Ajax 模糊查询的简单实现

ゞ浴缸里的玫瑰 2022-09-20 00:21 169阅读 0赞

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"  οnkeyup="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!

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[SouthEast]: /images/20220828/436c6d8129d04753a44165de6fa4aecf.png