BlogJava-蝸ゼ牜ご赽跑的Blog-随笔分类-Spring

Struts2+spring2+hibernate3整合方案

flustar — Tue, 25 Dec 2007 17:11:00 GMT

摘要: Struts2+Spring2+hibernate3整合方案阅读全文

flustar 2007-12-26 01:11 发表评论

基于spring+dwr+xml无刷新投票(调查)系统

flustar — Mon, 19 Nov 2007 10:04:00 GMT

一、建立xml的数据结构，文件名为：vote.xml，内容如下：

在你的web应用的根目录建立xml文件夹，将其拷贝到该目录下。

二、建立xml对应的bean

/**

* @author flustar

* @version 创建时间：Jul 11, 2007 5:17:53 PM

* 类说明

……………………………………………………………………….

public class VoteBean {

private String voteId;

private String name;

private String voteCount;

private String voteTotalCount;

private String percentum;

public VoteBean() {

}

public String getPercentum() {

return percentum;

}

public void setPercentum(String percentum) {

this.percentum = percentum;

}

public String getVoteId() {

return voteId;

}

public void setVoteId(String voteId) {

this.voteId = voteId;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getVoteCount() {

return voteCount;

}

public void setVoteCount(String voteCount) {

this.voteCount = voteCount;

}

三、建立处理具体逻辑的service

package com.flustar.service;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.text.NumberFormat;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.jdom.Attribute;

import org.jdom.Document;

import org.jdom.Element;

import org.jdom.input.SAXBuilder;

import org.jdom.output.Format;

import org.jdom.output.XMLOutputter;

import org.jdom.xpath.XPath;

import com.flustar.web.beans.VoteBean;

import com.flustar.web.config.ContextConfig;

public class VoteService {

private Element root, vote;

private Document doc;

private Attribute voteTotalCount;

private VoteBean voteBean;

private List voteBeanList;

private String path = ContextConfig.getContextPath()

+ "/xml/vote.xml";

public void buildDoc() throws Exception {

FileInputStream fi = null;

fi = new FileInputStream(path);

SAXBuilder sb = new SAXBuilder();

doc = sb.build(fi);

}

public void formatDoc() throws Exception {

Format format = Format.getCompactFormat();

format.setEncoding("UTF-8");// 设置xml文件的字符为UTF-8

format.setIndent(" ");// 设置xml文件缩进为4个空格

XMLOutputter xmlOut = new XMLOutputter(format);

xmlOut.output(doc, new FileOutputStream(path));

}

public String floatToPercentum(Double doubleNum) {

NumberFormat numberFormat = NumberFormat.getPercentInstance();

numberFormat.setMinimumFractionDigits(2);

// numberFormat.setMaximumIntegerDigits(2);

String str = numberFormat.format(doubleNum);

//System.out.println(str);

return str;

}

public void updateVoteCount(String voteId) throws Exception {

buildDoc();

root = doc.getRootElement();

vote = (Element) XPath.selectSingleNode(root, "//vote[@voteId='"

+ voteId + "']");

int voteCount = Integer.parseInt(vote.getAttributeValue("voteCount")) + 1;

//System.out.println(voteCount);

vote.setAttribute("voteCount", String.valueOf(voteCount));

int totalCount = Integer.parseInt(root

.getAttributeValue("voteTotalCount")) + 1;

voteTotalCount = new Attribute("voteTotalCount", String

.valueOf(totalCount));

root.setAttribute(voteTotalCount);

System.out.println(totalCount);

formatDoc();

updateAllVoteCount();//更新所有的百分比

}

public void updateAllVoteCount()throws Exception{

buildDoc();

root=doc.getRootElement();

int totalCount = Integer.parseInt(root

.getAttributeValue("voteTotalCount"));

List voteList=XPath.selectNodes(root,"/votes/vote");

for(int i=0;i

vote=(Element)voteList.get(i);

int voteCount = Integer.parseInt(vote.getAttributeValue("voteCount"));

