图书信息管理java实现代码

图书信息管理与读者信息管理相似，共包括两部分，图书添加和图书查询与修改，图书信息添加要求正确输入图书的八项信息，并且isbn编号唯一，实现过程中要将isbn作为主键。下面看实现过程：

数据库中书籍：

添加书籍过程：

数据库内容增加：

图书的查询与修改：查询过程可以根据不同的条件查询，如isbn，作者，出版社，图书名称等，默认将所有图书全部显示在列表中，输入查询条件后再表格中显示查询结果。

本模块用到标签面板，可以很方便的查询所需要的信息。修改过程输入isbn编号后按回车键将在下方显示所有的图书信息，然后修改图书信息后所有内容就会更新。

图书查询：

图书信息修改：

添加图书源代码如下：addbook.java

package pdsu.bbm.view; 
 
import java.awt.borderlayout; 
import java.awt.flowlayout; 
import java.awt.font; 
import java.awt.image; 
import java.awt.event.actionevent; 
import java.awt.event.actionlistener; 
import java.text.parseexception; 
import java.text.simpledateformat; 
import java.util.date; 
import java.util.iterator; 
import java.util.list; 
import javax.swing.buttongroup; 
import javax.swing.imageicon; 
import javax.swing.jbutton; 
import javax.swing.jcombobox; 
import javax.swing.jframe; 
import javax.swing.jlabel; 
import javax.swing.joptionpane; 
import javax.swing.jpanel; 
import javax.swing.jtextfield; 
import pdsu.bbm.dao.bookdao; 
import pdsu.bbm.dao.booktypedao; 
import pdsu.bbm.model.book; 
import pdsu.bbm.model.booktype; 
public class addbook extends jframe implements actionlistener { 
 
 private jpanel contentpane; 
 private jlabel label_1; 
 private jlabel lbll; 
 private jlabel label_2; 
 private jlabel label_3; 
 private jlabel label_4; 
 private jlabel label_5; 
 jpanel centerppanel; 
 jbutton button1, button2, button3; 
 private jcombobox combobox_1; 
 image icon = new imageicon("image/icon.png").getimage(); 
 private jtextfield isbnfiled; 
 private jtextfield publishfield; 
 private jtextfield publishdatefield; 
 private jtextfield publishtime; 
 private jtextfield unitpricefield; 
 private jtextfield booknamefield; 
 private jtextfield authorfiled; 
 public static void main(string[] args) { 
 new addbook(); 
 } 
 public addbook() { 
 settitle("添加图书信息"); 
 setsize(555, 333); 
 seticonimage(icon); 
 setlocationrelativeto(null); 
 
 settitle("添加图书信息"); 
 setsize(555, 334); 
 setlocationrelativeto(null); 
 setvisible(true); 
 centerppanel = new jpanel(); 
 centerppanel.setlayout(null); 
 jlabel label1 = new jlabel("isbn:"); 
 label1.setfont(new font("宋体", font.plain, 20)); 
 label1.setbounds(71, 26, 95, 42); 
 centerppanel.add(label1); 
 
 isbnfiled = new jtextfield(); 
 isbnfiled.setbounds(120, 30, 110, 30); 
 centerppanel.add(isbnfiled); 
 isbnfiled.setcolumns(10); 
 
 jlabel label = new jlabel("类 别:"); 
 label.setfont(new font("宋体", font.plain, 20)); 
 label.setbounds(306, 30, 116, 35); 
 centerppanel.add(label); 
 
 label_1 = new jlabel("书 名:"); 
 label_1.setfont(new font("宋体", font.plain, 20)); 
 label_1.setbounds(50, 75, 154, 50); 
 centerppanel.add(label_1); 
 
 lbll = new jlabel("作 者:"); 
 lbll.setfont(new font("宋体", font.plain, 20)); 
 lbll.setbounds(306, 75, 137, 50); 
 centerppanel.add(lbll); 
 
 label_2 = new jlabel("出版社:"); 
 label_2.setfont(new font("宋体", font.plain, 20)); 
 label_2.setbounds(50, 130, 154, 50); 
 centerppanel.add(label_2); 
 
 label_3 = new jlabel("出版日期:"); 
 label_3.setfont(new font("宋体", font.plain, 20)); 
 label_3.setbounds(285, 135, 137, 50); 
 centerppanel.add(label_3); 
 
