网上图书系统（Struts+Hibernate+Jsp）

package com.bsw.team9.struts.action; import java.util.ArrayList; import java.util.Iterator; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import com.bsw.hibernate.dao.BookDAO; import com.bsw.hibernate.pojo.Book; import com.bsw.team9.struts.form.DetailSearchForm; /** * MyEclipse Struts Creation date: 08-21-2009 * * XDoclet definition: * * @struts.action path="/detailSearch" name="detailSearchForm" * input="/detailSearch.jsp" scope="request" validate="true" */ public class DetailSearchAction extends Action { /* * Generated Methods */ /** * Method execute * * @param mapping * @param form * @param request * @param response * @return ActionForward */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { DetailSearchForm df = (DetailSearchForm) form;// TODO Auto-generated BookDAO bd = new BookDAO(); List booklist1 = null; List booklist2 = null; List booklist3 = null; List booklist4 = null; List booklist = null; Book obj1 = null; Book obj2 = null; Book obj3 = null; Book obj4 = null; String author = request.getParameter("author"); String bookname = request.getParameter("bookname"); String bookkind = request.getParameter("bookkind"); String publisher = request.getParameter("publisher"); if (((author == null) || ("".equals(author))) && ((bookname == null) || ("".equals(bookname))) && ((bookkind == null) || ("".equals(bookkind))) && ((publisher == null) || ("".equals(publisher)))) {// 四项全为空返回上一页 String o = "您输入的内容为空，请输入其他图书----谢谢!"; request.setAttribute("m", o); return mapping.getInputForward(); } if ((bookname != null) && !("".equals(bookname))) { booklist2 = bd.findByBookname(bookname); Iterator it2 = booklist2.iterator(); while (it2.hasNext()) { obj2 = (Book) it2.next(); } } if ((author != null) && !("".equals(author))) { booklist1 = bd.findByAuthor(author); Iterator it1 = booklist1.iterator(); while (it1.hasNext()) { obj1 = (Book) it1.next(); } } if ((bookkind != null) && !("".equals(bookkind))) { booklist3 = bd.findByBookkind(bookkind); Iterator it3 = booklist3.iterator(); while (it3.hasNext()) { obj3 = (Book) it3.next(); } } if ((publisher != null) && !("".equals(publisher))) { booklist4 = bd.findByPublisher(publisher); Iterator it4 = booklist4.iterator(); while (it4.hasNext()) { obj4 = (Book) it4.next(); System.out.print(obj4.getAuthor()); } } if ((obj1 != null) || (obj2 != null) || (obj3 != null) || (obj4 != null)) { // boolean b1 = ((obj1.getAuthor() == obj2.getAuthor()) // && (obj2.getAuthor() == obj3.getAuthor()) && (obj3.getAuthor() == // obj4 // .getAuthor())); // boolean b2 = ((obj2.getBookname() == obj1.getBookname()) // && (obj1.getBookname() == obj3.getBookname()) && (obj3 // .getBookname() == obj4.getBookname())); // boolean b3 = ((obj3.getPublisher() == obj2.getPublisher()) // && (obj2.getPublisher() == obj3.getPublisher()) && (obj3 // .getPublisher() == obj4.getPublisher())); // boolean b4 = ((obj4.getBookkind() == obj2.getBookkind()) // && (obj3.getBookkind() == obj4.getBookkind()) && (obj1 // .getBookkind() == obj4.getBookkind())); if ((author != null) && !("".equals(author)) && (bookname != null) && !("".equals(bookname)) && (bookkind != null) && !("".equals(bookkind)) && (publisher != null) && !