1.MyEclipse | New Web Project :TestServlet01，修改index.jsp的代码：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <style> body, div, td, input {font-size:18px; margin:0px; } .line {margin:2px; } </style> </head> <body> <form action="/TestServlet01/servlet/PostServlet" method="POST"> <div align="center"> <br/> <fieldset style='60%'> <legend>填写用户信息</legend> <br/> <div class='line'> <div align="left">出发地: <input type="text" id="start" name="start" style='font-size:18px' width=200/> </div> </div> <div class='line'> <div align="left"> <br/><input type="submit" name="Select" value="提交信息" style='font-size:18px'/><br/> </div> </div> </fieldset> </div> </form> </body> </html>
2.src文件夹右键Add | Package ：servlet
3.servlet的Package右键：New | Servlet （此时Web.xml中自然会增加对应的配置）：PostServlet.java：
package servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class PostServlet extends HttpServlet { //自定义变量 private Connection connection = null; //定义数据库连接对象 private String driverName = "com.mysql.jdbc.Driver"; //数据库驱动器 private String userName = "root"; //数据库用户名 private String userPasswd = "123456"; //密码 private String dbName = "test01"; //数据库名称 private String tableName = "Train"; //表明 //连接字符串 数据库地址URL MySQL数据库端口3306 private String url = "jdbc:mysql://localhost:3306/" + dbName + "?user=" + userName + "&password=" + userPasswd; //初始化方法 public void init(ServletConfig config) throws ServletException { super.init(config); } public PostServlet() { super(); } //处理GET请求方法 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("UTF-8"); //设置输出编码 request.setCharacterEncoding("UTF-8"); response.setContentType("text/html"); //设置输出类型 PrintWriter out = response.getWriter(); //获取out对象 try { //数据库操作 Class.forName(driverName).newInstance(); connection = DriverManager.getConnection(url); Statement statement = connection.createStatement(); String startName = request.getParameter("start"); //获取出发地 //注意:startName需要加单引号 否则报错 ——错误：Unknown column 'BeiJing' in 'where clause' String sql = "SELECT * FROM " + tableName +" WHERE startname='" + startName+"';"; if(startName=="") { sql = "SELECT * FROM " + tableName; } ResultSet rs = statement.executeQuery(sql); 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.println(" <fieldset style='60%' ><legend>搜索结果</legend><br />"); out.println(" <TABLE align='center'border='1' cellspacing='1' cellpadding='1'>"); out.println(" <TR><TH>车号</TH><TH>出发地</TH><TH>到达地</TH></TR>"); //循环输出查询结果 while(rs.next()) { out.println(" <TR><TD>" + rs.getString(1) + "</TD>"); out.println(" <TD>" + rs.getString(2) + "</TD>"); out.println(" <TD>" + rs.getString(3) + "</TD></TR>"); } out.println(" </TABLE>"); out.println(" </fieldset>"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); rs.close(); // 关闭记录集 statement.close(); // 关闭声明 } catch(Exception e) { System.out.println("错误："+e.getMessage()); response.sendRedirect("index.jsp"); } } //处理POST请求方法 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } //销毁方法 public void destroy() { super.destroy(); // Just puts "destroy" string in log try { connection.close(); // 关闭连接对象 }catch(Exception e) { System.out.println("关闭数据库错误："+e.getMessage()); } } }
4.MySQL中新建表、增加记录：
use test01; create table Train(id varchar(20) primary key,startname varchar(20),endname varchar(20)); insert train(id,startname,endname) values('T61','KunMing','BeiJing'); insert train(id,startname,endname) values('T62','BeiJing','KunMing'); insert train(id,startname,endname) values('T74','ChangSha','BeiJing'); insert train(id,startname,endname) values('T75','BeiJing','ChangSha'); insert train(id,startname,endname) values('T87','GuiYang','BeiJing'); insert train(id,startname,endname) values('T88','BeiJing','GuiYang');
5.效果：
注意：修改数据库的连接字符串（在PostServlet.java文件中）
本文引用自：http://blog.csdn.net/eastmount/article/details/45725077