json实现jsp分页实例介绍(附效果图)

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

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

[{},{},{}]

3.将此字符串 返回到请求页面

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  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 list = new LinkedList(); 
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

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

将json数据解析 并添加到显示的区域

id

用户名

密码

age

另外：要有这两个js哦