java第十三周测试记录

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今天课上遇到了问题，在我的上一篇随笔，这个阻碍了我很长时间，而且上一次也是这个问题，真的吃一堑不长一智，这次我应该就记住了，嗯。

设计思路：

俩个库：

1.一个库存商品，商品的基本属性和商品的数量（数量这个数据与后面的库里面数据会结合）被称为库存数量。

2.一个库存商品出入库信息，有取货和送货的信息。

①我用一个Int型（flag）来区分，flag=0为出库，flag=1为入库。

②也有一个数量，是挪动数量，这个数量与前面那个库的数量有一定的关联，就是取出货后，那个库存数量会减少，当存入货后，那个库存数量会增加。

③剩下的属性全用字符串类型。

我采用的是jsp+severlet+dao+bean模式：

代码：

jsp：

主要函数表的几个jsp：

main.jsp：

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><style>
body{ text-align:center} /* css注释：为了观察效果设置宽度边框高度等样式 */
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>main</title>
</head><body>
<br><br><br><br><br><br><br>//格式好看一点,下面同理
<div>
<input type="button" onclick="test1()" value="ru_ku" style="width:200px;height:50px" />
<script >
function test1(){
var url = "ru_ku.jsp";
window.location.href= url;
}
</script>
</div>
<br><br><br><br><br>
<div>
<input type="button" onclick="test2()" value="chu_ku" style="width:200px;height:50px"/>
<script >
function test2(){
var url = "chu_ku.jsp";
window.location.href= url;
}</script>
</div>
<br><br><br><br><br>
<div>
<input type="button" onclick="test3()" value="cha_ku" style="width:200px;height:50px"/>
<script >
function test3(){
var url = "cha_ku.jsp";
window.location.href= url;
}
</script>
</div>
<br><br><br><br><br>
<div>
<input type="button" onclick="test4()" value="ku" style="width:200px;height:50px"/>
<script >
function test4(){
var url = "ku.jsp";
window.location.href= url;
}
</script></div>
</body>
</html>

chuku.jsp：

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>add</title>
</head>
<body>
<div align="center">
<h1 style="color: red;">出库信息填表</h1>
<a href="main.jsp">返回主页</a>
<form action="TableServlet?method=chu_ku" method="post">
<div class="a">
商品名<input type="text" id="name" name="name"/>
</div>
<div class="a">
厂家名<input type="text" id="changjia" name="changjia" />
</div>
<div class="a">
型号<input type="text" id="xinghao" name="xinghao" />
</div>
<div class="a">
规格<input type="text" id="guige" name="guige" />
</div>
<div class="a">
数量<input type="text" id="shuliang" name="shuliang" />
</div><div class="a">
日期<input type="text" id="date" name="date" />
</div>
<div class="a">
单位<input type="text" id="danwei" name="danwei" />
</div>
<div class="a">
提货人<input type="text" id="renming" name="renming" />
</div>
<div class="a">
<button type="submit" class="b">保存</button>
</div>
</form>
</div>
</body>
</html>

ru_ku.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>add</title>
</head>
<body>
<div align="center">
<h1 style="color: red;">入库信息填表</h1>
<a href="main.jsp">返回主页</a>
<form method="post" action="TableServlet?action=in" >
<div class="a">
商品名<input type="text" id="name" name="name"/>
</div>
<div class="a">
厂家名<input type="text" id="changjia" name="changjia" />
</div>
<div class="a">
型号<input type="text" id="xinghao" name="xinghao" />
</div>
<div class="a">
规格<input type="text" id="guige" name="guige" />
</div>
<div class="a">
数量<input type="text" id="shuliang" name="shuliang" />
</div>
<div class="a">
日期<input type="text" id="date" name="date" />
</div>
<div class="a">
单位<input type="text" id="danwei" name="danwei" />
</div>
<div class="a">
送货人<input type="text" id="renming" name="renming" />
</div>
<div class="a">
<button type="submit" class="b">保存</button>
</div>
</form>
</div>
</body>
</html>

