Struts 2中的DispatchAction功能? [英] DispatchAction Functionality in Struts 2?
问题描述
我有一个.jsp页面，其中有四个名为Submit，Add，Update和Delete的按钮，分别为:
<%@ 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，它都被重定向到操作类，如我的struts.xml文件中所述:
<!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>
最后是操作类的相应方法:
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Submit(提交)按钮时，它将执行执行方法，这很好.但是当我再次单击添加"按钮或任何其他按钮时，它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.预先感谢
假定您使用的是Struts2版本2.3.15.3或更高版本，则需要将struts.mapper.action.prefix.enabled常量设置为true，以支持对action:前缀. /p>
将其放在您的struts.xml文件中:
<constant name="struts.mapper.action.prefix.enabled" value="true" />
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>
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>
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;
}
}
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
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.
Put that in your struts.xml file:
<constant name="struts.mapper.action.prefix.enabled" value="true" />
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