📄 pooleditorservlet.java
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package tutorial;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import javax.servlet.http.*;import javax.servlet.ServletException;import tutorial.persistence.BettingPool;import tutorial.persistence.BettingPoolGame;public class PoolEditorServlet extends HttpServlet { protected void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { updateBettingPool( request ); response.setContentType( "text/html" ); PrintWriter pw = response.getWriter(); pw.println( "<html><head></head><body>" ); if (request.getParameter( "save" ).equals( "Open Pool" )) { String[] errors = getValidationErrors(); if (errors.length != 0) reportErrors( pw, errors ); else { BettingPool.openPool(); } } printBody( pw ); pw.println( "</body></html>" ); } private void reportErrors( PrintWriter pw, String[] errors ) { pw.println( "<table width='90%' style='background-color=yellow; border-color: black; border-width: 2; border-style: solid'>" ); pw.println( "<tr><td colspan='2'><b>Cannot open pool for betting:</b></td></tr>" ); for (int i=0; i < errors.length; i++) { pw.println( "<tr><td width='5'> </td><td>" + errors[i] + "</td></tr>" ); } pw.println( "</table>" ); } String[] getValidationErrors() { ArrayList errorList = new ArrayList(); BettingPoolGame game = BettingPool.getGames()[ BettingPool.getTieBreakerIndex() ]; if (game.getAwayTeam().length() == 0 || game.getHomeTeam().length() == 0) { errorList.add( "Tiebreaker is not a valid game" ); } BettingPoolGame[] games = BettingPool.getGames(); for (int i = 0; i < games.length; i++) { if (games[i].getAwayTeam().length() == 0 && games[i].getHomeTeam().length() != 0) { errorList.add( "Game " + i + " has no away team" ); } else if (games[i].getAwayTeam().length() != 0 && games[i].getHomeTeam().length() == 0) { errorList.add( "Game " + i + " has no home team" ); } } String[] errors = (String[]) errorList.toArray( new String[ errorList.size() ] ); return errors; } void updateBettingPool( HttpServletRequest request ) { BettingPoolGame[] games = BettingPool.getGames(); for (int i = 0; i < games.length; i++) { games[i].setAwayTeam( request.getParameter( "away" + i ) ); games[i].setHomeTeam( request.getParameter( "home" + i ) ); } BettingPool.setTieBreakerIndex( getTieBreakerIndex( request ) ); } private int getTieBreakerIndex( HttpServletRequest request ) { try { return Integer.parseInt( request.getParameter( "tiebreaker" ) ); } catch (NumberFormatException e) { return 0; } } protected void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { response.setContentType( "text/html" ); PrintWriter pw = response.getWriter(); pw.println( "<html><head></head><body>" ); printBody( pw ); pw.println( "</body></html>" ); } private void printBody( PrintWriter pw ) { pw.println( "<form id='pool' method='POST'>" ); pw.println( "<table>" ); pw.println( "<tr><th>Home Team</th><th>Away Team</th><th>Tiebreaker?</th></tr>" ); BettingPoolGame[] games = BettingPool.getGames(); for (int i = 0; i < games.length; i++) { pw.println( "<tr><td><input name='home" + i + "' value='" + games[i].getHomeTeam() + "'" + getReadOnlyFlag() + "></td>" ); pw.println( "<td><input name='away" + i + "' value='" + games[i].getAwayTeam() + "'" + getReadOnlyFlag() + "></td>" ); pw.print( "<td><input type='radio' name='tiebreaker' value='" + i + "'" + getReadOnlyFlag() ); if (i == BettingPool.getTieBreakerIndex()) pw.print( " checked" ); pw.println( " /></td></tr>" ); } pw.println( "</table>" ); if (BettingPool.isEditable()) { pw.println( "<input type='submit' name='save' value='Save' />" ); pw.println( "<input type='submit' name='save' value='Open Pool' />" ); } pw.println( "</form>" ); } private String getReadOnlyFlag() { return BettingPool.isEditable() ? "" : " readonly"; }}⌨️ 快捷键说明
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