<form action="servlet/Add" method="post" ><table><tr><td align="center" colspan="2"><h2>添加图书信息</h2><br></td></tr><tr><td align="right">ID：</td><td><input type="text" name="id"></td></tr><tr><td align="right">DVD名称：</td><td><input type="text" name="name"></td></tr><tr><td align="right">状态：</td><td><input type="text" name="state"></td></tr><tr><td align="right">日期：</td><td><input type="text" name="date"></td></tr><tr><td align="right">次数：</td><td><input type="text" name="count"></td></tr></table><div class="w"><input type="submit" value="提交" > <input type="reset" value="清除" ><input type="button" value="退出" οnclick="window.location.href='/dvd/index.jsp'"></div>

                request. setCharacterEncoding("UTF-8"); //是为了避免中文乱码String id=request.getParameter("id");String name=request.getParameter("name");/*String state=request.getParameter("state");String date=request.getParameter("date");String count=request.getParameter("count");*/Connection con = Connect.get();try {PreparedStatement ps=con.prepareStatement("insert into dvd1(id,name) value('"+id+"','"+name+"')");ps.executeUpdate();ps.close();con.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}response.sendRedirect("/dvd/servlet/Check");

<input type="button" value="删除" οnclick="delete1()">

<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
<script type="text/javascript">
function delete1(){if($('input[type=checkbox]:checked').length<1){alert("请选择要删除的信息");}else{var ids='';$('input[type=checkbox]:checked').each(function(index,element){ids+=$(element).val()+',';});window.location.href='servlet/Delete?ids='+ids;}  }
</script>

                request. setCharacterEncoding("UTF-8");String ids=request.getParameter("ids");String[] str=ids.split(",");Connection con = Connect.get();//连接数据库try {Statement st = con.createStatement();for(String id:str){st.executeUpdate("delete from dvd1 where id="+id);}st.close();con.close();} catch (SQLException e) {e.printStackTrace();}response.sendRedirect("/dvd/servlet/Check");

<input type="button" value="修改" οnclick="change()">

<script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script>
<script type="text/javascript">function change(){if($('input[type=checkbox]:checked').length!=1){alert("请选择一条信息");}else{window.location.href='servlet/Change?id='+$('input[type=checkbox]:checked').val();}}
</script>

                request. setCharacterEncoding("UTF-8");String id=request.getParameter("id");Connection con = Connect.get();try {Statement st = con.createStatement();ResultSet rs = st.executeQuery("select * from dvd1 where id="+id);ResultSetMetaData rm = rs.getMetaData();List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();while (rs.next()) {Map<String, Object> m = new HashMap<String, Object>();for (int i = 1; i <= rm.getColumnCount(); i++) {m.put(rm.getColumnName(i), rs.getObject(i));}list.add(m);}rs.close();st.close();con.close();request.setAttribute("lists", list);request.getRequestDispatcher("/change.jsp").forward(request,response);//转发} catch (SQLException e) {e.printStackTrace();}

<form action="servlet/Change" method="post" ><%request.setCharacterEncoding("utf-8");@SuppressWarnings("unchecked")List<Map<String, Object>> list = (List<Map<String, Object>>) request.getAttribute("lists");if (list == null || list.size() == 0) {out.print("数据库中没有数据");} else {%><table><tr><td align="center" colspan="2"><h2>修改信息</h2><br></td></tr><tr><td align="right">ID：</td><td><input type="text" name="id" value="<%=list.get(0).get("id") %>" readonly="readonly"></td></tr><tr><td align="right">DVD名称：</td><td><input type="text" name="name" value="<%=list.get(0).get("name") %>"></td></tr><tr><td align="right">状态：</td><td><input type="text" name="state" value="<%=list.get(0).get("state1") %>"></td></tr><tr><td align="right">日期：</td><td><input type="text" name="date" value="<%=list.get(0).get("date1") %>"></td></tr><tr><td align="right">次数：</td><td><input type="text" name="count" value="<%=list.get(0).get("count1") %>"></td></tr><%} %></table><div class="w"><input type="submit" value="提交" > <input type="reset" value="清除" ><input type="button" value="退出" οnclick="window.location.href='/dvd/index.jsp'"></div>
</form>

request. setCharacterEncoding("UTF-8"); String id=request.getParameter("id");String name=request.getParameter("name");String date=request.getParameter("date");String state=request.getParameter("state");String count=request.getParameter("count");Connection con = Connect.get();try {PreparedStatement ps=con.prepareStatement("update dvd1 set name='"+name+"',state1="+state+",date1="+date+",
count1="+count+" where id="+id);ps.executeUpdate();ps.close();con.close();} catch (SQLException e) {e.printStackTrace();}response.sendRedirect("/dvd/servlet/Check");