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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
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效果图如下:
主页面index.html:
Digg
后台servlet:
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.
*/ 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=""; return str; } /** * Initialization of the servlet.
* * @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:
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创新互联。