 publishfield = new jtextfield(); 
 publishfield.setcolumns(10); 
 publishfield.setbounds(120, 143, 110, 30); 
 centerppanel.add(publishfield); 
 
 publishdatefield = new jtextfield(); 
 publishdatefield.setcolumns(10); 
 publishdatefield.setbounds(380, 143, 120, 30); 
 centerppanel.add(publishdatefield); 
 
 label_4 = new jlabel("印刷次数:"); 
 label_4.setfont(new font("宋体", font.plain, 20)); 
 label_4.setbounds(28, 190, 154, 50); 
 centerppanel.add(label_4); 
 
 publishtime = new jtextfield(); 
 publishtime.setcolumns(10); 
 publishtime.setbounds(120, 203, 110, 30); 
 centerppanel.add(publishtime); 
 
 label_5 = new jlabel("单 价:"); 
 label_5.setfont(new font("宋体", font.plain, 20)); 
 label_5.setbounds(305, 194, 84, 42); 
 centerppanel.add(label_5); 
 
 unitpricefield = new jtextfield(); 
 unitpricefield.setcolumns(10); 
 unitpricefield.setbounds(380, 203, 120, 30); 
 centerppanel.add(unitpricefield); 
 getcontentpane().add(centerppanel, borderlayout.center); 
 
 booknamefield = new jtextfield(); 
 booknamefield.setcolumns(10); 
 booknamefield.setbounds(120, 86, 110, 30); 
 centerppanel.add(booknamefield); 
 
 authorfiled = new jtextfield(); 
 authorfiled.setcolumns(10); 
 authorfiled.setbounds(380, 86, 120, 30); 
 centerppanel.add(authorfiled); 
 
 list<booktype> rs = booktypedao.selectbooktype(); 
 iterator<booktype> iterator = rs.iterator(); 
 string[] alltypename = new string[rs.size()]; 
 int i = 0; 
 while (iterator.hasnext()) { 
  string typename = iterator.next().gettypename(); 
  alltypename[i] = typename; 
  i++; 
 } 
 combobox_1 = new jcombobox(alltypename); 
 combobox_1.setbounds(380, 30, 120, 30); 
 combobox_1.setfont(new font("宋体", font.plain, 16)); 
 
 centerppanel.add(combobox_1); 
 buttongroup group = new buttongroup(); 
 jpanel panel2 = new jpanel(); 
 panel2.setlayout(new flowlayout()); 
 button1 = new jbutton("添加"); 
 button1.setfont(new font("宋体", font.plain, 20)); 
 
 button2 = new jbutton("关闭"); 
 button2.setfont(new font("宋体", font.plain, 20)); 
 button3 = new jbutton("重置"); 
 button3.setfont(new font("宋体", font.plain, 20)); 
 
 panel2.add(button1); 
 panel2.add(button3); 
 panel2.add(button2); 
 button1.addactionlistener(this); 
 button2.addactionlistener(this); 
 button3.addactionlistener(this); 
 getcontentpane().add(panel2, borderlayout.south); 
 
 setvisible(true); 
 } 
 
 @suppresswarnings("unused") 
 public void actionperformed(actionevent e) { 
 if (e.getsource() == button1) { 
  string isbn = isbnfiled.gettext().tostring(); 
 
  string bookname = booknamefield.gettext(); 
  string author = authorfiled.gettext(); 
  string selecttype = combobox_1.getselecteditem().tostring(); 
  string publish = publishfield.gettext(); 
  string publishdate = publishdatefield.gettext(); 
  string time = publishtime.gettext().trim(); 
  string price = unitpricefield.gettext().trim(); 
 
  if (isbn.equals("") || bookname.equals("") || author.equals("") 
   || selecttype.equals("") || publish.equals("") 
   || publishdate.equals("") || time.equals("") 
   || price.equals("")) { 
  joptionpane.showmessagedialog(this, "请输入完整信息"); 
  return; 
  } else { 
  booktype bt = new booktype(); 
  book book = new book(); 
  book.setisbn(isbn); 
  book.setbookname(bookname); 
  book.setauthor(author); 
  bt.settypename(selecttype); 
  int m = 0; 
  list<booktype> list = booktypedao 
   .selectidbytypename(selecttype); 
  iterator<booktype> ite = list.iterator(); 
  while (ite.hasnext()) { 
   m = ite.next().getid(); 
  } 
  book.settypeid(m + ""); 
  book.setpublish(publish); 
  try { 
   book.setpublishtime(integer.parseint(time)); 
   book.setunitprice(integer.parseint(price)); 
  } catch (numberformatexception e1) { 
   e1.printstacktrace(); 
  } 
   
