1。这里会连接数据库--JDBC的学习实例
一共有3个页面。
2.第一个页面是一个form表单，第二个页面是处理数据，第三个页面是显示页面
vote.jsp
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<body bgcolor="green"> 选择你要投票的人： <form action="vote_end.jsp"> <input type="radio"
name="pp"
value="a"/>周杰伦<img src="img/a.jpg"/> <br><input type="radio"
name="pp"
value="b"/>张 杰<img src="img/b.jpg"/> <br><input type="radio"
name="pp"
value="c"/>范冰冰<img src="img/c.jpg"/> <br><input type="radio"
name="pp"
value="d"/>赵 薇<img src="img/d.jpg"/> <br><input type="radio"
name="pp"
value="e"/>黄晓明<img src="img/e.jpg"/> <br><br><input type="submit"
value="提交"/> </form> </body> |
vote_end2.jsp
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<body bgcolor="red"> <center> <% String sess = request.getSession().getId(); String sess2 = null; out.print("恭喜你，投票成功。<br>"); String pp = request.getParameter("pp"); String people = null; if(pp.equals("a")){ people="‘周杰伦‘"; }else
if(pp.equals("b")){ people="‘张杰‘"; }else
if(pp.equals("c")){ people="‘范冰冰‘"; }else
if(pp.equals("d")){ people="‘赵薇‘"; }else
if(pp.equals("e")){ people="‘黄晓明‘"; } Class.forName("com.mysql.jdbc.Driver"); Connection connection=DriverManager.getConnection("jdbc:mysql://localhost/test?user=root&password=123&useUnicode=true&characterEncoding=gbk"); Statement statement = connection.createStatement(); //查看是否投过票 ResultSet rs2 = statement.executeQuery("SELECT * FROM sess"); while(rs2.next()){ sess2 = rs2.getString("id"); if(sess2.equals(sess)){ %> <jsp:forward page="vote_no.jsp"/> <% } } //查找数据库 ResultSet rs = statement.executeQuery("SELECT * FROM people where name="+people); rs.next(); int
count = rs.getInt("count"); count = count+1; //更新数据库 statement.executeUpdate("UPDATE people SET count="+count+" where name="+people); //投票session号保存到数据库 statement.executeUpdate("insert into sess values(‘"+sess+"‘)"); //显示数据库 ResultSet rss = statement.executeQuery("SELECT * FROM people"); out.print("<table border=1>"); out.print("<tr>"); out.print("<th>姓名</th>"); out.print("<th>票数</th>"); out.print("</tr>"); while(rss.next()) { out.print("<tr>"); out.print("<td>"+rss.getString(1)+"</td>"); out.print("<td>"+rss.getString(2)+"</td>"); out.print("</tr>"); } out.print("</table>"); rs.close(); statement.close(); connection.close(); %> </center> </body> |
vote_end.jsp
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<body bgcolor="red"> <center> <% out.print("恭喜你，投票成功。<br>"); String pp = request.getParameter("pp"); String people = null; if(pp.equals("a")){ people="‘周杰伦‘"; }else
if(pp.equals("b")){ people="‘张杰‘"; }else
if(pp.equals("c")){ people="‘范冰冰‘"; }else
if(pp.equals("d")){ people="‘赵薇‘"; }else
if(pp.equals("e")){ people="‘黄晓明‘"; } Class.forName("com.mysql.jdbc.Driver"); Connection connection=DriverManager.getConnection("jdbc:mysql://localhost/test?user=root&password=123&useUnicode=true&characterEncoding=gbk"); Statement statement = connection.createStatement(); //查找数据库 ResultSet rs = statement.executeQuery("SELECT * FROM people where name="+people); rs.next(); int
count = rs.getInt("count"); count = count+1; //更新数据库 statement.executeUpdate("UPDATE people SET count="+count+" where name="+people); //显示数据库 ResultSet rss = statement.executeQuery("SELECT * FROM people"); out.print("<table border=1>"); out.print("<tr>"); out.print("<th>姓名</th>"); out.print("<th>票数</th>"); out.print("</tr>"); while(rss.next()) { out.print("<tr>"); out.print("<td>"+rss.getString(1)+"</td>"); out.print("<td>"+rss.getString(2)+"</td>"); out.print("</tr>"); } out.print("</table>"); rs.close(); statement.close(); connection.close(); %> </center> </body> |
java web 程序---投票系统,布布扣,bubuko.com
原文地址：http://www.cnblogs.com/langlove/p/3758254.html
