图书管理系统_jdbc连接下基于servlet的最原始的javaWeb项目
最近疯了一段时间，感觉忘得差不多了，找到以前做的项目，重温一下
jdbc连接下基于servlet的最原始的javaWeb项目
工具：Eclipse ，oracle数据库，tomcat7 ，JDK 7
首先说一下需求： 简易的图书管理系统，顾名思义，简约就好，可以少一些表，但是该有的架子还是需要有的
看一下数据库的：
先看一下代码的结构图：分层嘛
再看一下运行的截图，做了拦截器，不登陆是没法访问这个界面的
下面我准备开始一步一步回忆啦，
就已图书那块为例，首先我要见数据库建表，
数据库完成后，就转入java 端啦，分层的思想，先新建包:dao, service ,servlet, database，vo
vo：存实体类，比如图书类
database：操作数据库的类，连接数据库啦，关闭数据库啦等等
dao: 存对数据库增删改查的语句
service ：进行事务控制
servlet：响应jsp 的请求
基本流程就是：（以用户查询图书为例）用户访问网站会发起请求（查询），请求先到servlet,端，servlet调用service里的查询图书的方法，service不是直接处理，而是转发任务去dao，dao调用database进行连接数据库，继而进行实际的查询工作，查出来的结果要进行格式化，就用到了我们的vo,以vo的格式将查询出来的数据格式化，再将结果返回service，service在这个例子里看不出什么作用，但是当用户进行新增或者修改删除时，就有用了，做这些操作可能会失败，service的作用就是如果失败，就进行事务回滚，不破坏数据库原有信息，service将结果返回servlet，servlet跳转至相应页面，将数据展示给用户
没听懂我也没办法啦
我这个项目是把功能也分层啦，图书是图书的，用户是用户的，然后连接数据库的我给封装在一起啦，common里存的就是公共的，什么过滤器啦，登陆登出，验证码啦这些
继续说图书这个模块，
数据的连接和增删改查的语句我都封装在了一起，所以图书模块里就没有这些啦
看看Book 这个类：
public class BookVO {
// id
private String bid;
// 书名
private String btitle;
// 作者
private String bauthor;
// 封面图片
private String bimage;
// 图书简介
private String bbriefinfo;
// 是否可借
private String bcanborrow;
public String getBcanborrow() {
return bcanborrow;
}
public void setBcanborrow(String bcanborrow) {
this.bcanborrow = bcanborrow;
}
public String getBid() {
return bid;
}
public void setBid(String bid) {
this.bid = bid == null ? null : bid.trim();
}
public String getBtitle() {
return btitle;
}
public void setBtitle(String btitle) {
this.btitle = btitle == null ? null : btitle.trim();
}
public String getBauthor() {
return bauthor;
}
public void setBauthor(String bauthor) {
this.bauthor = bauthor == null ? null : bauthor.trim();
}
public String getBimage() {
return bimage;
}
public void setBimage(String bimage) {
this.bimage = bimage == null ? null : bimage.trim();
}
public String getBbriefinfo() {
return bbriefinfo;
}
public void setBbriefinfo(String bbriefinfo) {
this.bbriefinfo = bbriefinfo == null ? null : bbriefinfo.trim();
}
}因为用户要借还书，所有这个功能我给写在一起啦 StudentBorrowBook类
public class StudentBorrowBookVO {
// id
private String sbbid;
// 学生id
private String sid;
// 学生name
private String sname;
// 图书name
private String bname;
// 图书id
private String bid;
// 借书时间
private Date borrowtime;
// 还书时间
private Date returntime;
public String getSname() {
return sname;
}
public void setSname(String sname) {
this.sname = sname;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public String getSbbid() {
return sbbid;
}
public void setSbbid(String sbbid) {
this.sbbid = sbbid == null ? null : sbbid.trim();
}
public String getSid() {
return sid;
}
public void setSid(String sid) {
this.sid = sid == null ? null : sid.trim();
}
public String getBid() {
return bid;
}
public void setBid(String bid) {
this.bid = bid == null ? null : bid.trim();
}
public Date getBorrowtime() {
return borrowtime;
}
//java.util.Dat ----> java.sql.Date
public void setBorrowtime(java.util.Date borrowtime) {
this.borrowtime = new Date(borrowtime.getTime());
}
public Date getReturntime() {
return returntime;
}
public void setReturntime(java.util.Date returntime) {
