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Dwr---example

HandSoft — Sun, 21 Jan 2007 15:35:00 GMT

1. 在web.xml文�g中注册dwr

    dwr-invoker
    DWR Servlet
    Direct Web Remoter Servlet
    uk.ltd.getahead.dwr.DWRServlet

        debug
        true


    dwr-invoker
    /dwr/*

    search.jsp

2.dwr.xml










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�?br />   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

DWR Example

Find an apartment to rent

City	Toronto
Beds
Baths
Price
Available apartments:

Results

Id	Address	Beds	Baths	Price

�׃��目需�?需在我们现有的struts、hibernate工程上集成ajax功能.��目�l�决定��用Dwr.
刚开始研�I�Dwr.觉得真的很不�? 只需很少量的代码,��p��在现有的工程上集成ajax技�? 期待Dwr有更辉煌的明天！
喜欢Dwr技术的IT界朋友可以与本�h联系�Q�望提出好的意见与徏�?

HandSoft 2007-01-21 23:35 发表评论

eclipse增加内存

HandSoft — Tue, 26 Dec 2006 04:42:00 GMT

By default, Eclipse will allocate up to 256 megabytes of Java heap memory. This should be ample for all typical development tasks. However, depending on the JRE that you are running, the number of additional plug-ins you are using, and the number of files you will be working with, you could conceivably have to increase this amount. Eclipse allows you to pass arguments directly to the Java VM using the -vmargs command line argument, which must follow all other Eclipse specific arguments. Thus, to increase the available heap memory, you would typically use:

eclipse -vmargs -Xmx

with the 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= argument:

eclipse -vmargs -XX:MaxPermSize=

This argument may not be available for all VM versions and platforms; consult your VM documentation for more details.

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�Q�用此命�? eclipse.exe -vmargs -Xms256M -Xmx512M

HandSoft 2006-12-26 12:42 发表评论

Struts+Hibernate实现分页

HandSoft — Thu, 07 Dec 2006 16:53:00 GMT

1. 视图昄��(select.jsp)�Q�首��? 上一��? 下一��?/ ��N�� ${requestScope.page} / ${requestScope.pagecount} / 转到
2. ��面逻辑:
<%@ page language="java"%>
<%@ taglib uri=" prefix="bean"%>
<%@ taglib uri=" prefix="html"%>
<%@taglib uri="
<%@taglib uri="

JSP for SelectActionForm form

please input:

value="${requestScope.selectValue}" />

ID	Name	DESC	Date	CreateBy
${cddate.pageCategoryId}	${cddate.pageItemName}	${cddate.pageItemDesc}	${cddate.pageItemDate}	${cddate.pageItemBy}

href="selectAction.do?action=frist&selectValue=${requestScope.selectValue}">MainPage

        lastPage

                   href="selectAction.do?action=back&page=${requestScope.page}&selectValue=${requestScope.selectValue}">lastPage

        nextPage

                   href="selectAction.do?action=next&page=${requestScope.page}&selectValue=${requestScope.selectValue}">nextPage

href="selectAction.do?action=end&selectValue=${requestScope.selectValue}">endPage

${requestScope.page} / ${requestScope.pagecount}

        changeTo
                 onkeyup="value=value.replace(/[^\d]/g,'') "
         onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))"
         value="${requestScope.page}" />

3 . struts-config.xml文�g

4. SelectActionForm.java
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;

public class SelectActionForm
    extends ActionForm
{
     private String pageText;          //��面�~�码
     private String selectValue;       //查询条�g关键�?br />     public String getPageText()     //跌��{到的��面
     {
        return pageText;
     }

     public void setPageText(String pageText)
     {
         this.pageText = pageText;
     }

     public void setSelectValue(String selectValue)
     {
        this.selectValue = selectValue;
     }

     public String getSelectValue()
     {
         return selectValue;
     }

     public ActionErrors validate(ActionMapping actionMapping,
                                 HttpServletRequest httpServletRequest)
     { /** @todo: finish this method, this is just the skeleton.*/
         return null;
     }

     public void reset(ActionMapping actionMapping,
                      HttpServletRequest servletRequest)
     {
     }
}
5. SelectAction.java
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import com.wang.business.BusinessManage;
import com.wang.module.*;
import java.util.*;

public class SelectAction
    extends Action
{
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
    {
        SelectActionForm selectForm = (SelectActionForm) form;
        BusinessManage bm = new BusinessManage();
        int page = 1;    //初始化�ؓ�W�一��?/div>

        if (selectForm.getSelectValue() != null)
        {
            // if(request.getParameter("action")!=null)
            if (request.getParameter("page") == null)
            {
                page = 1;
            }
            else
            {

page = Integer.parseInt(request.getParameter("page"));
}

            if (selectForm.getPageText() != null)
            {
                page = Integer.parseInt(selectForm.getPageText());
            }
            if (request.getParameter("action") != null)
            {
                if (request.getParameter("action").equals("frist"))                 {   //跌��{到首��?br />                    page = 1;
                }
                else if (request.getParameter("action").equals("end"))                //跌��{到尾��?br />                {
                    page = bm.PAGECOUNT;
                }
                else if (request.getParameter("action").equals("back"))              //跌��{��C��一��?br />                {
                    page -= 1;
                }
                else if (request.getParameter("action").equals("next"))                //跌��{��C��一��?br />                {
                    page += 1;
                }
            }

