我是jsp的新手，有一个关于jsp和bean的问题。
我创建了以下java文件作为bean，编译它并将java和类文件保存在 C：\ Program Files \ Apache Software Foundation \ Tomcat 7.0 \ webapps \ jspfiles \ WEB-INF \ classes < / em>文件夹：
package test;
public class Hello
{
private String str;
public void setStr (String value)
{
str = value;
}
public String getStr ()
{
return str;
}
}
我的jsp文件test.jsp，包含以下代码，位于 C：\ Program Files \ Apache Software Foundation \ Tomcat 7.0 \ webapps \ jspfiles 文件夹中。
<!DOCTYPE html>
<%@ page contentType="text/html;charset=windows-1252"%>
<jsp:useBean id="test" class="test.Hello" scope="session"/>
当我打开test.jsp文件（http：// localhost：8082 / jspfiles / test.jsp）时，我收到此错误：
HTTP Status 500 - /test.jsp (line: 4, column: 0) The value for the useBean class attribute test.Hello is invalid.
type Exception report
message /test.jsp (line: 4, column: 0) The value for the useBean class attribute test.Hello is invalid.
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /test.jsp (line: 4, column: 0) The value for the useBean class attribute test.Hello is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:408)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:149)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1234)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1182)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Generator.generate(Generator.java:3490)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.34 logs.
上面有什么问题？
答案 0 :(得分：1)
你有一个名为test的软件包很好。您的类文件应位于与包结构匹配的目录中。在这种情况下，在名为classes的{{1}}下创建一个目录，并在其中放置test。
Hello.class