怎样使用标签和strust区别在一个form中的2个按钮的行为
前台代码：
<html:form action= "/testAction.do " method= "post ">
.........
<html:submit property= "action " value= "增加 ">
<bean:message key= "button.add "/> </html:submit>
<div align= "center "> </div> </td>
<td height= "25 "> <div align= "center ">
<html:submit property= "action " value= "修改 ">
<bean:message key= "button.updata "/> </html:submit>
</div> </td>
testAction的代码：
package ems.struts;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.LookupDispatchAction;
public class testAction extends LookupDispatchAction {
protected Map getKeyMethodMap()
{
HashMap map=new HashMap();
map.put( "button.add ", "add ");//button.delete,按钮的 message key
map.put( "button.update ", "update ");
return map;
}
public ActionForward add(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
{
System.out.println( "add ");
return null;
}
public ActionForward update(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
{
System.out.println( "updata ");
return null;
}
}
配置文件 :::的代码：
<action parameter= "action " path= "/testAction " type= "ems.struts.testAction ">
<forward name= "plan_eng_reg " path= "/Basic_Data/plan_eng_reg.jsp " />
在资源文件ApplicationResources.properties中
button.add=add
button.updata=updata
在运行时出现如下错误！
javax.servlet.jsp.JspException: Cannot retrieve definition for form bean null on action /testAction.do
at org.apache.struts.taglib.html.FormTag.lookup(FormTag.java:731)
at org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:419)
at jsp_servlet._basic_data.__plan_eng_reg._jspService(__plan_eng_reg.java:305)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1072)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:465)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:348)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6981)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3892)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2766)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)
[解决办法]
在你的form中查看一下是否有action这个变量
[解决办法]
form 有没有定义testAction使用的form？
[解决办法]
在struts-config.xml配置文件中为action定义一个formbean啊，如
<form-bean name= "testForm " type= "xxx ">
<form-property name= " " type= " "/>
</form-bean>
<action
name= "testForm "
path= "/testAction "
type= "ems.struts.testAction "
parameter= "action ">
<forward name= "plan_eng_reg " path= "/Basic_Data/plan_eng_reg.jsp " />
</action>
[解决办法]
配置文件 :::的代码：
<action parameter= "action " path= "/testAction " type= "ems.struts.testAction ">
<forward name= "plan_eng_reg " path= "/Basic_Data/plan_eng_reg.jsp " />
改为:
<action parameter= "action " path= "/testAction " name= "testActionForm " type= "ems.struts.testAction ">
<forward name= "plan_eng_reg " path= "/Basic_Data/plan_eng_reg.jsp " />