   simpledateformat sdf = new simpledateformat("yyyy-mm-dd"); 
   date regdate = null; 
   try { 
   regdate =sdf.parse(publishdate); 
   } catch (parseexception e1) { 
   joptionpane.showmessagedialog(this, "请输入正确的日期"); 
   publishdatefield.settext(""); 
   } 
   
   book.setpublishdate(regdate); 
  if(regdate==null) return; 
   
   if (bookdao.selectbookbyisbn(isbn) != null) { 
   joptionpane.showmessagedialog(this, "该isbn编号已存在"); 
   return; 
  } else if (bookdao.insertbook(book) != 0) { 
   joptionpane.showmessagedialog(this, "添加成功"); 
  } else 
   joptionpane.showmessagedialog(this, "添加失败"); 
  } 
 } 
 if (e.getsource() == button3) { 
  isbnfiled.settext(""); 
  booknamefield.settext(""); 
  authorfiled.settext(""); 
  publishfield.settext(""); 
  publishdatefield.settext(""); 
  publishtime.settext(""); 
  unitpricefield.settext(""); 
 } 
 if (e.getsource() == button2) { 
  dispose(); 
  new mainwindow(); 
 
 } 
 } 
 
} 

图书查询与修改源代码：bookselectandmodify.java

package pdsu.bbm.view; 
 
import java.awt.borderlayout; 
import java.awt.dimension; 
import java.awt.font; 
import java.awt.gridlayout; 
import java.awt.image; 
import java.awt.event.actionevent; 
import java.awt.event.actionlistener; 
import java.text.simpledateformat; 
import java.util.arraylist; 
import java.util.date; 
import java.util.iterator; 
import java.util.list; 
import javax.swing.imageicon; 
import javax.swing.jbutton; 
import javax.swing.jcombobox; 
import javax.swing.jframe; 
import javax.swing.jlabel; 
import javax.swing.joptionpane; 
import javax.swing.jpanel; 
import javax.swing.jscrollpane; 
import javax.swing.jtabbedpane; 
import javax.swing.jtable; 
import javax.swing.jtextfield; 
import javax.swing.swingconstants; 
import javax.swing.table.tablemodel; 
import pdsu.bbm.dao.bookdao; 
import pdsu.bbm.dao.booktypedao; 
import pdsu.bbm.model.book; 
import pdsu.bbm.model.booktype; 
 
public class bookselectandmodify extends jframe implements actionlistener { 
 // 设置序列号 
 private static final long serialversionuid = 1l; 
 private jtabbedpane jtabbedpane; // 标签面板 
 // selectjp查询面板 select_conditionjp下拉列表面板 select_resultjp结果按钮面板updatejp修改面板 
 // updatejp修改面板,bookjp中间面板 buttonjp2按钮面板 
 private jpanel selectjp, select_conditionjp, select_resultjp, buttonjp1, 
  bookjp, updatejp, buttonjp2;// 
 private jtextfield selectjtf, isbnjtf, booknamejtf, authorjtf, 
  printtimejtf, publishjtf, publishdatejtf, unitpricejtf; 
 private jlabel isbnjl, booknamejl, authorjl, categoryjl, printtimejl, 
  publishjl, publishdatejl, unitpricejl; 
 // 重点! 
 private jtable jtable;// 定义表格 
 private jcombobox choicejcb, booktypejcb; 
 private jscrollpane jscrollpane; 
 private jbutton selectjb, exitjb, updatejb, resetjb;// 查询按钮，退出按钮,修改按钮，关闭按钮 
 private tablemodel getselect; 
 private string[] title = { "isbn", "图书序列", "图书名称", "作者", " 出版社 ", 
  "出版日期", "印刷次数", "单价" }; 
 image icon = new imageicon("image/icon.png").getimage(); 
 
 public bookselectandmodify() { 
 super(); 
 seticonimage(icon); 
 settitle("图书查询与修改"); 
 setbounds(100, 100, 555, 400); 
 setlocationrelativeto(null); 
 // jtabbedpane选项卡 
 jtabbedpane = new jtabbedpane(); 
 add(jtabbedpane); 
 selectjp = new jpanel(); 
 selectjp.setlayout(new borderlayout()); 
 jtabbedpane.add("图书信息查询", selectjp); 
 
