学步园

Linux系统下Java连接Mysql数据库方法与Windows下类似，具体步骤如下：

下载JDBC（驱动）：mysql-connector-java-5.1.29.tar.gz

解压下载的数据包：tar -zxvf mysql-connector-java-5.1.29.tar.gz

配置JDBC：cp mysql-connector-java-5.1.29-bin.jar
/usr/lib/jvm/java-1.7.0-openjdk-i386/jre/lib/ext/

解压后，mysql-connector-java-5.1.29-bin.jar位于mysql-connector-java-5.1.29目录下。另外，在

Ubuntu系统中，如果你使用是apt-get install命令安装的jdk，那么一般的安装目录是：/usr/lib/jvm。
你还必须明白的是：此步的目的是将连接驱动拷贝到Java的安装目录下，你必须保证Java环境变

量设置正确（apt-get命令安装jdk环境变量不需自己修改），否则后面的Java程序无法找到JDBC。

示例代码：

//package org.gsfan.clustermonitor.dbconnector;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class MysqlConnector {
	
	private String userName = null;
	private String passwd = null;
	private String sql = null;
	
	private Connection connection = null;
	private PreparedStatement preStatement = null;
	private ResultSet resultSet = null;
	
	private static final String dbDriver = "com.mysql.jdbc.Driver";
//	private static final String dbDriver = "org.gjt.mm.mysql.Driver";
//	private static final String dbURL = "jdbc:mysql://192.168.233.130:3306/clusteruser";
	private static final String dbURL = "jdbc:mysql://localhost:3306/clusteruser";//使用主机IP会出错，这是为什么？
	
	public MysqlConnector(String userName, String passwd){
		this.userName = userName;
		this.passwd = passwd;
		
		try {
			Class.forName(dbDriver) ;
		} catch (ClassNotFoundException e1) {
			e1.printStackTrace();
		}

//		String sql = "insert into clusteruser values(2,'gsfan','0620631FGS')";

		try {
		
			connection = DriverManager.getConnection(dbURL, this.userName, this.passwd);
			
//			preStatement = connection.prepareStatement(sql);
//			preStatement.executeUpdate();
			
			sql = "select * from clusteruser";
			preStatement = connection.prepareStatement(sql);
			resultSet = preStatement.executeQuery();
			
			while(resultSet.next()){//没有resultSet.next()会出现异常
				System.out.println("userName = "+resultSet.getString(2)+"\t password = "+resultSet.getString(3));
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args){
		MysqlConnector connector = new MysqlConnector("root", "0620631FGS");
	}
}

编译运行：