小弟初学JSP.遇到getProperty和userBean的问题.

duper 2005-03-29 11:52:51

TOMCAT5.08的服务器.
文件放在C:\Tomcat 5.0\webapps\ROOT\ch3目录下.
我做了一个用户注册的表单页面.

页面错误如下:
HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: /ch3/register.jsp(2,0) The value for the useBean class attribute com.jspdev.ch3.TestBean is invalid.
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:150)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1227)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Generator.generate(Generator.java:3272)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:495)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:476)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:464)
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)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.30 logs.

代码如下:

_________________________

TestBean.java

_________________________

package com.jspdev.ch3;

public class TestBean
{
public String userName;
public String password;
public int age;

public void setUserName(String name)
{
this.userName=name;
}
public void setPassword(String password)

{
this.password=password;
}
public String getUserName()
{
return this.userName;
}
public String getPassword()
{
return password;
}
public int getAge()
{
return this.age;
}
public void setAge(int age)
{
this.age=age;
}
}

_________________________

register.html
_________________________

<html>
<body>
用户信息注册：<br><hr>
<form method="get" action="register.jsp">
<table>
<tr><td>姓名：<input name="userName" type="text"></td></tr>
<tr><td>密码：<input name="password" type="password"></td></tr>
<tr><td>年龄:<input name="age" type="text"></td></tr>
<tr><td><input type=submit value="submit"></td></tr>
</table>
</form>
</body>
</html>

_________________________

register.jsp
_________________________

<%@ page contentType="text/html;charset=gb2312"%>
<jsp:useBean id="user" scope="page" class="com.jspdev.ch3.TestBean"/>
<jsp:setProperty name="user" property="*"/>
<html>
<body>
注册成功：<br>
<hr>
使用bean属性方法：<br>
用户名：<%=user.getUserName() %><br>
密码：<%=user.getPassword() %><br>
年龄：<%=user.getAge()%><br>
<hr>
使用getProperty:<br>
用户名：<jsp:getProperty name="user" property="userName"/><br>
密码：<jsp:getProperty name="user" property="password"/><br>
年龄：<jsp:getProperty name="user" property="age"/><br>
</body>
</html>

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