今天发现了前几天做的商品系统的一处bug，废了很大的力气才修改完成，在买商品的时候，不会去除库里的商品，今天吧bug 修复了，明天计划继续学习web技术。
运行结果：
代码部分：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>功能选择界面</title>
</head>
<body>
<form>
<table align="center" border="1">
<tr align="center">
<td>
<input type="submit" value="增加商品" formaction="add.jsp" formmethod="post">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="删除商品" formaction="delete.jsp " formmethod="post">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="修改商品" formaction="update.jsp" formmethod="post">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="买商品" formaction="servlet?method=show" formmethod="post">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>增加商品页面</title>
</head>
<body>
<script>
var add='<%=request.getParameter("add")%>';
if(add=="yes"){
alert("添加成功！");
}
</script>
<form action="servlet?method=add" method="post">
<table align="center">
<tr>
<td>名称:</td>
<td>
<input type="text" name="name">
</td>
</tr>
<tr>
<td>价格:</td>
<td>
<input type="text" name="jiage">
</td>
</tr>
<tr>
<td>数量:</td>
<td>
<input type="text" name="shuliang">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="确定" >
<input type="submit" value="返回" formaction="add.jsp" formmethod="post">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>删除商品页面</title>
</head>
<body>
<script>
var delet='<%=request.getParameter("delete")%>';
if(delet=='yes'){
alert("删除成功!");
}
</script>
<form action="servlet?method=delete" method="post">
<table align="center">
<tr>
<td>请输入要删除商品的名称:</td>
<td>
<input type="text" name="name">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="确定">
<input type="submit" value="返回" formaction="gongneng.jsp" formmethod="post">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改分数页面</title>
</head>
<body>
<script>
var update='<%=request.getParameter("update")%>';
if(update=='yes'){
alert("修改成功!");
}
</script>
<form action="servlet?method=update" method="post">
<table align="center">
<tr>
<td>请输入要修改商品名称:</td>
<td>
<input type="text" name="name">
</td>
</tr>
<tr>
<td>请输入要修改后的商品名称:</td>
<td>
<input type="text" name="name1">
</td>
</tr>
<tr>
<td>请输入修改价格:</td>
<td>
<input type="text" name="jiage">
</td>
</tr>
<tr>
<td>请输入修改数量:</td>
<td>
<input type="text" name="shuliang">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="确定">
<input type="submit" value="返回" formaction="gongneng.jsp" formmethod="post">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>显示页面</title>
</head>
<body>
<form>
<table>
<tr>
<td>商品名称</td>
<td>商品价格</td>
<td>数量</td>
<td>选择</td>
</tr>
<tr>
<c:forEach items="${list}" var="item">
<tr>
<td>${item.name}</td>
<td>${item.jiage}</td>
<td>${item.shuliang}</td>
<td><input type="submit" value="选择" formaction="people.jsp" formmethod="post"></td>
</tr>
</c:forEach>
</tr>
<tr>
<td>
<input type="submit" value="返回" formaction="gongneng.jsp" formmethod="post">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>认证界面</title>
</head>
<body>
<script>
var add='<%=request.getParameter("add")%>';
if(add=="yes"){
alert("添加成功！");
}
</script>
<form action="servlet?method=login&name=name1" method="post">
<table align="center">
<tr>
<td>名字:</td>
<td>
<input type="text" name="mingzi">
</td>
</tr>
<tr>
<td>性别:</td>
<td>
<input type="text" name="sex">
</td>
</tr>
<tr>
<td>年龄:</td>
<td>
<input type="text" name="age">
</td>
</tr>
<tr align="center">
<td>
<input type="submit" value="确定" >
<input type="submit" value="返回" formaction="people.jsp" formmethod="post">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>删除商品页面</title>
</head>
<body>
<script>
var delet='<%=request.getParameter("deletes")%>';
if(delet=='yes'){
alert("购买成功!");
}
</script>
</body>
</html>
package com.pp;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
public class dao {
public void insert(shang L) {
String sql="insert into shangpin(name,jiage,shuliang) values(?,?,?)";
Connection con;
try {
con = DBUtil.getConnection();
PreparedStatement pa=con.prepareStatement(sql);
pa.setString(1,L.getName());
pa.setString(2,L.getJiage());
pa.setString(3,L.getShuliang());
pa.execute();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void delete(String name) {
String sql="delete from shangpin where name=?";
Connection con;
try {
con = DBUtil.getConnection();
PreparedStatement pa=con.prepareStatement(sql);
pa.setString(1,name);
pa.execute();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void update(String name1,String name,String jiage,String shuliang) {
String sql="update shangpin set name=? , jiage=? , shuliang=? where name=?";
Connection con;
try {
con = DBUtil.getConnection();
PreparedStatement pa=con.prepareStatement(sql);
pa.setString(1,name1);
pa.setString(2,jiage);
pa.setString(3,shuliang);
pa.setString(4,name);
pa.execute();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public List<shang> select() {
