JSP学习笔记(七)-----猜数字游戏

王朝java/jsp·作者佚名  2006-12-16
窄屏简体版  字體: |||超大  

1. 这是一个猜数字的游戏,通过使用JSP调用JavaBean

2. 需要两个文件,number.jsp和NumberGuessBean.java

3. 先看number.jsp代码:

<html>

<jsp:useBean id="number" class="NumberGuessBean" scope="session" />

<jsp:setProperty name="number" property="*" />

<%

if(number.getNumGuesses()==0)

{

%>

<B>Welcome to the Number Guess game.</B>

<br>

<B>I'm thinking of a number between 1 and 100.</B>

<br>

<b>What's your guess?</b>

<form method=post>

<input type=text name="guess">

<input type=submit value=submit>

</form>

<%

}

else if(number.getSuccess())

{

%>

Congratulations! You got it. And after just <%=number.getNumGuesses()%> tries.

Care to <a href=number.jsp>try again</a>?

<%

number.reset();

}

else

{

%>

Good guess, but nope. Try <%=number.getHint()%>. You have made <%=number.getNumGuesses()%> guesses.

<br>I'm thinking of a number between 1 and 100.

<br>

What's your guess?

<form method=post><input type=text name="guess">

<input type=submit value=submit>

</form>

<%

}

%>

</html>

4. NumberGuessBean.java代码如下:

import java.util.*;

public class NumberGuessBean {

int answer;

boolean success;

String hint;

int numGuesses;

public NumberGuessBean() {

reset();

}

public void setGuess(String guess) {

numGuesses++;

int g;

try {

g = Integer.parseInt(guess);

}

catch (NumberFormatException e) {

g = -1;

}

if (g == answer) {

success = true;

}

else if (g == -1) {

hint = "a number next time";

}

else if (g < answer) {

hint = "higher";

}

else if (g > answer) {

hint = "lower";

}

}

public boolean getSuccess() {

return success;

}

public String getHint() {

return "" + hint;

}

public int getNumGuesses() {

return numGuesses;

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