通鏈接價值豆

Question

我有一個帶有鏈接的JSP文件象下面這樣：

<a href="links.do?method=homeAdmin"> 
<a href="links.do?method=signUp"> 

而且我有一個動作類LinkAction.java：

public class LinkAction extends org.apache.struts.action.Action { 

    public ActionForward signUp(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response) 
      throws Exception { 

     return mapping.findForward("signUp"); 
    } 
    public ActionForward homeAdmin(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response) 
      throws Exception { 

     return mapping.findForward("homeAdmin"); 
    } 
} 

的問題是，這是行不通的。但是當我將其更改爲這樣的情況時，它僅適用於signUp操作。

public class LinkAction extends org.apache.struts.action.Action { 

    @Override 
    public ActionForward execute(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response) 
      throws Exception { 

     return mapping.findForward("signUp"); 
    } 

} 

我也試圖改變它

public class LinkAction extends DispatchAction { ... } 

這裏是我的struts-config.xml

<action input="/index.jsp" 
     name="signUp" 
     path="/links" 
     scope="session" 
     type="Actions.LinkAction"> 
    <forward name="signUp" path="/signUp.jsp"/> 
    <forward name="homeAdmin" path="/homeAdmin.jsp"/> 
</action> 

我想利用這個單一操作文件在我的網頁所有鏈接。我該怎麼做？

Answer 1

您需要添加parameter="method"。這標識了包含方法名稱的請求參數。

如果你有下一步的動作類：

package actions; 

import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionForward; 
import org.apache.struts.action.ActionMapping; 
import org.apache.struts.actions.DispatchAction; 

public class LinkAction extends DispatchAction { 

    public ActionForward signUp(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response) 
      throws Exception { 

     return mapping.findForward("signUp"); 
    } 

    public ActionForward homeAdmin(ActionMapping mapping, ActionForm form, 
      HttpServletRequest request, HttpServletResponse response) 
      throws Exception { 

     return mapping.findForward("homeAdmin"); 
    } 
} 

您需要在struts-config.xml文件如下配置：

<form-beans> 
    <form-bean name="SignUpForm" type="org.apache.struts.action.DynaActionForm"> 
     <form-property name="fname" type="java.lang.String" /> 
     <form-property name="lname" type="java.lang.String" /> 
     <form-property name="usr" type="java.lang.String" /> 
     <form-property name="pwd" type="java.lang.String" /> 
    </form-bean> 
</form-beans> 
<action-mappings> 
    <action path="/links" 
      type="actions.LinkAction" 
      name="SignUpForm" 
      input="/index.jsp" 
      parameter="method" 
      scope="session"> 
     <forward name="signUp" path="/signUp.jsp"/> 
     <forward name="homeAdmin" path="/homeAdmin.jsp"/> 
    </action> 
</action-mappings> 

也org.apache.struts.actions.DispatchAction見。

Answer 2

Struts1 always calls execute(ActionMapping mapping, ActionForm form, 
     HttpServletRequest request, HttpServletResponse response) 

處理請求的方法。您可以嘗試在​​方法中獲取請求parameter('method')，並根據其值將其代理到homeAdmin或signUp。

Answer 3

據我什麼，我得到了你的問題，

1）有沒有什麼辦法，通過一個動作類，可以處理多個任務，如：你的兩個方法可以工作。

public ActionForward signUp(ActionMapping mapping, ActionForm form, 
    HttpServletRequest request, HttpServletResponse response) 
    throws Exception { 

return mapping.findForward("signUp"); 
} 

public ActionForward homeAdmin(ActionMapping mapping, ActionForm form, 
    HttpServletRequest request, HttpServletResponse response) 
    throws Exception { 

return mapping.findForward("homeAdmin"); 
} 

，如果它是正確的，那麼你應該去其他類型的行動即DispatchAction的，因爲它提供了編寫多種方法的能力。

的詳細信息：

public class LanguageSelectAction extends DispatchAction{ 

public ActionForward chinese(ActionMapping mapping,ActionForm form, 
    HttpServletRequest request,HttpServletResponse response) 
throws Exception { 

    request.getSession().setAttribute(
      Globals.LOCALE_KEY, Locale.SIMPLIFIED_CHINESE); 

    return mapping.findForward("provide"); 
} 

public ActionForward english(ActionMapping mapping,ActionForm form, 
    HttpServletRequest request,HttpServletResponse response) 
throws Exception { 

    request.getSession().setAttribute(
      Globals.LOCALE_KEY, Locale.ENGLISH); 

    return mapping.findForward("success"); 
} 

public ActionForward german(ActionMapping mapping,ActionForm form, 
    HttpServletRequest request,HttpServletResponse response) 
throws Exception { 

    request.getSession().setAttribute(
      Globals.LOCALE_KEY, Locale.GERMAN); 

    return mapping.findForward("success"); 
} 

public ActionForward france(ActionMapping mapping,ActionForm form, 
    HttpServletRequest request,HttpServletResponse response) 
throws Exception { 

    request.getSession().setAttribute(
      Globals.LOCALE_KEY, Locale.FRANCE); 

    return mapping.findForward("success"); 
} 

}

你可以得到詳細的here

Answer 4

由於PIYUSH上面解釋的做延伸與DispatchAction的Action類點擊http://struts.apache.org/release/1.3.x/struts-extras/apidocs/org/apache/struts/actions/DispatchAction.html

和配置在你的配置文件應該是這樣的

<action-mappings> 
    <action input="/yourpage.jsp" parameter="method" name="yourform" 
    path="/yourAction" scope="session/request" type="yourpackage.youraction"> 
    <forward name="signup" path="/yourpage.jsp" /> 
</action>