接下来是操作商品库的jsp

ku.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
body{ text-align:center} /* css注释：为了观察效果设置宽度边框高度等样式 */
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>cang_ku</title>
</head>
<body>
<body>
<br><br><br><br><br><br><br>
<div>
<input type="button" onclick="test1()" value="cha_ku" style="width:200px;height:50px" />
<script >
function test1(){
var url = "cha_ku.jsp";
window.location.href= url;
}
</script>
</div>
<br><br><br><br><br>
<div>
<input type="button" onclick="test2()" value="add_ku" style="width:200px;height:50px"/>
<script >
function test2(){
var url = "add_ku.jsp";
window.location.href= url;
}</script>
</div>
<br><br><br><br><br>
<div>
<input type="button" onclick="test3()" value="delete_ku" style="width:200px;height:50px"/>
<script >
function test3(){
var url = "delete_ku.jsp";
window.location.href= url;
}
</script>
</div>
<br><br><br><br><br></body></html>

add_ku.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>add_ku</title>
</head>
<body>
<div align="center">
<h1 style="color: red;">库内物品录入</h1>
<a href="ku.jsp">返回主页</a>
<form action="GoodServlet?action=add" method="post" >
<div class="a">
商品名<input type="text" id="name" name="name"/>
</div>
<div class="a">
厂家名<input type="text" id="changjia" name="changjia" />
</div>
<div class="a">
型号<input type="text" id="xinghao" name="xinghao" />
</div>
<div class="a">
规格<input type="text" id="guige" name="guige" />
</div>
<div class="a">
数量<input type="text" id="number" name="number" />
</div>
<div class="a">
<button type="submit" class="b">保存</button>
</div>
</form>
</div>
</body>
</html>

delete.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>delete_ku</title>
</head>
<body>
<div align="center">
<h1 style="color: red;">库内物品删除</h1>
<a href="ku.jsp">返回主页</a>
<form action="GoodServlet?action=delete" method="post" >
<div class="a">
商品名<input type="text" id="name" name="name"/>
</div>
<div class="a">
厂家名<input type="text" id="changjia" name="changjia" />
</div>
<div class="a">
型号<input type="text" id="xinghao" name="xinghao" />
</div>
<div class="a">
规格<input type="text" id="guige" name="guige" />
</div>
</form>
</div>
</body>
</html>

cha_ku.jsp:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>chao_zhao</title>
</head>
<body>
<div align="center">
<h1 style="color: red;">库内物品查询</h1>
<a href="ku.jsp">返回主页</a>
<form action="GoodServlet?action=cha_xun" method="post" >
<br><br><br><br><br><br><br><br><br>
<br><br><br><br>
<div class="a">
<button type="submit" class="b">保存</button>
</div>
</form>
</div>
</body>
</html>

java代码：

Bean：

package com.jsp.bean;public class Good_Bean {int id;
String name;
String xinghao;
String guige;
String changjia;
int number;
public Good_Bean()
{}
public Good_Bean(int id, String name,String changjia ,String xinghao, String guige, int number) {
// TODO 自动生成的构造函数存根
this.id=id;
this.xinghao=xinghao;
this.guige=guige;
this.changjia=changjia;
this.number=number;
}
public Good_Bean(String name, String changjia,String xinghao, String guige, int number) {
// TODO 自动生成的构造函数存根this.xinghao=xinghao;
this.guige=guige;
this.changjia=changjia;
this.number=number;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getXinghao() {
return xinghao;
}
public void setXinghao(String xinghao) {
this.xinghao = xinghao;
}
public String getGuige() {
return guige;
}
public void setGuige(String guige) {
this.guige = guige;
}
public String getChangjia() {
return changjia;
}
public void setChangjia(String changjia) {
this.changjia = changjia;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}}

