BlogJava-焕JAVA超-随笔分类-Java webhttp://www.blogjava.net/silvernapoleon/category/13466.htmlJava & Warcraft IIIzh-cnTue, 27 Feb 2007 11:59:09 GMTTue, 27 Feb 2007 11:59:09 GMT60java.util.ArrayListhttp://www.blogjava.net/silvernapoleon/archive/2006/09/16/70010.htmlCrespoCrespoSat, 16 Sep 2006 02:28:00 GMThttp://www.blogjava.net/silvernapoleon/archive/2006/09/16/70010.htmlhttp://www.blogjava.net/silvernapoleon/comments/70010.htmlhttp://www.blogjava.net/silvernapoleon/archive/2006/09/16/70010.html#Feedback1http://www.blogjava.net/silvernapoleon/comments/commentRss/70010.htmlhttp://www.blogjava.net/silvernapoleon/services/trackbacks/70010.html   数组和数组列表之间有着重大的区别。数组是Java语言的一个特征，对于每个元素类型T，都有数组类型T[];然而，ArrayList类是个定义java.util包中的类库。这是一个存放object类型元素的"普通性"的类型。要注意的是，要从数组列表中提取元素时，需要进行类型转换。
  使用add方法可以向数组列表中添加新元素：
   ArrayList staff = new ArrayList();
   staff.add(new Employee(....));
   staff.add(new Employee(....));
   ArrayList类管理了一个Object引用的内部数组。最终，可能会用完数组的空间。如果调用了add，而内部数组已经满了，数组列表将自动创建了一个更大的数组，并自动把小数组中的对象拷贝到大数组中
  Size方法返回数组列表的实际元素个数
    staff.size()    它等价于数组a的a.length   
   访问数组列表元素
因为 ArrayList类不是Java语言的一部分，它只是个提供在标准库中、由某人编写的工具类，并不像在访问数组元素时可以使用[]语法那

样，要存取或改变数组元素，你必须使用get和set方法
   要设置第i个元素，需要使用：
   staff.set(i,harry);
得到数组列表元素要更复杂一些，因为get方法返回的类型是Object，你还需要把它转换为想要的类型
   Employee e = (Employee)staff.get(i); 它等价于Employee e = a[i];

   最后总结一下：
 无需指定数组大小
用add增添任意多的元素;
用size()代替length计算元素的个数;
用(Employee)a.get(i)代替a[i]访问元素i;

public  Collection setRollBack(QueueVB job)  throws  CustomException
     {
        
        String sqlselect  =   " select FileName from JobQueue where BatchNum= " + job.getBatchNum() + "  and DocTypeID= " + job.getDocTypeID() + " and JobState='6' " ;
        String sql  =   " update JobQueue set JobState= " + JobState.SAVE + "  where BatchNum= " + job.getBatchNum() + "  and DocTypeID= " + job.getDocTypeID() + "  and JobNum= " + job.getJobNum() + "" ;
        ArrayList array = new  ArrayList();
        System.out.println(sql);
                 try
                 {
                    getConnection = ConnectionLocator.getInstance().getConnection(strJNDI);
                    ResultSet rs = null ;
                     if (getConnection != null )
                     {
                        PreparedStatement pstmt1 = getConnection.prepareStatement(sqlselect);
                        PreparedStatement pstmt = getConnection.prepareStatement(sql);
                        
                        rs  =  pstmt1.executeQuery();
                        pstmt.executeUpdate();
                         while (rs.next())
                         {
                            String fileName  =  rs.getString( " FileName " );
                            FileNameVB filenameVB  =   new  FileNameVB();//将得到的“文件名“进行封装
                            filenameVB.setFileName(fileName);
                            array.add(filenameVB);
                         }
                         try
                         {
                            pstmt.close();
                        }
                         catch (SQLException e)
                         { throw   new  CustomException(e.getMessage(), " exs " );}
                         try
                         {
                            getConnection.close();
                        }
                         catch (SQLException e)
                         { throw   new  CustomException(e.getMessage(), " exs " );}
                    }
                }
                 catch (SQLException e)
                 { throw   new  CustomException(e.getMessage(), " ex00050 " );}
                 return  array;
    }
读取arraylist里的值
Collection m  = inputFacade.setRollBack(job);
                    ArrayList array = (ArrayList)m;
                    for(int i=0;i<array.size();i++)
                    {   
                        filenameVB = (FileNameVB)array.get(i);