("".equals(publisher)) && (obj2 != null) && (obj1 != null) && (obj3 != null) && (obj4 != null) && (obj1.getAuthor() == obj2.getAuthor()) && (obj2.getAuthor() == obj3.getAuthor()) && (obj3.getAuthor() == obj4.getAuthor()) && (obj2.getBookname() == obj1.getBookname()) && (obj1.getBookname() == obj3.getBookname()) && (obj3.getBookname() == obj4.getBookname()) && (obj3.getPublisher() == obj2.getPublisher()) && (obj2.getPublisher() == obj1.getPublisher()) && (obj3.getPublisher() == obj4.getPublisher()) && (obj4.getBookkind() == obj2.getBookkind()) && (obj3.getBookkind() == obj4.getBookkind()) && (obj1.getBookkind() == obj4.getBookkind())) {// 四项都不为空时按四项书名，作者，图书种类和出版社查询 booklist = booklist2; } else if ((author != null) && !("".equals(author)) && (bookname != null) && !("".equals(bookname)) && (bookkind != null) && !("".equals(bookkind)) && (obj2 != null) && (obj1 != null) && (obj3 != null) && (obj1.getAuthor() == obj2.getAuthor()) && (obj2.getAuthor() == obj3.getAuthor()) && (obj2.getBookname() == obj1.getBookname()) && (obj1.getBookname() == obj3.getBookname()) && (obj1.getBookkind() == obj2.getBookkind()) && (obj3.getBookkind() == obj2.getBookkind())) {// 不满足四项按则按前三项书名，作者，图书种类查询 booklist = booklist2; } else if ((author != null) && !("".equals(author)) && (bookname != null) && !("".equals(bookname)) && (obj2 != null) && (obj1 != null) && (obj1.getAuthor() == obj2.getAuthor()) && (obj2.getBookname() == obj1.getBookname())) {// 不满足四项，三项则按其中前两项查询 booklist = booklist2; } else if ((bookname != null) && !("".equals(bookname)) && (obj2 != null) ) {// 若不满足四项，三项，两项则按第一项查询 booklist = booklist2; } else if ((author != null) && !("".equals(author)) && (obj1 != null)&& (obj2 == null)) {// 不满足四项，三项和两项则按第二项查询 booklist = booklist1; } else if ((bookkind != null) && !("".equals(bookkind)) && (obj3 != null) && (obj2 == null) && (obj1 == null)) {// 若不满足四项，三项，两项，第一项和第二项则按第三项查询 booklist = booklist3; } else if ((publisher != null) && !("".equals(publisher)) && (obj4 != null) && (obj3 == null) && (obj2 == null) && (obj1 == null)) {// 若不满足四项，三项，两项，第一项，第二项和第三项则按第四项查询 booklist = booklist4; } else {// 若其中四项无任一项在数据库中有与之匹配的数据即书名，作者，出版社，图书种类都不匹配则返回上一页（查询页） String o = "本网暂无此类图书，请输入其他图书----谢谢"; request.setAttribute("m", o); return mapping.getInputForward(); } } else { String o = "本网暂无此类图书，请输入其他图书----谢谢"; request.setAttribute("m", o); return mapping.getInputForward(); } int pageNum = 1; if (request.getParameter("page") != null) pageNum = Integer.parseInt(request.getParameter("page")); int base = 3; if (booklist.size() <= 0 || booklist == null) { request.setAttribute("totalPage", 1); request.setAttribute("pageNum", 1); request.setAttribute("booklist", null); } else { int totalPage = (booklist.size() / base); if (booklist.size() % base > 0) totalPage++; if (pageNum < 1) pageNum = 1; if (pageNum > totalPage) pageNum = totalPage; int currPage = pageNum; --pageNum; int i = 0; int begin = pageNum * base; int end = begin + base; Iterator it = booklist.iterator(); Set bookSet = new HashSet(); while (it.hasNext()) { Book book = (Book) it.next(); if (i >= begin && i < end) bookSet.add(book); i++; } request.setAttribute("totalPage", totalPage); request.setAttribute("pageNum", pageNum); request.setAttribute("currPage", currPage); request.setAttribute("booklist", bookSet); request.setAttribute("flag", "sab");