this.returntime = new Date(returntime.getTime());
}
}添加图书的界面：
<span style="white-space:pre"> </span><form id="addBook" action="<%=request.getContextPath() %>/bookServlet?action=addBook" method="post" enctype="multipart/form-data"> <table cellpadding="3" cellspacing="1" align="center"> <tr> <td align="center" valign="middle">书名：</td> <td align="center" valign="middle"> <input type="text" name="bookTitle"/></td> </tr> <tr> <td align="center" valign="middle">作者：</td> <td align="center" valign="middle"><input type="text" name="bookAuthor" /></td> </tr> <tr> <td align="center" valign="middle" colspan="2"> <div ><img id="ImgPr" width="150px" height="150px"/></div> </td> </tr> <tr> <td align="center" valign="middle">图片：</td> <td align="center" valign="middle"><input type="file" id ="file" name= "file"></td> </tr> <tr> <td align="center" valign="middle">简介：</td> <td align="center" valign="middle"><textarea cols="40" rows="10" name="Bbriefinfo" ></textarea></td> </tr> <tr> <td align="center" valign="middle">可借：</td> <td align="center" valign="middle"><input type="checkbox" name="Bcanborrow" /> </td> </tr> <tr> <td colspan="2" align="center" valign="middle"><input type="submit" value="更新图书" /></td> </tr> </table> </form>主要有个头像的上传，没有使用框架只能自己处理啦，看看servlet就知道了
<span style="white-space:pre"> </span>if("addBook".equals(action)){
//新增图书
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
String[] name =new String[5];
int namelength = 0;
boolean flag = true;//标记是否有新图片上传
try{
List<FileItem> items = sfu.parseRequest(request);
namelength = items.size();
for(int i = 0;i<items.size();i++){
FileItem item = items.get(i);
if(item.isFormField()){
//普通表单域
name[i] = item.getString();
//System.out.println(item.getString());
}
else{
//文件上传域
ServletContext sctx = getServletContext();
//String path = "upload"+File.separator+"img";
if(item.getName().equals("")){
//没有上传
name[i] = "";
flag = false;
}else{
Date date= new Date();
String path = sctx.getRealPath("upload"+File.separator+"img");
//System.out.println(path);
String filename = date.getTime()+""+item.getName();
String picture = path+File.separator+filename;
System.out.println(picture);
name[i] = picture;
File file = new File(picture);
item.write(file);
}
}
}
}catch( Exception e){
e.printStackTrace();
}
BookVO book = new BookVO();
book.setBtitle(name[0]);
book.setBauthor(name[1]);
String str = name[2];
if(flag){
//没有图片上传
str = str.substring(str.indexOf("upload"+File.separator+"img"));
}
//System.out.println(str);
book.setBimage(str);
book.setBbriefinfo(name[3]);
//如果未选中 type="checkbox" 读取不到参数
if(namelength==5){
//可借
book.setBcanborrow("1");
}else{
book.setBcanborrow("0");
}
<strong> BookService bookSerice = new BookSericeImpl();
try {
bookSerice.insertBook(book);</strong>
PageVO page = new PageVO();
page.setCurrentPage(1);
page.setRowsPerPage(10);
//回主页面
backToMian(request, response,page);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}service层调用dao层，事务控制的大概框架：
<span style="white-space:pre"> </span>conn = DBUtil.openConnection();
try {
conn.setAutoCommit(false);
//插入1表
//插入2表
//都成功后才提交commit.
