Servlet做简单的ajax增删改查（分页）
Posted Angelye
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jdbc.java
1 package servlet; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.ResultSet; 6 import java.sql.SQLException; 7 import java.sql.Statement; 8 9 public class Jdbc { 10 Connection conn; 11 Statement stem; 12 ResultSet re; 13 /* 14 * jdbc五步走： 15 * 1:加载驱动 16 * 2:创建连接 17 * 2.1:地址 18 * 2.2:用户名 root 19 * 2.3:密码 123 20 * 3:创建发送执行sql语句对象 21 * 4:发送执行sql语句 22 * 5:操作结果集 23 */ 24 25 private void lianjie() { 26 try { 27 Class.forName("com.mysql.jdbc.Driver"); 28 conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/guoyihua", "root", "123"); 29 stem = conn.createStatement(); 30 } catch (Exception e) { 31 e.printStackTrace(); 32 } 33 } 34 35 private void guanbi() { 36 try { 37 if (re!=null) { 38 re.close(); 39 } 40 41 if (stem!=null) { 42 stem.close(); 43 } 44 if (conn!=null) { 45 conn.close(); 46 } 47 } catch (SQLException e) { 48 // TODO Auto-generated catch block 49 e.printStackTrace(); 50 } 51 } 52 53 /* 54 * 创建一个应用于任何查询的show方法。 55 * 但凡查询功能一定返回一个结果集 56 */ 57 public ResultSet show ( String sql ){ 58 this.lianjie(); 59 try { 60 re=stem.executeQuery(sql); 61 } catch (SQLException e) { 62 } 63 return re; 64 } 65 66 67 public int update ( String sql ){ 68 this.lianjie(); 69 int i; 70 try { 71 i = stem.executeUpdate(sql); 72 this.guanbi(); 73 return i; 74 } catch (SQLException e) { 75 } 76 return 0; 77 } 78 79 80 }
UserService.java
1 package servlet; 2 3 import java.sql.ResultSet; 4 import java.sql.SQLException; 5 import java.util.ArrayList; 6 import java.util.HashMap; 7 import java.util.List; 8 import java.util.Map; 9 import java.util.Random; 10 11 public class UserService { 12 Jdbc jdbc= new Jdbc(); 13 14 int page=2; 15 16 public List<Map<String, Object>> show(String ye) { 17 int yee = Integer.parseInt(ye); 18 yee=(yee-1)*page; 19 List<Map<String, Object>> list =new ArrayList<Map<String,Object>>(); 20 ResultSet show = jdbc.show("select * from user limit "+yee+" , "+page+" "); 21 try { 22 while (show.next()) { 23 Map<String,Object> map = new HashMap<String, Object>(); 24 map.put("id", show.getInt("id")); 25 map.put("name", show.getString("name")); 26 map.put("password", show.getLong("password")); 27 list.add(map); 28 } 29 } catch (SQLException e) { 30 // TODO Auto-generated catch block 31 e.printStackTrace(); 32 } 33 34 return list; 35 } 36 37 38 public void deletee(String id) { 39 jdbc.update("delete from user where id=‘"+id+"‘ "); 40 } 41 42 43 public Map<String, Object> toupdate(String id) { 44 Map<String, Object> map = new HashMap<String, Object>(); 45 ResultSet re = jdbc.show("select * from user where id=‘"+id+"‘"); 46 try { 47 while (re.next()) { 48 map.put("id", re.getInt("id")); 49 map.put("name", re.getString("name")); 50 map.put("password", re.getLong("password")); 51 } 52 } catch (SQLException e) { 53 // TODO Auto-generated catch block 54 e.printStackTrace(); 55 } 56 return map; 57 } 58 59 60 public void update(String id, String name, String password) { 61 jdbc.update("update user set name=‘"+name+"‘,password=‘"+password+"‘where id=‘"+id+"‘ "); 62 } 63 64 65 public void add(String name, String password) { 66 Random random = new Random(); 67 int id = random.nextInt(1000); 68 jdbc.update("insert into user (id,name,password) values(‘"+id+"‘,‘"+name+"‘,‘"+password+"‘)"); 69 } 70 71 72 public int tablecount() { 73 int tablecount=0; 74 int count=0; 75 ResultSet re = jdbc.show("select count(*) from user "); 76 try { 77 while (re.next()) { 78 tablecount = re.getInt("count(*)"); 79 } 80 } catch (SQLException e) { 81 // TODO Auto-generated catch block 82 e.printStackTrace(); 83 } 84 if(tablecount%page==0){ 85 count = tablecount/page; 86 } 87 if (tablecount%page!=0) { 88 89 count = tablecount/page+1; 90 } 91 return count; 92 } 93 94 95 }
