重定向和转向的写法，重定向以post方式提交


重转向保留跳转过来的Referer,路径不会变
1  request.getRequestDispatcher("/eventweb/index.sp?loginId=" + loginId).forward(request, response);

重定向的 第一种方式         

       PrintWriter out = response.getWriter();                
                out.println("<html>");       
                out.println("<script>");
                out.println("window.open ('" + request.getContextPath() + "/eventweb/declare.sp?loginId=" + loginId + "','_top')");
                out.println("</script>");
                out.println("</html>")

重定向的 第二种方式，跳转时以post方式提交（如果get会展示携带的参数，不安全）

1   RedirectWithPost redirectWithPost = new RedirectWithPost(response);
2                String redirectUrl = request.getContextPath() + "/eventweb/declare.sp";
3               redirectWithPost.setParameter("loginId", loginId);
4                 redirectWithPost.sendByPost(redirectUrl);

/**
 * 用POST方式 重定向
 *
 * @author royFly
 */
public class RedirectWithPost {
    Map<String, String> parameter = new HashMap<String, String>();
    HttpServletResponse response;

    public RedirectWithPost(HttpServletResponse response) {
        this.response = response;
    }

    public void setParameter(String key, String value) {
        this.parameter.put(key, value);
    }

    public void sendByPost(String url) throws IOException {
        this.response.setContentType("text/html");
        PrintWriter out = this.response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
        out.println("<HTML>");
        out.println(" <HEAD>");
        out.println(" <meta http-equiv=Content-Type content="text/html; charset=utf-8">");
        out.println(" <TITLE>loading</TITLE>");
        out.println(" <meta http-equiv="Content-Type" content="text/html charset=GBK">
");
        out.println(" </HEAD>");
        out.println(" <BODY>");
        out.println("<form name="submitForm" action="" + url + "" method="post">");
        Iterator<String> it = this.parameter.keySet().iterator();
        while (it.hasNext()) {
            String key = it.next();
            out.println("<input type="hidden" name="" + key + "" value="" + this.parameter.get(key) + ""/>");
        }
        out.println("</from>");
        out.println("<script>window.document.submitForm.submit();</script> ");
        out.println(" </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }
}

重定向的第三种方式

sendRedirect(request, response, url, true);