AJAX autocomplete 例子

/* Copyright 2005 Sun Microsystems, Inc. All rights reserved. You may not modify, use, reproduce, or distribute this software except in compliance with the terms of the License at: http://developer.sun.com/berkeley_license.html $Id: AutocompleteServlet.java,v 1.2 2005/04/01 19:20:29 gmurray71 Exp $ */ package com.sun.javaee.blueprints.bpcatalog.ajax; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; public class AutocompleteServlet extends HttpServlet { private ServletContext context; private HashMap employees = new HashMap(); public void init(ServletConfig config) throws ServletException { this.context = config.getServletContext(); employees.put("1", new EmployeeBean("1","Greg","Murray")); employees.put("2", new EmployeeBean("2","Greg","Murphy")); employees.put("3", new EmployeeBean("3","George","Murphy")); employees.put("4", new EmployeeBean("4","George","Murray")); employees.put("5", new EmployeeBean("5","Peter","Jones")); employees.put("6", new EmployeeBean("6","Amber","Jones")); employees.put("7", new EmployeeBean("7","Amy","Jones")); employees.put("8", new EmployeeBean("8","Bee","Jones")); employees.put("9", new EmployeeBean("9","Beth","Johnson")); employees.put("10", new EmployeeBean("10","Cindy","Johnson")); employees.put("11", new EmployeeBean("11","Cindy","Murphy")); employees.put("12", new EmployeeBean("12","Duke","Hazerd")); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { String action = request.getParameter("action"); String targetId = request.getParameter("id"); StringBuffer sb = new StringBuffer(); if (targetId != null) targetId = targetId.trim().toLowerCase(); boolean namesAdded = false; if ("complete".equals(action)) { Iterator it = employees.keySet().iterator(); while (it.hasNext()) { String id = (String)it.next(); EmployeeBean e = (EmployeeBean)employees.get(id); // simple matching only for start of first or last name if ((targetId != null) && (e.getFirstName().toLowerCase().startsWith(targetId) || e.getLastName().toLowerCase().startsWith(targetId)) && !targetId.equals("")) { sb.append("<employee>"); sb.append("<id>" + e.getId() + "</id>"); sb.append("<firstName>" + e.getFirstName() + "</firstName>"); sb.append("<lastName>" + e.getLastName() + "</lastName>"); sb.append("</employee>"); namesAdded = true; } } if (namesAdded) { response.setContentType("text/xml"); response.setHeader("Cache-Control", "no-cache"); response.getWriter().write("<employees>" + sb.toString() + "</employees>"); } else { //nothing to show response.setStatus(HttpServletResponse.SC_NO_CONTENT); } } if ("lookupbyname".equals(action)) { Iterator it = employees.keySet().iterator(); ArrayList names = new ArrayList(); while (it.hasNext()) { String id = (String)it.next(); EmployeeBean e = (EmployeeBean)employees.get(id); // simple matching only for start of first or last name if (e.getFirstName().toLowerCase().startsWith(targetId) || e.getLastName().toLowerCase().startsWith(targetId)) { names.add(e); } } if (names.size() > 0) { request.setAttribute("employees", names); } context.getRequestDispatcher("/employees.jsp").forward(request, response); } else if ("lookup".equals(action)) { // put the target employee in the reqeust scope to display if ((targetId != null) && employees.containsKey(targetId.trim())) { request.setAttribute("employee", employees.get(targetId)); context.getRequestDispatcher("/employee.jsp").forward(request, response); } else { context.getRequestDispatcher("/error.jsp").forward(request, response); } } } }