apache.shiro.realm.text.IniRealm;
import org.apache.shiro.subject.Subject;
import org.junit.Test;

public class JdbcRealmTest {
    DruidDataSource dataSource = new DruidDataSource();

    {
        // dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        //dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/test");
        dataSource.setUsername("root");
        dataSource.setPassword("root");
    }

    @Test
    public void testAuthentication() {
        JdbcRealm jdbcRealm = new JdbcRealm();

        jdbcRealm.setDataSource(dataSource);

        //1.构建SecurityManager环境
        DefaultSecurityManager defaultSecurityManager = new DefaultSecurityManager();
        defaultSecurityManager.setRealm(jdbcRealm);

        //2.主体提交认证请求
        SecurityUtils.setSecurityManager(defaultSecurityManager);
        Subject subject = SecurityUtils.getSubject();

        UsernamePasswordToken token = new UsernamePasswordToken("Mark", "123456");
        subject.login(token);

        System.out.println("isAuthenticated:" + subject.isAuthenticated());


        /*subject.checkRole("admin");
         subject.checkPermission("user:delete");
         subject.checkPermission("user:update");*/

    }
}

 报错如下：

四月 18, 2019 3:59:07 下午 com.alibaba.druid.pool.DruidDataSource error

严重: create connection SQLException, url: jdbc:mysql://localhost:3306/test, errorCode 0, state 08S01

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

at sun.reflect.GeneratedConstructorAccessor5.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)

at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)

at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2186)

at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2219)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2014)

at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)

at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)

at sun.reflect.GeneratedConstructorAccessor2.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)

at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1510)

at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1575)

at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2450)

Caused by: java.net.ConnectException: Connection refused: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

at java.net.Socket.connect(Socket.java:589)

at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)

at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)

... 14 more

这个意思是本地还需要有MySQL数据库吗？第一次接触这个东西，不明白，跪求解答