json 在上篇文章已有詳細介紹，json的既簡單易懂，又傳輸迅速。並且能和javascript很好的融為一體。
在不需要添加jar的前提下，能夠很好完成jsp分頁問題。
下面具體介紹分頁實例：
效果如圖所示，采用jsp+servlet技術
首先：編寫一個javaBean User.java
復制代碼 代碼如下:
package bean;
public class User {
private int id;
private String name;
private String password;
private int age;
public User() {
super();
}
public User(int id, String name, String password, int age) {
super();
this.id = id;
this.name = name;
this.password = password;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
//{'id':1,'name':'zhangsan','password':'123','age':1}
return "{'id':"+id+",'name':'"+name+"','password':'"+password+"','age':"+age+"}";
}
}
這裡需要注意的 就是 toString的方法的改變
然後：我們來編寫它的control 層和Dao層
為了簡化代碼，便於取值，數據庫暫寫為一個集合
可以看到，
1.service 接收request請求 得到頁面所要展示當前頁（為第page頁）
2.創建一個字符串，向內依次添加 從數據庫DB 得到的user，並將所有數據封裝
復制代碼 代碼如下:
[{},{},{}]
3.將此字符串 返回到請求頁面
復制代碼 代碼如下:
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import bean.User;
public class Paging extends HttpServlet {
public static final int PER_PAGE = 3;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//分頁 數據源 當前得到第幾頁的記錄 每頁顯示多少條
int page = Integer.parseInt(request.getParameter("page"));
// page = 1 i = 0
//page = 2 3
int length = 0;//記錄當前拿了多少條
StringBuffer sb = new StringBuffer();
sb.append("[");
//[{},{},{}]
String message = null;
if(page >= 1 && page <= 3){
for (int i = (page-1)*PER_PAGE; i < DB.list.size()&&length < PER_PAGE; i++) {
User u = DB.list.get(i);
sb.append(u.toString()+",");
length++;
}
if(length > 0){
message = sb.substring(0, sb.length()-1)+"]";
}else{
message = sb.toString()+"]";
}
}else{
response.setContentType("text/html;charset=utf-8");
response.getWriter().println("搗亂");
return;
}
response.setContentType("text/html;charset=utf-8");
response.getWriter().println(message);
}
}
class DB{
public static List<User> list = new LinkedList<User>();
static{
list.add(new User(1,"zhangsan","zs",34));
list.add(new User(2,"lisi","ls",34));
list.add(new User(3,"a","h",34));
list.add(new User(4,"b","d",34));
list.add(new User(5,"c","g",34));
list.add(new User(6,"d","a",34));
list.add(new User(7,"e","d",34));
list.add(new User(8,"f","e",34));
list.add(new User(9,"g","a",34));
}
}
之後 ：jsp的填寫，通過ajax異步提交page，然後得到相應的字符串
復制代碼 代碼如下:
var mgs = xmlHttpRequest.responseText;
var persons = mgs.evalJSON();
將json數據解析 並添加到顯示的區域
復制代碼 代碼如下:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'regist.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript" src="js/prototype1.6.js"></script>
<script type="text/javascript" src="js/jquery-1.4.4.js"></script>
<script type="text/javascript">
var paging = 0;
//
function page(p){
/*if(p == 'next' && paging < 3){
paging ++;
}else if(p == 'last' && paging > 1) {
paging --;
}else{
alert('錯誤');
}*/
if(p == 'next' && paging < 3){
paging ++;
if(paging > 1){
$(":button:eq(0)").removeAttr('disabled');
}
if(paging == 3){
$(":button:eq(1)").attr('disabled','disabled');
}
}else if(p == 'last' && paging > 1){
paging --;
$(":button:eq(1)").removeAttr('disabled');
if(paging == 1){
$(":button:eq(0)").attr('disabled','disabled');
}
}
createXmlHttpRequest();
xmlHttpRequest.onreadystatechange=back;
var url = encodeURI("/json_page/Paging?page="+paging);
xmlHttpRequest.open("GET",url,true);
xmlHttpRequest.send(null);
}
//假設名字為xmlHttpRequest
function createXmlHttpRequest(){
if(window.ActiveXObject){
xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}else{
xmlHttpRequest = new XmlHttpRequest();
}
}
//回調函數
function back(){
if( xmlHttpRequest.readyState == 4 && xmlHttpRequest.status == 200){
var mgs = xmlHttpRequest.responseText;
var persons = mgs.evalJSON();
//alert(mgs);
$("table").empty();
$("table").append( $("<tr><td>id</td><td>用戶名</td><td>密碼</td><td>age</td></tr>"));
for(var i = 0 ; i < persons.length;i++){
var person = persons[i];
var $tr = $("<tr><td>"+person.id+"</td><td>"+person.name+"</td><td>"+person.password+"</td><td>"+person.age+"</td></tr>");
$("table").append($tr);
}
}
}
</script>
</head>
<body>
<input type="button" disabled="disabled" value="上一頁" onclick="page('last');"/><input type="button" value="下一頁" onclick = "page('next');"/>
<table>
<tr><td>id</td><td>用戶名</td><td>密碼</td><td>age</td></tr>
</table>
</body>
</html>
另外：要有這兩個js哦
復制代碼 代碼如下:
<script type="text/javascript" src="js/prototype1.6.js"></script>
<script type="text/javascript" src="js/jquery-1.4.4.js"></script>
