实现网上购物系统的后台管理（增、删、改、查图书）。
2024-05-13 05:54:33
实验描述：
（实验三的任务）用户网上注册，注册信息写入数据库。
（实验四的任务）用户登陆后，进入网上购物系统，选择书籍，加入购物车，购物完毕进入结账界面（可模拟一下，简单输出一些信息）；在用户购物的期间内，可随时查看购物车的状态，进入购物车后，也可返回再选择商品；在购物期间，用户也可以注销。
本次的任务：管理员以“admin”为用户名进行注册（或登录），对书籍进行后台管理（增、删、改
、查）。
、查）。
问题：
sql=sql+"publisher='"+publisher+"‘ where bookname='"+name+"'";与
sql=sql+"publisher='"+publisher+"'"+" where bookname='"+name+"'";
区别很大，看似很相同，第一个不能运行，第二个oK
感受：
很多语句和一些简单的应用很不熟，犯了很多小白问题
练习太少了，
贴个后台代码：
jsp:页面
Backmanger.jsp
<%@ 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><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><form action="backLogin.jsp" method="post"><table><tr><td colspan="2" align="center">后台管理登陆</td></tr><tr><td>数据库名称：</td><td><input type="text" name="pdatebasename"/></td></tr><tr><td>表的名字：</td><td><input type="text" name="ptable"/></td></tr> <tr><td>用户名：</td><td><input type="text" name="puser"/></td></tr> <tr><td>密码：</td><td><input type="password" name="pwd"/></td></tr> <tr><td ><input type="submit" value=" 管理员登陆"/></td></tr> </table></form></body>
</html>
logIn.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="dao.backConnect" %>
<%@ page import="bean.backConnectbean" %><%
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 'backLogin.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><jsp:useBean id="user1" class="bean.backConnectbean" scope="session"></jsp:useBean><jsp:setProperty property="*" name="user1"/><%// System.out.println(user.getPdatebasename()+" "+user.getPuser()+" "+user.getPwd());// String ps=request.getParameter("pwd");boolean flag=(new backConnect()).getConn(user1.getPdatebasename(),user1.getPuser(),user1.getPwd());System.out.println("flag 初始化成功");if(flag){response.sendRedirect("displayBook1.jsp");}else{response.sendRedirect("BackManger.jsp");}%></body>
</html>
display
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="dao.BookDao"%>
<%@page import="bean.BookBean"%>
<%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 'displayBooks.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><%%>欢迎您 管理员，请选择相关操作<form action="process.jsp" method="post">"<table border="1"><tr><td>请选择</td><td>书名</td><td>出版社</td><td>作者</td><td>价格</td><td>出版日期</td><td>库存数量</td></tr><%BookDao bookDao=new BookDao();ArrayList list=bookDao.selectAllBooks();Iterator it=list.iterator();while(it.hasNext()){BookBean book=(BookBean)it.next();%><tr><td><input type="checkbox" name="bookid" value="<%=book.getBookid() %>"/> </td><td><%=book.getBookname() %></td><td><%=book.getPublisher() %></td><td><%=book.getAuthor() %></td><td><%=book.getPrice() %></td><td><%=book.getPublishDate() %></td><td><%=book.getCount() %></td></tr><% }%><tr><td><select name="flag">
<option value="增加" selected>增加</option>
<option value="减少">减少</option>
<option value="改正">改正</option>
<option value="查询">查询</option>
</select><br></inut></td></tr><tr><td colspan="7" align="center"><input type="submit" value="提交"/></td></tr></table></form></body>
</html>
process.jsp
<%@ 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 'process.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><%String flag=request.getParameter("flag");if(flag.equals("增加")){response.sendRedirect("zhengjia.jsp");}else if(flag.equals("减少")){response.sendRedirect("jianshao.jsp");}else if(flag.equals("改正")){response.sendRedirect("gaizheng.jsp");}else if(flag.equals("查询")){response.sendRedirect("chaxun.jsp");}%></body>
</html>
zhengjia.jsp
<%@ 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 'regist.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><form action="zhengjiaservlet" method="get"><table><tr><td colspan="2" align="center">要增加的内容</td></tr><tr><td>编号：</td><td><input type="text" name="bookid"/></td></tr><tr><td>书名：</td><td><input type="text" name="bookname"/></td></tr><tr><td>出版社：</td><td><input type="text" name="publisher"/></td></tr> <tr><td>作者：</td><td><input type="text" name="author" /> <tr><td>价格：</td><td><input type="text" name="price"/></td></tr> <tr><td>出版日期：</td><td><input type="text" name="publishDate"/></td></tr><tr><td>数量：</td><td><input type="text" name="count"/></td></tr> <tr><td colspan="2" align="center"><input type="submit" value="提交"/></td></tr> </table></form></body>
</html>
jianshao.jsp
<%@ 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 'regist.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><form action="jianshaoservlet" method="get"><table><tr><td colspan="2" align="center">要删去的书名</td></tr><tr><td>书名：</td><td><input type="text" name="bookname"/></td></tr><tr><td colspan="2" align="center"><input type="submit" value="提交"/></td></tr> </table></form></body>
</html>
gaizheng.jsp
