標籤：close gets cat response error gen void gpo write
一，本例使用JDBC串連mysql資料庫
package com.test;import java.io.IOException;import java.io.PrintWriter;import java.sql.*;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class GetMysql extends HttpServlet { /** * Constructor of the object. */ public GetMysql() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ private static final long serUid=1L; //載入驅動 static final String jdbc="com.mysql.jdbc.Driver"; //要串連的資料庫url static final String db_url="jdbc:mysql://localhost:3306/test"; //資料庫使用者名稱 static final String user="dyb"; //資料庫密碼 static final String pass="174372150"; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn=null; Statement stmt=null; //顯示的資料的格式 response.setContentType("text/html;charset=UTF-8"); PrintWriter out =response.getWriter(); try { Class.forName("com.mysql.jdbc.Driver"); //輸入使用者名稱密碼和串連。 conn=DriverManager.getConnection(db_url,user,pass); //用於向資料庫發送sql語句 stmt=conn.createStatement(); String sql=null; //輸入sql語句擷取想要的資料 sql="SELECT t.title,t.new_id," + "t.news_type_id,t.new_date," + "d.name FROM t_news t " + "JOIN t_type_id d on t.news_type_id=d.t_type_id"; //發送sql語句並返回結果 ResultSet rs=stmt.executeQuery(sql); //迴圈遍曆列印結果 while (rs.next()) { int id=rs.getInt("t.news_type_id"); String lr=rs.getString("t.title"); String dd=rs.getString("t.new_date"); String name=rs.getString("d.name"); out.print("ID:"+id); out.print("內容："+lr); out.print("日期："+dd); out.print("名稱："+name); out.println("</BR>"); } //關閉通道 rs.close(); conn.close(); stmt.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the POST method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here }}
jsp：JDBCmysql資料庫連接
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