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服务器之家 - 编程语言 - JAVA教程 - 教大家使用java实现顶一下踩一下功能

教大家使用java实现顶一下踩一下功能

2021-04-04 14:34上天入地 JAVA教程

这篇文章主要教大家如何使用java实现顶一下踩一下功能，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了java实现顶一下踩一下功能的具体代码，供大家参考，具体内容如下

效果图如下：

教大家使用java实现顶一下踩一下功能

主页面index.html:

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Digg</title>
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
<script type="text/javascript">
 
$(function(){ getdigshtml();})
 
 
function isdigs(digtype)//顶一下，踩一下操作
{
    $.ajax({  
    type:'POST',
    url:'Digg',
    data:'action=digs&digtype='+digtype,
/*   beforeSend:function(){
      $("#vote").hide();
      $("#loadings").show();
    }, ajax请求显示loading效果*/
    success:function(msg){
        switch (msg)
          {
/*   后台用来判断
              case '1':              
              $("#loadings").hide();
              $("#vote").show(); 
              alert("请先登录！");
              break;
            case '2':              
              $("#loadings").hide();
              $("#vote").show();
              alert("请先下载，再操作！");             
              break;
            case '4':              
              $("#loadings").hide();
              $("#vote").show();
              alert("您已经参与过评价！");             
              break;*/
            case '3':
              getdigshtml();//重新绑定html
              //$("#loadings").hide();
              //$("#vote").show();  
              alert("谢谢你的参与！");
              break;
           
            default:
          }
      }
    }) 
} 
 
function getdigshtml()//获取顶一下，踩一下html
{
  $.ajax({  
    type:'POST',
    url:'Digg',
    data:'action=getdigshtml',
    success:function(msg){
         $("#digg").html(msg);
      }
  }) 
} 
 
</script>
<style type="text/css">
* {
  padding:0;
  margin:0;
}
.digg {
  height: auto;
  width: 190px;
  font-size:12px;
  font-weight:normal;
}
.digg a {
  display: block;
  height: 48px;
  width: 189px;
  background-image: url(images/mark.gif);
  background-repeat: no-repeat;
  position: relative;
  color: #000;
  text-decoration: none;
}
.digg .good {
  margin-bottom:10px;
  margin-top:5px;
}
 
.digg .good a {
  background-position: -189px 0px;
}
.digg .good a:hover {
  background-position: 0px 0px;
}
.digg .bad a {
  background-position: -378px 0px;
}
.digg .bad a:hover {
  background-position: -567px 0px;
}
.digg a p {
  padding-left:30px;
  line-height:25px;
}
.digg .bar {
  background-color: white;
  height: 5px;
  left: 20px;
  overflow: hidden;
  position: absolute;
  text-align: left;
  top: 30px;
  width: 55px;
}
.bar #g_img {
  background-image: url(images/sprites.gif);
  background-repeat: repeat-x;
  height: 5px;
  width: auto;
}
.bar #b_img {
  background-image: url(images/sprites.gif);
  background-repeat: repeat-x;
  height: 5px;
  width: auto;
  background-position: 0px -5px;
}
.num {
  color: #333;
  font: normal normal 100 10px/12px Tahoma;
  left: 80px;
  position: absolute;
  top: 26px;
}
.digg .good .bar {
  border: 1px solid #40A300;
}
.digg .bad .bar {
  border: 1px solid #555;
}
 
</style>
 
<script type="text/javascript">
 
</script>
</head>
 
<body>
<div class="digg" id="digg" style="margin-left: auto;margin-right: auto;">
 
</div>
</body>
</html>

后台servlet:

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package com.test;
 
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.NumberFormat;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class Digg extends HttpServlet {
  private static Connection con = null;
  private static Statement stmt = null;
 
  /**
   * Constructor of the object.
   */
  public Digg() {
    super();
  }
 
  /**
   * Destruction of the servlet. <br>
   */
  public void destroy() {
    super.destroy(); // Just puts "destroy" string in log
    // Put your code here
  }
 
 
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
 
    this.doPost(request, response);
  }
 
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    request.setCharacterEncoding("utf8");
    response.setCharacterEncoding("utf8");
    String action = request.getParameter("action");
    String digtype = request.getParameter("digtype");
    if(action.equals("digs")){
      try {
        response.getWriter().write(dig(digtype));
         
      } catch (Exception e) {
        e.printStackTrace();
      }
    }else if(action.equals("getdigshtml")){
      try {
        response.getWriter().write(getDigHtml());
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  }
  private String dig(String digtype)throws Exception{
    String sql ="";
    if(digtype.equals("digs")){
      sql ="update dig set digs=digs+1 where id =1";
    }else{
      sql ="update dig set undigs=undigs+1 where id =1";
    }
    int num =stmt.executeUpdate(sql);
    if(num>0){
      return "3";
    }
    return "1";
  }
  public static void main(String[] args){ 
    NumberFormat nf = NumberFormat.getPercentInstance(); 
    nf.setMaximumIntegerDigits(4); 
    nf.setMaximumFractionDigits(6); 
    double d = (double)1/(double)7; 
    System.out.println(nf.format(d)); 
    } 
  private String getDigHtml()throws Exception{
    NumberFormat nf = NumberFormat.getPercentInstance(); 
    nf.setMaximumIntegerDigits(3); 
    nf.setMaximumFractionDigits(2); 
     
    String sql ="select * from dig where id=1";
    ResultSet res = stmt.executeQuery(sql);
    double digSum = 0 ;
    double unDigSum =0 ;
    double digSumAll = 0;
    String digPer = "0%";
    String unDigPer = "0%";
    while(res.next()){
      digSum = res.getInt("digs");
      unDigSum = res.getInt("undigs");
    }
    digSumAll = digSum + unDigSum;
    if(digSumAll !=0 ){
      digPer = nf.format(digSum/digSumAll);
      unDigPer = nf.format(unDigSum/digSumAll);
    }
     
    String str="<div class='good'>";
      str+="<a href=JavaScript:isdigs('digs') >";
      str+="<p>很好</p><div class='bar'><div id='g_img' style='width:"+digPer+"'></div></div>";
      str+="<span class='num'>"+digPer+"("+digSum+")</span>";
      str+="</a></div><div class='bad'>";
      str+="<a href=JavaScript:isdigs('undigs') >";
      str+="<p>很差</p><div class='bar'><div id='b_img' style='width:"+unDigPer+"'></div></div>";
      str+="<span class='num'>"+unDigPer+"("+unDigSum+")</span>";
      str+="</a></div>";
   
    return str;
     
  }
  /**
   * Initialization of the servlet. <br>
   *
   * @throws ServletException
   *       if an error occurs
   */
  public void init() throws ServletException {
    try {
      Class.forName("com.mysql.jdbc.Driver");
      con = DriverManager.getConnection(
          "jdbc:mysql://172.16.42.39:3306/dig", "root", "12345678");
      stmt = con.createStatement();
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
 
  }
 
  public void closeCon() {
    try {
      stmt.close();
      con.close();
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
 
  }
}

sql语句：

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CREATE TABLE dig(
 id INT PRIMARY KEY,
 digs INT,
 undigs INT
);
INSERT INTO dig VALUES(1,0,0);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：http://blog.csdn.net/xuweilinjijis/article/details/8880968

  • Java
  • 顶一下
  • 踩一下

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