System.out.println(voteCount);

vote.setAttribute("voteCount", String.valueOf(voteCount));

vote.setAttribute("percentum", floatToPercentum(1.0 * voteCount

/ totalCount));

}

formatDoc();

}

public List getAllVote() throws Exception {

buildDoc();

voteBeanList = new ArrayList();

root = doc.getRootElement();

String totalCount = root.getAttributeValue("voteTotalCount");

List voteList = root.getChildren();

Iterator i = voteList.iterator();

while (i.hasNext()) {

voteBean = new VoteBean();

voteBean.setVoteTotalCount(totalCount);

vote = (Element) i.next();

String name = vote.getAttributeValue("name");

String voteCount = vote.getAttributeValue("voteCount");

String percentum = vote.getAttributeValue("percentum");

voteBean.setName(name);

voteBean.setVoteCount(voteCount);

voteBean.setPercentum(percentum);

voteBeanList.add(voteBean);

}

return voteBeanList;

}

public String getVoteTotalCount() {

return voteTotalCount;

}

public void setVoteTotalCount(String voteTotalCount) {

this.voteTotalCount = voteTotalCount;

}

四、获取上下文路径的listener

package com.flustar.web.listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import com.flustar.web.config.ContextConfig;

public class ConfigLoadContextListener implements ServletContextListener{

public void contextDestroyed(ServletContextEvent arg0) {

// TODO Auto-generated method stub

}

public void contextInitialized(ServletContextEvent contextEvent) {

// TODO Auto-generated method stub

String contextPath = contextEvent.getServletContext().getRealPath("/");

ContextConfig.setContextPath(contextPath);

}

………………………………………………………..

……………………………………………………………

public class ContextConfig {

private static String contextPath;

public static String getContextPath() {

return contextPath;

}

public static void setContextPath(String contextPath) {

ContextConfig.contextPath = contextPath;

}

……………………………………………………………………

………………………………………………………………..

}

五、在applicationContext-service.xml中注册VoteService

六、注册xml，在你的web应用的WEB-INFO目录下建立applicationContext-dwr.xml文件，内容为：

七、修改web.xml

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

version="2.4">

…………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………..

contextConfigLocation

…………………………………..

/WEB-INF/classes/applicationContext-service.xml

……………………………………………………………………………………………………………………………………………. com.flustar.web.listener.ConfigLoadContextListener

…………………………………………………………………………………………………………………………………………….

dwr-invoker

org.directwebremoting.servlet.DwrServlet

debug

true

dwr-invoker

/dwr/*

…………………………………………………………………………………………………………………………………………….

八、jsp页面

<%@ page contentType="text/html; charset=gbk" language="java" import="java.sql.*" errorPage="" %>

投票系统

你使用最多的一门语言是？

C语言

c++

java

汇编语言

投票结果

投票结果
语言	百分比	票数

共条投票

[关闭窗口]

flustar 2007-11-19 18:04 发表评论

分享一个spring+hibernate的通用分页类

flustar — Tue, 13 Nov 2007 02:50:00 GMT

时间过得真快，已经半年没有更新自己的博客了。好了，言归正传。大家都知道网上广为流传的一个分页类是：PaginationSupport.java其源代码如下：

public class PaginationSupport{

public final static int PAGESIZE = 30;

private int pageSize = PAGESIZE;

private List items;

private int totalCount;

private int[] indexes = new int[0];

private int startIndex = 0;

public PaginationSupport(List items, int totalCount) {
  setPageSize(PAGESIZE);
  setTotalCount(totalCount);
  setItems(items);
  setStartIndex(0);
}

public PaginationSupport(List items, int totalCount, int startIndex) {
  setPageSize(PAGESIZE);
  setTotalCount(totalCount);
  setItems(items);
  setStartIndex(startIndex);
}

public PaginationSupport(List items, int totalCount, int pageSize,
   int startIndex) {
  setPageSize(pageSize);
  setTotalCount(totalCount);
  setItems(items);
  setStartIndex(startIndex);
}

