Ajax 模糊查询的简单实现

类似于百度的搜索引擎模糊查询功能，不过百度的模糊查询功能更强大，这里简单实现下.

要实现模糊查询，首先要做的就是把SQL写好。话不多少，直接贴代码了!

JSP页面：

<%@ 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 'search.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="prototype.js"></script>

    <style type="text/css">

       body{font:11px arial;}

       #suggest{

                position:absolute;

                background-color:#FFFFFF;

                text-align: :left;

                border: 1px solid #000000;

                display: none;

       }

    </style>

	<script type="text/javascript">

	    function searchSuggest(){

	    	var url="Search";

	    	var txtSearch=$F("txtSearch");

	    	var pars='txtSearch='+txtSearch;

	    	var searchAjax=new Ajax.Request(

	    	      url,

	    	      {

	    	    	 method:'get',  //get方式提交

	    	    	 parameters:pars, //提交参数

	    	    	 onComplete:processRequest

	    	      }

	    	);

	    }

	    function processRequest(req){

	    	var sobj=$("suggest");

	    	sobj.innerHTML="";

	    	var str=req.responseText.split("-");

	    	var suggest="";

	    	if(str.length>0&&str[0].length>0){

                for(i=0;i<str.length;i++){

                	suggest+="<div>"+str[i]+"</div>";

                }

                sobj.innerHTML=suggest;

                $("suggest").style.display="block";

	    	}else{

	    		$("suggest").style.display="none";

	    	}

	    }

	</script>

  </head>

  <body>

       <h3>Ajax自动搜索提示</h3>

       <div style="width:500px">

          <form action="" id="formSearch">

             <input type="text" id="txtSearch" name="txtSearch"  onkeyup="searchSuggest()"autocomplete="off"/>

             <input type="submit" id="cmdSerach" name="cmdSearch" value="搜索"/><br/>

             <div id="suggest" style="width:200px"></div>

          </form>

       </div>

  </body>

</html>

Sevlet类:

package servlet.ajax;

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 Search extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

          request.setCharacterEncoding("UTF-8");

          response.setCharacterEncoding("UTF-8");

          String req=request.getParameter("txtSearch");

          PrintWriter out = response.getWriter();

          SearchDao sd=new SearchDao();

          sd.getText(req);

          StringBuffer sb=sd.getText(req);

          out.print(sb.toString());

          out.flush();

	}

}

进行连接数据库，模糊查询的JAVA类:

package servlet.ajax;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

public class SearchDao {

	public StringBuffer  getText(String req){

		//首先定义下连接数据的URL、用户名、密码

		String url="jdbc:oracle:thin:@127.0.0.1:1521:orcl";

		String user="scott";

		String password="yulei123";

		String sql="select ename from emp a where a.ename like ?";

		if(req.trim().length()==0){

	      sql=sql+" and 1<>1";

		}

		List strList=new ArrayList();

		 try {

			Class.forName("oracle.jdbc.driver.OracleDriver");

			Connection con=DriverManager.getConnection(url,user,password);

			PreparedStatement pre=con.prepareStatement(sql);

			pre.setString(1,"%"+req.toUpperCase().trim()+"%");

			ResultSet rs=pre.executeQuery();

			while(rs.next()){

				String ename=rs.getString("ename");

				strList.add(ename);

			}

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		} catch (SQLException e) {

			e.printStackTrace();

		}

		StringBuffer sb=new StringBuffer();

		int size=strList.size();

		for(int i=0;i<size;i++){

			sb.append((String)strList.get(i)+"-");

		}

		return sb;

	}

}

代码写好后，就可以在文本框输入字母后就可以模糊查询出数据了!

Ajax 模糊查询的简单实现-LMLPHP