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：

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!