📄 adminprotocolhandler.java
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// Copyright 2002 Nokia Corporation. // // THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER, // EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS // FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE // OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE // ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO // OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR // SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE // RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT // OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED // BY THIRD PARTIES // // Furthermore, information provided in this source code is preliminary, // and may be changed substantially prior to final release. Nokia Corporation // retains the right to make changes to this source code at // any time, without notice. This source code is provided for informational // purposes only. // // Nokia and Nokia Connecting People are registered trademarks of Nokia// Corporation.// Java and all Java-based marks are trademarks or registered trademarks of// Sun Microsystems, Inc.// Other product and company names mentioned herein may be trademarks or// trade names of their respective owners.// // A non-exclusive, non-transferable, worldwide, limited license is hereby // granted to the Licensee to download, print, reproduce and modify the // source code. The licensee has the right to market, sell, distribute and // make available the source code in original or modified form only when // incorporated into the programs developed by the Licensee. No other // license, express or implied, by estoppel or otherwise, to any other // intellectual property rights is granted herein.package example.fruitmachine;import java.io.*;import java.util.*;import javax.servlet.*;import javax.servlet.http.*;class AdminProtocolHandler { private final UserDatabase userDatabase; AdminProtocolHandler(UserDatabase userDatabase) { this.userDatabase = userDatabase; } void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String pathInfo = request.getPathInfo(); String pathRoot = request.getContextPath() + request.getServletPath(); if (pathInfo == null) { response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Missing path info"); } else if (pathInfo.equals("/admin-create")) { writeCreateAccountPage(out, pathRoot); } else if (pathInfo.equals("/admin-delete")) { writeDeleteAccountPage(out, pathRoot); } else if (pathInfo.equals("/admin")) { writeListAccountPage(out, pathRoot); } else { response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Unexpected path info"); } out.close(); } private void writeCreateAccountPage(PrintWriter out, String pathRoot) throws IOException { out.println("<html>"); out.println("<head>"); out.println("<title>Fruit Machine: Create Account</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Fruit Machine: Create Account</h1>"); out.println("<form method=\"POST\" action=\"" + pathRoot + "/admin-create\">"); out.println("<table>"); out.println("<tr><td>Name:</td>"); out.println("<td><input type=text size=16 maxlength=16 " + "name=name></td></tr>"); out.println("<tr><td>Password:</td>"); out.println("<td><input type=password size=8 maxlength=8 " + "name=password></td></tr>"); out.println("<tr><td colspan=2 align=center>"); out.println("<input type=submit value=\"Create\">"); out.println("</td></tr>"); out.println("</table>"); out.println("</form>"); out.println("<p>Note: accounts are not stored persistently in" + " this prototype.</p>"); out.println("</body>"); out.println("</html>"); } private void writeDeleteAccountPage(PrintWriter out, String pathRoot) throws IOException { out.println("<html>"); out.println("<head>"); out.println("<title>Fruit Machine: Delete Account</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Fruit Machine: Delete Account</h1>"); out.println("<form method=\"POST\" action=\"" + pathRoot + "/admin-delete\">"); out.println("Delete an existing account:"); out.println("<table>"); out.println("<tr><td>Name:</td>"); out.println("<td><input type=text size=16 maxlength=16 " + "name=name></td></tr>"); out.println("<tr><td>Password:</td>"); out.println("<td><input type=password size=8 maxlength=8 " + "name=password></td></tr>"); out.println("<tr><td colspan=2 align=center>"); out.println("<input type=submit value=\"Delete\">"); out.println("</td></tr>"); out.println("</table>"); out.println("</form>"); out.println("<p>Note: accounts are not stored persistently in" + " this prototype.</p>"); out.println("</body>"); out.println("</html>"); } private void writeListAccountPage(PrintWriter out, String pathRoot) throws IOException { out.println("<html>"); out.println("<head>"); out.println("<title>Fruit Machine: Accounts</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Fruit Machine: Accounts</h1>"); out.println("Existing accounts:"); out.println("<table>"); out.println("<tr><th>Name</th><th>Credit</th></tr>"); Iterator iter = userDatabase.getAllUsers().iterator(); while (iter.hasNext()) { User user = (User)(iter.next()); String name = user.getName(); int credit = user.getCredit(); out.println("<tr><td>" + name + "</td>" + "<td>" + credit + "</td></tr>"); } out.println("</table>"); out.println("<form method=\"GET\" action=\"" + pathRoot + "/admin-create\">"); out.println("<input type=submit value=\"Create\">"); out.println("</form>"); out.println("<form method=\"GET\" action=\"" + pathRoot + "/admin-delete\">"); out.println("<input type=submit value=\"Delete\">"); out.println("</form>"); out.println("<p>Note: accounts are not stored persistently in" + " this prototype.</p>"); out.println("</body>"); out.println("</html>"); } void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { String pathInfo = request.getPathInfo(); if (pathInfo == null) { response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Missing path info"); } else if (pathInfo.equals("/admin-create")) { handleCreateAccountRequest(request, response); } else if (pathInfo.equals("/admin-delete")) { handleDeleteAccountRequest(request, response); } else { response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Unexpected path info"); } } private void handleCreateAccountRequest(HttpServletRequest request, HttpServletResponse response) throws IOException { String name = request.getParameter("name"); String pathRoot = request.getContextPath() + request.getServletPath(); if ((name == null) || (name.length() == 0)) { writeErrorPage(response, "Specify a name", pathRoot); } else if (userDatabase.getUser(name) != null) { writeErrorPage(response, "User \"" + name + "\" already exists", pathRoot); } else { String password = request.getParameter("password"); if (password == null) { password = ""; } User user = userDatabase.createUser(name, password); writeAccountCreatedPage(response, name, pathRoot); } } private void handleDeleteAccountRequest(HttpServletRequest request, HttpServletResponse response) throws IOException { String name = request.getParameter("name"); String pathRoot = request.getContextPath() + request.getServletPath(); if ((name == null) || (name.length() == 0)) { writeErrorPage(response, "Specify a name", pathRoot); } else { String password = request.getParameter("password"); if (password == null) { password = ""; } User user = userDatabase.getUser(name); if ((user == null) || !user.isCorrectPassword(password)) { writeErrorPage(response, "Invalid name or password", pathRoot); } else { userDatabase.deleteUser(user); writeAccountDeletedPage(response, name, pathRoot); } } } private void writeErrorPage(HttpServletResponse response, String message, String pathRoot) throws IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Fruit Machine: Error</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Error</h1>"); out.println("<p>" + message + "</p>"); out.println("<a href=\"" + pathRoot + "/admin\">Back to account list</a>"); out.println("</body>"); out.println("</html>"); out.close(); } private void writeAccountCreatedPage(HttpServletResponse response, String name, String pathRoot) throws IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Fruit Machine: Account Created</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Account Created</h1>"); out.println("<p>Account " + name + " is now ready for use.</p>"); out.println("<a href=\"" + pathRoot + "/admin\">Back to account list</a>"); out.println("</body>"); out.println("</html>"); out.close(); } private void writeAccountDeletedPage(HttpServletResponse response, String name, String pathRoot) throws IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Fruit Machine: Account Deleted</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Account Deleted</h1>"); out.println("<p>Account " + name + " is now deleted.</p>"); out.println("<a href=\"" + pathRoot + "/admin\">Back to account list</a>"); out.println("</body>"); out.println("</html>"); out.close(); }}⌨️ 快捷键说明
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