UserServlet.java
1 package servlet; 2 3 import java.io.IOException; 4 import java.io.UnsupportedEncodingException; 5 import java.util.ArrayList; 6 import java.util.List; 7 import java.util.Map; 8 9 import javax.servlet.ServletException; 10 import javax.servlet.http.HttpServlet; 11 import javax.servlet.http.HttpServletRequest; 12 import javax.servlet.http.HttpServletResponse; 13 14 public class UserServlet extends HttpServlet{ 15 List<Map<String, Object>> list= new ArrayList<Map<String,Object>>(); 16 UserService us = new UserService(); 17 HttpServletRequest request; 18 HttpServletResponse response; 19 protected void doGet(HttpServletRequest request, HttpServletResponse response) 20 throws ServletException, IOException { 21 this.request= request; 22 this.response= response; 23 String me = request.getParameter("method"); 24 if (me.equals("show")) { 25 this.show(); 26 } 27 if (me.equals("deletee")) { 28 this.deletee(); 29 } 30 if (me.equals("toupdate")) { 31 this.toupdate(); 32 } 33 if (me.equals("update")) { 34 this.update(); 35 }if (me.equals("add")) { 36 this.add(); 37 } 38 } 39 private void add() throws IOException { 40 String name = request.getParameter("name"); 41 name=new String(name.getBytes("ISO8859-1"), "UTF-8"); 42 String password = request.getParameter("password"); 43 us.add(name,password); 44 response.getWriter().print("<script type=\"text/javascript\">parent.show(1)</script>"); 45 } 46 private void update() throws IOException { 47 String id = request.getParameter("id"); 48 String name = request.getParameter("name"); 49 String password = request.getParameter("password"); 50 name= new String(name.getBytes("ISO8859-1"), "UTF-8"); 51 us.update(id,name,password); 52 response.getWriter().print("<script type=\"text/javascript\">parent.show(1)</script>"); 53 } 54 private void toupdate() throws ServletException, IOException { 55 String id = request.getParameter("id"); 56 Map<String, Object> map = us.toupdate(id); 57 request.setAttribute("map", map); 58 request.getRequestDispatcher("update.jsp").forward(request, response); 59 } 60 private void deletee() throws ServletException, IOException { 61 String id = request.getParameter("id"); 62 us.deletee(id); 63 this.show(); 64 } 65 private void show() throws ServletException, IOException { 66 String ye = request.getParameter("ye"); 67 if (ye==null) { 68 ye="1"; 69 } 70 List<Map<String, Object>> list=us.show(ye); 71 request.setAttribute("li", list); 72 int count=us.tablecount(); 73 request.setAttribute("count", count); 74 request.getRequestDispatcher("show.jsp").forward(request, response); 75 76 } 77 78 }
index.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP ‘index.jsp‘ starting page</title> 13 <meta http-equiv="pragma" content="no-cache"> 14 <meta http-equiv="cache-control" content="no-cache"> 15 <meta http-equiv="expires" content="0"> 16 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 17 <meta http-equiv="description" content="This is my page"> 18 <!