package com.jsp.bean;public class Table_Bean {int id;
String name;
String xinghao;
String guige;
String changjia;
int shuliang;
String date;
String danwei;
String renming;
int flag;
public Table_Bean(int id, String name, String changjia, String xinghao, String guige, String date,
String danwei, String renming, int shuliang, int flag) {
this.id=id;
this.name=name;
this.changjia=changjia;
this.xinghao=xinghao;
this.guige=guige;
this.date=date;
this.danwei=danwei;
this.renming=renming;
this.shuliang=shuliang;
this.flag=flag;
// TODO 自动生成的构造函数存根
}
public Table_Bean( String name, String changjia, String xinghao, String guige, String date,
String danwei, String renming, int shuliang, int flag) {this.name=name;
this.changjia=changjia;
this.xinghao=xinghao;
this.guige=guige;
this.date=date;
this.danwei=danwei;
this.renming=renming;
this.shuliang=shuliang;
this.flag=flag;
// TODO 自动生成的构造函数存根
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getXinghao() {
return xinghao;
}
public void setXinghao(String xinghao) {
this.xinghao = xinghao;
}
public String getGuige() {
return guige;
}
public void setGuige(String guige) {
this.guige = guige;
}
public String getChangjia() {
return changjia;
}
public void setChangjia(String changjia) {
this.changjia = changjia;
}
public int getShuliang() {
return shuliang;
}
public void setShuliang(int shuliang) {
this.shuliang = shuliang;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getDanwei() {
return danwei;
}
public void setDanwei(String danwei) {
this.danwei = danwei;
}
public String getRenming() {
return renming;
}
public void setRenming(String renming) {
this.renming = renming;
}
public int getFlag() {
return flag;
}
public void setFlag(int flag) {
this.flag = flag;
}}

Dao：

package com.jsp.dao;import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import com.jsp.bean.Good_Bean;
import com.jsp.util.*;public class Good_Dao {/**
*
* 查看数据是否存在
* @param name
* @param xinghao
* @param guige
* @param changjia
* @return
*/
public boolean cha_xun (String name,String xinghao,String guige,String changjia)
{DButil DB= new DButil();
int i =0;
Connection con =DB.getConn("ku");try {
Statement state = con.createStatement();ResultSet rs = state.executeQuery("select * from goods where name='" + name + "'");
if (rs.next())
{
if(rs.getString("guige").equals(guige))
{
i++;
}
if(rs.getString("changjia").equals(changjia))
{
i++;
}
if(rs.getString("xinghao").equals(xinghao))
{
i++;
}
}} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}if(i==3)
{
return true;
}
else
{
return false;
}}
public int cha__xun(String name,String xinghao,String guige,String changjia)
{DButil DB= new DButil();
int i =0;
int id=0;
Connection con =DB.getConn("ku");try {Statement state = con.createStatement();ResultSet rs = state.executeQuery("select * from goods where name='" + name + "'");
if (rs.next())
{
if(rs.getString("guige").equals(guige))
{
i++;
}
if(rs.getString("changjia").equals(changjia))
{
i++;
}
if(rs.getString("xinghao").equals(xinghao))
{
i++;
}
if(i==3)
{
id=rs.getInt("id");
}
}} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}return id;
}
/**
* 全显示商品数据
* @return
*/
public List<Good_Bean> list() {
DButil DB =new DButil();
String sql = "select * from goods";
List<Good_Bean> list = new ArrayList<>();
Connection conn = DB.getConn();
Statement state = null;
ResultSet rs = null;try {
state = conn.createStatement();
rs = state.executeQuery(sql);
Good_Bean good_bean = null;
while (rs.next()) {int id2 = rs.getInt("id");
String name2 = rs.getString("name");
String changjia2 = rs.getString("changjia");
String xinghao2 = rs.getString("xinghao");
String guige2 = rs.getString("guige");
int number2 =rs.getInt("number");
good_bean = new Good_Bean();
good_bean.setId(id2);
good_bean.setName(name2);
good_bean.setChangjia(changjia2);
good_bean.setXinghao(xinghao2);
good_bean.setGuige(guige2);
good_bean.setNumber(number2);
list.add(good_bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DB.close(rs, state, conn);
}return list;
}
/**
* 增加
* @param good_bean
* @return
*/
public boolean add(Good_Bean good_bean) {
DButil DB =new DButil();
String sql = "insert into goods(name, changjia, xinghao,guige,number) values('" + good_bean.getName() + "','" + good_bean.getChangjia() + "','" + good_bean.getXinghao() + "','" + good_bean.getGuige()+"','" + good_bean.getNumber()+"')";
Connection conn = DB.getConn();
Statement state = null;
boolean f = false;
int a = 0;try {
state = conn.createStatement();
a=state.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
} finally {
DB.close(state, conn);
}if (a > 0) {
f = true;
}
return f;
}/**
* 删除
* @param
* @return
*/
public boolean delete (String name) {
boolean f = false;
String sql = "delete from goods where name='" + name + "'";
DButil DB =new DButil();
Connection conn = DB.getConn("goods");
Statement state = null;
int a = 0;try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DB.close(state, conn);
}if (a > 0) {
f = true;
}
return f;
}
}

