使用Struts时,遇到的问题:does not contain handler parameter named method . this may be caused by whitespace in the label text.异
我做的一个报表系统现在是试运行阶段:
之前是没有什么问题的.
但是 最近我看到 Tomcat的 logs文件里面记录了这样的异常:
javax.servlet.ServletException: Request[/B201] does not contain handler parameter named 'action '. This may be caused by whitespace in the label text.
at org.apache.struts.actions.DispatchAction.unspecified(DispatchAction.java:222)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:256)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:194)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at com.wedz.struts.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:21)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
我在网上查过,有几种说法:
一种是说:出现（does not contain handler parameter named 'method '. This may be caused by whitespace in the label text.）的问题,是在表单FROM里如果把POST和GET搞错了会有这种错误
另一种是说:出现这个异常的原因是，jsp页面上配置了如下的句子：
<html:hidden property=“method“ value....>
这2种说法 都没有说原因.
我的 JSP文件里是这样的:
<form name= "B201Form " method= "post " action= "/.... ">
<input name= "action " value= "pass " type= "hidden " />
......
<input type= "submit " name= "Submit " value= "pass " onClick= "set( 'pass ') " />
<input type= "submit " name= "Submit " value= "toExcel " onClick= "set( 'toExcel ') "/>
我为了 让一个表单实现多个功能 ,所以用JS改变 表单提交是的 action 动作.
JS代码:
function set( target){
var form = document.forms[0];
form.action.value=target;
}
配置文件:
<action path= "/... "
type= "com..... "
name= "B201Form "
parameter= "action "
scope= "request "
validate= "false " ...
在Action类里面确实有 'pass '和 'toExcel '方法.
我之前测试这个系统的时候 没有遇到过这样的问题 但是现在在客户那里试运行了,我在logs 文件里面看到有这样的问题,却找不出是什么原因(不知道是不是因为现在用的人多了).
虽然客户那边没有反映这个问题(可能是这个问题出现的次数不是很多,有的用户懒得反映,他们也不知道怎么反映吧),但问题确实是存在的,想找出原因,希望大家帮帮忙!
[解决办法]
可能是js和button的动作冲突了。
<input type= "submit " name= "Submit " value= "toExcel " onClick= "set( 'toExcel ') "/>
这里，既提交了表单，又想改变action域的值,你确定提交表单动作是在改变域值之后么？
建议楼主这样写：
<input type= "button " name= "Submit " value= "toExcel " onClick= "set( 'toExcel ') "/>
function set( target){
var form = document.forms[0];
form.action.value=target;
document.forms[0].submit();
}
