登陆后跳转到之前页面
一、非集群
? 在非集群的情况下，我们一般用session来管理用户的，一般的框架都会有拦截器或安全处理，在此我只写个大致方法和思路，具体的类就不写了，
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public byte[] doLogin(HttpServletRequest req) {StringBuilder builder = new StringBuilder();Enumeration result = req.getAttributeNames();//获取该请求的参数为还原做准备while (result.hasMoreElements()) {String attri = (String) result.nextElement();builder.append(attri).append("=").append(req.getAttribute(attri).toString()).append(",");//此处用","隔开每个参数，用&时在页面会出错}String returnUrl = req.getRequestURL() + "?" + builder.toString();req.setAttribute("returnUrl", returnUrl);}??
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login页面
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<form id="logForm" method="post" action="login"> //此处记录将要登陆后的将要返回的页面url?<input type="hidden" name="returnUrl" value="${ param.returnUrl }"/> <div>用户名：<input type="text" maxlength="25" name="userName" id="userName" /></div> <div>密 码：<input type="password" maxlength="50" name="password" id="password" /></div> <div id="buttonBar"> <input value="确定" type="submit" /> <div name="code">//之前的登录判断没写，执行到这步时已经登录上了public void Login(HttpServletRequest req,HttpServletResponse resp){String returnUrl = (String) req.getAttribute("returnUrl");if(null != returnUrl || !returnUrl.equals("")){returnUrl = returnUrl.replace(",", "&");resp.sendRedirect(returnUrl);}else{resp.sendRedirect(req.getContextPath() + "/home");}}??