您所在位置：主题：关于bean的一个问题,请高手帮忙
zouqm2005
[专家分：20] 发布于 2007-08-23 16:26:00
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@ import="JBeans.GuessNumber"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<%
int n=(int)(Math.random()*100)+1;
%>
<jsp:useBean id="guess" class="JBeans.GuessNumber" scope="session"></jsp:useBean>
<jsp:setProperty name="guess" property="answer" value="<%=n%>"/>
<p>give you a number,please guess it</p>
<p>
<%
String str=response.encodeRedirectURL("guess.jsp");
%>
</p>
<form name="form1" method="post" action="<%=str%>">
<p>input your number</p>
<p>
<input name="guessNumber" type="text" >
<input type="submit" name="Submit" value="提交">
</p>
<p> </p>
</form>
<p> </p>
</body>
</html>
bean:
package JBeans;
public class GuessNumber
{
int answer=0;
int guessNumber=0;
int guessCount=0;
String result=null;
public void setAnswer(int n)
{
answer=n;
guessCount=0;
}
public int getAnswer()
{
return answer;
}
public void setGuessNumber(int m)
{
guessNumber=m;
guessCount++;
if(guessNumber==answer)
result="congratulation,you are right";
else if(guessNumber>answer)
result="It`s high than the right number";
else if(guessNumber<answer)
result="It`s low than the right number";
}
public int getGuessNumber()
{
return guessNumber;
}
public int getGuessCount()
{
return guessCount;
}
public String getResult()
{
return result;
}
}
错误提示
org.apache.jasper.JasperException: /getNumber.jsp(2,4) Invalid directive
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:90)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:506)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1539)
org.apache.jasper.compiler.Parser.parse(Parser.java:126)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:220)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:203)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
<%@ import="JBeans.GuessNumber"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<%
int n=(int)(Math.random()*100)+1;
%>
<jsp:useBean id="guess" class="JBeans.GuessNumber" scope="session"></jsp:useBean>
<jsp:setProperty name="guess" property="answer" value="<%=n%>"/>
<p>give you a number,please guess it</p>
<p>
<%
String str=response.encodeRedirectURL("guess.jsp");
%>
</p>
<form name="form1" method="post" action="<%=str%>">
<p>input your number</p>
<p>
<input name="guessNumber" type="text" >
<input type="submit" name="Submit" value="提交">
</p>
<p> </p>
</form>
<p> </p>
</body>
</html>
bean:
package JBeans;
public class GuessNumber
{
int answer=0;
int guessNumber=0;
int guessCount=0;
String result=null;
public void setAnswer(int n)
{
answer=n;
guessCount=0;
}
public int getAnswer()
{
return answer;
}
public void setGuessNumber(int m)
{
guessNumber=m;
guessCount++;
if(guessNumber==answer)
result="congratulation,you are right";
else if(guessNumber>answer)
result="It`s high than the right number";
else if(guessNumber<answer)
result="It`s low than the right number";
}
public int getGuessNumber()
{
return guessNumber;
}
public int getGuessCount()
{
return guessCount;
}
public String getResult()
{
return result;
}
}
错误提示
org.apache.jasper.JasperException: /getNumber.jsp(2,4) Invalid directive
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:90)
org.apache.jasper.compiler.Parser.parseDirective(Parser.java:506)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1539)
org.apache.jasper.compiler.Parser.parse(Parser.java:126)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:220)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:203)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)