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elcipse与tomcat下载与安装：https://www.cnblogs.com/duzhuo/p/5425834.html

Demo01:数据库连接

package com.bjsxt.jdbc;

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

public class Demo01 {

	public static void main(String[] args){
		//loading  加载驱动类   //第一步
		try{
			Class.forName("com.mysql.jdbc.Driver");
			//建立连接
			Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/testjsbc","****","****");
			System.out.print(conn);
		}catch(ClassNotFoundException e){
			e.printStackTrace();

		}catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		
	}
}

　　demo02:数据库查询

package com.bjsxt.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class Demo02 {

	public static void main(String[] args){
		//loading  加载驱动类   //第一步
		try{
			Class.forName("com.mysql.jdbc.Driver");
			//建立连接
			Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/testjsbc","***","****");
			//
			Statement stmt=conn.createStatement();
//			String sql="insert into t_user values('2','xiaotian','36')";
//			stmt.execute(sql);
			//测试sql注入 where id=5 or 1=1 这样数据库没保障 故statment类不安全，接下来用preparetstatement
			/*String sql='delete from t_user where id=5';
			stmt.execute(sql);*/
			
			
			
			
		}catch(ClassNotFoundException e){
			e.printStackTrace();

		}catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} 
		
	}
}

　　批处理：