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HttpServletRequest & HttpServletResponse
Last Updated : 26 May, 2026
title: Request and Response in Servlet
Servlets JSP25 words2 headingsExamples included
title: Request and Response in Servlet description: HttpServletRequest aur HttpServletResponse
HttpServletRequest — Client se data lena
java exampleWoHoTech
protected void doPost(HttpServletRequest req, HttpServletResponse res) throws Exception {
// Form parameters
String name = req.getParameter("name");
String[] hobbies = req.getParameterValues("hobbies"); // Multiple values
// URL info
String uri = req.getRequestURI(); // "/app/login"
String url = req.getRequestURL().toString();
String method = req.getMethod(); // "GET" or "POST"
String query = req.getQueryString(); // "id=5&type=student"
// Headers
String contentType = req.getContentType();
String userAgent = req.getHeader("User-Agent");
String auth = req.getHeader("Authorization");
// Remote info
String ip = req.getRemoteAddr(); // Client IP
String host = req.getRemoteHost();
// Session
HttpSession session = req.getSession();
HttpSession existing = req.getSession(false); // null if no session
// Attributes (set by previous servlet/filter)
Object attr = req.getAttribute("user");
req.setAttribute("message", "Login successful");
// Forward/Include
req.getRequestDispatcher("/welcome.jsp").forward(req, res);
}HttpServletResponse — Client ko response dena
java exampleWoHoTech
// Content type set karo
res.setContentType("text/html;charset=UTF-8");
res.setContentType("application/json");
// Status code
res.setStatus(HttpServletResponse.SC_OK); // 200
res.sendError(HttpServletResponse.SC_NOT_FOUND, "Page not found"); // 404
// Headers
res.setHeader("Cache-Control", "no-cache");
res.addCookie(new Cookie("user", "Ram"));
// Response body
PrintWriter out = res.getWriter(); // Text
out.println("<h1>Hello</h1>");
OutputStream os = res.getOutputStream(); // Binary (images, files)
// Redirect
res.sendRedirect("/login"); // Client-side redirectExam Focus
Revise definitions, diagrams, examples, and short-answer points for HttpServletRequest & HttpServletResponse.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this Java topic.
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