conn.commit();
} catch (SQLException e) {
e.printStackTrace();
try {
conn.rollback();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} finally {
DBUtil.close();
}
dao层：
<span style="white-space:pre"> </span>public void insertBook(BookVO bookVo) throws Exception {
String id = UUID.randomUUID().toString();
//BOOK (BID, BTITLE, BAUTHOR, BIMAGE, BBRIEFINFO, BCANBORROW)
String sql = "INSERT INTO BOOK VALUES(?,?,?,?,?,?)";
List params = new ArrayList();
params.add(id);
params.add(bookVo.getBtitle());
params.add(bookVo.getBauthor());
params.add(bookVo.getBimage());
params.add(bookVo.getBbriefinfo());
params.add(new BigDecimal(bookVo.getBcanborrow()));
executeUpdate(sql,params);
}这里做了查询时的分页
分页代码：
oracle:
sql = "select * from (select p.*, rownum rn from (select * from product order by productid) p where rownum<=?) where rn >?";mysql:
String mysql = "select * from (#mysqlstatement#) as mysql_db limit ?,?";
查询图书时做了分类查询，使用模糊查询就好了
其他的功能跟这个类似,框架打好后，主要工作量就在servlet端啦
贴上book 模块的servlet的全部代码
一个极其简易的 ，serlvet写了400+，感觉没爱了
package com.booksystem.module.book.action.servlet;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.booksystem.common.vo.PageVO;
import com.booksystem.module.book.service.BookSericeImpl;
import com.booksystem.module.book.service.BookService;
import com.booksystem.module.book.service.BorrowBooksService;
import com.booksystem.module.book.service.BorrowBooksServiceImpl;
import com.booksystem.module.book.vo.BookVO;
import com.booksystem.module.book.vo.StudentBorrowBookVO;
public class BookServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("utf-8");
String action = request.getParameter("action");
// URL http://localhost:8008/BooksSystem/bookServlet?action=main
if("main".equals(action)){
PageVO page = new PageVO();
// 当前页，即要查询的是第几页
int currentPage = 1;
// 每页记录数 ,写死
int rowsPerPage = 10;
if(request.getParameter("currentPage")!=null) {
currentPage = Integer.parseInt(request.getParameter("currentPage"));
}
if(request.getParameter("rowsPerPage")!=null) {
rowsPerPage = Integer.parseInt(request.getParameter("rowsPerPage"));
}
page.setCurrentPage(currentPage);
page.setRowsPerPage(rowsPerPage);
backToMian(request, response,page);
}else if("searchByNum".equals(action)){
String queryNum = java.net.URLDecoder.decode(request.getParameter("queryNum"), "UTF-8");
String way = request.getParameter("search");
if(way.equals("BookId")){
//对queryNum 合法性要进行检查
BookService bookSerice = new BookSericeImpl();
try {
BookVO book = bookSerice.findBookById(queryNum);
request.setAttribute("book", book);
request.getRequestDispatcher("source/byBookNum.jsp").forward(request, response);
// request.getRequestDispatcher("source/addBook.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}else if("UserId".equals(way)){
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
try {
List<StudentBorrowBookVO> studentBorrowBookVO = borrowBooksService.findBookByStudentId(queryNum);
request.setAttribute("studentBorrowBookVO",studentBorrowBookVO);
request.getRequestDispatcher("source/byUserNum.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}else if("BookName".equals(way)){
//此处未分页！！！因为点击下一页时servlet参数乱了，需要单独写一个servlet。
BookService bookSerice = new BookSericeImpl();
try {
List<BookVO> books = bookSerice.findBookByName(queryNum,null);
request.setAttribute("books", books);
request.getRequestDispatcher("source/viewBooks.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}else if("UserName".equals(way)){
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
try {
List<StudentBorrowBookVO> studentBorrowBookVO = borrowBooksService.findBookByStudentname(queryNum);
request.setAttribute("studentBorrowBookVO", studentBorrowBookVO);
request.getRequestDispatcher("source/byUserNum.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}
}else if("searchBookById".equals(action)){
//更新图书--查询
String id = request.getParameter("queryNum");
BookService bookSerice = new BookSericeImpl();
try {
BookVO book = bookSerice.findBookById(id);
request.setAttribute("book", book);
request.getRequestDispatcher("source/editBook.jsp").forward(request, response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else if("editBookDo".equals(action)){
//更新图书--修改
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
String[] name =new String[8];
int namelength = 0;
boolean flag = true;//标记是否有新图片上传
try{
List<FileItem> items = sfu.parseRequest(request);
