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Ext.onReady(function() {

store3 = new Ext.data.JsonStore({
autoDestroy: true,
totalProperty : 'totle',
url: 'service.do',
storeId: 'myStore',
root: 'data',
fields : [ 'id', "name", "pw" ]
});

var pagingToolbar = new Ext.PagingToolbar({
emptyMsg : "沒有數據",
displayInfo : true,
displayMsg : "顯示從{0}條數據到{1}條數據，共{2}條數據",
store : store3,
pageSize : 50
});

var grade = new Ext.grid.GridPanel({
title : "數據列表",
store : store3,
height : 300,
bbar : pagingToolbar,
columns : [ {
header : "id",
dataIndex : "id",
width : 300
}, {
header : "name",
dataIndex : "name",
width : 300
}, {
header : "pw",
dataIndex : "pw"
} ],
region : 'center'
});

var panel = new Ext.Viewport({
layout : 'border',
items : [ grade ]
});
});

action********************

protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {

List list = new ArrayList();
for (int i = 0; i < 50; i++) {
Person p = new Person();
p.setId("id" + i);
p.setName("name" + i);
p.setPw("pw" + i);
list.add(p);
}
StringBuffer info = new StringBuffer();
info.append("{totle:2000,data:");
info.append(JSONArray.fromObject(list));
info.append("}");
System.out.println(info.toString());
System.out.println("*****doPos");
request.setAttribute("info", info.toString());
request.getRequestDispatcher("/info.jsp").forward(request, response);
}

info.jsp************注意：jsp除了 @page 不能有其他的文字

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
${info}

web.xml***************

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<servlet>
<servlet-name>test</servlet-name>
<servlet-class>com.aa.TestAction</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>test</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>