for (int j = 0; j < size; j++) {
    if (!line[j].getNewRecord() && !line[j+1].getNewRecord()) {
     if (line[j].getBoxQuantity() == 0L) {
      line[j].setBoxQuantity(null);
     }
     if (line[j].getMiniQuantity() == 0L) {
      line[j].setMiniQuantity(null);
     }
     if (line[j].getQuantity() == 0D) {
      line[j].setQuantity(null);
     }
     rowList.add(line[j]);
    }
    if (j == rowId && !line[j].getNewRecord()) {
     
       
       CreateDeliveryLineRow row = new CreateDeliveryLineRow();
       BeanUtils.copyProperties(row,line[j]);
       row.setQuantity(null);
       row.setMfgLot(null);
       row.setMiniQuantity(null);
       row.setBoxQuantity(null);
       rowList.add(row);
      //rowList.add(cdr);
    }

   }
  }

 <welcome-file-list>
    <welcome-file>search.jsp</welcome-file>
 </welcome-file-list>

2.dwr.xml
 <dwr>
    <allow><convert convert="bean"  match="dwr.sample.Apartment"/>
    <create>
           <creator="new" javascript="ApartmentDAO" class="dwr.sample.ApartmentDAO">
                  <include method="findApartments"/>
                  <include method="countApartments"/>
           </creator>
    </create>
    </allow>
</dwr>
3.DB
CREATE TABLE APARTMENTS (id INTEGER, bedrooms INTEGER, bathrooms INTEGER, price INTEGER, address VARCHAR, city VARCHAR, province VARCHAR);
INSERT INTO APARTMENTS VALUES (16001, 1, 1, 850, '123 King St. East', 'Toronto', 'ON');
INSERT INTO APARTMENTS VALUES (16002, 2, 1, 1000, '1023 Yonge Ave.', 'Toronto', 'ON');
INSERT INTO APARTMENTS VALUES (16003, 2, 2, 1050, '27 Winchester St.', 'Toronto', 'ON');
4.Apertment.java
普通的javabean
5.DBUtils.java
   数据库链接类
   public class DBUtils {

 /*
  * Creates the sample data (table and records).
  */
 public static void setupDatabase(BufferedReader reader) {
  Connection c = null;
  Statement stmt = null;
  try {
   c = openConnection();
   stmt = c.createStatement();
   // reads the file with the SQL statements
   String line;
   while ((line = reader.readLine()) != null) {
    stmt.execute(line);
   }
   stmt.close();
   c.close();
  } catch (IOException e) {
   e.printStackTrace();
  } catch (SQLException e) {
   e.printStackTrace();
  } finally {
   try {
    stmt.close();
    c.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
 }
 
 /*
  * Opens a database connection.
  */
 public static Connection openConnection() throws SQLException {
  Connection c = DriverManager.getConnection("jdbc:hsqldb:mem:dwr-sample", "sa", "");
  return c;
 }
 
}

6.ContextListener.java
   实现了ServletContextListerer接口的类
   public class ContextListener implements javax.servlet.ServletContextListener {

 /**
  * This method is invoked when the Web Application has been removed and is
  * no longer able to accept requests.
  * @param event
  */
 public void contextDestroyed(ServletContextEvent event) {
 }

 /**
  * This method is invoked when the Web Application is ready to service requests.
  * @param event
  */
 public void contextInitialized(ServletContextEvent event) {
  try {
   // load the driver
   Class.forName("org.hsqldb.jdbcDriver");
   // create the table and add sample data
   InputStreamReader in = new InputStreamReader(getClass().getClassLoader().getResourceAsStream("db.sql"));
   BufferedReader reader = new BufferedReader(in);
   DBUtils.setupDatabase(reader);
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }
  
