httprequestresponseservlet.java
来自「JAVA Servlet2.3外文书籍源码」· Java 代码 · 共 105 行
JAVA
105 行
package httpExamples;import javax.servlet.*;import javax.servlet.http.*;import java.io.IOException;import java.io.PrintWriter;import java.util.Enumeration;import java.util.Date;/** * Title: Professional Java Servlet Programming - Chapter 2 * Description: * Copyright: Copyright (c) 2001 * @author Andrew Harbourne-Thomas * @version 1.0 */public class HttpRequestResponseServlet extends HttpServlet{ private static int cookiesCreated = 0; /** * Output a web page with HTTP request information and response data. * * @param request The object containing the client request * @param response The object used to send the response back */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { StringBuffer httpRequestTable = getHttpRequestTable(request); StringBuffer httpResponseTable = getHttpResponseTable(response); response.setContentType("text/html"); PrintWriter out = response.getWriter(); //HTML page out.println("<html><head><title>RequestResponseServlet</title></head><body>"); out.println("<h1>Request Information</h1>" + httpRequestTable + "<hr>"); out.println("<h1>Response Information</h1>" + httpResponseTable); out.println("</body></html>"); out.close(); } /** * Prepare a HTML table of information about the request made. * * @param request The object containing the client request * @return String containing the table */ private StringBuffer getHttpRequestTable(HttpServletRequest request) { HTMLTable table = new HTMLTable(); table.appendRow("HTTP Request Method", request.getMethod()); table.appendRow("Query String", request.getQueryString()); table.appendRow("Context Path", request.getContextPath()); table.appendRow("Servlet Path", request.getServletPath()); /* //additional info if required table.appendRow("Path Info", request.getPathInfo()); table.appendRow("Path Translated", request.getPathTranslated()); table.appendRow("Request URI", request.getRequestURI()); table.appendRow("Request URL", request.getRequestURL().toString());*/ Cookie[] ourCookies = request.getCookies(); if (ourCookies == null || ourCookies.length == 0) { table.appendRow("Cookies", "NONE"); } else { for (int i = 0; i < ourCookies.length; i++) { String cookieName = ourCookies[i].getName(); String cookieValue = ourCookies[i].getValue(); table.appendRow("Cookie: <code>" + cookieName + "</code>", cookieValue); } } Enumeration e = request.getHeaderNames(); while (e.hasMoreElements()) { String headerName = (String)e.nextElement(); String headerValue = request.getHeader(headerName); table.appendRow("Header: <code>" + headerName + "</code>", headerValue); } return table.toStringBuffer(); } /** * Prepare a HTML table of information about the response made. * * @param response Gives access to the response object * @return String containing the table */ private StringBuffer getHttpResponseTable(HttpServletResponse response) { HTMLTable table = new HTMLTable(); int cookieCount = cookiesCreated++; String name = Integer.toString(cookieCount); String value = new Date(System.currentTimeMillis()).toString(); Cookie cookie = new Cookie(name, value); response.addCookie(cookie); table.appendRow("Cookie Added:<code>" + name + "</code>", value); return table.toStringBuffer(); }}⌨️ 快捷键说明
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