Struts 2 中的 DispatchAction 功能? [英] DispatchAction Functionality in Struts 2?
问题描述
我有一个 .jsp 页面，其中有四个按钮，分别命名为提交、添加、更新和删除:
I have a .jsp page in which i have four buttons named submit,add,update and delete as:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<s:form action="User" >
<s:submit />
<s:submit action="addUser" value="Add" />
<s:submit action="updateUser" value="Update" />
<s:submit action="deleteUser" value="Delete" />
</s:form>
</body>
</html>
在每次提交时，它都被重定向到我的 struts.xml 文件中提到的操作类:
On each submit it is being redirected to action class as mentioned in my struts.xml file as:
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="struts-default">
<action name="User" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
<action name="addUser" method="add" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
<action name="updateUser" method="update" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
<action name="deleteUser" method="delete" class="vaannila.UserAction">
<result name="success">/success.jsp</result>
</action>
</package>
</struts>
最后到action类的对应方法为:
and finally to the corresponding method of the action class as :
package vaannila;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
private String message;
public String execute()
{
System.out.println("Inside execute method");
message = "Inside execute method";
return SUCCESS;
}
public String add()
{
System.out.println("Inside add method");
message = "Inside add method";
return SUCCESS;
}
public String update()
{
message = "Inside update method";
return SUCCESS;
}
public String delete()
{
message = "Inside delete method";
return SUCCESS;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
当我单击提交按钮时，它会执行很好的方法.但是当我再次单击添加按钮或任何其他按钮时，它会被重定向到执行方法而不是添加方法.我究竟做错了什么?期待您的回答.提前致谢
When i click on Submit button it goes to execute method which is fine. But when i click on Add button or any other button again it get redirected to execute method instead of add method. What am i doing wrong? Looking forward to your answers. Thanks in advance
推荐答案
假设你使用的是Struts2 版本2.3.15.3 或以上版本你需要设置struts.mapper.action.prefix.enabled 常量为 true 以启用对 action: 前缀的支持.
Assuming you are using Struts2 version 2.3.15.3 or above you need to set struts.mapper.action.prefix.enabled constant to true in order to enable support for action: prefix.
把它放在你的 struts.xml 文件中:
Put that in your struts.xml file:
<constant name="struts.mapper.action.prefix.enabled" value="true" />
这篇关于Struts 2 中的 DispatchAction 功能?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
