首先，准备开发工具套件，我们并不会引入过多工具包，仅仅需要：
Java8
Vert.x 3
如果你是用Maven做为项目管理工具，请将Vert.x 3引入：
代码实现：
package com.maxleap.mysqlproxy;
import io.vertx.core.AbstractVerticle;
import io.vertx.core.Vertx;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.core.net.NetClient;
import io.vertx.core.net.NetServer;
import io.vertx.core.net.NetSocket;
/**
* @author sneaky
* @since 1.0.0
*/
public class MysqlProxyServer {
private static final Logger logger = LoggerFactory.getLogger(MysqlProxyServer.class);
public static void main(String[] args) {
Vertx.vertx().deployVerticle(new MysqlProxyServerVerticle());
}
public static class MysqlProxyServerVerticle extends AbstractVerticle {
private final int port = 3306;
private final String mysqlHost = "10.10.0.6";
@Override
public void start() throws Exception {
NetServer netServer = vertx.createNetServer();//创建代理服务器
NetClient netClient = vertx.createNetClient();//创建连接mysql客户端
netServer.connectHandler(socket -> netClient.connect(port, mysqlHost, result -> {
//响应来自客户端的连接请求，成功之后，在建立一个与目标mysql服务器的连接
if (result.succeeded()) {
//与目标mysql服务器成功连接连接之后，创造一个MysqlProxyConnection对象,并执行代理方法
new MysqlProxyConnection(socket, result.result()).proxy();
} else {
logger.error(result.cause().getMessage(), result.cause());
socket.close();
}
})).listen(port, listenResult -> {//代理服务器的监听端口
if (listenResult.succeeded()) {
//成功启动代理服务器
logger.info("Mysql proxy server start up.");
} else {
//启动代理服务器失败
logger.error("Mysql proxy exit. because: " + listenResult.cause().getMessage(), listenResult.cause());
System.exit(1);
}
});
}
}
public static class MysqlProxyConnection {
private final NetSocket clientSocket;
private final NetSocket serverSocket;
public MysqlProxyConnection(NetSocket clientSocket, NetSocket serverSocket) {
this.clientSocket = clientSocket;
this.serverSocket = serverSocket;
}
private void proxy() {
//当代理与mysql服务器连接关闭时，关闭client与代理的连接
serverSocket.closeHandler(v -> clientSocket.close());
//反之亦然
clientSocket.closeHandler(v -> serverSocket.close());
//不管那端的连接出现异常时，关闭两端的连接
serverSocket.exceptionHandler(e -> {
logger.error(e.getMessage(), e);
close();
});
clientSocket.exceptionHandler(e -> {
logger.error(e.getMessage(), e);
close();
});
//当收到来自客户端的数据包时，转发给mysql目标服务器
clientSocket.handler(buffer -> serverSocket.write(buffer));
//当收到来自mysql目标服务器的数据包时，转发给客户端
serverSocket.handler(buffer -> clientSocket.write(buffer));
}
private void close() {
clientSocket.close();
serverSocket.close();
}
}
}
测试一下
try {
Class.forName(name);//指定连接类型
Connection conn = DriverManager.getConnection(url, user, password);//url为代理服务器的地址
PreparedStatement pst = conn.prepareStatement("select * from test;");//准备执行语句
ResultSet resultSet = pst.executeQuery();
while (resultSet.next()) {
System.out.println(resultSet.getLong(1) + ": " + resultSet.getString(2));
}
} catch (Exception e) {
e.printStackTrace();
}
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