Java/Servlets/Redirect
Содержание
Client auto refresh
<source lang="java">
import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class AutoServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { //client browser will request the page every 60 seconds HttpSession session = request.getSession(); Long times = (Long) session.getAttribute("times"); if (times == null) session.setAttribute("times", new Long(0)); long temp = 1; if (times != null) temp = (times.longValue()) + 1; if (temp < 5) response.addHeader("Refresh", "15"); response.setContentType("text/html"); java.io.PrintWriter out = response.getWriter(); out.println("<html><head><title>Client Refresh</title></head><body>"); //More HTML or dynamic content out.println("You"ve viewed this page " + temp + " times."); session.setAttribute("times", new Long(temp)); out.println("</body></html>"); } //end doGet
}
</source>
Forward Call from a Servlet
<source lang="java">
import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Main extends HttpServlet {
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { RequestDispatcher dispatcher = request.getRequestDispatcher("/p.jsp"); dispatcher.forward(request, response); }
}
</source>
Redirect Servlet Call to Another URL
<source lang="java">
import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Main extends HttpServlet {
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Redirect call to another url response.sendRedirect("http://www.jexp.ru"); }
}
</source>
Redirect to New Location
<source lang="java">
/*
* <servlet> <servlet-name>RedirectNewLocation</servlet-name> <servlet-class>RedirectNewLocation</servlet-class> </servlet> <servlet-mapping> <servlet-name>RedirectNewLocation</servlet-name> <url-pattern>/RedirectNewLocation</url-pattern> </servlet-mapping> * */
import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class RedirectNewLocation extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY); response.setHeader("Location", "http://www.jexp.ru"); response.setContentType("text/html"); return; }
}
</source>
Servlet redirect
<source lang="java">
import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class RedirectWithLinkServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); response.setContentType("text/html"); out.println("<html><body>");out.println("
Java Source and Support
");
out.println(""); out.println("</body></html>"); return; }
}
</source>