searchsuggestservlet.java

ajax 入门小例. 实现仿 google 自动提示.

/*************************************************
 @Copyright (C), 2008, lzpeng 
 @File name:      SearchSuggestServlet.java
 @Author:         lzpeng
 @CreateDate:     2008-6-28 
 *************************************************/
package cn.com.lzpeng.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

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

import cn.com.lzpeng.dao.SearchSuggestDAO;
import cn.com.lzpeng.entity.SuggestBean;

/**
 * 
 * servlet 控制器
 * 
 */
public class SearchSuggestServlet extends HttpServlet {

	private static final long serialVersionUID = 965397030561105306L;

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

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy();
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		processTask(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		processTask(request, response);

	}

	/**
	 * 
	 * 处理客户端的 get post请求
	 * 
	 * @param request
	 * @param response
	 * @throws ServletException
	 * @throws IOException
	 */
	public void processTask(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/xml");
		response.setHeader("Cache-Control", "no-cache, must-revalidate");// 设置不缓存
		PrintWriter out = response.getWriter();

		String searchStr = request.getParameter("searchStr");
		StringBuffer xmlDoc = new StringBuffer();
		SearchSuggestDAO dao = new SearchSuggestDAO();
		SuggestBean bean = null;
		ArrayList<SuggestBean> arr = null;

		try {
			arr = dao.getSuggest(searchStr);
			xmlDoc.append("<?xml version=\"1.0\" encoding=\"GB2312\"?>");
			xmlDoc.append("<suggest>");
			for (int i = 0; i < arr.size(); i++) {
				bean = arr.get(i);
				xmlDoc.append("<id>" + String.valueOf(bean.getSuggest_id())
						+ "</id>");
				xmlDoc.append("<title>" + bean.getTitle() + "</title>");
			}

			xmlDoc.append("</suggest>");
			out.print(xmlDoc.toString());
			out.close();
		} catch (Exception e) {
			System.out.println("出现了点问题 :" + e.getMessage());
		}
	}

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

}