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java.util.ArrayList

Crespo — Sat, 16 Sep 2006 02:28:00 GMT

   数组和数�l�列表之间有着重大的区别。数�l�是Java语言的一个特征，对于每个元素�c�d��T�Q�都有数�l�类型T[];然而，ArrayList�c�L��个定义java.util包中的类库。这是一个存放object�c�d��元素�?普通�?的类型。要注意的是�Q�要从数�l�列表中提取元素�Ӟ��需要进行类型�{换�?br /> 使用add�Ҏ��可以向数�l�列表中��d��新元素：
   ArrayList staff = new ArrayList();
   staff.add(new Employee(....));
   staff.add(new Employee(....));
   ArrayList�cȝ��理了一个Object引用的内部数�l�。最�l�，可能会用完数�l�的�I�间。如果调用了add�Q�而内部数�l�已�l�满了，数组列表��自动创��Z��一个更大的数组�Q��ƈ自动把小数组中的对象拯��到大数组�?br /> Size�Ҏ��q�回数组列表的实际元素个�?br />    staff.size()    它等价于数组a的a.length
   讉K��数组列表元素
因�ؓ ArrayList�c�M��是Java语言的一部分�Q�它只是个提供在标准库中、由某�h�~�写的工��L��Q��ƈ不像在访问数�l�元素时可以使用[]语法�?/p>

��P��要存取或改变数组元素�Q�你必须使用get和set�Ҏ��
   要设�|�第i个元素，需要��用：
   staff.set(i,harry);
得到数组列表元素要更复杂一些，因�ؓget�Ҏ��q�回的类型是Object�Q�你�q�需要把它�{换�ؓ惌��的类�?br />   Employee e = (Employee)staff.get(i); 它等价于Employee e = a[i];

   最后�ȝ��一下：
无需指定数组大小
用add增添��L��多的元素;
用size()代替length计算元素的个�?
�?Employee)a.get(i)代替a[i]讉K��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();//��得到的“文件名“进行封�?br />                            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;
    }

��d��arraylist里的�?

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

Crespo — Sun, 20 Aug 2006 03:35:00 GMT

/*
* Created on 2006-8-16
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>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>Preferences>Java>Code Generation>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 " );
             // �q�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�Q�事务被取消�Q��?/span> " );
        }

    }

}

Crespo 2006-08-20 11:35 发表评论

Crespo — Mon, 31 Jul 2006 04:12:00 GMT

��流存进Buffer�?br />byte[] 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 ��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

�l�合w3c.dom和jdom 用Java语言实现对Xml的创建，插入、修攏V��查询的实例

Crespo — Fri, 28 Jul 2006 01:26:00 GMT

在这里包��׃��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  {
   if(children.item(i).getNodeType()==Node.ELEMENT_NODE)
   {
    String m = children.item(i).getNodeName();//得到节点�?br />    //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                {
                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  {
   System.out.println(((IndexVB)a.get(i)).getIndex());
  }
}*/
}

Crespo 2006-07-28 09:26 发表评论

Crespo — Wed, 26 Jul 2006 07:25:00 GMT

String id = request.getParameter("downLoadFileId");
  String fileName = request.getParameter("fileName");
  String path = "C:\\upload\\"+id+"\\"+fileName;(存放文�g的�\�?

  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��只能下载文本文�?下蝲jpg�{�就会出现打不开的现�?
   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