Crespo 2006-09-16 10:28 发表评论
]]>在WebSphere做的事务回滚的实例http://www.blogjava.net/silvernapoleon/archive/2006/08/20/64593.htmlCrespoCrespoSun, 20 Aug 2006 03:35:00 GMThttp://www.blogjava.net/silvernapoleon/archive/2006/08/20/64593.htmlhttp://www.blogjava.net/silvernapoleon/comments/64593.htmlhttp://www.blogjava.net/silvernapoleon/archive/2006/08/20/64593.html#Feedback0http://www.blogjava.net/silvernapoleon/comments/commentRss/64593.htmlhttp://www.blogjava.net/silvernapoleon/services/trackbacks/64593.html /*
 * Created on 2006-8-16
 *
 * To change the template for this generated file go to
 * Window&gt;Preferences&gt;Java&gt;Code Generation&gt;Code and Comments
  */
package  com.belstar.crocodile.input;

 import  java.sql.Connection;
 import  java.sql.PreparedStatement;
 import  java.sql.ResultSet;
 import  java.sql.SQLException;
 import  java.sql.Statement;
 import  java.text.DateFormat;
 import  java.util.Hashtable;
 import  java.util.Properties;

 import  javax.jms.QueueConnection;
 import  javax.jms.QueueConnectionFactory;
 import  javax.naming.Context;
 import  javax.naming.InitialContext;
 import  javax.naming.NamingException;
 import  javax.sql.DataSource;
 import  javax.transaction.UserTransaction;

 import  com.belstar.crocodile.scan.JobQueueVB;
 import  com.belstar.crocodile.util.ConnectionLocator;
 import  com.belstar.crocodile.util.JndiNames;
 import  com.belstar.crocodile.util.JobState;

 /**
 *  @author  Administrator
 *
 * To change the template for this generated type comment go to
 * Window&gt;Preferences&gt;Java&gt;Code Generation&gt;Code and Comments
  */
public   class  Test  {
     private  String strJNDI  =   " jdbc/Crocodile " ;

     private   static  java.sql.Connection getConnection;
     private  DateFormat dateFormat  =  DateFormat.getDateInstance();

     public  Test()  {
    }

     public  Test(String strJNDI)  {
         this .strJNDI  =  strJNDI;
        getConnection  =   null ;
    }
     public   void  mm(String d)  throws  SQLException, NamingException  {

        Hashtable ht  =   new  Hashtable();
        DataSource ds  =   null ;
        Statement stmt  =   null ;
        ResultSet rs  =   null ;
        Connection myConn  =   null ;
        UserTransaction tx  =   null ;

        String str1  =   " update fuck set id='222' where name='1' " ;
        String str2 = " select * from JobQueue where FileName = ' " + d + " ' and JobState= " + JobState.SAVEOK + "" ;
         try   {
            getConnection  =
                ConnectionLocator.getInstance().getConnection( " jdbc/Crocodile " );
            Properties p  =   new  Properties();

            p.put(
                Context.INITIAL_CONTEXT_FACTORY,
                 " com.ibm.websphere.naming.WsnInitialContextFactory " );
            p.put(Context.URL_PKG_PREFIXES,  " com.ibm.ws.naming " );
            p.put(Context.PROVIDER_URL,  " iiop://localhost:2809/ " );
            InitialContext ctx  =   new  InitialContext(p);
            System.out.println(JndiNames.DataSource  +  ctx);
            tx  =  (UserTransaction) ctx.lookup( " java:comp/UserTransaction " );
             // 连接工厂
            System.out.println(tx);
            tx.begin();
            PreparedStatement pstmt  =  getConnection.prepareStatement(str1);
             PreparedStatement pstmt1 = getConnection.prepareStatement(str2);
            System.out.println(str2);
            pstmt.executeUpdate(str1);
            rs  =  pstmt1.executeQuery(str2);
            rs.next();
             // System.out.println("22222222222222222"+rs.getString(""));
            System.out.println( " Success! " );
            tx.commit();
             // pstmt.close();
             // getConnection.close();
        }   catch  (Exception E)  {
             try   {
                tx.rollback();
            }   catch  (Exception e)  {
            }
            System.out.println( " 事务发生错误，事务被取消！  " );
        }

