java连接Mysql jdbc

testjdbc.java

import com.mysql.jdbc.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class testjdbc {
    static final String DB_URL = "jdbc:mysql://10.47.12.205:3306/mysql?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true";
    //注意：useSSL=true  / false
    // MySQL的JDBC URL编写方式：jdbc:mysql://主机名称：连接端口/数据库的名称
    static final String USER = "root";
    static final String PASS = "jetflow123";

    public static void main(String[] args) throws SQLException,Exception{
        Connection conn = null;
        Statement stat = null;

        // 注册驱动
        Class.forName("com.mysql.jdbc.Driver");

        // 创建链接
        conn = (Connection) DriverManager.getConnection(DB_URL,USER,PASS);

        // 执行查询
        stat = conn.createStatement();
        String sql = "SELECT * FROM user";
        ResultSet rs = stat.executeQuery(sql);
        // 输出查询结果
        while(rs.next()){
            System.out.print(rs.getString("Host")+",");
            System.out.print(rs.getString("User")+",");
            System.out.print("\n");
        }
        // 关闭
        try {
            if (rs != null) {
                rs.close();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (stat != null) {
                    stat.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (conn != null) {
                        conn.close();
                    }
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

connect.java

import java.sql.*;
public class conn {

    public static void main(String[] args) {
        String driver = "com.mysql.jdbc.Driver";
        String URL = "jdbc:mysql://10.47.12.205:3306/mysql?autoReconnect=true&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false";
        //注意：useSSL=true  / false
        Connection con = null;
        try
        {
            Class.forName(driver);
        }
        catch(java.lang.ClassNotFoundException e)
        {
            System.out.println("Connect Successfull.");
            System.out.println("Cant't load Driver");
        }
        try
        {
            con=DriverManager.getConnection(URL,"root","jetflow123");
            System.out.println("Connect Successfull.");
        }
        catch(Exception e)
        {
            System.out.println("Connect fail:" + e.getMessage());
        }
    }
}