jsp可以调用静态方法吗

[zcdsunny]

以下是bean：

package wms;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import wms.db.DBTool;

public class DropdownList
{

public static String getUnitList()
{
Statement stms = DBTool.getStatement();
ResultSet rs = null;
String unit_id,unit_name,str_script;

str_script = "";
try
{
rs = stms.executeQuery("select unit_id,unit_name from c_unit_base where type = '3'");
while (rs.next())
{
unit_id = rs.getString("unit_id");
unit_name = rs.getString("unit_name");
str_script += "<OPTION VALUE='"+unit_id.trim()+"'>"+unit_name.trim();
}
} catch (SQLException e)
{
e.printStackTrace();
}
return str_script;
}

public static void main(String arg[])
{
System.out.println("unit:" + getUnitList());
}
}

JSP中是这样调用的：

<jsp:useBean id="wunai" scope="application" class="wms.datalist.DropdownList"/>

以下错误信息：

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: Unable to compile class for JSP

An error occurred at line: 10 in the jsp file: /inorder.jsp

Generated servlet error:
[javac] Compiling 1 source file

F:\jakarta-tomcat-5.0.19\work\Catalina\localhost\kl\org\apache\jsp\inorder_jsp.java:52: ??? wms.datalist ???
wms.datalist.DropdownList wunai = null;
^



An error occurred at line: 10 in the jsp file: /inorder.jsp

Generated servlet error:
F:\jakarta-tomcat-5.0.19\work\Catalina\localhost\kl\org\apache\jsp\inorder_jsp.java:54: ??? wms.datalist ???
wunai = (wms.datalist.DropdownList) _jspx_page_context.getAttribute("wunai", PageContext.APPLICATION_SCOPE);
^



An error occurred at line: 10 in the jsp file: /inorder.jsp

Generated servlet error:
F:\jakarta-tomcat-5.0.19\work\Catalina\localhost\kl\org\apache\jsp\inorder_jsp.java:56: ??? wms.datalist ???
wunai = new wms.datalist.DropdownList();
^



An error occurred at line: 264 in the jsp file: /inorder.jsp

Generated servlet error:
F:\jakarta-tomcat-5.0.19\work\Catalina\localhost\kl\org\apache\jsp\inorder_jsp.java:315: ?????
??? ?? DropdownList
??? ? org.apache.jsp.inorder_jsp
out.print(DropdownList.getUnitList());
^
4 ??


org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:553)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


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


请各位大虾指教，不胜感激，晚上结贴

[zcdsunny]

不好意思，bean里面的确是package wms.datalist;还是不行啊

F:\jakarta-tomcat-5.0.19\work\Catalina\localhost\kl\org\apache\jsp\inorder_jsp.java:52: ???? wms.datalist.DropdownList
??????? F:\jakarta-tomcat-5.0.19\webapps\kl\WEB-INF\classes\wms\datalist\DropdownList.class
?????????? 50.0??? 49.0
?????????????????????????
wms.datalist.DropdownList wunai = null;

在jsp里面不能调用静态类型的方法吗？比如直接调用<%=DropdownList.getUnitList()%>

[xiyuan1999]

jsp里面不能调用静态类型的方法吗？


绝对可以

[ydlchina]

可以

[zcdsunny]

那为什么还是出错呢，class的文件夹也没放错啊

[zcdsunny]

<jsp:useBean id="wunai" scope="application" class="wms.datalist.DropdownList"/ > 去掉之后的错误：

exception

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 263 in the jsp file: /inorder.jsp

Generated servlet error:
[javac] Compiling 1 source file

F:\jakarta-tomcat-5.0.19\work\Catalina\localhost\kl\org\apache\jsp\inorder_jsp.java:306: ?????
??? ?? DropdownList
??? ? org.apache.jsp.inorder_jsp
out.print(DropdownList.getUnitList());
^
1 ??


org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)


难道不是静态类型调用问题？弄了几个小时了，大虾们帮帮忙啦，谢谢！！

[for_cyan]

<jsp:useBean id="wunai" scope="application" class="wms.datalist.DropdownList"/ >

确定你这句没错？我感觉是class="wms.DropdownList"

[neptune0229]

同上,你最前面是package wms;
wms.DropdownList

[zcdsunny]

<%=DropdownList.getUnitList()%>直接这样调用为何不可以阿？

[readykisskis]

当然可以了

[zcdsunny]

但是出错了呀，又不能用import，useBean也不行~郁闷呢

[caiitly]

导入静态类所在的包试试

[bluedn]

静态方法
package com.bluedn.manager.model.bubean;

import com.bluedn.manager.model.vo.UserPermVO;

public class UserBean extends UserPermVO {
	
	public static void GetPerm(long iPermValue) {
		
		SysManage = (iPermValue & 1) > 0;      //系统管理
		Bargain = (iPermValue & 2) > 0;        //合同管理
		BargainAdd = (iPermValue & 4) > 0;     //合同登记
		BargainUpdate = (iPermValue & 8) > 0;  //合同修改
		BargainDel = (iPermValue & 16) > 0;    //合同删除
		BargainQuery = (iPermValue & 32) > 0;  //合同查询
		BargainExport = (iPermValue & 64) > 0; //合同导出
		
	}

}

<%@ page import="com.bluedn.manager.model.vo.UserPermVO"%>
<%
  long iPermValue = Long.parseLong(session.getAttribute("strUserTab").toString());
  UserBean.GetPerm(iPermValue);
%>

[billysky]

你的<%@ page import = "" %> 怎么写的？发上来