语源科技BlogJava-大道致远

Hashtable 的遍历

wyg405 — Wed, 31 Jan 2007 07:10:00 GMT

如果不知道Hashtable中的KEY，可以用下面的方同取得KEY！
public static void printall(Hashtable ht){
    Enumeration en = ht.keys();
    while(en.hasMoreElements()){
      Object key_num = en.nextElement();
      System.out.print("DEBUG: " + key_num);
      System.out.print(" = ");
      System.out.println(ht.get(key_num));
    }
}

wyg405 2007-01-31 15:10 发表评论

java NIO 传对象

wyg405 — Wed, 31 Jan 2007 07:08:00 GMT

//Client 端：
  Student pgt=new Student();
  pgt.setName("name");
  pgt.setAge("age");
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  ObjectOutputStream oos = new ObjectOutputStream(baos);
  oos.writeObject(pgt);
  oos.close();
  byte[] bs = baos.toByteArray();
  ByteBuffer buffer = ByteBuffer.wrap(bs, 0, bs.length);

    while (buffer.hasRemaining() & client.write(buffer) != -1)
    {
       waitFor(1000);
    }
    buffer.flip();

//Server 端：
       int reads = sc_key.read(byteBuffer);
       byteBuffer.flip();
       byte[] tmp_buffer = byteBuffer.array();
       ByteArrayInputStream byteIn = new ByteArrayInputStream(tmp_buffer);
       ObjectInputStream objIn = new ObjectInputStream(byteIn);
       pgt = (Student) objIn.readObject();
       objIn.close();

wyg405 2007-01-31 15:08 发表评论

ByteBuffer 转化为 String

wyg405 — Wed, 31 Jan 2007 07:02:00 GMT

1 public String decode(ByteBuffer buffer)
2 {
3         System.out.println( " buffer= " + buffer);
4         Charset charset = null ;
5         CharsetDecoder decoder = null ;
6         CharBuffer charBuffer = null ;
7          try
8      {
9             charset = Charset.forName( " gb2312 " );
10             decoder = charset.newDecoder();
11             charBuffer = decoder.decode(buffer);
12             System.out.println( " charBuffer= " + charBuffer);
13             System.out.println(charBuffer.toString());
14              return charBuffer.toString();
15         }
16          catch (Exception ex)
17      {
18             ex.printStackTrace();
19              return "" ;
20         }
21 }

wyg405 2007-01-31 15:02 发表评论

DOM4J解析XML

wyg405 — Sun, 12 Nov 2006 08:24:00 GMT

Document doc = null ;
doc = DocumentHelper.createDocument();
// 添加根结点。
Element root = doc.addElement( " root " );
// 为根结点添加子结点。
Element child = root.addElement( " child " );
// 为节点添加属性
child.addAttribute( " childattribute " , " attribute " );
// 为节点添加Text
child.setText( " Text " );

// 遍历所有结点的方法

Element element = doc.getRootElement();

public void xmlIterator(Element element)
{
        for ( int i = 0 , size = element.nodeCount(); i < size; i ++ )
         {
           Node node = element.node(i);
            if (node instanceof Element)
             {
                xmlIterator((Element) node);
             }
          }
  }

// 如果想不遍历而得到某一节点，那么就要为每一个节点添加一个ID属性
// 例如：Element.addAttribute("ID",id);
// 然后用以下方法即可。
Element findElement = doc.elementByID(id);

wyg405 2006-11-12 16:24 发表评论