2007-06-22

Struts2.0 表单中用到select标签提交时出错

关键字: Struts2.0 表单中用到select标签提交时出错
在表单用中到了select标签,页面初始化时一切正常,select也正常初始化
可是当我提交时就出现如下错误:
严重: Servlet.service() for servlet jsp threw exception
tag 'select', field 'list', name 'functions.typeId': The requested list key '%{types}' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]

在应用中我用到两个Action,两个jsp页面

一个FunctionsAction,一个FunctionstypeAction
一个add_function.jsp,一个add_functions_success.jsp

具休流程是我从FunctionstypeAction中获取一个functionstypes的List
用来初始化add_function.jsp中的select标签,
然后把表单提交给FunctionsAction中的insert方法
add_function.jsp初始化是正常的,
但是点提交到FunctionsAction的时候页面空白
我看了一下源文件,页面只执行了一部分,
代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<title>首页</title>
		<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
	</head>
	<body style="text-align:center;">
		
		
		
					
<form id="insertFunction" onsubmit="return true;" action="insertFunction.action" method="post">
<table class="wwFormTable">


下面列出Action,xml配置和jsp页面的代码

FunctionsAction:
package com.mp.job.baseinfo.action;

import java.util.List;

import com.mp.job.baseinfo.service.IFunctionsService;
import com.mp.job.baseinfo.vo.Functions;
import com.mp.job.common.service.JobActionSupport;
import com.mp.job.exception.BaseException;
import com.mp.job.util.Pager;

@SuppressWarnings("serial")
public class FunctionsAction extends JobActionSupport {
	private IFunctionsService functionsService;
	private Functions functions;
	private List functionsRecords;
	@SuppressWarnings("unused")
	private Object[][] params;
	private Pager pager;

         <!-- getter和setter这里省略! -->
	
	public String insert()throws BaseException{
		try{
		functionsService.save(functions);
		}catch(Exception e){
			e.toString();
			addActionMessage("插入数据时出现异常!");
			return INPUT;
		}
		return SUCCESS;
	}
	<!-- 其他的方法省略 -->
		
}


FunctionstypeAction:
package com.mp.job.baseinfo.action;

import java.util.List;

import com.mp.job.baseinfo.service.IFunctionstypeService;
import com.mp.job.baseinfo.vo.Functionstype;
import com.mp.job.common.service.JobActionSupport;
import com.mp.job.exception.BaseException;
import com.mp.job.util.Pager;

@SuppressWarnings("serial")
public class FunctionstypeAction extends JobActionSupport {
	private IFunctionstypeService functionstypeService;
	private Functionstype functionstype;
	private List functionstypes;
	private List functionstypeRecords;
	
	@SuppressWarnings("unused")
	private Object[][] params;
	private Pager pager;

	<!-- getter和setter这里省略! -->
	
	@SuppressWarnings("unchecked")
	public String getAllFunctionstypes()throws BaseException{
			functionstypes = functionstypeService.findAll();
			return null;
	}
		
	<!-- 其他方法这里省略! -->

	public List getFunctionstypes() {
		return functionstypes;
	}

	public void setFunctionstypes(List functionstypes) {
		this.functionstypes = functionstypes;
	}
	
}


struts.xml --->>>其中用到的Action我都在Spring中配置过了
<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<!-- ================================================================== -->
	<!--                   名称相关functionsAction                                -->
	<!-- ================================================================== -->
	<package name="functions" namespace="/admin/BaseInfo"
		extends="struts-default">
		<action name="insertFunction" class="functionsAction"
			method="insert">
			<result name="success">search_Functions.jsp</result>
			<result name="input">add_function.jsp</result>
		</action>
           <!-- 其他配置省略 -->
	</package>
	<!-- ================================================================== -->
	<!--                   类型相关Action                                -->
	<!-- ================================================================== -->
	<package name="functionstype" namespace="/admin/BaseInfo"
		extends="struts-default">
		<action name="getAllFunctionstypes" class="functionstypeAction"
			method="getAllFunctionstypes">
		</action>
           <!-- 其他配置省略 -->
	</package>
</struts>


add_function.jsp:  --->>>就这个页面害我两天没睡好觉
<%@page language="java" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<title>首页</title>
		<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
	</head>
	<body style="text-align:center;">
		<s:actionmessage />
		<s:action name="getAllFunctionstypes" id="getAllFunctionstypes" />
		<s:set name="types" value="#getAllFunctionstypes.functionstypes"/>
		<s:form action="insertFunction.action" method="post">
			<s:select list="%{types}"
					  listKey="id"
					  listValue="name"
					  name="functions.typeId"
					  label="类型"/>
			<s:textfield name="functions.name" label="名称"/>
			<s:submit value="添加"/>
		</s:form>
		<hr/>
	</body>
</html>


add_function_success.jsp: --->>>这个页面很简单,个人认为错误不会出在这里,呵呵
<%@page language="java" pageEncoding="utf-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
		<title>首页</title>
		<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
	</head>
	<body style="text-align:center;">
		<table width="350px" height="150px" align="center" bgcolor="#ffff00">
			<tr><td style="color:#00ff00;"><b>成功添加数据!</b><br/><br/>
				<a href="add_function.jsp">继续添加</a>    <a href="listAllFunctions.action">查看全部</a>
			</td></tr>
		</table>
	</body>
</html>


