[javaEE] JDBC快速入門

JDBC：Java Data Base Connectivity java數據庫連接

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1.組成JDBC的兩個包：主要是接口

java.sql javax.sql

2.相應JDBC的數據庫實現

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在tomcat的目錄下面添加mysql-connector-java-5.0.8-bin.jar這個數據庫驅動包

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package com.tsh.web;import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/***/
public class DbServlet extends HttpServlet {private static final long serialVersionUID = 1L;/***/public DbServlet() {super();// TODO Auto-generated constructor stub
    }/***/protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {try {// 注冊數據庫驅動//DriverManager.registerDriver(new Driver());//使用反射的方式Class.forName("com.mysql.jdbc.Driver");//獲取數據庫連接，導包的時候，注意要導java.sql下的，面向接口編程Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/java","root","root");//獲取傳輸器對象Statement statement=conn.createStatement();//獲取結果集對象ResultSet resultSet=statement.executeQuery("select * from user");//遍歷while(resultSet.next()){String username=resultSet.getString("username");response.getWriter().write(username);}} catch (Exception e) {e.printStackTrace();}}/***/protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {}}

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