轮询查询邮箱

使用jQuery实现邮箱轮询

最新推荐文章于 2025-01-25 06:41:20 发布

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本文介绍了一种利用jQuery的Ajax功能实现邮箱信息轮询的方法。通过每5秒查询后台数据库来更新显示邮件详情，包括发件人、发送时间和内容等关键信息。

一、使用jQuery的Ajax功能，完成轮询邮箱功能。每隔5秒去后台查询数据库，将信息加载到当前页面。
每次查询到的邮件信息包括：发件人、发送时间、邮件内容。
提示：前端可以使用setInterval("getInfo()",5000)完成每5秒,调用getInfo()函数。

1、EmailInfoServlet.java

package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import org.json.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import email.Email;
import util.DBUtil;
@WebServlet(name = "EmailInfoServlet", urlPatterns = { "/emailInfoServlet" })
public class EmailInfoServlet extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
        resp.setHeader("content-type","application/x-www-form-urlencoded");
		resp.setCharacterEncoding("utf-8");
		PrintWriter pw=resp.getWriter();
        List<Email> list=DBUtil.checkInfo();
        JSONArray jsonArray=new JSONArray(list);
   	    String jsonArrayStr=jsonArray.toString();
   	    pw.println(jsonArrayStr);
        pw.flush();
		pw.close();
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doPost(req, resp);
	}
}

2、email.java

package email;

public class Email {
	private String sendName;
	private String time;
	private String content;

	public Email() {
	}

	public Email(String sendName,String time, String content) {
		this.sendName = sendName;
		this.time = time;
		this.content = content;
	}

	public String getSendName() {
		return sendName;
	}

	public void setSendName(String sendName) {
		this.sendName = sendName;
	}

	public String getTime() {
		return time;
	}

	public void setTime(String time) {
		this.time = time;
	}

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

}

3、DBUtil.java

package util;
import java.sql.*;
import java.util.*;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import email.Email;

public class DBUtil {
   private static ComboPooledDataSource ds;
   static{
	   ds=new ComboPooledDataSource();
   }
   
   public static List<Email> checkInfo(){  //查询到邮件信息
	   List<Email> list=new ArrayList<Email>();
	   Connection conn=null;
	   PreparedStatement ps=null;
	   ResultSet rs=null;
	   try {
		   conn=ds.getConnection();
		   String sql="select sendName,time,content from email ";
		   ps=conn.prepareStatement(sql);
		   rs=ps.executeQuery();
	   while(rs.next()){
		   String sendName=rs.getString("sendName");
		   String time=rs.getString("time");
		   String content=rs.getString("content");
		   Email email=new Email(sendName,time,content);
		   list.add(email);
	   }
	} catch (SQLException e) {
		e.printStackTrace();
	}finally{
		try {
			rs.close();
			ps.close();
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	   return list;
   }  
}

4、checkEmail

<%@ page contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>轮询邮箱</title>
<style type="text/css">
  #title{
       width:100px;
       color:red;
  }

</style>
<script type="text/javascript" src="../js/jquery-3.1.1.js"></script>
<script type="text/javascript">
	function getInfo(){
		$.ajax({
			method:"post",
			url:"/AjaxProject/emailInfoServlet",
		    success:function(data){	
		    	$("#msg").html(data);	    		    	
		    }
		});
	}
	setInterval("getInfo()",5000); 
</script>
</head>
<body>
   <form action="${pageContext.servletContext.contextPath}/emailInfoServlet" method="post" >
       <div id="title" > 邮件信息</div><br/><br/>
       <span id="msg" style="backgrond-color:yellow" ></span> <br/><br/>
   </form>
</body>
</html>