<%@ 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 'regist.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><form action="gaizheng" method="get"><table><tr><td colspan="2" align="center">要改正的书名及要修改的相关信息</td></tr><tr><td>书名：</td><td><input type="text" name="bookname"/></td></tr><tr><td>出版社：</td><td><input type="text" name="publisher"/></td></tr> <tr><td>作者：</td><td><input type="text" name="author" /> <tr><td>价格：</td><td><input type="text" name="price"/></td></tr> <tr><td>出版日期：</td><td><input type="text" name="publishDate"/></td></tr><tr><td>数量：</td><td><input type="text" name="count"/></td></tr> <tr><td colspan="2" align="center"><input type="submit" value="提交"/></td></tr> </table></form></body>
</html>
chaxun.jsp (水水滴）
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="dao.BookDao"%>
<%@page import="bean.BookBean"%>
<%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 'displayBooks.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8"); %><%%><p>书籍信息</p><form action="process.jsp" method="post">"<table border="1"><tr><td>编号</td><td>书名</td><td>出版社</td><td>作者</td><td>价格</td><td>出版日期</td><td>库存数量</td></tr><%BookDao bookDao=new BookDao();ArrayList list=bookDao.selectAllBooks();Iterator it=list.iterator();while(it.hasNext()){BookBean book=(BookBean)it.next();%><tr><td><input type="checkbox" name="bookid" value="<%=book.getBookid() %>"/> </td><td><%=book.getBookname() %></td><td><%=book.getPublisher() %></td><td><%=book.getAuthor() %></td><td><%=book.getPrice() %></td><td><%=book.getPublishDate() %></td><td><%=book.getCount() %></td></tr><% }%><tr><td></inut></td></tr></td></tr></table></form></body>
</html>
bean
backbean.
package dao;import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;public class backConnect {public boolean getConn(String datebaseName,String user,String pwd){try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");System.out.print(datebaseName+" "+user+" "+pwd);String url="jdbc:sqlserver://127.0.0.1:1433;databaseName="+datebaseName;Connection con;con=DriverManager.getConnection(url,user,pwd);System.out.print("连接成功");return true;} catch (SQLException e) {// TODO Auto-generated catch blockSystem.out.print("连接失败一");e.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blockSystem.out.print("连接失败二");e.printStackTrace();}return false;}
}dao 里的
backconnect.java
package bean;public class backConnectbean {private String pdatebasename="nothing";private String ptable="nothing";private String puser="nothing";private String pwd="nothing";public String getPdatebasename() {return pdatebasename;}public void setPdatebasename(String datebaseName) {this.pdatebasename = datebaseName;}public String getPtable() {return ptable;}public void setPtable(String ptable) {this.ptable = ptable;}public String getPuser() {return puser;}public void setPuser(String puser) {this.puser = puser;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}}
巨关键的bookdao.java
package dao;import dao.BaseDao;
import java.io.*;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import bean.BookBean;
import java.sql.*;
public class BookDao {Connection con=new BaseDao().getConn();private PreparedStatement pstat;String sql="";public boolean Zhengjia(BookBean user){sql = "insert into book values(?,?,?,?,?,?,?)";try{pstat = con.prepareStatement(sql);pstat.setString(1,user.getBookid());pstat.setString(2,user.getBookname());pstat.setString(3,user.getPublisher());pstat.setString(4,user.getAuthor());pstat.setString(5,user.getPrice());pstat.setString(6,user.getPublishDate());pstat.setInt(7,user.getCount());pstat.executeUpdate();pstat.close();con.close();return true;}catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return false;}public boolean jianshao(String name){sql = "delete from book where bookname='"+name+"'";try{Statement sql1;sql1=con.createStatement();sql1.executeUpdate(sql);con.close();return true;}catch (SQLException e) {// TODO Auto-generated catch block//e.printStackTrace();}return false;}public boolean gaizheng(String name,String publisher,String author,String price,String publishDate,int count){if(true){System.out.println(name+publisher+author+price+publishDate+count);}String sql = "update book set ";String sql1 = "update book set ";String sql2 = "update book set ";String sql3 = "update book set ";String sql4 = "update book set ";if(publisher!=null){sql=sql+"publisher='"+publisher+"'"+" where bookname='"+name+"'";}if(author!=null){sql1+="author='"+author+"'"+" where bookname='"+name+"'";}if(price!=null){sql2+="price='"+price+"'"+" where bookname='"+name+"'";}if(publishDate!=null){sql3+="poublishDate='"+publishDate+"'"+" where bookname='"+name+"'";}if(count!