 // 查询条件面板 
 select_conditionjp = new jpanel(); 
 choicejcb = new jcombobox(); 
 string array[] = { "isbn", "图书名称", "图书序列", "作者", "出版社","所有" };// 设置为一维数组 
 for (int i = 0; i < array.length; i++) { 
  choicejcb.additem(array[i]); 
 } 
 select_conditionjp.add(choicejcb); 
 selectjtf = new jtextfield(20); 
 select_conditionjp.add(selectjtf); 
 selectjp.add(select_conditionjp, borderlayout.north); 
 // 查询结果面板 
 select_resultjp = new jpanel(); 
 bookdao dao = new bookdao(); 
 list<book> list = dao.selectbook(); 
 jtable = new jtable(getselect(list), title); 
 
 // !设置表格大小不变 
 jtable.setautoresizemode(jtable.auto_resize_off); 
 // !设置列宽 
 jtable.getcolumnmodel().getcolumn(4).setpreferredwidth(175); 
 jscrollpane = new jscrollpane(jtable);// 把表格加入滚动面板 
 // 显示滚动面板边框 
 jscrollpane.setpreferredsize(new dimension(450, 170)); 
 select_resultjp.add(jscrollpane); 
 selectjp.add(select_resultjp, borderlayout.center); 
 // 查询按钮面板 
 buttonjp1 = new jpanel(); 
 selectjb = new jbutton("查询"); 
 selectjb.setfont(new font("宋体", font.plain, 20)); 
 
 selectjb.addactionlistener(this); 
 buttonjp1.add(selectjb); 
 exitjb = new jbutton("退出"); 
 exitjb.setfont(new font("宋体", font.plain, 20)); 
 exitjb.addactionlistener(this); 
 buttonjp1.add(exitjb); 
 selectjp.add(buttonjp1, borderlayout.south); 
 // 信息修改页面 
 updatejp = new jpanel(); 
 updatejp.setlayout(new borderlayout()); 
 jtabbedpane.addtab("图书信息修改", updatejp); 
 bookjp = new jpanel(); 
 final gridlayout gridlayout = new gridlayout(8, 2); 
 // 设置边框间的距离 
 gridlayout.setvgap(8); 
 gridlayout.sethgap(8); 
 bookjp.setlayout(gridlayout); 
 isbnjl = new jlabel("isbn:"); 
 isbnjl.setfont(new font("宋体",font.plain,20)); 
 isbnjl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(isbnjl); 
 isbnjtf = new jtextfield(20); 
 isbnjtf.addactionlistener(this); 
 bookjp.add(isbnjtf); 
 categoryjl = new jlabel("类 别:"); 
 categoryjl.setfont(new font("宋体",font.plain,20)); 
 categoryjl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(categoryjl); 
 // 下拉列表 
 list<booktype> list1 = booktypedao.selectbooktype(); 
 iterator<booktype> it = list1.iterator(); 
 string ty[] = new string[list1.size()]; 
 int i = 0; 
 booktypejcb = new jcombobox(); 
 while (it.hasnext()) { 
  ty[i] = it.next().gettypename(); 
  booktypejcb.additem(ty[i]); 
  i++; 
 } 
 
 bookjp.add(booktypejcb); 
 
 booknamejl = new jlabel("书 名:"); 
 booknamejl.setfont(new font("宋体",font.plain,20)); 
 booknamejl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(booknamejl); 
 booknamejtf = new jtextfield(); 
 booknamejtf.setcolumns(20); 
 bookjp.add(booknamejtf); 
 
 authorjl = new jlabel("作 者:"); 
 authorjl.setfont(new font("宋体",font.plain,20)); 
 authorjl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(authorjl); 
 authorjtf = new jtextfield(); 
 authorjtf.setcolumns(20); 
 bookjp.add(authorjtf); 
 
 publishjl = new jlabel("出版社:"); 
 publishjl.setfont(new font("宋体",font.plain,20)); 
 publishjl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(publishjl); 
 publishjtf = new jtextfield(); 
 bookjp.add(publishjtf); 
 