namelength = items.size();
for(int i = 0;i<items.size();i++){
FileItem item = items.get(i);
if(item.isFormField()){
//普通表单域
name[i] = item.getString();
}
else{
//文件上传域
ServletContext sctx = getServletContext();
if(item.getName().equals("")){
//没有上传，获得原图片
name[i] = request.getParameter("ImgPr");
flag = false;
}else{
//String path = "upload"+File.separator+"img";
Date date= new Date();
String path = sctx.getRealPath("upload"+File.separator+"img");
//System.out.println(path);
//有上传
String filename = date.getTime()+item.getName();
String picture = path+File.separator+filename;
//System.out.println(picture);
name[i] = picture;
File file = new File(picture);
item.write(file);
}
}
}
}catch( Exception e){
e.printStackTrace();
}
BookVO book = new BookVO();
book.setBid(name[0]);
book.setBtitle(name[1]);
book.setBauthor(name[2]);
String str = name[3];
if(flag){
//没有图片上传
str = str.substring(str.indexOf("upload"+File.separator+"img"));
}
//System.out.println(str);
book.setBimage(str);
book.setBbriefinfo(name[4]);
//如果未选中 type="checkbox" 读取不到参数
if(namelength==6){
//可借
book.setBcanborrow("1");
}else{
book.setBcanborrow("0");
}
BookService bookSerice = new BookSericeImpl();
try {
bookSerice.updateBook(book);
PageVO page = new PageVO();
page.setCurrentPage(1);
page.setRowsPerPage(10);
//回主页面
backToMian(request, response,page);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else if("addBook".equals(action)){
//新增图书
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload sfu = new ServletFileUpload(factory);
String[] name =new String[5];
int namelength = 0;
boolean flag = true;//标记是否有新图片上传
try{
List<FileItem> items = sfu.parseRequest(request);
namelength = items.size();
for(int i = 0;i<items.size();i++){
FileItem item = items.get(i);
if(item.isFormField()){
//普通表单域
name[i] = item.getString();
//System.out.println(item.getString());
}
else{
//文件上传域
ServletContext sctx = getServletContext();
//String path = "upload"+File.separator+"img";
if(item.getName().equals("")){
//没有上传
name[i] = "";
flag = false;
}else{
Date date= new Date();
String path = sctx.getRealPath("upload"+File.separator+"img");
//System.out.println(path);
String filename = date.getTime()+""+item.getName();
String picture = path+File.separator+filename;
System.out.println(picture);
name[i] = picture;
File file = new File(picture);
item.write(file);
}
}
}
}catch( Exception e){
e.printStackTrace();
}
BookVO book = new BookVO();
book.setBtitle(name[0]);
book.setBauthor(name[1]);
String str = name[2];
if(flag){
//没有图片上传
str = str.substring(str.indexOf("upload"+File.separator+"img"));
}
//System.out.println(str);
book.setBimage(str);
book.setBbriefinfo(name[3]);
//如果未选中 type="checkbox" 读取不到参数
if(namelength==5){
//可借
book.setBcanborrow("1");
}else{
book.setBcanborrow("0");
}
BookService bookSerice = new BookSericeImpl();
try {
bookSerice.insertBook(book);
PageVO page = new PageVO();
page.setCurrentPage(1);
page.setRowsPerPage(10);
//回主页面
backToMian(request, response,page);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else if("deleteBook".equals(action)){
//删除图书
String id = request.getParameter("queryNum");
BookService bookSerice = new BookSericeImpl();
PageVO page = new PageVO();
page.setCurrentPage(1);
page.setRowsPerPage(10);
try {
bookSerice.deleteBook(id);
//回主页面
backToMian(request, response,page);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/* ----------------借阅图书-------------------- */
else if("borrowBook".equals(action)){
//借阅图书
//对是否可借，是否达到借阅上数 检查，修改
String bookId = request.getParameter("bookId");
String userId = request.getParameter("userId");
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
StudentBorrowBookVO studentBorrowBookVO = new StudentBorrowBookVO();
studentBorrowBookVO.setBid(bookId);
studentBorrowBookVO.setSid(userId);
Date borrowDate = new Date();
Calendar calender = Calendar.getInstance();
calender.setTime(borrowDate);
//可借一个月
calender.add(Calendar.MONTH, 1);
Date returnDate = calender.getTime();
studentBorrowBookVO.setBorrowtime(borrowDate);
studentBorrowBookVO.setReturntime(returnDate);
try {
borrowBooksService.insertStudentBorrowBook(studentBorrowBookVO);
//request.getRequestDispatcher("source/borrowManage.jsp").forward(request, response);
response.sendRedirect("source/borrowManage.jsp");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}else if("reBorrowBook".equals(action)){
