Struts 2 - Cannot display value from Action in JSP Page

Question

I'm newbie and work with Struts 2. I waste some days but cannot fix it.

eclipse 4.4.2 luna
struts 2.3.20
tomcat 8

action class:

public class UserAction extends ActionSupport implements Action{

    private static final long serialVersionUID = 3665293407194339009L;
    private String message;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        message="this is inside execute";
        return SUCCESS;
    }

}

struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />

<constant name="struts.devMode" value="true" />
<constant name="struts.action.extension" value="html" />

    <package name="default" namespace="/" extends="struts-default">
        <action name="index" class="com.action.controller.UserAction" method="execute">
            <result name="SUCCESS">/index.jsp</result>
        </action>
    </package>
</struts>

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>
        <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
        <title>Insert title here</title>
    </head>
    <body>
        <h4>AAAAA</h4>
        <s:property value="message"/>
    </body>
</html>

这是项目运行时的屏幕

No error
Log is ok

It only displays AAAA in <h4> but does not show the message. I try both XML and annotation but it doesn't show the message. I don't know what the problem is with my project.

Answer 1

You are returning the constant SUCCESS , that is mapped to the String "success" , and then mapping the String "SUCCESS" in the struts.xml.
Change "SUCCESS" to "success" in struts.xml :
```
 <result name="success">/index.jsp</result> 
```
You are probably opening the page without passing through the action before.

Struts 2 - Cannot display value from Action in JSP Page

Question

1 answers

solution1
2 2015-12-10 16:25:34

Struts 2 - Cannot display value from Action in JSP Page

Question

1 answers

solution1 2 2015-12-10 16:25:34

solution1
2 2015-12-10 16:25:34