Severlet：

package com.jsp.servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
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;import com.jsp.bean.Good_Bean;
import com.jsp.bean.Table_Bean;
import com.jsp.dao.Good_Dao;
import com.jsp.dao.Table_Dao;/**
* Servlet implementation class GoodServlet
*/
@WebServlet("/GoodServlet")
public class GoodServlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public GoodServlet() {
super();
// TODO Auto-generated constructor stub
}/**
* @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");
response.setContentType("text/html;charsetUTF-8");
response.setCharacterEncoding("UTF-8");
String action=request.getParameter("action");
if (action.equals("add")) {
add( request, response);}
else if (action.equals("delete")) {
delete( request, response);
}
else if (action.equals("cha_xun")) {
cha_xun( request, response);
}
else
{}}private void cha_xun(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
// TODO 自动生成的方法存根
Good_Dao good_dao =new Good_Dao();List<Good_Bean> list = new ArrayList<>();
request.setAttribute("goods", list);
list =good_dao.list();
PrintWriter out= response.getWriter();
out = response.getWriter();
out.println("仓库详情");for(int i=0;i<list.size();i++)
{
out.print(" ");
out.print(list.get(i).getId()+" ");
out.print(list.get(i).getChangjia()+" ");
out.print(list.get(i).getXinghao()+" ");
out.print(list.get(i).getGuige()+" ");
out.print(list.get(i).getNumber()+" ");
out.println();
out.println();
}
//request.getRequestDispatcher("cha_ku.jsp").forward(request,response);}private void delete(HttpServletRequest request, HttpServletResponse response) {
// TODO 自动生成的方法存根
Good_Dao good_dao =new Good_Dao();
String name = request.getParameter("name");
String changjia = request.getParameter("changjia");
String xinghao = request.getParameter("xinghao");
String guige = request.getParameter("guige");if(good_dao.cha_xun(name, xinghao, guige, changjia))
{
good_dao.delete(name);
}}private void add(HttpServletRequest request, HttpServletResponse response) {
// TODO 自动生成的方法存根
Good_Dao good_dao =new Good_Dao();
String name = request.getParameter("name");
String changjia = request.getParameter("changjia");
String xinghao = request.getParameter("xinghao");
String guige = request.getParameter("guige");
String number = request.getParameter("number");
int i_number=Integer.parseInt(number);
Good_Bean good_bean= new Good_Bean(name, changjia,xinghao, guige,i_number );
good_dao.add(good_bean);}/**
* @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.jsp.servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
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;import com.jsp.bean.Good_Bean;
import com.jsp.bean.Table_Bean;
import com.jsp.dao.Good_Dao;
import com.jsp.dao.Table_Dao;/**
* Servlet implementation class TableServlet
*/
@WebServlet("/TableServlet")
public class TableServlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public TableServlet() {
super();
// TODO Auto-generated constructor stub
}/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stubrequest.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charsetUTF-8");
response.setCharacterEncoding("UTF-8");
String action=request.getParameter("action");
xian_shi(request,response);
if (action.equals("in")) {
try {
ru_ku(request, response);
} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
} else if (action.equals("out")) {
try {
chu_ku(request, response);
} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
else
{}response.getWriter().append("Served at: ").append(request.getContextPath());
}
private void xian_shi(HttpServletRequest request, HttpServletResponse response) throws IOException {
// TODO 自动生成的方法存根
Table_Dao table_dao =new Table_Dao();List<Table_Bean> list = new ArrayList<>();
request.setAttribute("goods", list);
list =table_dao.list();
PrintWriter out= response.getWriter();
out = response.getWriter();
out.println("仓库搬运详情");for(int i=0;i<list.size();i++)
{
out.print(" ");
out.print(list.get(i).getId()+" ");
out.print(list.get(i).getChangjia()+" ");
out.print(list.get(i).getXinghao()+" ");
out.print(list.get(i).getGuige()+" ");
out.print(list.get(i).getDate()+" ");
out.print(list.get(i).getDanwei()+" ");
out.print(list.get(i).getRenming()+" ");
out.print(list.get(i).getShuliang()+" ");
out.print(list.get(i).getFlag()+" ");
out.println();
out.println();
}
}/**
* flag=0是出库
* @param request
* @param response
* @throws SQLException
*/
private void chu_ku(HttpServletRequest request, HttpServletResponse response) throws SQLException {
// TODO 自动生成的方法存根Table_Dao table_dao =new Table_Dao();
String name = request.getParameter("name");
String changjia = request.getParameter("changjia");
String xinghao = request.getParameter("xinghao");
String guige = request.getParameter("guige");
String danwei = request.getParameter("danwei");
String renming = request.getParameter("renming");
String shuliang = request.getParameter("shuliang");
String date = request.getParameter("date");
int i_shuliang=Integer.parseInt(shuliang);
int flag =0; Table_Bean table_bean= new Table_Bean(name, changjia,xinghao, guige, date, danwei, renming, i_shuliang, flag );
table_dao._ku(table_bean);
}
/**
* flag=1是入库
* @param request
* @param response
* @throws IOException
* @throws ServletException
* @throws SQLException
*/
private void ru_ku(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException, SQLException {
// TODO 自动生成的方法存根
Table_Dao table_dao =new Table_Dao();
String name = request.getParameter("name");
String changjia = request.getParameter("changjia");
String xinghao = request.getParameter("xinghao");
String guige = request.getParameter("guige");
String danwei = request.getParameter("danwei");
String renming = request.getParameter("renming");
String shuliang = request.getParameter("shuliang");
String date = request.getParameter("date");
int i_shuliang=Integer.parseInt(shuliang);
int flag =1;
PrintWriter out= response.getWriter();
out = response.getWriter();
out.println("入库成功");
Table_Bean table_bean= new Table_Bean(name, changjia,xinghao, guige, date, danwei, renming, i_shuliang, flag );
table_bean.setShuliang(i_shuliang);
table_dao._ku(table_bean);
out.println(table_bean.getName());
request.getRequestDispatcher("ru_ku.jsp").forward(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);
}}

