Struts2 -- No result defined for action action.Register and result success

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Struts2 – No result defined for action action.Register and result success

BUG
　　在跟着官网的例子学习Struts 2框架的时候遇到了个问题：No result defined for action action.Register and result success.最后发现是struts.xml里 package的namespace的问题。解决方法在struts.xml的注释里说明了。

Person.java:

package action;import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionSupport;
import model.Person;/*** Create by sino_crazy_snail on 2018-04-02* Email: sino_crazy_snail@qq.com*/
public class Register extends ActionSupport {private Person person;public Person getPerson() {return person;}public void setPerson(Person person) {this.person = person;}/*** A default implementation that does nothing an returns "success".* <p>* <p>* Subclasses should override this method to provide their business logic.* </p>* <p>* <p>* See also {@link Action#execute()}.* </p>** @return returns {@link #SUCCESS}* @throws Exception can be thrown by subclasses.*/@Overridepublic String execute() throws Exception {return SUCCESS;}
}

struts.xml:

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN""http://struts.apache.org/dtds/struts-2.5.dtd"><struts><constant name="struts.devMode" value="true" /><constant name="struts.convention.classes.reload" value="true"/><!--换成"<package name="hellodemo" namespace="/" extends="struts-default">"就可以正常运行了--><package name="hellodemo"  extends="struts-default"><action name="index"><result>/index.jsp</result></action><action name="register" class="action.Register" method="execute"><result name="success">/thankyou.jsp</result></action></package>
</struts>

index.jsp:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html lang="en">
<head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Hello_World Application - Welcome</title>
</head>
<body><h1>Welcome To Struts 2!</h1><p><a href="register.jsp">Please register</a> for our prize drawing. </p>
</body>
</html>

<%--User : sino_crazy_snailEmail: sino_crazy_snail@qq.comDate : 2018-04-02Time : 11:56To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head><title>Register</title>
</head>
<body><h3>Register for a prize by completing this form.</h3><s:form action="register"><s:textfield name="person.firstName" label="First Name: "/><s:textfield name="person.lastName" label="Last Name: "/><s:textfield name="person.email" label="Email: "/><s:textfield name="person.age" label="Age: "/><s:submit value="Submit"/></s:form>
</body>
</html>

thankyou.jsp

<%--User : sino_crazy_snailEmail: sino_crazy_snail@qq.comDate : 2018-04-02Time : 12:07To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head><title>Thank You</title>
</head>
<body><h3>Thank you for registering for a prize.</h3><p>Your registration information: <s:property value="person"/> </p><p><a href="<s:url action='index'/>">Return to home page</a> </p>
</body>
</html>

build.gradle:

group 'sino_crazy_snail'
version '1.0-SNAPSHOT'apply plugin: 'java'
apply plugin: 'war'sourceCompatibility = 1.8
buildscript {ext.struts2_version="2.5.16"ext.log4j2_version="2.11.0"
}
repositories {mavenCentral()
}dependencies {compile "org.apache.struts:struts2-core:${struts2_version}"compile "org.apache.struts:struts2-convention-plugin:${struts2_version}"compile "org.apache.logging.log4j:log4j-core:${log4j2_version}"compile "org.apache.logging.log4j:log4j-api:${log4j2_version}"testCompile group: 'junit', name: 'junit', version: '4.12'
}