-- 19 <link rel="stylesheet" type="text/css" href="styles.css"> 20 --> 21 22 </head> 23 <script type="text/javascript" src="jquery-1.6.js"></script> 24 <script type="text/javascript"> 25 26 function show(ye){ 27 var d= new Date().getTime(); 28 $.get("aa?method=show&ye="+ye+"&d="+d,function(date){ 29 $("#div1").html(date) 30 }) 31 } 32 33 function deletee(id){ 34 var d=new Date().getTime(); 35 $.get("aa?method=deletee&id="+id+"&d="+d,function(date){ 36 $("#div1").html(date); 37 }) 38 } 39 40 function toupdate(id){ 41 $.get("aa?method=toupdate&id="+id,function(date){ 42 $("#div2").html(date); 43 }) 44 } 45 function update(a){ 46 a.submit(); 47 $(a).hide(); 48 } 49 function toadd(){ 50 $.get("add.jsp",function(date){ 51 $("#div3").html(date); 52 }) 53 } 54 function add(a) { 55 a.submit(); 56 $(a).hide(); 57 } 58 </script> 59 60 <body> 61 <a href="javascript:show(1)">查询user表</a> 62 <div id="div1"></div> 63 <div id="div2"></div> 64 <div id="div3"></div> 65 </body> 66 </html>
show.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>My JSP ‘show.jsp‘ starting page</title> 14 15 <meta http-equiv="pragma" content="no-cache"> 16 <meta http-equiv="cache-control" content="no-cache"> 17 <meta http-equiv="expires" content="0"> 18 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 19 <meta http-equiv="description" content="This is my page"> 20 <!-- 21 <link rel="stylesheet" type="text/css" href="styles.css"> 22 --> 23 24 </head> 25 26 <body> 27 <table bgcolor="c0c0c0" bordercolor="green" cellspacing="1"> 28 <tr bordercolor="green"> 29 <td>编号</td> 30 <td>姓名</td> 31 <td>密码</td> 32 <td>修改</td> 33 <td>删除</td> 34 </tr> 35 <c:forEach items="${requestScope.li}" var="list"> 36 <tr> 37 <td>${list.id}</td> 38 <td>${list.name}</td> 39 <td>${list.password}</td> 40 <td><a href="javascript:toupdate(${list.id})">修改</a></td> 41 <td><a href="javascript:deletee(${list.id})">删除</a></td> 42 </tr> 43 </c:forEach> 44 </table> 45 46 <c:if test="${param.ye>1}"> 47 <a href="javascript:show(1)">首页</a> 48 </c:if> 49 <c:if test="${param.ye>1}"> 50 <a href="javascript:show(${param.ye-1})">上一页</a> 51 </c:if> 52 <c:forEach begin="1" end="${requestScope.count}" varStatus="c"> 53 <a href="javascript:show(${c.index})">${c.index}</a> 54 </c:forEach> 55 <c:if test="${param.ye<requestScope.count}"> 56 <a href="javascript:show(${param.ye+1})">下一页</a> 57 </c:if> 58 <c:if test="${param.ye<requestScope.count}"> 59 <a href="javascript:show(${requestScope.count})">尾页</a> 60 </c:if> 61 62 63 <a href="javascript:toadd()"> 添加 </a> 64 </body> 65 </html>
add.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP ‘add.jsp‘ starting page</title> 13 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 23 </head> 24 25 <body> 26 <form action="aa" target="abc"> 27 <h3>请输入以下内容</h3> 28 <input type="hidden" name="id"> 29 <input type="hidden" name="method" value="add" > 30 请输入姓名<input type="text" name="name" ><br/><br/> 31 请输入密码<input type="text" name="password" ><br/><br/> 32 <input type="button" value="确认添加" onclick="javascript:add(this.form)"> 33 <iframe name="abc" style="display: none;" frameborder="1"></iframe> 34 </form> 35 </body> 36 </html>
update.jsp
1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>My JSP ‘update.jsp‘ starting page</title> 13 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 23 </head> 24 25 <body> 26 <form action="aa" target="abc"> 27 <h3>请修改以下内容</h3> 28 <input type="hidden" name="method" value="update"> 29 <input type="hidden" name="id" value="${map.id}"><br/><br/> 30 <input type="text" name="name" value="${map.name}"><br/><br/> 31 <input type="text" name="password" value="${map.password}"><br/><br/> 32 <input type="button" value="确认修改" onclick="javascript:update(this.form)"> 33 <iframe name="abc" style="display: none;"></iframe> 34 </form> 35 </body> 36 </html>
此文章仅为个人学习记录文件，为个人所记笔记。
可供大家参考
但是注释甚少
如有疑问可以留言
希望可以帮助到初学者
2017-08-1119:53:30
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