    }

}


Crespo 2006-08-20 11:35 发表评论
]]>Java.stream的应用http://www.blogjava.net/silvernapoleon/archive/2006/07/31/60983.htmlCrespoCrespoMon, 31 Jul 2006 04:12:00 GMThttp://www.blogjava.net/silvernapoleon/archive/2006/07/31/60983.htmlhttp://www.blogjava.net/silvernapoleon/comments/60983.htmlhttp://www.blogjava.net/silvernapoleon/archive/2006/07/31/60983.html#Feedback0http://www.blogjava.net/silvernapoleon/comments/commentRss/60983.htmlhttp://www.blogjava.net/silvernapoleon/services/trackbacks/60983.htmlbyte[] buffer = null;
int a = doc.getDocumentSize()*1024;
buffer = new byte[a];
int byteread=0;
FileOutputStream fos=new FileOutputStream(buffer.toString());
BufferedOutputStream bos=new BufferedOutputStream(fos);
bos.flush();
bos.close();
然后 将Buffer里的数据存到本地
bos.toString();
FileOutputStream fs=new FileOutputStream("c:/aaa"+"."+doc.getDefaultExtension());
byteread=inStream.read(buffer);
fs.write(buffer,0,byteread);
inStream.close();或是存到相对路径
FileOutputStream fis = new FileOutputStream(filePath1);

Crespo 2006-07-31 12:12 发表评论
]]>结合w3c.dom和jdom 用Java语言实现对Xml的创建，插入、修改、查询的实例http://www.blogjava.net/silvernapoleon/archive/2006/07/28/60468.htmlCrespoCrespoFri, 28 Jul 2006 01:26:00 GMThttp://www.blogjava.net/silvernapoleon/archive/2006/07/28/60468.htmlhttp://www.blogjava.net/silvernapoleon/comments/60468.htmlhttp://www.blogjava.net/silvernapoleon/archive/2006/07/28/60468.html#Feedback0http://www.blogjava.net/silvernapoleon/comments/commentRss/60468.htmlhttp://www.blogjava.net/silvernapoleon/services/trackbacks/60468.html在这里包就不写进来了
public class InputItem
{
 public boolean creatInputFile(String fileName) throws FileNotFoundException, IOException
 {  
  ItemVB itemVB= new ItemVB();
  InputItem a = new InputItem();
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  
  DocumentBuilder builder=null;
  try
  {
   builder = factory.newDocumentBuilder();
  }
  catch(ParserConfigurationException e)
  {
   e.printStackTrace();
  }
  
  org.w3c.dom.Document doc = null;
  doc = builder.newDocument();
  org.w3c.dom.Element root = doc.createElement("item");
  doc.appendChild(root);
  
  DOMBuilder builders = new DOMBuilder();
  org.jdom.Document Doc = builders.build(doc);
  XMLOutputter XMLOut = new XMLOutputter();
  XMLOut.output(Doc,new FileOutputStream(fileName));
  
  return true;
 }
 
 public boolean insertItem(String fileName,ItemVB vb) throws FileNotFoundException, IOException
 {
  ItemVB itemVB= new ItemVB();
  InputItem a = new InputItem(); 
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  DocumentBuilder builder=null;
  
  try
  {
   builder = factory.newDocumentBuilder();
  }
  catch (ParserConfigurationException e)
  {
   e.printStackTrace();
  }
  
  File f = new File(fileName);
  org.w3c.dom.Document doc=null; 
  
  try
  {
   doc = builder.parse(f);
  } catch (SAXException e1)
  {
   e1.printStackTrace();
  }
  catch (IOException e1)
  {
   e1.printStackTrace();
  }
  
  org.w3c.dom.Element root = doc.getDocumentElement();
  org.w3c.dom.Element eee = doc.createElement("id"+vb.getId());
  root.appendChild(eee);
  NodeList nameElements =  root.getElementsByTagName("id"+vb.getId());
  org.w3c.dom.Element nameElement = (org.w3c.dom.Element) nameElements.item(0);
  System.out.println(nameElement);
  System.out.println(eee);
  
  if(eee==nameElement)
  {

      org.w3c.dom.Element eee2 = doc.createElement("description");
   eee.appendChild(eee2);
   Text description = doc.createTextNode(vb.getDescription());
      eee2.appendChild(description);
      org.w3c.dom.Element eee3 = doc.createElement("value");
   eee.appendChild(eee3);
   Text value = doc.createTextNode(vb.getValue());
      eee3.appendChild(value);
      DOMBuilder builders = new DOMBuilder();
   org.jdom.Document Doc = builders.build(doc);
   XMLOutputter XMLOut1 = new XMLOutputter();
   XMLOut1.output(Doc,new FileOutputStream(fileName));
  }
  else
  {
   return false;
  }
  return true;
 }
 
 public boolean modifyItem(String fileName,ItemVB vb) throws FileNotFoundException, IOException
 {
  ItemVB itemVB= new ItemVB();
  InputItem a = new InputItem();
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  DocumentBuilder builder=null;
  XMLOutputter XMLOut = new XMLOutputter();
  File f = new File(fileName);
  
  try
  {
   builder = factory.newDocumentBuilder();
  }
  catch (ParserConfigurationException e)
  {
   e.printStackTrace();
  }
  
  org.w3c.dom.Document doc=null; 
  
  try
  {
   doc = builder.parse(f);
  } catch (SAXException e1)
  {
   e1.printStackTrace();
  }
  catch (IOException e1)
  {
   e1.printStackTrace();
  }
  
