我正在关注 “Struts 2 in Action” 这本书，在该书的第一章下，有一个需要开发的示例基本应用程序。我尝试遵循它，但操作类未正确调用。但是，我可以查看成功结果JSP页面。当我使用调试模式并尝试调试操作类的
execute()我的
Actionpackage manning.chapterTwo;
import org.apache.struts2.config.Result;
import com.opensymphony.xwork2.ActionSupport;
@Result(name="SUCCESS", value="/chapterTwo/HelloWorld.jsp" )
public class AnnotatedHelloWorldAction extends ActionSupport{
private static final long serialVersionUID = 1L;
private static final String GREETING = "Hello ";
public String execute() {
setCustomGreeting( GREETING + getName() );
return "SUCCESS";
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
private String customGreeting;
public String getCustomGreeting()
{
return customGreeting;
}
public void setCustomGreeting( String customGreeting ){
this.customGreeting = customGreeting;
}
}
获取输入的 JSP 页面如下所示 (
NameCollector.jsp<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>Name Collector</title>
</head>
<body>
<hr>
<h4>Enter your name so that we can customize a greeting just for you!</h4>
<s:form action="annotatedHelloWorld">
<s:textfield name="name" label="Your name"/>
<s:submit/>
</s:form>
<hr>
</body>
</html>
输出JSP：
<%@ page contentType="text/html; charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>HelloWorld</title>
</head>
<body>
<hr>
<h3>Custom Greeting Page</h3>
<h4><s:property value="customGreeting"/></h4>
<hr>
</body>
</html>
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_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>Struts2HelloWorldXML</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
<init-param>
<param-name>actionPackages</param-name>
<param-value>manning</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
如何解决？
您应该向操作类或方法添加操作注释
@ParentPackage("chapterTwo");
@Action(value="HelloWorld", results=@Result(name="SUCCESS", value="/chapterTwo/HelloWorld.jsp" ))
public class AnnotatedHelloWorldAction extends ActionSupport {
假设作者使用约定来映射您的操作或在勘误表中添加操作注释。还添加了action所属的父包注解。并且不要忘记将 struts2-convention-plugin 添加到库集中，因为示例中遗漏了它。