一个struts例子的问题

feifei32 2005-08-07 07:56:47
本人刚开始学struts,各位前辈不要见笑，做了一个例子，各位大虾帮我看看
----------------------------------------------------------------
//login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>

<html:html>
<head>
<title>
登陆界面
</title>
</head>
<body>
<p><bean:message key="hello.welcome" />

<logic:present name="personbean" scope="request" >
<p><bean:write name="personbean" property="username" />
<p><bean:write name="personbean" property="loginpass" />
</logic:present>

<p>
<html:form action="/login.do" focus="username">
<html:text property="username" size="16" maxlength="16" />
<html:hidden property="pass" />
<html:reset value="reset" />
<html:submit value="submit" />
</html:form>

</body>
</html:html>
----------------------------------------------------------------
//logerror.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>

<html:html>
<head>
<title>
登陆失败
</title>
</head>
<body>
<p><bean:message key="hello.error">
<p>
<html:errors/>

</body>
</html:html>
----------------------------------------------------------------
//loginAction.java
package login;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;


public final class loginAction extends Action
{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception
{
String loginname = "zhangsuwen";
ActionMessages errors = new ActionMessages();
String username=(String)((loginform)form).getusername();
String pass=(String)((loginform)form).getpass();
loginbean lbn = new loginbean();

if(!username.equalsIgnoreCase(loginname))
{
errors.add( "username" , new ActionMessage("hello.wronguser" , loginname ));
return (new ActionForward(mapping.getInput())); //????
}
else
{
lbn.settemppass(pass);
if(lbn.check())
{
lbn.setusername("zhangsuwen");
request.setAttribute("personbean",lbn);
return (mapping.findForward("????"));
}
else
{
errors.add( "pass" , new ActionMessage("hello.wrongpass" , "bad pass"));
return (new ActionForward(mapping.getInput()));
}

}


}


}
----------------------------------------------------------------
//loginform.java
package login;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;

public final class loginform extends ActionForm
{
private String username=null;

public void setusername(String u)
{
username=u;
}

public String getusername()
{
return username;
}

private String pass=null;

public void setpass(String pas)
{
pass=pas;
}

public String getpass()
{
return pass;
}

public void reset(ActionMapping mapping,HttpServletRequest request)
{
this.username=null;
this.pass=null;
}

public ActionErrors validate(ActionMapping mapping,HttpServletRequest request)
{
ActionErrors errors=new ActionErrors();

if((username==null)||(username.length()<1))
{
errors.add("username",new ActionMessage("hello.nouser"));
}
return errors;
}

}
----------------------------------------------------------------
//loginbean.java
package login;
public class loginbean
{
String username = "";
String loginpass = "1234";
String temptpass;

public void setusername(String name)
{
username = name;
}
public void settemppass(String temppass)
{
temptpass = temppass;
}

public boolean check()
{
if(loginpass.equalsIgnoreCase(temptpass))
return true;
else
return false;
}

}
----------------------------------------------------------------
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fenfan8526 2005-08-08
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1。<load-on-startup>2</load-on-startup>没加
2。<taglib>不全
3。loginpass没有get方法
大河V5 2005-08-08
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1、<message-resources parameter="login.loginre"/>
改成<message-resources parameter="loginre.properties"/>
2、<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
加上html和logic的taglib

feifei32 2005-08-08
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自己顶
fenfan8526 2005-08-07
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顶
fenfan8526 2005-08-07
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我按你说的改了，还是一样的错误
yangbc 2005-08-07
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累,我不用标签,看不懂,不过struts没什么难度，struts-config中你没有把action form绑定到相应的action上阿
feifei32 2005-08-07
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----------------------------------------------------------------
//struts-config.xml
<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">

<struts-config>
<form-beans>
<form-bean name="loginform" type="login.loginform" />
</form-beans>

<action-mappings>
<action path="/login"
type="login.loginAction"
name="loginaction"
scope="request"
validate="true"
input="/logerror.jsp"
>
<forward name="sayhello" path="login.jsp">
</action>

</action-mappings>

<message-resources parameter="login.loginre"/>
</struts-config>
----------------------------------------------------------------
//web.xml
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
</servlet>

<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>

<error-page>
</error-page>

<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>

</web-app>
----------------------------------------------------------------
//loginre.properties
#login.jsp,logerror.jsp
hello.welcome = 欢迎来到这里
hello.error = you are wrong man
hello.nouser = the username is null
hello.wronguser = the username is not zhangsuwen
hello.wrongpass = the password is incerect
----------------------------------------------------------------
目录结构：
loginapp｜logerror.jsp
login.jsp
META-INF
src
WEB-INF | struts-bean.tld
struts-config.xml
struts-html.tld
struts-logic.tld
struts-nested.tld
struts-tiles.tld
classes | login | loginAction.class
loginbean.class
loginform.class
loginre.properties

lib | commons-beanutils.jar
commons-collections.jar
commons-digester.jar
commons-fileupload.jar
commons-logging.jar
commons-validator.jar
jakarta-oro.jar
struts.jar

运行环境为：
Apache Tomcat 5.0.24

出错提示：
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
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:346)
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:810)


root cause

java.lang.NullPointerException
org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1219)
org.apache.struts.taglib.TagUtils.message(TagUtils.java:1082)
org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:226)
org.apache.jsp.login_jsp._jspx_meth_bean_message_0(login_jsp.java:157)
org.apache.jsp.login_jsp._jspx_meth_html_html_0(login_jsp.java:123)
org.apache.jsp.login_jsp._jspService(login_jsp.java:88)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:298)
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:810)

请各位大虾指正，谢谢！
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