📄 evalservlet.java
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package jabadot;import java.io.*;import javax.servlet.*;import javax.servlet.http.*;public class EvalServlet extends HttpServlet { public static String EVALS_FILE = "/home/ian/evals.txt"; PrintWriter log; /** Initialize the servlet */ public void init() { try { boolean append = true; log = new PrintWriter(new FileWriter(EVALS_FILE, append)); log("Log opened, file = " + log); } catch (IOException e) { log("Failed to open writer"); } } /** Service one request. */ public void doGet(HttpServletRequest request, HttpServletResponse resp) throws IOException, ServletException { resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<HTML><HEAD><TITLE>Evaluation</TITLE>"); out.println("<BODY BGCOLOR=\"#0000CC\">"); if (log == null) { out.println("<H3>Error</H3>"); out.println("Sorry, unable to log (I/O error)"); out.println("<P>Please notify your instructor at once!"); return; } User user = (User)request.getSession().getAttribute("jabadot.login"); if (user==null) { out.println("<P>You must be logged in to use this servlet."); return; } boolean errors = false; String name = user.getName(); int courseGrade = -1; String course = request.getParameter("course"); if (course == null || course.length() == 0) { out.println("<P>Please provide a course grade"); errors = true; } else courseGrade = Integer.parseInt(course); int instrGrade = 0; String instr= request.getParameter("instr"); if (instr == null || instr.length() == 0) { out.println("<P>Please provide an instructor grade"); errors = true; } else instrGrade = Integer.parseInt(instr); String pace = request.getParameter("pace"); String best = request.getParameter("best"); String improve = request.getParameter("improve"); if (errors) { out.println("<P>Please use the \"Back\" button and try again."); return; } out.print("<H1>Thank you</H1>"); String host = request.getRemoteHost(); out.print("<P>Thanks for the comments"); if (name.length() != 0) { out.print(", "); out.print(name); } out.print('@'); out.println(host); out.print("<P>You rated the course a "); out.println(courseGrade); out.print("<P>You rated the instructor's performance a "); out.println(instrGrade); out.print("<P>You rated the pace as "); out.println(pace); if (best.length() != 0) { out.print("<P>You rated the best part as \""); out.print(best); out.println('\"'); } if (improve.length() != 0) { out.print("<P>You suggested these improvements: \"" ); out.println(improve); out.println('\"'); } if (request.getParameter("reviewed") != null) { loggit(name, host, courseGrade, instrGrade, pace, best, improve); out.println("<H3>Done!</H3><P>Your comments have been recorded."); } else { out.print("<BR>"); // Kludge - seem to have to use POST here to // let the browser "see" the query string... out.print("<FORM METHOD=POST ACTION="); out.print(HttpUtils.getRequestURL(request). append("?reviewed=true&"). append(request.getQueryString())); out.println(">"); out.print("<INPUT TYPE=submit VALUE=\"Press here to confirm\">"); out.println("</FORM>"); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } protected synchronized void loggit(String name, String host, int course, int instructor, String pace, String best, String improve) { log.print("N "); log.print(course); log.print('\t'); log.print(instructor); log.print('\t'); log.print(pace); log.print(" \""); log.print(name); log.print("\"@"); log.print(host); log.println(); if (best != null && best.length() != 0) { log.print("BEST "); log.print(best.replace('\r', ' ').replace('\n', ' ')); log.println(); } if (improve != null && improve.length() != 0) { log.print("IMPROVE "); log.print(improve.replace('\r', ' ').replace('\n', ' ')); log.println(); } log.flush(); }}⌨️ 快捷键说明
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