json实现jsp分页实例介绍(附效果图)

前端技术 2023/09/03 JSP
json 在上篇文章已有详细介绍，json的既简单易懂，又传输迅速。并且能和javascript很好的融为一体。
在不需要添加jar的前提下，能够很好完成jsp分页问题。
下面具体介绍分页实例：
 
效果如图所示，采用jsp+servlet技术
首先：编写一个javaBean User.java
复制代码 代码如下:

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+\"}\";
}

}

这里需要注意的 就是 toString的方法的改变
然后：我们来编写它的control 层和Dao层
为了简化代码，便于取值，数据库暂写为一个集合
可以看到，
1.service 接收request请求 得到页面所要展示当前页（为第page页）
2.创建一个字符串，向内依次添加 从数据库DB 得到的user，并将所有数据封装
复制代码 代码如下:

[{},{},{}]

3.将此字符串 返回到请求页面
复制代码 代码如下:

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 {
//分页 数据源 当前得到第几页的记录 每页显示多少条
int page = Integer.parseInt(request.getParameter(\"page\"));
// page = 1 i = 0
//page = 2 3
int length = 0;//记录当前拿了多少条
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(\"捣乱\");
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));
}
}

之后 ：jsp的填写，通过ajax异步提交page，然后得到相应的字符串
复制代码 代码如下:

var mgs = xmlHttpRequest.responseText;
var persons = mgs.evalJSON();

将json数据解析 并添加到显示的区域
复制代码 代码如下:

<%@ 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(\'错误\');
}*/
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);
}
//假设名字为xmlHttpRequest
function createXmlHttpRequest(){
if(window.ActiveXObject){
xmlHttpRequest = new ActiveXObject(\"Microsoft.XMLHTTP\");
}else{
xmlHttpRequest = new XmlHttpRequest();
}
}
//回调函数
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>用户名</td><td>密码</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=\"上一页\" onclick=\"page(\'last\');\"/><input type=\"button\" value=\"下一页\" onclick = \"page(\'next\');\"/>
<table>
<tr><td>id</td><td>用户名</td><td>密码</td><td>age</td></tr>
</table>
</body>
</html>

另外：要有这两个js哦
复制代码 代码如下:

<script type=\"text/javascript\" src=\"js/prototype1.6.js\"></script>
<script type=\"text/javascript\" src=\"js/jquery-1.4.4.js\"></script>

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