JDBC连接Oracle数据库

1、首先导入oracle的jar包

2、编写java代码

package file;

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

public class JDBC {
    public static void main(String[] args) {
        String driver = "oracle.jdbc.driver.OracleDriver";
        String passwrod = "devel";
        String userName = "devel";
        String url = "jdbc:oracle:thin:@192.168.1.203:1521:orcl"; 
        String sql = "SELECT * FROM T_ROLE";
    
        try {
            Class.forName(driver);
            Connection conn = DriverManager.getConnection(url, userName,passwrod);
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while (rs.next()) {
                System.out.println("ROLE_ID : " + rs.getInt(1) + " ROLE_NAME : " + rs.getString(2));
            }
            // 关闭记录集
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            // 关闭声明

            if (ps != null) {
                try {
                    ps.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            // 关闭链接对象
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}