 }

}
7.ApartmentDAO.java
   业务逻辑层
   public class ApartmentDAO {
 
 /**
  * Returns the available apartments based on the search criteria.
  * @param bedrooms minimum number of bedrooms
  * @param bathrooms minimum number of bathrooms
  * @param price maximum price to be paid
  * @return
  */
 public Collection findApartments(int bedrooms, int bathrooms, int price) {
  Collection list = new Vector();
  String sql = "select * from APARTMENTS" +
    createSearchWhereClause(bedrooms, bathrooms, price) +
    "order by bedrooms, bathrooms, price";

  // define db variables
  Connection c = null;
  Statement stmt = null;
  try {
   c = DBUtils.openConnection();
   stmt = c.createStatement();
   // just run the sql statement
   ResultSet rs = stmt.executeQuery(sql);
   while(rs.next()) {
    Apartment apartment = this.getApartment(rs);
    list.add(apartment);
   }
  } catch (SQLException e) {
   e.printStackTrace();
  } finally {
   try {
    stmt.close();
    c.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }

  return list;
 }
 
 /**
  * Returns the number of available apartments based on the search criteria.
  * @param bedrooms minimum number of bedrooms
  * @param bathrooms minimum number of bathrooms
  * @param price maximum price to be paid
  * @return
  */
 public int countApartments(int bedrooms, int bathrooms, int price) {
  String sql = "select count(*) as total from APARTMENTS" + createSearchWhereClause(bedrooms, bathrooms, price);
  int numberApartments = -1;
  // define db variables
  Connection c = null;
  Statement stmt = null;
  try {
   c = DBUtils.openConnection();
   stmt = c.createStatement();
   // just run the sql statement
   ResultSet rs = stmt.executeQuery(sql);
   if (rs.next()) {
    numberApartments = rs.getInt("total");
   }
  } catch (SQLException e) {
   e.printStackTrace();
  } finally {
   try {
    stmt.close();
    c.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }
  }
  
  return numberApartments;
 }
 
 /**
  * Creates a Unit object from the database.
  * @param rs
  * @return
  * @throws SQLException
  */
 private Apartment getApartment(ResultSet rs) throws SQLException {
  Apartment ap = new Apartment();
  ap.setId(rs.getInt("id"));
  ap.setAddress(rs.getString("address"));
  ap.setBedrooms(rs.getInt("bedrooms"));
  ap.setBathrooms(rs.getInt("bathrooms"));
  ap.setPrice(rs.getInt("price"));
  ap.setCity(rs.getString("city"));
  ap.setProvince(rs.getString("province"));
  return ap;
 }
 
 
 /**
  * Creates the where clause for the search SQL statement.
  * @param bedrooms
  * @param bathrooms
  * @param price
  * @return
  */
 private String createSearchWhereClause(int bedrooms, int bathrooms, int price) {
  String where = " where bedrooms >= " + bedrooms +
    " and bathrooms >= " + bathrooms +
    " and price < " + price;
  return where;
 }

}
8. search.jsp
  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
  <title>DWR Example</title>

   <style type="text/css" media="screen">
       @import url( style.css );
   </style> 
 
  <script src='dwr/interface/ApartmentDAO.js'></script>
  <script src='dwr/engine.js'></script>
  <script src='dwr/util.js'></script>
  <script>
 
  function updateTotal() {
    $("resultTable").style.display = 'none';
    var bedrooms = document.getElementById("bedrooms").value;
    var bathrooms = document.getElementById("bathrooms").value;
    var price = document.getElementById("price").value;
    ApartmentDAO.countApartments(loadTotal, bedrooms, bathrooms, price);
  }

  function updateResults() {
    DWRUtil.removeAllRows("apartmentsbody");
    var bedrooms = document.getElementById("bedrooms").value;
    var bathrooms = document.getElementById("bathrooms").value;
    var price = document.getElementById("price").value;
    ApartmentDAO.findApartments(fillTable, bedrooms, bathrooms, price);
    $("resultTable").style.display = '';
  }
 
  var getId = function(unit) { return unit.id };
  var getAddress = function(unit) { return unit.address };
  var getBedrooms = function(unit) { return unit.bedrooms };
  var getBathrooms = function(unit) { return unit.bathrooms };
  var getPrice = function(unit) { return unit.price };
   
  function loadTotal(data) {
    document.getElementById("totalRecords").innerHTML = data;
  }
 
  function fillTable(apartment) {
    DWRUtil.addRows("apartmentsbody", apartment, [ getId, getAddress, getBedrooms, getBathrooms, getPrice ]);
  }
 
