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2018-11-05
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摘要：本文主要向大家介绍了Java语言 web代码实例解析9，通过具体的内容向大家展示，希望对大家学习JAVA语言有所帮助。
本文主要向大家介绍了Java语言 web代码实例解析9，通过具体的内容向大家展示，希望对大家学习JAVA语言有所帮助。
bean.jdbc
package bean;
import java.sql.*;
public class jdbc {
static Connection conn=null;
public static Connection getConnection() throws ClassNotFoundException, SQLException {
String user="root";
String drivername="com.mysql.jdbc.Driver";
String usepwd="test";
String dbname="sys";
String url1="jdbc:mysql://localhost:3306/"+dbname;
String url2="?user="+user+"&password="+usepwd;
String url3="&useUnicode=true&characterEncoding=UTF-8";
String url=url1+url2+url3;
Class.forName(drivername);
try{conn=DriverManager.getConnection(url);
return conn;}catch(Exception e) {
e.printStackTrace();
return null;
}
}
public static void free(ResultSet rs,Statement st,Connection conn)
{
try
{
if(rs!=null)
rs.close();
}catch (SQLException e)
{
e.printStackTrace();
}finally{
try
{
if(st!=null)
st.close();
}catch (SQLException e) { e.printStackTrace();
} finally{
if(conn!=null)
try
{
conn.close();
}
catch (SQLException e) {
e.printStackTrace();
}
}
}
}
}
servelet.servelet
package servelet;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.RequestDispatcher;
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 bean.jdbc;
/**
* Servlet implementation class servelet
*/
@WebServlet("/servelet")
public class servelet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public servelet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Connection conn=jdbc.getConnection();
String sql="select * from web8";
PreparedStatement pstmt=conn.prepareStatement(sql);
ResultSet rs=pstmt.executeQuery();
request.setAttribute("rs", rs);
RequestDispatcher rd=request.getRequestDispatcher("web9.jsp");
rd.forward(request, response);
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
web9.jsp
<%@page import="java.sql.ResultSet"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "https://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"<code class="java pl
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