  DOMBuilder buuo = new DOMBuilder();
  Document doc1 = buuo.build(doc);
  
  org.w3c.dom.Element root = doc.getDocumentElement();
  NodeList nameElements =  root.getElementsByTagName("id"+vb.getId());
        org.w3c.dom.Element nameElement = (org.w3c.dom.Element) nameElements.item(0);
  
  if(nameElement!=null)
  { 
   org.w3c.dom.Element ddd = (org.w3c.dom.Element)nameElements.item(0);
   NodeList nameDescriptions= ddd.getElementsByTagName("description");
   org.w3c.dom.Element nameDescription = (org.w3c.dom.Element) nameDescriptions.item(0);
         Text nameText1 = (Text) nameDescription.getFirstChild();
   nameText1.setData(vb.getDescription());
   NodeList nameValue = root.getElementsByTagName("value");
   org.w3c.dom.Element nameValues = (org.w3c.dom.Element) nameValue.item(0);
   Text nameText2 = (Text) nameValues.getFirstChild();
   nameText2.setData(vb.getValue());
   DOMBuilder builders = new DOMBuilder();
   org.jdom.Document Doc = builders.build(doc);
   XMLOutputter XMLOut1 = new XMLOutputter();
   XMLOut1.output(Doc,new FileOutputStream(fileName));
  }
  else
  {
   return false;
  }
  return true; 
 }
 
 public ItemVB searchItem(String id,String fileName)
 {
  ItemVB itemVB = new ItemVB();
  InputItem a = new InputItem();
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  DocumentBuilder builder =null;
  XMLOutputter XMLOut = new XMLOutputter();
  File f = new File(fileName);
  
  try
  {
   builder = factory.newDocumentBuilder();
  }
  catch (ParserConfigurationException e)
  {
   e.printStackTrace();
  }
  
  org.w3c.dom.Document doc=null; 
  
  try
  {
   doc = builder.parse(f);
  } catch (SAXException e1)
  {
   e1.printStackTrace();
  }
  catch (IOException e1)
  {
   e1.printStackTrace();
  }
  
  DOMBuilder buuo = new DOMBuilder();
  Document doc1 = buuo.build(doc);
  
  org.w3c.dom.Element root = doc.getDocumentElement();
  NodeList nameElements =  root.getElementsByTagName("id"+id);
  org.w3c.dom.Element nameElement = (org.w3c.dom.Element) nameElements.item(0);
  
  if(nameElement!=null)
  { 
   org.w3c.dom.Element ddd = (org.w3c.dom.Element)nameElements.item(0);
   NodeList nameDescriptions= ddd.getElementsByTagName("description");
   org.w3c.dom.Element nameDescription = (org.w3c.dom.Element) nameDescriptions.item(0);
   Text nameText1 = (Text) nameDescription.getFirstChild();
   itemVB.setDescription(nameText1.getData());
   NodeList nameValue = root.getElementsByTagName("value");
   org.w3c.dom.Element nameValues = (org.w3c.dom.Element) nameValue.item(0);
   Text nameText2 = (Text) nameValues.getFirstChild();
   itemVB.setValue(nameText2.getData());
   itemVB.setId(id);
  }
  else
  {
   return null;
  }
  return itemVB;
 }
 
 public ArrayList creatIndexList(String indexFile,String itemFile)
    {

  ArrayList a= new ArrayList();
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  DocumentBuilder builder=null;
  File f = new File(indexFile);
  File f1 = new File(itemFile);
  try
  {
   builder = factory.newDocumentBuilder();
  }
  catch (ParserConfigurationException e)
  {
   e.printStackTrace();
  }
  
  org.w3c.dom.Document doc = null;
  org.w3c.dom.Document doc1 = null;
  
  try
  {
   doc = builder.parse(f);
   doc1 = builder.parse(f1);
  }
  catch (SAXException e1)
  {
   e1.printStackTrace();
  }
  catch (IOException e1)
  {
   e1.printStackTrace();
  }
  //a.add(vv.getIndex());
  //System.out.println(a.size());
  org.w3c.dom.Element root = doc.getDocumentElement();
  
  NodeList children  = (NodeList) root.getChildNodes();//children = [JobManage: null]
  
  for(int i=0;i<children.getLength();i++)
  {   
   if(children.item(i).getNodeType()==Node.ELEMENT_NODE)
   {
    String m = children.item(i).getNodeName();//得到节点名
    //System.out.println("m="+m);
    NodeList ids = root.getElementsByTagName(m);
    org.w3c.dom.Element ts = (org.w3c.dom.Element) ids.item(0);
    
