ajax技术中dwr的简单实例

/* * Copyright 2005 Joe Walker * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.getahead.dwrdemo.people; import java.util.HashSet; import java.util.Iterator; import java.util.Random; import java.util.Set; import org.directwebremoting.util.Logger; /** * A container for a set of people * @author Joe Walker [joe at getahead dot ltd dot uk] */ public class People { /** * Pre-populate with random people */ public People() { log.debug("Generating a new set of random people"); for (int i = 0; i < 5; i++) { people.add(getRandomPerson()); } } /** * Accessor for the current list of people * @return the current list of people */ public Set getAllPeople() { return people; } /** * Insert a person into the set of people * @param person The person to add or update */ public void setPerson(Person person) { log.debug("Adding person: " + person); if (person.getId() == -1) { person.setId(getNextId()); } people.remove(person); people.add(person); } /** * Delete a person from the set of people * @param person The person to delete */ public void deletePerson(Person person) { log.debug("Removing person: " + person); people.remove(person); debug(); } /** * the current list of people */ private Set people = new HashSet(); /** * Create a random person * @return a random person */ private Person getRandomPerson() { Person person = new Person(); person.setId(getNextId()); String firstname = FIRSTNAMES[random.nextInt(FIRSTNAMES.length)]; String surname = SURNAMES[random.nextInt(SURNAMES.length)]; person.setName(firstname + " " + surname); String housenum = (random.nextInt(99) + 1) + " "; String road1 = ROADS1[random.nextInt(ROADS1.length)]; String road2 = ROADS2[random.nextInt(ROADS2.length)]; String town = TOWNS[random.nextInt(TOWNS.length)]; String address = housenum + road1 + " " + road2 + ", " + town; person.setAddress(address); float salary = Math.round(10 + 90 * random.nextFloat()) * 1000; person.setSalary(salary); return person; } /** * List the current people so we know what is going on */ protected void debug() { for (Iterator it = people.iterator(); it.hasNext();) { Person person = (Person) it.next(); log.debug(person.toString()); } } /** * Get the next unique ID in a thread safe way * @return a unique id */ private static synchronized int getNextId() { return nextId++; } /** * The next ID, to get around serialization issues */ private static int nextId = 1; private Random random = new Random(); private static final String[] FIRSTNAMES = { "Fred", "Jim", "Shiela", "Jack", "Betty", "Jacob", "Martha", "Kelly", "Luke", "Matt", "Gemma", "Joe", "Ben", "Jessie", "Leanne", "Becky", }; private static final String[] SURNAMES = { "Sutcliffe", "MacDonald", "Duckworth", "Smith", "Wisner", "Iversen", "Nield", "Turton", "Trelfer", "Wilson", "Johnson", "Cowan", "Daniels", }; private static final String[] ROADS1 = { "Green", "Red", "Yellow", "Brown", "Blue", "Black", "White", }; private static final String[] ROADS2 = { "Close", "Drive", "Street", "Avenue", "Crescent", "Road", "Place", }; private static final String[] TOWNS = { "Birmingham", "Kettering", "Paris", "San Francisco", "New York", "San Mateo", "Barcelona", }; /** * The log stream */ private static final Logger log = Logger.getLogger(People.class); }