public List getItems() {
return items;
}

public void setItems(List items) {
this.items = items;
}

public int getPageSize() {
return pageSize;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

public int getTotalCount() {
return totalCount;
}

public int[] getIndexes() {
return indexes;
}

public void setIndexes(int[] indexes) {
this.indexes = indexes;
}

public int getStartIndex() {
return startIndex;
}

public void setStartIndex(int startIndex) {
  if (totalCount <= 0)
   this.startIndex = 0;
  else if (startIndex >= totalCount)
   this.startIndex = indexes[indexes.length - 1];
  else if (startIndex < 0)
   this.startIndex = 0;
  else {
   this.startIndex = indexes[startIndex / pageSize];
  }
}

public int getNextIndex() {
  int nextIndex = getStartIndex() + pageSize;
  if (nextIndex >= totalCount)
   return getStartIndex();
  else
   return nextIndex;
}

public int getPreviousIndex() {
  int previousIndex = getStartIndex() - pageSize;
  if (previousIndex < 0)
   return 0;
  else
   return previousIndex;
}

public int getPageCount() {
  int count = totalCount / pageSize;
  if (totalCount % pageSize > 0)
   count++;
  return count;
}

public int getCurentPageNum() {
return getStartIndex() / pageSize + 1;
}

}
在这个分页类中设定了每页要显示的记录数以及开始索引，如果用普通的jsp来取这个分页类的数据还可以，但是使用spring+hibernate这种架构就显得比较麻烦（原因是spring MVC返回的是一个 PaginationSupport的对象，使用jstl作为前端显示的话，会在jsp页面中掺杂大量的计算，像下一页索引，共多少条记录，当前第几页，共多少页等等会使jsp很难维护）下面是对这个类的改进：

public class PaginationSupport {
public final static int PAGESIZE = 30;

private int pageSize = PAGESIZE;

private int totalCount;

private int currentPage;

private int startIndex;

private int[] indexes = new int[0];

private int nextIndex;

private int previousIndex;

private int pageCount;

private List items;

private int lastIndex;

public  PaginationSupport(int pageSize,
   int startIndex) {
  setPageSize(pageSize);
  setStartIndex(startIndex);

}

public  PaginationSupport(List items, int totalCount) {
  setPageSize(PAGESIZE);
  setTotalCount(totalCount);
  setItems(items);
  setStartIndex(0);

}

public  PaginationSupport(List items, int totalCount, int startIndex) {
  setPageSize(PAGESIZE);
  setTotalCount(totalCount);
  setItems(items);
  setStartIndex(startIndex);

}

public  PaginationSupport(List items, int totalCount, int pageSize,
   int startIndex) {
  setPageSize(pageSize);
  setTotalCount(totalCount);
  setItems(items);
  setStartIndex(startIndex);

}

public void setTotalCount(int totalCount) {
  if (totalCount > 0) {
   this.totalCount = totalCount;
   int count = totalCount / pageSize;
   if (totalCount % pageSize > 0)
    count++;
   indexes = new int[count];
   for (int i = 0; i < count; i++) {
    indexes[i] = pageSize * i;
   }
    } else {
   this.totalCount = 0;
  }
}
public int getTotalCount() {
  return totalCount;
}
public void setIndexes(int[] indexes) {
  this.indexes = indexes;
}
public int[] getIndexes() {
  return indexes;
}

public void setNextIndex(int nextIndex) {
  this.nextIndex = nextIndex;
}
public int getNextIndex() {
  int nextIndex = getStartIndex() + pageSize;
  if (nextIndex >= totalCount)
   return getStartIndex();
  else
   return nextIndex;
}
public void setPreviousIndex(int previousIndex) {
  this.previousIndex = previousIndex;
}

public int getPreviousIndex() {
  int previousIndex = getStartIndex() - pageSize;
  if (previousIndex < 0)
   return 0;
  else
   return previousIndex;
}
public void setPageCount(int pageCount) {
  this.pageCount = pageCount;
}
public int getPageCount() {
  int count = totalCount / pageSize;
  if (totalCount % pageSize > 0)
   count++;
  return count;
}