 publishdatejl = new jlabel("出版日期:"); 
 publishdatejl.setfont(new font("宋体",font.plain,20)); 
 publishdatejl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(publishdatejl); 
 publishdatejtf = new jtextfield(); 
 publishdatejtf.sethorizontalalignment(swingconstants.left); 
 bookjp.add(publishdatejtf); 
 
 printtimejl = new jlabel("印刷次数:"); 
 printtimejl.setfont(new font("宋体",font.plain,20)); 
 printtimejl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(printtimejl); 
 printtimejtf = new jtextfield(); 
 bookjp.add(printtimejtf); 
 
 unitpricejl = new jlabel("单 价:"); 
 unitpricejl.setfont(new font("宋体",font.plain,20)); 
 unitpricejl.sethorizontalalignment(swingconstants.center); 
 bookjp.add(unitpricejl); 
 unitpricejtf = new jtextfield(); 
 bookjp.add(unitpricejtf); 
 // 按钮面板 
 // 按钮面板设计 
 buttonjp2 = new jpanel(); 
 updatejb = new jbutton("修改"); 
 updatejb.setfont(new font("宋体", font.plain, 20)); 
 
 updatejb.addactionlistener(this); 
 resetjb = new jbutton("关闭"); 
 resetjb.setfont(new font("宋体", font.plain, 20)); 
 
 resetjb.addactionlistener(this); 
 buttonjp2.add(updatejb); 
 buttonjp2.add(resetjb); 
 updatejp.add(bookjp, borderlayout.center); 
 updatejp.add(buttonjp2, borderlayout.south); 
 setvisible(true); 
 setdefaultcloseoperation(jframe.exit_on_close); 
 } 
 
 // 将查询表格加入面板 
 private object[][] getselect(list<book> list) { 
 // todo auto-generated method stub 
 object[][] objects = new object[list.size()][title.length]; 
 for (int i = 0; i < list.size(); i++) { 
  book book = list.get(i); 
  objects[i][0] = book.getisbn(); 
  objects[i][1] = book.gettypeid();// 图书序列 
  objects[i][2] = book.getbookname();// 图书名称 
  objects[i][3] = book.getauthor();// 图书作者 
  objects[i][4] = book.getpublish();// 出版社 
  objects[i][5] = book.getpublishdate();// 出版日期 
  objects[i][6] = book.getpublishtime();// 印刷次数 
  objects[i][7] = book.getunitprice();// 单价 
 } 
 
 return objects; 
 
 } 
 public void actionperformed(actionevent e) { 
 // todo auto-generated method stub 
 if(e.getsource()==isbnjtf){ 
  string isbn=isbnjtf.gettext(); 
  string typename=null; 
  string id=bookdao.selectbookbyisbn(isbn).gettypeid(); 
  
  typename=booktypedao.selectbyid(id); 
  system.out.println(typename); 
  booktypejcb.setselecteditem(typename); 
  booknamejtf.settext(bookdao.selectbookbyisbn(isbn).getbookname()); 
  authorjtf.settext(bookdao.selectbookbyisbn(isbn).getauthor()); 
  publishjtf.settext(bookdao.selectbookbyisbn(isbn).getpublish()); 
  publishdatejtf.settext(bookdao.selectbookbyisbn(isbn).getpublishdate()+""); 
  printtimejtf.settext(bookdao.selectbookbyisbn(isbn).getpublishtime()+""); 
  unitpricejtf.settext(bookdao.selectbookbyisbn(isbn).getunitprice()+""); 
  
 } 
 if (e.getsource() == selectjb) {// 按照isbn编码查找 
  int r = choicejcb.getselectedindex(); 
  if (r == 0) { 
  string name = selectjtf.gettext().trim(); 
  // 强制转换为线性表类型 
  list<book> list = new arraylist<book>(); 
  book book = bookdao.selectbookbyisbn(name); 
  if (book == null) { 
   joptionpane.showmessagedialog(this, "该编码不存在!"); 
  } else { 
   list.add(book); 
   object[][] data = getselect(list); 
   jtable = new jtable(data, title); 
   jtable.getcolumnmodel().getcolumn(4).setpreferredwidth(175); 
   jtable.setautoresizemode(jtable.auto_resize_off); 
 
   jscrollpane.setviewportview(jtable); 
 
