datacontrol.java

ext示例

package com.ext.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DataControl extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DataControl() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String start = request.getParameter("start");
	   	String limit = request.getParameter("limit");
	   	String sort = request.getParameter("sort");
	   	String dir = request.getParameter("dir");
	   	System.out.println("======>"+sort);
	   	if(dir == null){
	   		dir="ASC";
	   	}
	   	
	   	try{
	   		int index = Integer.parseInt(start);
	   		int pageSize = Integer.parseInt(limit);
	   		
	   		String json = "{totalProperty:100,root:[";
	   		if(dir.equals("ASC")){
	   			for(int i = index;i < pageSize+index;i++)
	   			{
	   				json+="{id:"+i+",STRENUMB:'STRENUMB"+i+"',STRENAME:'STRENAME"+i+"',STREWAY:'STREWAY"+i+"',STREMEMO:'STREMEMO"+i+"',Info:'Info"+i+"'}";
	   				if(i != pageSize+index-1){
	   					json+=",";
	   				}
	   			}
	   		}else{
	   			for(int i = pageSize+index;i>index;i--)
	   			{
	   				json+="{id:"+i+",STRENUMB:'STRENUMB"+i+"',STRENAME:'STRENAME"+i+"',STREWAY:'STREWAY"+i+"',STREMEMO:'STREMEMO"+i+"',Info:'Info"+i+"'}";
	   				if(i!=index-1){
	   					json+=",";
	   				}
	   			}
	   		}
	   		json+="]}";
	   		response.getWriter().write(json);
	   	}catch(Exception ex)
	   	{
	   		ex.printStackTrace();
	   	}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}