jsp和bean实现猜价格的小游戏
通过<jsp:useBean id="" class="" scope="session"> 来设置成session属性 使得可以取得上次的值 代码如下：
GuestGame.java
package bean;
import java.util.Random;
public class GuestGame
{
int answer;
int guess;
boolean success ;
String info;
int counter;
public GuestGame()
{
reset();
}
public int getAnswer() {
return answer;
}
public boolean getSuccess() {
return success;
}
public String getInfo() {
return info;
}
public int getCounter() {
return counter;
}
public void reset()
{
answer=Math.abs(new Random().nextInt()&1000)+1;
success=false;
counter=0;
}
/**
* set 和get方法只能出现一个
* 否则会出错的
* @param guess
*/
public void setGuess(String guess)
{
counter++;
try
{
this.guess=Integer.parseInt(guess);
}catch(Exception e)
{
this.guess=-1;
}
if(this.guess==answer)
{
this.success=true;
}
else if(this.guess==-1)
{
this.info="出错了";
}
else if(this.guess<answer)
{
this.info="你猜的价格低了";
}
else if(this.guess>answer)
{
this.info="你猜的价格高了";
}
if(this.guess>1000)
{
this.info="价格在1000之内";
}
}
}
2.index.jsp
<%@page contentType="text/html;charset=GBK"%>
<%@page import="bean.GuestGame"%>
<%%>
<html>
<jsp:useBean id="game" class="bean.GuestGame" scope="session"></jsp:useBean>
<jsp:setProperty name="game" property="*"/>
<%
if(game.getCounter()==0)
{
%>
<form method=get>
输入价格<input type="text" name="guess">
<input type="submit" value="提交">
</form>
<%
}
else if (game.getSuccess()==true)
{
%>
<center>您猜对了！</center><br>
<center><a href="index.jsp" mce_href="index.jsp">再猜一次</a></center>
<%
game.reset();
