JSP学习笔记(七)-----猜数字游戏

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;
}
public void reset() {
answer = Math.abs(new Random().nextInt() % 100) + 1;
success = false;
numGuesses = 0;
}
}