    NodeList fast = ts.getElementsByTagName("id");
    org.w3c.dom.Element fast1 = (org.w3c.dom.Element) fast.item(0);
       Text fast2 = (Text)fast1.getFirstChild();
    String fast3 = fast2.substringData(0,10);
    //System.out.println("fast3="+fast3);
    org.w3c.dom.Element root1 = doc1.getDocumentElement();
    NodeList MMU = (NodeList)root1.getChildNodes();
                for(int j=0;j<MMU.getLength();j++)
                {
                 if(MMU.item(j).getNodeType()==Node.ELEMENT_NODE)
                 { 
                  String n = MMU.item(j).getNodeName();
                  NodeList nameElement1s =  root1.getElementsByTagName(n);
                  org.w3c.dom.Element nameElement1 = (org.w3c.dom.Element) nameElement1s.item(0);
                  String str2 = nameElement1.getNodeName();
                  
                  NodeList descriptions = nameElement1.getElementsByTagName("description");
                    
            org.w3c.dom.Element description = (org.w3c.dom.Element) descriptions.item(0);
            
            Text namedescription = (Text) description.getFirstChild();
            //System.out.println("222222222"+namedescription);
            NodeList values = nameElement1.getElementsByTagName("value");
            org.w3c.dom.Element value = (org.w3c.dom.Element) values.item(0);
            Text namevalue = (Text) value.getFirstChild();
            //System.out.println(namevalue);
            String namedescription1 = namedescription.toString();
            String namedescription2 = namedescription1.substring(namedescription1.indexOf(":",1)+2,namedescription1.indexOf("]"));
            //System.out.println("321"+namedescription2);
            String namevalue1 = namevalue.toString();
            String namevalue2 = namevalue1.substring(namevalue1.indexOf(":",1)+2,namevalue1.indexOf("]"));
            if(fast3.equals(str2))
            {  
 
             IndexVB qh = new IndexVB();
             qh.setIndex(m);
             qh.setDescription(namedescription2);
             qh.setValue(namevalue2);
                        
                         //System.out.println("vv"+vv.getIndex()+vv.getDescription()+vv.getValue());
             a.add(qh);
            }
           }
                }
   }
  }
  return a;
 }

 /*public static void main(String[] s) throws FileNotFoundException, IOException, JDOMException
 {
  InputItem bb = new InputItem();
  String indexFile = "C:\\index.xml";
  String itemFile = "C:\\Item.xml";
  ArrayList a;
  //bb.creatIndexList(indexFile,itemFile,vb,vv);
  
  a = bb.creatIndexList("C:\\index.xml","C:\\Item.xml");
  for(int i=0;i<a.size();i++)
  {
   System.out.println(((IndexVB)a.get(i)).getIndex());
  }
 }*/
}

 



Crespo 2006-07-28 09:26 发表评论
]]>用于显示下载或是显示图片的一段代码http://www.blogjava.net/silvernapoleon/archive/2006/07/26/60183.htmlCrespoCrespoWed, 26 Jul 2006 07:25:00 GMThttp://www.blogjava.net/silvernapoleon/archive/2006/07/26/60183.htmlhttp://www.blogjava.net/silvernapoleon/comments/60183.htmlhttp://www.blogjava.net/silvernapoleon/archive/2006/07/26/60183.html#Feedback0http://www.blogjava.net/silvernapoleon/comments/commentRss/60183.htmlhttp://www.blogjava.net/silvernapoleon/services/trackbacks/60183.htmlString id = request.getParameter("downLoadFileId");
  String fileName = request.getParameter("fileName");
  String path = "C:\\upload\\"+id+"\\"+fileName;(存放文件的路径)
  
  response.setHeader("Content-Disposition",  "attachment;filename="+fileName);
 


  response.setHeader("Connection",  "close"); 
  response.setHeader("Content-Type",  "application/octet-stream");
  try{
   OutputStream os = response.getOutputStream(); //不加此行将只能下载文本文件.下载jpg等就会出现打不开的现象.
   FileInputStream fis = new FileInputStream(path);
   byte[] b = new byte[1024];
   int i = 0;
 
   while ( (i = fis.read(b)) > 0 )
   {
    os.write(b, 0, i);
   }
   
   fis.close();
   os.flush();
   os.close();
   }
   catch ( Exception e )
   {
    System.out.println ( "IOException." + e );
   }



Crespo 2006-07-26 15:25 发表评论
]]>