《struts---利用Token防止表单重复提交》

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.fenghuo.struts.web.actions;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/** 
 * MyEclipse Struts
 * Creation date: 10-07-2012
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 * @struts.action-forward name="success" path="/WEB-INF/jsp/register.jsp"
 */
public class UserRegUI extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * 转到注册页面的action
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {

		//在进入注册页面时为表单生产一个隐藏的标签，储存Token的值
		this.saveToken(request);
		
		return mapping.findForward("success");
	}
}

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.fenghuo.struts.web.actions;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import com.fenghuo.struts.web.forms.UserForm;

/** 
 * MyEclipse Struts
 * Creation date: 10-07-2012
 * 
 * XDoclet definition:
 * @struts.action path="/UserRegister" name="userForm" scope="request" validate="true"
 * @struts.action-forward name="main.jsp" path="/WEB-INF/jsp/main.jsp" redirect="true"
 */
public class UserMain extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * 用户点击提交后会将信息提交到此action
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		
		ActionMessages errors = new ActionMessages();	
		
		//判断如果Token的值不存在，说明重复提交。
		//重复提交，只是用户在当前页面多次点击提交按钮，或后退重新提交
		//如果用户刷新，就会生产新的表单和Token也就不会重复提交了
		if(!isTokenValid(request))
		{
			//添加重复提交信息，并在注册页面做相应的操作，让信息显示出来即可
			errors.add(ActionMessages.GLOBAL_MESSAGE, new ActionMessage("表单重复提交！",false));
		}
		if(!errors.isEmpty())
		{
			saveErrors(request, errors);
			//跳转到错误页面
			return mapping.getInputForward();
		}
		//如果上面未跳转，则清除Token
		resetToken(request);
		
		return mapping.findForward("success");
	}
}