我现在的感觉是List是不是只能从同一个Action中调出,也只能提交到同一个Action????
评论
xinlcao 2007-08-26
这个错误应该是由于提交的时候,校验出错,返回到提交页面,然后这个时候是直接返回到jsp页面,action没有执行,造成取list的时候没有值,当然不用校验就不会出错了,看看你的校验代码,或者修改action类就行了。

引用

FunctionstypeAction:


代码
package com.mp.job.baseinfo.action;

import java.util.List;

import com.mp.job.baseinfo.service.IFunctionstypeService;
import com.mp.job.baseinfo.vo.Functionstype;
import com.mp.job.common.service.JobActionSupport;
import com.mp.job.exception.BaseException;
import com.mp.job.util.Pager;

@SuppressWarnings("serial")
public class FunctionstypeAction extends JobActionSupport {
private IFunctionstypeService functionstypeService;
private Functionstype functionstype;
private List functionstypes;
private List functionstypeRecords;

@SuppressWarnings("unused")
private Object[][] params;
private Pager pager;

<!-- getter和setter这里省略! -->

@SuppressWarnings("unchecked")
public String getAllFunctionstypes()throws BaseException{
functionstypes = functionstypeService.findAll();
return null;
}

<!-- 其他方法这里省略! -->

public List getFunctionstypes() {
return functionstypes;
}

public void setFunctionstypes(List functionstypes) {
this.functionstypes = functionstypes;
}

}


修改成:
    //public String getAllFunctionstypes()throws BaseException{   
     //       functionstypes = functionstypeService.findAll();   
     //       return null;   
    //}   
           
    <!-- 其他方法这里省略! -->   
  
    public List getFunctionstypes() {   
        return functionstypeService.findAll();      
    }   
  
    //public void setFunctionstypes(List functionstypes) {   
    //    this.functionstypes = functionstypes;   
    //} 
linyuelei 2007-06-26
<action name="getAllFunctionstypes" class="functionstypeAction"method="getAllFunctionstypes">
<interceptor-ref name="basicStack"/>
</action>
linyuelei 2007-06-26
妈的,终于搞定了加上拦截器<interceptor-ref name="basicStack"/>就可以了出来。
linyuelei 2007-06-26
我页碰到了这个问题,好几天了都没解决!
能具体的说下验证文件那出问题了?我的邮件linyl@pominfo.cn
期待回复。谢谢!
soardragon 2007-06-24
谢谢你的建议
问题已经解决,就是验证文件的问题,
让我恼的差点砸电脑,
不过问题过去了,感觉select还是满有用的,呵呵...
yidishui 2007-06-24
我觉得很有可能是
<s:action name="getAllFunctionstypes" id="getAllFunctionstypes" /> 
里面加了不合适的拦截器,特别象验证的拦截器,这样你在form提交的时候 却没有验证成功造成的
我在webwork中刚开始也遇到同样的问题
soardragon 2007-06-23
movingboy 多谢你的回答!
今天把action包中的一个验证配置给删了,结果就正常了,
顺便问一个
如果Action的验证配置没有起别名的话是不是会过滤掉所有的东西?
我删的那个配置文件是xxxAction-validation.xml
如果我要针对insert方法过滤是不是要这样写
xxxAction-insert-validation.xml?
movingboy 2007-06-23
在JSP中不使用<s:set>标签,直接按下面写试试:

<%@page language="java" pageEncoding="utf-8"%>  
<%@taglib prefix="s" uri="/struts-tags"%>  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
    <head>  
        <title>首页</title>  
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  
    </head>  
    <body style="text-align:center;">  
        <s:actionmessage />  
        <s:action name="getAllFunctionstypes" id="getAllFunctionstypes" />  
        <s:form action="insertFunction.action" method="post">  
            <s:select list="#getAllFunctionstypes.functionstypes"  
                      listKey="id"  
                      listValue="name"  
                      name="functions.typeId"  
                      label="职能类型"/>  
            <s:textfield name="functions.name" label="职能名称"/>  
            <s:submit value="添加"/>  
        </s:form>  
        <hr/>  
    </body>  
</html>


另外说一句:list是可以从其它action中取的,我曾经用过这种办法;但提交只能到同一个action
soardragon
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