《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TokenresetToken(request);return mapping.findForward("success");}}