Struts的扩展:添加可以传参数的ActionForward(一)

王朝java/jsp·作者佚名  2006-01-10
窄屏简体版  字體: |||超大  

一。添加一个新的ActionForward 扩展,以支持在Redirect时传递参数

package org.apache.struts.action;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

/**

* A subclass of {@link ActionForward} which is designed for use in redirecting

* requests, with support for adding parameters at runtime.

*

* @author luoyonghong

*

*/

public class ParameterForward extends ActionForward {

private Map parameters = new HashMap();

public void setParameter(String name, Object value) {

parameters.put(name, value);

}

public void setParameter(String name, long value) {

setParameter(name, Long.toString(value));

}

public String getPath() {

if (configured) {

throw new IllegalStateException("Configuration is frozen");

}

String oldPath = getPath();

StringBuffer sb = new StringBuffer(oldPath);

Iterator keys = parameters.keySet().iterator();

for (int i = 0; keys.hasNext(); i++) {

String name = (String) keys.next();

Object value = parameters.get(name);

if (name != null && value != null) {

if (i == 0 && (oldPath.indexOf("?") < 0)) {

sb.append("?");

} else {

sb.append("&");

}

sb.append(name).append("=").append(value);

}

}

setPath(sb.toString());

return super.getPath();

}

/**

* @param copyMe

*/

public ParameterForward(ActionForward copyMe) {

super(copyMe);

}

}

二。修改原ActionMapping 类,添加一个取得ParameterForward 的方法(如红色所示):

package org.apache.struts.action;

import java.util.ArrayList;

import org.apache.struts.action.ActionForward;

import org.apache.struts.config.ActionConfig;

import org.apache.struts.config.ForwardConfig;

public class ActionMapping extends ActionConfig {

//省略原有的代码

......

/**

* add by redbeans (2002-12-24)

* @param name

* @return

*/

public ParameterForward copyForward(String name) {

return new ParameterForward(findForward(name));

}

}

三。在Action中使用此Forward:

....

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

//你自已的操作

....

ParameterForward forward = mapping .copyForward("success");

forward.setParameter("section_id", sectionId);

return forward;

}

...

 
 
 
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