=0 ){sql4+="count='"+count+"'"+" where bookname='"+name+"'";;}System.out.println(sql);System.out.println("try 前");try{Statement sql11;sql11=con.createStatement();sql11.executeUpdate(sql);System.out.println("try 中");sql11.executeUpdate(sql1);sql11.executeUpdate(sql2);sql11.executeUpdate(sql3);sql11.executeUpdate(sql4);con.close();System.out.println("try 后");return true;}catch (SQLException e) {// TODO Auto-generated catch block//e.printStackTrace();}return false;}public ArrayList selectAllBooks(){ArrayList<BookBean> list=new ArrayList();String selectSql="select * from book";try {PreparedStatement pst=con.prepareStatement(selectSql);ResultSet rs=pst.executeQuery();while(rs.next()){BookBean book=new BookBean();book.setBookid(rs.getString(1));book.setBookname(rs.getString(2));book.setPublisher(rs.getString(3));book.setAuthor(rs.getString(4));book.setPrice(rs.getString(5));book.setPublishDate(rs.getString(6));book.setCount(rs.getInt(7));list.add(book);}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return list;}public String selectBookById(String bookId){String bookName=null;String selectSql="select bookname from book where bookid=?";try {PreparedStatement pst=con.prepareStatement(selectSql);pst.setString(1, bookId);ResultSet rs=pst.executeQuery();if(rs.next()){bookName=rs.getString(1);}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return bookName;}
}
servlet
zhengjia.jsp
package servlet;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import dao.BookDao;public class gaizheng extends HttpServlet {/*** Constructor of the object.*/public gaizheng() {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*/public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");response.setCharacterEncoding("utf-8");request.setCharacterEncoding("utf-8");String bookname = new String(request.getParameter("bookname").getBytes("ISO8859_1"),"utf-8");String publisher = new String(request.getParameter("publisher").getBytes("ISO8859_1"),"utf-8");String author = new String(request.getParameter("author").getBytes("ISO8859_1"),"utf-8");String price = new String(request.getParameter("price").getBytes("ISO8859_1"),"utf-8");String publishDate = new String(request.getParameter("publishDate").getBytes("ISO8859_1"),"utf-8");String count1 = new String(request.getParameter("count").getBytes("ISO8859_1"),"utf-8");int count=Integer.parseInt(count1);BookDao dao = new BookDao();if(dao.gaizheng(bookname,publisher,author,price,publishDate,count)){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(" Successful！！！ ");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}else{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(" Defeated!!! ");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}}/*** 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}}
jianshao.jsp
package servlet;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import dao.BookDao;public class jianshaoservlet extends HttpServlet {/*** Constructor of the object.*/public jianshaoservlet() {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*/public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");response.setCharacterEncoding("utf-8");request.setCharacterEncoding("utf-8");String bookname = new String(request.getParameter("bookname").getBytes("ISO8859_1"),"utf-8");BookDao dao = new BookDao();if(dao.jianshao(bookname)){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(" Successful！！！ ");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}else{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(" Defeated!!! ");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}}/*** 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}}
gaizheng.jsp
package servlet;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import dao.BookDao;public class gaizheng extends HttpServlet {/*** Constructor of the object.*/public gaizheng() {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*/public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");response.setCharacterEncoding("utf-8");request.setCharacterEncoding("utf-8");String bookname = new String(request.getParameter("bookname").getBytes("ISO8859_1"),"utf-8");String publisher = new String(request.getParameter("publisher").getBytes("ISO8859_1"),"utf-8");String author = new String(request.getParameter("author").getBytes("ISO8859_1"),"utf-8");String price = new String(request.getParameter("price").getBytes("ISO8859_1"),"utf-8");String publishDate = new String(request.getParameter("publishDate").getBytes("ISO8859_1"),"utf-8");String count1 = new String(request.getParameter("count").getBytes("ISO8859_1"),"utf-8");int count=Integer.parseInt(count1);BookDao dao = new BookDao();if(dao.gaizheng(bookname,publisher,author,price,publishDate,count)){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(" Successful！！！ ");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}else{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(" Defeated!!! ");out.println(" </BODY>");out.println("</HTML>");out.flush();out.close();}}/*** 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}}
代码打包：
去我的资源里下吧
这个链接是城通网盘 的链接
http://home.400gb.com/mydisk.php?item=files&action=index&folder_id=1213171实现网上购物系统的后台管理（增、删、改、查图书）。相关推荐
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