最近在做struts2的时候，老是碰见这样一个令人吐血的bug。 

 

警告: Could not find action or result
No result defined for action org.action.StrutsAction and result success
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:375)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)


 

在网上寻了很久，查了很多资料，终于找到了自己错误的原因。实际上都是一个边边角角的错误，或是系统不兼容的错误。

我的struts.xml的配置文件

 

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

	<package name="default" extends="struts-default">
		<action name="struts" class="org.action.StrutsAction">
			<result name="success">/welcome.jsp</result>
			<result name="error">/hello.jsp</result>
			
		</action>
	</package>
</struts>   



还有hello.jsp和welcome.jsp文件

 

 

<%@ page language="java" pageEncoding="utf-8"%>
<!-- 导入标签开发能力 -->
<%@ taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<title>struts 2应用</title>
</head>
<body>
	<s:form action="struts.action" method="post">
		<s:textfield name="name" label="请输入姓名"></s:textfield>
		<s:submit value="提交"></s:submit>
	</s:form>
</body>
</html>


 

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
    <title>struts 2应用</title>
</head>
<body>
   	hello <s:property value="#request.name"/>!
</body>
</html>




最后就是StrutsAction文件

 

 

package org.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class StrutsAction extends ActionSupport{
	private String name;

	public String getName() {
		return name;
	}
	public String execute() throws Exception{
		if(!name.equals("HelloWorld")){
			Map request1=(Map)ActionContext.getContext().get("request");  
			request1.put("name",getName());  
			return SUCCESS;   
		}else{
			return ERROR;
		}
	}
}






出现错误后，笔者对其中的jar包以及配置文件进行了详细的检查

 

　　问题就出现在了struts.xml这个文件上，网上说当在struts.xml文件中的action的 name属性要选择其他的字符串定义，不要占用了struts2的关键字-------“struts”。当然为什么会这样，笔者也不大了解，可能是规定吧。

　　可改了之后，问题依然存在，后来在网上发现了原因，就是jsp中的form表单中的代码，确认form表单的action和struts.xml中的action相对应。就是form中的action=“abc”，则struts.xml中<action name="abc">，这两者要相同。

       改正之后，程序终于可能正确的运行了。 

 

--------------------------------------------------------------------------------------------------------------------------------------------------------------

 

你可以直接在那个action里面 

如



<result name="success">/index.jsp</action>

可以那他改成

<result name="success" type="redirect">*****.action</action>

我的例子：

 <action name="index" class="struts2.action.GainInformation" >  
            <result name="gain1_success" >/index.jsp</result>
            <result name="gain1_fail">/index.jsp</result>
 </action>  



      <action name="login" class="struts2.action.LoginAction">
            <result name="success" type="redirect">index.action</result>
            <!-- <result name="login_success">/index.jsp</result> -->
            <result name="login_fail">/login.jsp</result>
        </action>

一共有三种方式redirect,redirect-action,chain
区别如下
1 redirect:action处理完后重定向到一个视图资源（如：jsp页面），请求参数全部丢失，action处理结果也全部丢失。

2 redirect-action:action处理完后重定向到一个action，请求参数全部丢失，action处理结果也全部丢失。

3 chain:action处理完后转发到一个action，请求参数全部丢失，action处理结果不会丢失。

今天碰到的bug显示提示另一个action错误，删掉action后提示
There is no Action mapped for namespace / and action name 
最后才确定redirect-action，chain两种方式路径里不能带.action

J2EE进阶(三)struts2 <s:action>标签的用法

前言

     使用action标签,可以允许在jsp页面中直接调用Action,(类似AJAX页面调用)在调用Action时候,可以指定需要被调用的Action的name和namespace.如果指定了executeResult参数的属性值为true,该标签会把Action的处理结果(视图资源)包含到本页面中. 使用action标签指定属性有:

     id: 可选属性,作为该Action的引用ID    

     name:必选属性,指定调用Action  

     namespace:可选属性,指定该标签调用Action所属namespace    

     executeResult:可选属性,指定是否将Action的处理结果包含到本页面中.默认值为false,不包含.      

     ignoreContextParam:可选参数,指定该页面的请求参数是否需要传入调用的Action中,默认值是false,即传入参数.

     <s:action name="login" executeResult="true" namespace="/"></s:action>

     传递参数

     <s:action name="actinName" executeResult="true" namespace="/">

    <s:param name="currentPage" value="传递的值"></s:param>

    </s:action>

     <s:param ></s:param>是以request方式的值的,而不是以参数传值

     所以request.getParameter("")会获取不到值

     通过request.getAttribute("")方式可以获取

     另外:使用<s:param ></s:param> value指代的是action定义的对象的名称,而不是一个值。和 <s:textfield>中的name是一个意思,所以要要传递字符串的不能把值写value中而应该写成：<s:param >写到这里</s:param>。

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