package com.ibm.ajax.app1.entity;
public class WebUser {
private String uname;
public WebUser(String uname){
this.uname=uname;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
}
package com.ibm.ajax.app1.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.List;
import java.util.Vector;
import com.ibm.ajax.app1.entity.WebUser;
public class WebUserDao {
public List<WebUser> queryList() throws Exception{
String username="gdx";
String password="wazzh";
String url="jdbc:oracle:thin:@//localhost:1521/orcl";
String driver="oracle.jdbc.driver.OracleDriver";
List<WebUser> lists=new Vector<WebUser>();
Class.forName(driver);
Connection conn=DriverManager.getConnection(url, username, password);
Statement stmt =conn.createStatement();
ResultSet rs=stmt.executeQuery("select UNAME from webUser");
while(rs.next()){
WebUser webuser=new WebUser(rs.getString("UNAME"));
lists.add(webuser);
}
return lists;
}
}
package com.ibm.ajax.app1.service.impl;
import java.util.List;
import com.ibm.ajax.app1.dao.WebUserDao;
import com.ibm.ajax.app1.entity.WebUser;
import com.ibm.ajax.app1.service.IWebUserService;
public class WebUserServiceImpl implements IWebUserService {
private WebUserDao webuserdao= new WebUserDao();
@Override
public List<WebUser> getWebUserList() throws Exception {
List<WebUser> lists= webuserdao.queryList();
return lists;
}
}
package com.ibm.ajax.app1.service;
import java.util.List;
import com.ibm.ajax.app1.entity.WebUser;
public interface IWebUserService {
//获取我建立的实体对象WebUser的list表
public List<WebUser> getWebUserList() throws Exception;
}
package com.ibm.ajax.app1.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.ibm.ajax.app1.entity.WebUser;
import com.ibm.ajax.app1.service.IWebUserService;
import com.ibm.ajax.app1.service.impl.WebUserServiceImpl;
/**
* Servlet implementation class ValiateUserNameServlet
*/
public class ValiateUserNameServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private IWebUserService webuserservice;
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
webuserservice = new WebUserServiceImpl();
try{
List<WebUser> userNames=webuserservice.getWebUserList();
System.out.println(userNames);
//这之上的是写的从数据库调取的语句
String userName=request.getParameter("userName");
String result=null;
if(userNames.contains(userName) ){
result="<font color='red'>该用户已存在</font>";
}
else{
result="<font color='green'>该用户不存在</font>";
}
System.out.println("sdf");
response.setContentType("text/html ; charset=UTF-8");
response.setCharacterEncoding("UTF-8");
response.getWriter().print(result);
}
catch(Exception ex){
System.out.println(ex);
}
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath }/scripts/jquery-1.7.2.js "></script>
<script type="text/javascript">
$(function(){
$(":input[name='username']").change(function(){
var val=$(this).val();
val=$.trim(val);
if(val!=" "){
var url="${pageContext.request.contextPath }/valiateUserName";
var args={"userName":val,"time":new Date()};
$.post(url,args,function(data){
$("#message").html(data);
});
}
});
})
</script>
</head>
<body>
<form action="" method="post">
UserName:<input type="text" name="username" />
<div id="message"></div>
<input type="submit" value="Submit" />
</form>
</body>
</html>