  } 
  } 
 
  if (r == 1) {// 根据图书名称查询信息 
  string name = selectjtf.gettext().tostring(); 
  list<book> list = bookdao.selectbookbyname(name); 
  // 判断线性表是否为空 
  if (list == null || list.size() == 0) { 
   joptionpane.showmessagedialog(this, "该图书不存在!"); 
  } else { 
   object[][] data = getselect(list); 
   jtable = new jtable(data, title); 
   tianjia(); 
  } 
  } 
  if (r == 2) {// 根据图书序列查询信息 
  string name = selectjtf.gettext().tostring(); 
  list<book> list = bookdao.selectbookbytype(name); 
  // 判断线性表是否为空 
  if (list == null || list.size() == 0) { 
   joptionpane.showmessagedialog(this, "该图书不存在!"); 
  } else { 
   object[][] data = getselect(list); 
   jtable = new jtable(data, title); 
   tianjia(); 
  } 
  } 
  if (r == 3) { // 根据作者进行查找 
  string name = selectjtf.gettext().tostring(); 
  // 根据作者进行查找 
  list<book> list = bookdao.selectbookbyauthor(name); 
  // 判断线性表是否为空 
  if (list == null || list.size() == 0) { 
   joptionpane.showmessagedialog(this, "该图书不存在!"); 
  } else { 
   object[][] data = getselect(list); 
   jtable = new jtable(data, title); 
   tianjia(); 
  } 
  } 
  if (r == 4) {// 根据出版社进行查找 
  string name = selectjtf.gettext().tostring(); 
  list<book> list = bookdao.selectbookbypublish(name); 
  if (list == null || list.size() == 0) { 
   joptionpane.showmessagedialog(this, "该图书不存在!"); 
  } else { 
   object[][] data = getselect(list); 
   jtable = new jtable(data, title); 
   tianjia(); 
 
  } 
  } 
  if(r==5){ 
  list<book> list =bookdao.selectbook(); 
  } 
 } 
 if (e.getsource() == updatejb) { 
  string isbn = isbnjtf.gettext().trim(); 
  string typename = ((string) booktypejcb.getselecteditem()).trim(); 
  string id = booktypedao.selectbytypename(typename); 
  string bookname = booknamejtf.gettext(); 
  string author = authorjtf.gettext(); 
  string publish = publishjtf.gettext(); 
  string publishdate = publishdatejtf.gettext(); 
 
  simpledateformat sdf = new simpledateformat("yyyy-mm-dd"); 
  date regdate = null; 
  try { 
  regdate = sdf.parse(publishdate); 
  } catch (exception e2) { 
  e2.printstacktrace(); 
  joptionpane.showmessagedialog(this, "请输入正确的日期格式!"); 
  } 
  if (regdate == null) 
  return; 
  int publishtime = integer.parseint(printtimejtf.gettext()); 
  int unitprice = integer.parseint(unitpricejtf.gettext()); 
  // 封装对象 
  book book = new book(); 
  book.setisbn(isbn); 
  book.settypeid(id); 
  book.setbookname(bookname); 
  book.setauthor(author); 
  book.setpublish(publish); 
  book.setpublishdate(regdate); 
  book.setpublishtime(publishtime); 
  book.setunitprice(unitprice); 
  book.settypename(typename); 
  int result = bookdao.update(book); 
  list<book> list2 = new arraylist<book>(); 
  list2.add(book); 
 
  // system.out.println(list2); 
 
  if (result == 1) { 
  joptionpane.showmessagedialog(this, "修改成功!"); 
  bookdao bk=new bookdao(); 
  list<book> list =bk.selectbook(); 
  jtable =new jtable(getselect(list),title); 
  tianjia(); 
   
  } else { 
  joptionpane.showmessagedialog(this, "修改失败!"); 
  } 
 } 
 if (e.getsource() == resetjb) { 
  dispose(); 
  new mainwindow(); 
 } 
 if (e.getsource() == exitjb) { 
  dispose(); 
  new mainwindow(); 
 } 
 } 
 
 private void tianjia() { 
 jtable.getcolumnmodel().getcolumn(4).setpreferredwidth(175); 
 jtable.setautoresizemode(jtable.auto_resize_off); 
 
 jscrollpane.setviewportview(jtable); 
 
 } 
 
 public static void main(string[] args) { 
 new bookselectandmodify(); 
 
 } 
} 

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