如何利用SSH隧道连接远程MySQL数据库

delete from mysql.user where host='%';
flush privileges;

# 端口转发
ssh -NCPf test1@192.168.1.200 -p 10022 -L 3388:127.0.0.1:3306
# 查看端口状态
netstat -ano |grep 3388
# 测试MySQL连接
mysql -P 3388 -u root -p
>show databases;

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.jcraft</groupId>
            <artifactId>jsch</artifactId>
            <version>0.1.55</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3388/mysql
    username: root
    password: ysyhl9t
    driver-class-name: com.mysql.jdbc.Driver

package com.example.demo;

import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class Runner implements CommandLineRunner {

    /**
     * 测试代码变量暂不提取
     * @param args
     */
    @Override
    public void run(String... args) throws Exception {
        JSch jsch = new JSch();
        Session session = null;
        try {
            session = jsch.getSession("test1", "192.168.1.200", 10022);
            session.setPassword("flzx3000c");
            session.setConfig("StrictHostKeyChecking", "no");
            session.connect();
            // 设置SSH本地端口转发，本地转发到远程
            session.setPortForwardingL(3388, "127.0.0.1", 3306);
        } catch (Exception e) {
            if (null != session) {
                //关闭ssh连接
                session.disconnect();
            }
            e.printStackTrace();
        }
    }

}

package com.example.demo;

import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;

import javax.annotation.Resource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

@SpringBootTest
class DemoApplicationTests {

    @Resource
    private JdbcTemplate jdbcTemplate;

    @Test
    void contextLoads() {
        String sql = "select host from mysql.user";
        final List<String> list = jdbcTemplate.query(sql, (resultSet, i) -> resultSet.getString("host"));
		System.out.println(list);
    }

}

ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub test1@192.168.1.200