//续借图书--加一个月
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
StudentBorrowBookVO studentBorrowBookVO =new StudentBorrowBookVO();
try {
String sbbid = request.getParameter("sbbid");
String returntime = request.getParameter("returntime");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdf.parse(returntime) ;
Calendar calender = Calendar.getInstance();
calender.setTime(date);
calender.add(Calendar.MONTH, 1);
date = calender.getTime();
studentBorrowBookVO.setReturntime(date);
studentBorrowBookVO.setSbbid(sbbid);
borrowBooksService.editStudentBorrowBook(studentBorrowBookVO);
// request.getRequestDispatcher("source/borrowManage.jsp").forward(request, response);
response.sendRedirect("source/borrowManage.jsp");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}else if("returnBook".equals(action)){
//归还图书
String sbbid = request.getParameter("sbbid");
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
try {
borrowBooksService.deleteStudentBorrowBook(sbbid);
// request.getRequestDispatcher("source/borrowManage.jsp").forward(request, response);
response.sendRedirect("source/borrowManage.jsp");
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}else if("borrowManage".equals(action)){
String queryNum = java.net.URLDecoder.decode(request.getParameter("queryNum"), "UTF-8");
String way = request.getParameter("search");
// if(way.equals("BookId")){
// ///////////////////////////
// BookService bookSerice = new BookSericeImpl();
// try {
// BookVO book = bookSerice.findBookById(queryNum);
// request.setAttribute("book", book);
// request.getRequestDispatcher("source/byBookNum.jsp").forward(request, response);
//// request.getRequestDispatcher("source/addBook.jsp").forward(request, response);
// } catch (Exception e) {
// e.printStackTrace();
// //错误页面
// }
// }else
if("BookName".equals(way)){
//可以分页
PageVO page = new PageVO();
// 当前页，即要查询的是第几页
int currentPage = 1;
// 每页记录数 ,写死
int rowsPerPage = 5;
if(request.getParameter("currentPage")!=null) {
currentPage = Integer.parseInt(request.getParameter("currentPage"));
}
if(request.getParameter("rowsPerPage")!=null) {
rowsPerPage = Integer.parseInt(request.getParameter("rowsPerPage"));
}
page.setCurrentPage(currentPage);
page.setRowsPerPage(rowsPerPage);
String userid = request.getParameter("userid");
BookService bookSerice = new BookSericeImpl();
try {
List<BookVO> books = bookSerice.findBookByName(queryNum,page);
request.setAttribute("books", books);
request.setAttribute("page", page);
request.setAttribute("userid", userid);
request.getRequestDispatcher("source/borrowBooks.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}else if("UserId".equals(way)){
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
try {
List<StudentBorrowBookVO> studentBorrowBookVO = borrowBooksService.findBookByStudentId(queryNum);
request.setAttribute("studentBorrowBookVO",studentBorrowBookVO);
request.getRequestDispatcher("source/byUserNum.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}else if("UserName".equals(way)){
BorrowBooksService borrowBooksService = new BorrowBooksServiceImpl();
try {
List<StudentBorrowBookVO> studentBorrowBookVO = borrowBooksService.findBookByStudentname(queryNum);
request.setAttribute("studentBorrowBookVO", studentBorrowBookVO);
request.getRequestDispatcher("source/byUserNum.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
//错误页面
}
}
}
}
//返回全部查询页面，需要分页
private void backToMian(HttpServletRequest request, HttpServletResponse response,PageVO page) throws ServletException, IOException{
BookService bookSerice = new BookSericeImpl();
try {
List<BookVO> books = bookSerice.findAllBook(page);
request.setAttribute("books", books);
request.setAttribute("page", page);
request.getRequestDispatcher("source/viewBooks.jsp").forward(request, response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
看一下过滤器的主要代码
<span style="white-space:pre"> </span>String needInterceptUrl = "(.*source.*\\.jsp)|(.*Servlet.*)";
//用户没有登陆，并且访问后面的需要登陆才能访问的页面，跳转到登陆页面；如果用户已经登陆了，无视
if(session.getAttribute(Constant.USER_INFO)==null && servletPath.matches(needInterceptUrl)){
response.sendRedirect("/BooksSystem/index.jsp");
}
项目其实有很多需要完善的，比如界面，错误页面，图书馆的业务等等，太多啦，有需要的可以自行下载源码扩展
为什么需要 1 分，首先申明我不是缺这一分，是担心有人瞎下载源码，用作其他用途，所以加了限制，但是又不会需要你太多分
如果你需要，但是有没有分，可以私信我，或者：[email protected]，不一定及时回复哦！
项目源码：http://download.csdn.net/detail/i_do_can/9383757