JDBC：Java Data Base Connectivity java数据库连接
1.组成JDBC的两个包：主要是接口
2.相应JDBC的数据库实现
在tomcat的目录下面添加MysqL-connector-java-5.0.8-bin.jar这个数据库驱动包
@H_404_43@package com.tsh.web;
import java.io.IOException;
java.sql.Connection;
java.sql.DriverManager;
java.sql.ResultSet;
java.sql.Statement;
javax.servlet.ServletException;
javax.servlet.http.HttpServlet;
javax.servlet.http.HttpServletRequest;
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 {
注册数据库驱动
DriverManager.registerDriver(new Driver());
使用反射的方式
Class.forName("com.MysqL.jdbc.Driver");
获取数据库连接，导包的时候，注意要导java.sql下的，面向接口编程
Connection conn=DriverManager.getConnection("jdbc:MysqL://localhost:3306/java","root","root"获取传输器对象
Statement statement=conn.createStatement();
获取结果集对象
ResultSet resultSet=statement.executeQuery("select * from user"遍历
while(resultSet.next()){
String username=resultSet.getString("username");
response.getWriter().write(username);
}
} catch (Exception e) {
e.printStackTrace();
}
}
doPost(HttpServletRequest request,IOException {
}
}