没有为名称空间/和操作名称打招呼的操作 [英] There is no Action mapped for namespace / and action name hello
问题描述
package com.tutorialspoint.struts2;
public class HelloWorldAction{
private String name;
public String execute() throws Exception {
return "success";
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
index.jsp
index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Hello World</title>
</head>
<body>
<h1>Hello World From Struts2</h1>
<form action="hello">
<label for="name">Please enter your name</label><br/>
<input type="text" name="name"/>
<input type="submit" value="Say Hello"/>
</form>
</body>
</html>
struts.xml
struts.xml
<?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.devMode" value="true" />
<package name="helloworld" extends="struts-default">
<action name="hello"
class="com.tutorialspoint.struts2.HelloWorldAction"
method="execute">
<result name="success">/HelloWorld.jsp</result>
</action>
</package>
</struts>
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"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>Struts 2</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
HelloWorld.jsp
HelloWorld.jsp
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Hello World</title>
</head>
<body>
Hello World, <s:property value="name"/>
</body>
</html>
我为Struts中的hello World Example编写了此代码，但出现错误:
This code i have write for hello World Example In Struts But i am getting Error :
HTTP状态404-没有为名称空间/和操作名称索引映射的操作.
HTTP Status 404 - There is no Action mapped for namespace / and action name index.
一个新的Struts并尝试了解Struts Mvc Framw的工作，但我不知道这是在做误区，想念在哪里，请帮助我如何解决问题
am new in struts and try to Understand struts Mvc Framw work But i dont know here am doing Mistake where am Missing this please help me how i will Fix it
推荐答案
-
使用新的过滤器
Use the new filter
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
代替旧的
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
除非您使用的是Struts2的旧版本(例如2.0).
unless you are using a very old version of Struts2 (2.0 for example).
您的web.xml部署描述符混乱了:您说的是3.0，然后链接了2.5 xmlns:web.
Your web.xml deployment descriptor is messed up: you are saying it is 3.0, then linking 2.5 xmlns:web.
如果您有Servlet 3.0容器(Java EE 6)，请使用:
If you have a Servlet 3.0 Container (Java EE 6) use:
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
如果您有Servlet 2.5容器(Java EE 5)，请使用:
If you have a Servlet 2.5 Container (Java EE 5) use:
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
在包声明中指定名称空间，因此，当您添加新包时，不会有问题:
Specify namespace in your package declaration, so when you will add new packages you won't have problems:
<package name="helloworld" extends="struts-default" namespace="/" >
如果是execute()，则无需在Action config中指定方法，如果是"success"，则无需指定结果:
No need to specify the method in Action config if it is execute(), and no need to specify the result if it is "success":
<action name="hello" class="com.tutorialspoint.struts2.HelloWorldAction" >
<result>/HelloWorld.jsp</result>
</action>
如果可能，最好使用HTML5 DOCTYPE和UTF-8 CharSet.
Better using HTML5 DOCTYPE and UTF-8 CharSet if possible.
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