servlet之JDBC操作

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;

/**
 * Created by solitude on 17-7-18.
 */
/*
关于jdbc的操作可以参考文章：http://blog.csdn.net/solitudesky/article/details/72827814

首先导入数据库驱动jar包
其次建立好要操作的数据库

 */
@WebServlet("/JDBCServlet")
public class JDBCServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    // JDBC 驱动名及数据库 URL
    static final String DB_URL = "jdbc:mysql://localhost:3306/test";

    // 数据库的用户名与密码，需要根据自己的设置
    static final String USER = "root";
    static final String PASS = "2Akp10tZ";

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Connection conn = null;
        PreparedStatement ptst = null;

        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String title = "Servlet Mysql 测试";
        String docType = "\n";
        out.println(docType +
                "\n" +
                "\n" +
                "\n" +
                "
" + title + "
\n");
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            String sql = "SELECT id, name, url FROM websites";
            ptst = conn.prepareStatement(sql);
            ResultSet rs = ptst.executeQuery();

            // 展开结果集数据库
            while(rs.next()){
                // 通过字段检索
                int id  = rs.getInt("id");
                String name = rs.getString("name");
                String url = rs.getString("url");

                // 输出数据
                out.println("ID: " + id);
                out.println(", 站点名称: " + name);
                out.println(", 站点 URL: " + url);
                out.println("
");
            }
            out.println("");

            // 完成后关闭
            rs.close();
            ptst.close();
            conn.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 最后是用于关闭资源的块
            try{
                if(ptst!=null)
                    ptst.close();
            }catch(SQLException se2){
            }
            try{
                if(conn!=null)
                    conn.close();
            }catch(SQLException se){
                se.printStackTrace();
            }
        }
    }
}