DB：

package com.jsp.util;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;/**
* 数据库的工具类
*
* @author 达达超可爱
*
*/
public final class DButil {/**
* 数据库的连接函数
* 库名账号密码
* @return 数据库的连接
*
*/
public Connection getConn(String date_Base,String root,String password)
{
Connection connection =null;
// student 为数据库名称？后面加的是条件
String db_url1="jdbc:mysql://localhost:3306/";
String db_url2="?serverTimezone=UTC";
String db_url=db_url1+date_Base+db_url2;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
connection = DriverManager.getConnection(db_url, root, password);
// System.out.println("Success connect MySql server!"); } catch (Exception e) {}
return connection;
}
public Connection getConn(String date_Base)
{
Connection connection =null;
// student 为数据库名称？后面加的是条件
String db_url1="jdbc:mysql://localhost:3306/";
String db_url2="?serverTimezone=UTC";
String db_url=db_url1+date_Base+db_url2;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
connection = DriverManager.getConnection(db_url, "root", "123456");
// System.out.println("Success connect MySql server!"); } catch (Exception e) {}
return connection;
}
/**
* 数据库的连接函数
* 可修改的
*
* @return 数据库的连接
*/
public Connection getConn()
{
Connection connection =null;
// student 为数据库名称？后面加的是条件
String db_url="jdbc:mysql://localhost:3306/ku?serverTimezone=UTC";
try {
Class.forName("com.mysql.cj.jdbc.Driver");
connection = DriverManager.getConnection(db_url, "root", "123456");
// System.out.println("Success connect MySql server!"); } catch (Exception e) {}return connection;
}public void close(Connection con)
{
if(con!=null)
{
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}public void close(Statement state, Connection conn) {
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}public void close(ResultSet rs, Statement state, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}