public int getCurrentPage() {
return getStartIndex() / pageSize + 1;
}

public void setCurrentPage(int currentPage) {
  this.currentPage = currentPage;
}

public void setLastIndex(int lastIndex) {
  this.lastIndex =lastIndex ;
}
public int getLastIndex() {
  return indexes[indexes.length-1];
}

public int getPageSize() {
return pageSize;
}

public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}

public List getItems() {
return items;
}

public void setItems(List items) {
this.items = items;
}

}
以上是分页的封装类，下面是支持分页查询的方法：
1）
public PaginationSupport findPageByCriteria(
   final DetachedCriteria detachedCriteria, final int pageSize,
   final int startIndex) {
  return (PaginationSupport) getHibernateTemplate().execute(
    new HibernateCallback() {
     public Object doInHibernate(Session session)
       throws HibernateException {
      Criteria criteria = detachedCriteria
        .getExecutableCriteria(session);
      int totalCount = ((Integer) criteria.setProjection(
        Projections.rowCount()).uniqueResult())
        .intValue();
      criteria.setProjection(null);
      List items = criteria.setFirstResult(startIndex)
        .setMaxResults(pageSize).list();
      PaginationSupport ps = new PaginationSupport(items,
        totalCount, pageSize, startIndex);
      return ps;
     }
    }, true);
}
2）
public PaginationSupport findPageByQuery( final String hsql, final int pageSize,final int startIndex){
     return (PaginationSupport)getHibernateTemplate().execute(
     new HibernateCallback() {
       public Object doInHibernate(Session session) throws HibernateException, SQLException {
             Query query = session.createQuery(hsql);
             int totalCount=query.list().size();
             query.setFirstResult(startIndex);
             query.setMaxResults(pageSize);
             List items = query.list();
          PaginationSupport ps = new PaginationSupport(items,
       totalCount, pageSize, startIndex);
          return ps;

             }
       },true);
  }
你也许会问分页查询为什么会提供两个方法，这两个方法有区别吗？其实这两个方法并无本质区别，DetachedCriteria 也是构造查询语句的与Query功能一致，但是它提供了更加面向对象的方法来写hsql语句。一般人们都倾向第一种方法，但是这种方法并不通用，它有一种查询并不支持，那就是当你要查询的对象并不是一个单一对象的话（例如你在数据库中有两个表，一个是user,另一个是userinfo,这两个表所对应的对象在hiberante中被指定为共享主键的话，在执行查询的时候就会报类型转换异常，原因是查询出来的对象并不是user而是一个包含user 和userinfo的Object,你若强制把它转换成user类型，肯定会出错),这时你不得不采用第二个方法。当然这只是我个人见解，也许还有地方说的不是很准确，希望大家多多批评指正。
最后是这个分页类的前台显示源代码:
<%@ page language="java" contentType="text/html; charset=gbk"
    pageEncoding="GBK"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>

    显示所有用户

返回首页

显示所有用户
用户ID	用户名	用户昵称	电子邮件	注册时间	详细信息	用户充值记录	用户定制服务信息
${user.intId}	${user.username}	${user.name}	${user.email}		详细信息	用户充值记录	用户定制服务信息

     共${userPage.totalCount}记录


       首页


       首页




       上一页


       上一页




       下一页


       下一页




       最后一页


       最后一页


     每页显示${userPage.pageSize}条记录
     当前第${userPage.currentPage }/${userPage.pageCount}页

flustar 2007-11-13 10:50 发表评论

BlogJava-蝸ゼ牜ご赽跑 的Blog-随笔分类-Spring

Struts2+spring2+hibernate3整合方案

基于spring+dwr+xml无刷新投票(调查)系统

你使用最多的一门语言是？

C语言

c++

java

汇编语言

分享一个spring+hibernate的通用分页类

BlogJava-蝸ゼ牜ご赽跑的Blog-随笔分类-Spring