</script>

</head>

<body onload="updateTotal();">

<h2>Find an apartment to rent</h2>

<table border="0">
<form name="rentalForm">
  <tr width="400">
   <td width="100">City</td>
   <td width="300">Toronto</td>
  </tr>
  <tr>
   <td>Beds</td>
   <td>
    <select id="bedrooms" onchange="updateTotal()">
     <option value="1">1 or more</option>
     <option value="2">2 or more</option>
     <option value="3">3 or more</option>
     <option value="4">4 or more</option>
    </select>
   </td>
  </tr>

  <tr>
   <td>Baths</td>
   <td>
    <select id="bathrooms" onchange="updateTotal()">
     <option value="1">1 or more</option>
     <option value="2">2 or more</option>
     <option value="3">3 or more</option>
     <option value="4">4 or more</option>
    </select>
   </td>
  </tr>

  <tr>
   <td>Price</td>
   <td>
    <select id="price" onchange="updateTotal()">
     <option value="800">under $800</option>
     <option value="1000">under $1,000</option>
     <option value="1250">under $1,250</option>
     <option value="1500" selected="selected">under $1,500</option>
     <option value="1800">under $1,800</option>
     <option value="2000">under $2,000</option>
    </select>
   </td>
  </tr>

  <tr>
   <td colspan="2">
    <blockquote>
     Available apartments: <span id="totalRecords" style="font-weight:bold;"></span>
    </blockquote>
   </td>
  </tr>

</form>
</table>

<p><input type="button" value="Show results!" onClick="updateResults();"></p>

<div id="resultTable">

<h2>Results</h2>

 <table border="1">
  <thead>
    <tr>
      <th width="40">Id</th>
      <th width="180">Address</th>
      <th width="60">Beds</th>
      <th width="60">Baths</th>
      <th width="60">Price</th>
    </tr>
  </thead>
  <tbody id="apartmentsbody">

  </tbody>
 </table>
</div>

</body>
</html>

由于项目需要,需在我们现有的struts、hibernate工程上集成ajax功能.项目组决定使用Dwr.
刚开始研究Dwr.觉得真的很不错, 只需很少量的代码,就能在现有的工程上集成ajax技术. 期待Dwr有更辉煌的明天！
喜欢Dwr技术的IT界朋友可以与本人联系！望提出好的意见与建议.

eclipse -vmargs -Xmx<memory size>

with the <memory size> value set to greater than "256M" (256 megabytes -- the default).

When using a Sun VM, you may also need to increase the size of the permanent generation memory. The default maximum is 64 megabytes, but more may be needed depending on your plug-in configuration and use. The maximum permanent generation size is increased using the -XX:MaxPermSize=<memory size> argument:

eclipse -vmargs -XX:MaxPermSize=<memory size>

Note that setting memory sizes to be larger than the amount of available physical memory on your machine will cause Java to "thrash" as it copies objects back and forth to virtual memory, which will severely degrade your performance.

在eclipse安装根目录下，用此命令:    eclipse.exe -vmargs -Xms256M -Xmx512M

         如果说我这两年在Sun公司作了哪些对中国开发人员有益的事的话，我想Java API文档中文版毫无疑问的应该算第一个。我非常清楚仍然有众多开发人员坚持认为一个好的程序员应该完全参考英文版的文档，但是我坚信该文档的中文版有其存在的意义，因为 Java作为一种程序设计语言，我们希望能够有更多的开发人员——而不仅仅是那些能够熟练阅读英语的清华北大毕业生——来使用它，掌握它，精通它。

也可以这么说，Java语言的前途，更多取决于草根，而不是精英。

——Sun中国技术社区总负责人，蒋清野