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);
String redirectUrl = request.getContextPath() + "/eventweb/declare.sp";
redirectWithPost.setParameter("loginId", loginId);
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\">\n");
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);