Erstellen Sie eine dao Klasse und eine Klasse Buch
Dao Kategorien:
Paket cn.edu.tzc.dao;
importieren java.sql. *;
import java.util.ArrayList;
import cn.edu.tzc.bean.books;
public class BookDao {
public Arraylist queryAllBooks () throws Exception {
Connection conn = null;
Arraylist Bücher = new Arraylist ();
Versuchen{
Class.forName ( "com.microsoft.sqlserver.jdbc.SQLServerDriver");
conn = DriverManager.getConnection ( "jdbc: sqlserver: // localhost: 1433; Database = Bücher", "sa", "123456");
Statement stat = conn.createStatement ();
String sql = "SELECT * FROM T_BOOK";
ResultSet rs = stat.executeQuery (sql);
while (rs.next ()) {
Bücher BOOK1 neue Bücher = ();
book1.setId (rs.getString ( "ID"));
book1.setName (rs.getString ( "Name"));
book1.setPrice (rs.getString ( "Preis"));
books.add (book1);
}
rs.Close ();
stat.close ();
}
catch (Exception e) {
e.printStackTrace ();
}schließlich{
if (conn! = null)
{
conn.Close ();
conn = null;
}
}
Rückkehr Bücher;
}
}
Buchkategorien:
cn.edu.tzc.bean verpacken;
public class Bücher {
private String id;
private String name;
public String getId () {
Rückkehr id;
}
public void setId (String id) {
this.id = ID;
}
public String getName () {
Rückname;
}
public void setName (String name) {
this.name = name;
}
public String getPrice () {
Rück Preis;
}
public void Setpreis (String Preis) {
this.price = Preis;
}
private String Preis;
}
books.java (Selvert)
Paket Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.http.HttpSession;
public class Bücher erstreckt HttpServlet {
public void SQLFind (HttpServletRequest Anfrage, HttpServletResponse Antwort) {
Http s = request.getSession ();
response.setContentType ( "text / html; charset = UTF-8");
Connection conn = null;
Statement stat = null;
String name = request.getParameter ( "name");
String sql = "SELECT * FROM T_BOOK WHERE name LIKE '% "+ name +" %';"
Versuchen {
Writer writer = response.getWriter ();
Class.forName ( "com.microsoft.sqlserver.jdbc.SQLServerDriver");
conn = DriverManager.getConnection ( "jdbc: sqlserver: // localhost: 1433; Database = Bücher", "sa", "123456");
stat = conn.createStatement ();
ResultSet rs = stat.executeQuery (sql);
int f = 0;
while (rs.next ()) {
f = 1;
String s1 = rs.getString ( "ID");
String s2 = rs.getString ( "Name");
String s3 = rs.getString ( "Preis");
writer.write ( "<form action = \" index.jsp \ ">"
+ "<Input type = \" versteckt \ "name = \ "BOOKID \" value = \ "" + s2 + "\">"
+ "<Input type = \" versteckt \ "name = \ "OptionID \" value = \ "- 1 \">"
+ "Id:" + s1
+ "Name: "+ s2 +" Preis:" + s3
+ "<Input type = \" Eintragen \ "value = \ "添加 \"> </ form>");
}
if (f == 0)
{
writer.write ( "keine Bücher!");
}
stat.close ();
conn.Close ();
} Catch (Exception e) {
System.out.println (e);
// TODO: Handle Ausnahme
}
}
protected void doGet (HttpServletRequest Anfrage, HttpServletResponse Antwort)
wirft ServletException, IOException {
response.setContentType ( "text / html; charset = UTF-8");
Writer writer = response.getWriter ();
SQLFind (request, response);
writer.write ( "<form action = \" index.jsp \ ">"
+ "<Input type = \" versteckt \ "name = \ "BOOKID \" value = \ "\"> <br>"
+ "<Input type = \" versteckt \ "name = \ "OptionID \" value = \ "0 \">"
+ "<Input type = \" Eintragen \ "value = \ "显示 购物 车 \"> </ form>");
}
public void doPost (HttpServletRequest Anfrage, HttpServletResponse Antwort)
wirft ServletException, IOException {
}
}
search.jsp:
<% @ Page import = "java.util.ArrayList" %>
<% @ Page language = "java" content = "text / html; charset = UTF-8"
pageencoding = "UTF-8" %>
<% @ Page import = "cn.edu.tzc.bean.books" %>
<% @ Page import = "cn.edu.tzc.dao.BookDao" %>
<% @ Page import = "java.io.Writer" %>
<Html>
<Body>
<%
BookDao dao = new BookDao ();
Arraylist Pfund = dao.queryAllBooks ();
for (int i = 0; i <books.size (); i ++)
{
Bücher book2 = (Pfund) books.get (i);
session.setAttribute (book2.getName (), 0);
}%>
<Form action = "Bücher">
Bitte geben Sie Titel: <br>
<Input type = "text" name = "name"> <br>
<Input type = "submit" value = "查询"> <input type = "reset" value = "重置">
</ Form>
</ Body>
</ Html>
index.jsp:
<% @ Page import = "cn.edu.tzc.bean.books" %>
<% @ Page import = "cn.edu.tzc.dao.BookDao" %>
<% @ Page language = "java" import = "java.util. *" Pageencoding = "utf-8" %>
<DOCTYPE HTML PUBLIC "- // W3C // DTD HTML 4.01 Transitional // EN">
<Html>
<Body>
<%
BookDao dao = new BookDao ();
Arraylist Pfund = dao.queryAllBooks ();
String id = request.getParameter ( "OptionID");
if (id.equals ( "0")) {
int [] a = new int [1000];
String [] Bookname = new String [1000];
for (int i = 0; i <books.size (); i ++)
{Bücher book2 = (Pfund) books.get (i);
Bookname [i] = book2.getName ();}
for (int i = 0; i <books.size (); i ++) {
a [i] = Integer.parseInt (session.getAttribute (bookname [i]) toString ().);
}
for (int i = 0; i <books.size (); i ++) {
%>
<Form action = "index.jsp">
ID: <% = i + 1%> 书名: <% = Bookname [i]%>
<Input type = "hidden" name = "BookID" value = "<% = Bookname [i]%>">
<Input type = "hidden" name = "OptionID" value = "1">
<Input type = "submit" value = "删除"> <br>
Buchnummer: <% = a [i]%> vorhanden <br>
</ Form>
<%
}
}
wenn sonst (id.equals ( "- 1")) {
String s = request.getParameter ( "BOOKID");
int b = Integer.parseInt (session.getAttribute (en) .ToString ());
session.setAttribute (s, b + 1);
%>
Success!
<%
}
sonst{
String s = request.getParameter ( "BOOKID");
System.out.print (s);
int c = Integer.parseInt (session.getAttribute (en) .ToString ());
if (c-1> 0)
session.setAttribute (s, C-1);
sonst
session.setAttribute (s, 0);
%>
Erfolgreich gelöscht!
<Form>
<Input type = "hidden" name = "BookID" value = "">
<Input type = "hidden" name = "OptionID" value = "0">
<Input type = "submit" value = "确认">
</ Form>
<%
}
%>
</ Body>
</ Html>