Problem with STRUTS2 encountered there is no action mapped for Namespaces/and action name

In the initial configuration of struts, you encounter a similar problem with there is no action mapped for Namespace/and action name, many of which are caused by our carelessness, as summarized in the following workaround:

1, struts.xml file configuration error, which is one of the big reasons

DTD problem is no longer mentioned here, many online related posts, the problem here is mainly applicable to version 2.0 of the problem, pay attention to distinguish between 2.0 and 2.1, the recommendations are used 2.0
Next is the problem of encoding format, if you encounter Chinese garbled, remember to add

<span style= "FONT-SIZE:18PX;" ><constant name= "struts.i18n.encoding" value= "GBK" ></constant></span>

Most issues are in the package,

Extends's role is mainly used to inherit struts-default or other package, according to their own circumstances change, it is recommended not to miss out;

namespace do not spell mistakes, because in the project will be divided into separate each module, it is recommended in peacetime practice in the best in the namespace/module name , good distinction, if the usual practice can write/, in the interview directly write

<%=request.getcontextpath ()%>/index.action

In the package there is a relatively easy to overlook is the action in <result>/r1.jsp</result>will be easier to miss "/", in the Access action prompt the requested resource is not available. Mostly because of a leak/a little more careful

<span style= "FONT-SIZE:18PX;" ><?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>     <constant name=" struts.i18n.encoding "value=" GBK "></constant>    <package name=" Actions "namespace="/actions "extends=" Struts-default ">        < Action name= "index" >            <result>/r1.jsp</result>        </action>    </package></ Struts></span>

2. Problems that are easy to appear in index.jsp

<span style= "FONT-SIZE:18PX;" ><%@ page language= "java" contenttype= "text/html; charset=gb18030 "    pageencoding=" GB18030 "%><%    String Context=request.getcontextpath ();    SYSTEM.OUT.PRINTLN (context);%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >

The problem here is mainly in the JSP storage location, attention to distinguish between eclipse and myeclipse, I am using ECLIPSEEE,JSP storage location webcontent, and Web-inf at the same level , This is also one of the important reasons for not visiting
It is advisable to add. Action when visiting.
3. Web. xml
<?xml version= "1.0" encoding= "UTF-8"? ><web-app xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://java.sun.com/xml/ns/javaee" xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee/http Java.sun.com/xml/ns/javaee/web-app_2_5.xsd "id=" webapp_id "version=" 2.5 ">  <display-name>struts</ display-name>   <filter>    <filter-name>struts2</filter-name>    <filter-class >org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>   </filter >  <filter-mapping>    <filter-name>struts2</filter-name>    <url-pattern>/* </url-pattern>  </filter-mapping>     <welcome-file-list>    <welcome-file> index.jsp</welcome-file>  </welcome-file-list>  </web-app>

It is best to copy the above filter, do not change the content, the problem may appear in <welcome-file-list>, because there is a index.html and index.htm in the originally generated Web. xml file, choose according to your own situation
The above is the experience, hope to help everyone ~ ~



Problem with STRUTS2 encountered there is no action mapped for Namespaces/and action name