DispatchAction提交问题

一、问题：在struts1.2提交form表单时，报错！

 

1、jsp中功能描述：

 

<form action="login.do?method=updata">

.......

    <input type="submit" value="更新"/>

</form>

 

2、struts-config.xml中描述：

 

<action path="/login"

  name="personForm"

  scope="request"

  parameter="method"

  type="org.springframework.web.struts.DelegatingActionProxy"

  >

 

3、MyEclipse控制台异常描述：

 

2009-9-17 9:31:42 org.apache.catalina.core.StandardWrapperValve invoke

严重: Servlet.service() for servlet action threw exception

javax.servlet.ServletException: Request[/login] does not contain handler parameter named 'method'.  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.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106)

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:617)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)

at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)

at java.lang.Thread.run(Thread.java:595)

 

二、解决方案：

 

    确保配置无误后，在form提交时必须以“POST”方式提交，所以将提交方式改为：

 

    <form action="login.do?method=updata" method="post">

 

 这样问题就得以解决。

 

 

三、附加：根据异常信息：javax.servlet.ServletException: Request[/login] does not contain handler parameter named 'method'. This may be caused by whitespace in the label text.

此句翻译：提交参数那里可能某个标签有空格。

 

1、所以如果是以下这种情况也能发生同样错误信息:

 

<form action="login.do?（空格）method=updata" method="post">

或

<form action="login.do?method（空格）=updata" method="post">

//注意：（空格）表示一个空格，这样就报上边的异常了。（估计是该异常信息就描述的是此种情况）

 

2、其次：如果是<form action="（空格）login.do?method=updata" method="post">

          或

         <form action="login.do?method=updata（空格）" method="post">都没问题。

 

3、如果这样<form action="login.do?method=（空格）updata" method="post">

那么就会报：java.lang.NoSuchMethodException: com.summer.actions.PersonAction. updata(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

//找不到方法