String sql="select * from shangpin";
shang L=null;
List<shang> list=new ArrayList();
Connection con;
try {
con = DBUtil.getConnection();
PreparedStatement pa=con.prepareStatement(sql);
ResultSet rs=pa.executeQuery();
while(rs.next()) {
String jiage=rs.getString("jiage");
String name=rs.getString("name");
String shuliang=rs.getString("shuliang");
L=new shang(name,jiage,shuliang);
list.add(L);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
// public boolean selectp(String num) {
// boolean panduan=false;
// String sql="select * from password";
// Connection con;
// try {
// con = DBUtil.getConnection();
// PreparedStatement pa=con.prepareStatement(sql);
// ResultSet rs=pa.executeQuery();
// while(rs.next()) {
// String numm=rs.getString("num");
// String password=rs.getString("password");
// if(num.equals(numm)&&num.equals(password)) {
// panduan=true;
// break;
// }
// }
// } catch (SQLException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
// return panduan;
// }
}
package com.pp;
import java.sql.*;
public class DBUtil{
private DBUtil() {}
static {
try {
Class.forName("com.mysql.jdbc.Driver");
}catch(ClassNotFoundException e) {
e.printStackTrace();
}
}
public static Connection getConnection() throws SQLException{
return DriverManager.getConnection("jdbc:mysql://localhost:3306/shujuku?serverTimezone=UTC&useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8","root","123456");
}
public static void close(Connection conn,Statement ps,ResultSet rs) {
if(rs!=null) {
try {
rs.close();
}catch(SQLException s) {
s.printStackTrace();
}
}
if(ps!=null) {
try {
ps.close();
}catch(SQLException s) {
s.printStackTrace();
}
}
if(conn!=null) {
try {
conn.close();
}catch(SQLException s) {
s.printStackTrace();
}
}
}
}
package com.pp;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class servlet
*/
@WebServlet("/servlet")
public class servlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public servlet() {
super();
// TODO Auto-generated constructor stub
}
private void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String shuliang=request.getParameter("shuliang");
String name=request.getParameter("name");
String jiage=request.getParameter("jiage");
shang stu=new shang(name,jiage,shuliang);
dao L=new dao();
L.insert(stu);
response.sendRedirect("add.jsp?add=yes");
}
private void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name=request.getParameter("name");
dao L=new dao();
L.delete(name);
response.sendRedirect("delete.jsp?delete=yes");
}
private void delete1(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name=request.getParameter("name");
dao L=new dao();
L.delete(name);
response.sendRedirect("deletes.jsp?deletes=yes");
}
private void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name=request.getParameter("name");
String jiage=request.getParameter("jiage");
String shuliang=request.getParameter("shuliang");
String name1=request.getParameter("name1");
dao L=new dao();
L.update(name1,name,jiage,shuliang);
response.sendRedirect("update.jsp?update=yes");
}
private void show(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
dao L=new dao();
String name=request.getParameter("name");
List<shang> list=L.select();
request.setAttribute("list",list);
request.getRequestDispatcher("show.jsp").forward(request, response);
}
private void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
String name=request.getParameter("name");
String name2=request.getParameter("mingzi");
String sex=request.getParameter("sex");
String age=request.getParameter("age");
if("潘福龙".equals(name2)&&"男".equals(sex)&&"20".equals(age)) {
request.getSession().setAttribute("name",name);
request.getRequestDispatcher("servlet?method=delete1").forward(request, response);
}
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("UTF-8");
String method=request.getParameter("method");
if("add".equals(method)) {
add(request,response);
}
else if("delete".equals(method)) {
delete(request,response);
}
else if("update".equals(method)) {
update(request,response);
}
else if("show".equals(method)) {
show(request,response);
}
else if("delete1".equals(method)) {
delete1(request,response);
}
else if("login".equals(method)) {
login(request,response);
}
}
/**
* @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);
}
}
package com.pp;
public class shang {
private String name;
private String jiage;
private String shuliang;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getJiage() {
return jiage;
}
public void setJiage(String jiage) {
this.jiage = jiage;
}
public String getShuliang() {
return shuliang;
}
public void setShuliang(String shuliang) {
this.shuliang = shuliang;
}
public shang(String name, String jiage, String shuliang) {
super();
this.jiage=jiage;
this.name = name;
this.shuliang = shuliang;
}
}