JSP Javabean生成错误
[英]JSP Javabean generating Error
问题描述
我有一个类似下面的代码，其中变量名称和Javabean用于变量
package Model;
public class SampleServ
{
private String Name;
public String getName()
{
return Name;
}
public void setName(String name)
{
Name = name;
}
}
我创建了一个JSP文件，并使用Javabean将Value设置如下
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="Model.SampleServ" %>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="objUsers" class="Model.SampleServ"></jsp:useBean>
<jsp:setProperty property="Name" name="objUsers" value="Mugil"/>
<jsp:getProperty property="Name" name="objUsers"/>
</body>
</html>
现在页面显示以下消息，如下所示
Feb 12, 2013 12:32:28 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/JSTL] threw exception [Cannot find any information on property 'Name' in a bean of type 'Model.SampleServ'] with root cause
org.apache.jasper.JasperException: Cannot find any information on property 'Name' in a bean of type 'Model.SampleServ'
at org.apache.jasper.runtime.JspRuntimeLibrary.getReadMethod(JspRuntimeLibrary.java:797)
at org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1062)
at org.apache.jasper.compiler.Node$GetProperty.accept(Node.java:1126)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
at org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
at org.apache.jasper.compiler.Generator.generate(Generator.java:3474)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:249)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:372)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:352)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:339)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:594)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:344)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
c
为什么会这样。
谢谢回复
2 个解决方案
解决方案1
1 2013-02-12 06:50:06
您媒体资源的名称是“名称”，而不是“ propertyName”
顺便说一句，您并没有遵循标准的Java命名约定。 字段应使用camelCase定义，并且应为私有。 即private String name; 而不是public String Name;
解决方案2
0 已采纳 2013-02-12 06:51:27
尝试阅读printStackTrace消息，它清楚地表明Cannot find any information on property 'propertyName' in a bean of type 'Model.SampleServ'
在此行<jsp:setProperty property="propertyName" name="objUsers" value="Mugil"/>您已使用property =“ propertyName ”，它应该是您在SampleServ内部可用的属性名称，因此请使用property=¨Name¨并尝试遵循bean属性的命名约定
编辑 ：
SampleServ.java
public class SampleServ
{
private String name;
public String getName()
{
return name;
}
public void setName(String name)
{
name = name;
}
}
在您的jsp页面中，将<jsp:setProperty property="propertyName" name="objUsers" value="Mugil"/>替换为
<jsp:setProperty property="name" name="objUsers" value="Mugil"/>
JavaBean Servlet Jsp分页
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