            List list = bm.selectCDBean(selectForm.getSelectValue(), page, 5);   //��面传递三个参�?��取得的值存放于一个list列表�?br />            // ArrayList list1 = new ArrayList(list);
            request.getSession().setAttribute("selectList", list);     //��页码集合变量存放于字符串变量selectList�?存放于session范围�?br />            int pagecount = bm.PAGECOUNT;                         //��面��L��
            request.setAttribute("pagecount", pagecount);
            request.getSession().removeAttribute("selectList");
            request.getSession().setAttribute("selectList", list);
            request.setAttribute("selectValue", selectForm.getSelectValue());
            request.setAttribute("page", page);
            request.setAttribute("pagecount", pagecount);

        }
        else
        {
            request.getSession().removeAttribute("selectList");
        }
        bm.close();
        return mapping.findForward("select");
    }
}

6. 业务逻辑
BusinessManage.java
package com.wang.business;

import org.hibernate.*;
import org.hibernate.cfg.*;
import com.wang.module.*;
import java.util.*;

public class BusinessManage
{
    private SessionFactory sf = null;
    private Session s = null;
    private Transaction ts = null;
    private Query query = null;
    public static int PAGECOUNT;
    public BusinessManage()
    {
        sf = new Configuration().configure().buildSessionFactory();
        s = sf.openSession();
        ts = s.beginTransaction();
    }

    public void openSession()
    {
        s = sf.openSession();
    }

    public List selectCDBean(String value, int page, int count)
    {
        List list = null;
        int pagelast = 0;
        try
        {
            query = s.createQuery("from ViewPage cd where cd.pageItemName like '%"
     + value + "%'");

            if (query.list().size() / count == 0)   //��|��为偶�?br />            {
                PAGECOUNT = query.list().size() / count; //��面��L��
            }
            else
            {
                PAGECOUNT = query.list().size() / count + 1;   //��|��为基�?br />                pagelast = query.list().size() / count;
            }
            int begin = page * count - count;   //count为每��|��C�的�U�录�?
            int end = page * count;
            if (page == PAGECOUNT)
            {
                end = query.list().size();
            }
            list = query.list().subList(begin, end);
        }
        catch (Exception ex)
        {
            list = null;
            ex.printStackTrace();
        }
        return list;
    }

    public void close()
    {
        s.close();
    }
}

HandSoft 2006-12-08 00:53 发表评论

HandSoft — Wed, 27 Sep 2006 06:16:00 GMT

本�h毕业于西安电子科技大学�Q�本�U�。热��p�Y件开发，�_�N��JAVA .熟悉Struts,Spring,Hibernate,Jboss,Eclipse�{�多�U�开源技术�?br />��C��要从事于Oracle相关产品的开发。有着ERP,CRM,MES�pȝ��的开发经验，目前正着手于Struts与Ajax技术的集成�pȝ��的开发，
官方�l�出的AjaxTags也只是测试版�Q�此技术正处于��h��阶段。望�Ҏ��技术有研究的朋友与我联�p�，�l�出指点�?br />真诚�l�交IT届同仁，共同学习�Q�共同交��。构建和谐社会�?br />QQ: 541638655
MSN: jucracker@hotmail.com
Phone: 13817080595

HandSoft 2006-09-27 14:16 发表评论

HandSoft — Fri, 28 Jul 2006 01:33:00 GMT

引言:

如果说我�q�两�q�在Sun公司作了哪些对中国开发�h员有益的事的话，我想Java API文��中文版毫无疑问的应该��第一个。我非常清楚仍然有众多开发�h员坚持认��Z��个好的程序员应该完全参考英文版的文��，但是我坚信该文��的中文版有其存在的意义，因�ؓ Java作�ؓ一�U�程序设计语�a��Q�我们希望能够有更多的开发�h员——而不仅仅是那些能够熟�l�阅读英语的清华北大毕业生——来使用它，掌握它，�_�N��它�?/font>

也可以这么说�Q�Java语言的前途，更多取决于草根，而不是精英�?/font>

——Sun中国技术社区总负责�h�Q�蒋清野

Java API Docs是学习和使用Java语言中最�l�常使用的参考资料之一�Q�完整的Java API文档中文版文��共包括32个类库。但是长期以来此文档只有英文版和日文版，对于中国地区的Java开发者来说相当的不便。通过Sun公司的翻译团�?0个月的不懈努力以及广大网友的热心支持�Q�Java API中文文��的翻译工作如期完成，呈现��C��国广大的Java用户和学习者面�?br />
http://java.csdn.net/subject/Java%20API/index.html

HandSoft 2006-07-28 09:33 发表评论

Open Workbench

HandSoft — Fri, 28 Jul 2006 01:28:00 GMT

Open Workbench�Q�MS Project的杀�?br />来自开源社区的Open Workbench有着与Microsoft Project相匹敌的丰富功能。虽然它�q�不能像Microsoft Project那样�Q�提供支持C/S�l�构下的企业�U�多人协作的��目��理模式。但在单��Z��用的情况下，可以满��多数开发团队的��目��理需求�?img height="94" alt="t_IBM.jpg" src="http://www.aygfsteel.com/images/blogjava_net/gavinju/13429/t_IBM.jpg" width="120" border="0" />

HandSoft 2006-07-28 09:28 发表评论

Compiere ERP&CRM

HandSoft — Thu, 27 Jul 2006 11:54:00 GMT

Compiere ERP&CRM为全球范围内的中��型企业提供�l�合型解��x��案，覆盖从客��L��理、供应链到胦务管理的全部领域�Q�支持多�l�织、多币种、多会计模式、多成本计算、多语种、多�E�制�{�国际化�Ҏ��。易于安装、易于实施、易于��用。只需要短短几个小�Ӟ��您就可以使用甌��-采购-发票-付款、报�?订单-发票-收款、��品与定�h、资产管理、客户关�p�R��供应商关系、员工关�p�R��经营业�l�分析等强大功能了�?br />
http://www.compiere.org/

HandSoft 2006-07-27 19:54 发表评论