学习到java的io流中关于序列流SequenceInputStream使用，其中把3个以上的流串联起来操作，
使用的参数是生成运行时类型为 InputStream 对象的 Enumeration 型参数，本人对Enumeration集合
了解较少，便记录一下：
方法一：
通过Vector集合来获得：
InputStream is1 = new FileInputStream("d:\\1.txt");
InputStream is2 = new FileInputStream("d:\\2.txt");
InputStream is3 = new FileInputStream("d:\\3.txt");
OutputStream os = new FileOutputStream("d:\\4.txt");
//使用Vector集合获取Enumeration
Vector<InputStream> v = new Vector<InputStream>();
v.add(is1);
v.add(is2);
v.add(is3);
Enumeration<InputStream> elem = v.elements();
SequenceInputStream sis = new SequenceInputStream(elem);
byte[] buf = new byte[1024];
int len = 0;
while((len = sis.read(buf)) != -1)
{
os.write(buf, 0, len);
}
如果要想操作里面的元素，可以使用它的两个方法
1 //使用Vector集合获取Enumeration
Vector<InputStream> v = new Vector<InputStream>();
v.add(is1);
v.add(is2);
v.add(is3); Enumeration<InputStream> elem = v.elements();
while(elem.hasMoreElements())
{
System.out.println(elem.nextElement());
}
方法二：
利用List集合+Iterator+匿名内部类方法实现
InputStream is1 = new FileInputStream("d:\\1.txt");
InputStream is2 = new FileInputStream("d:\\2.txt");
InputStream is3 = new FileInputStream("d:\\3.txt");
OutputStream os = new FileOutputStream("d:\\4.txt");
LinkedHashSet<InputStream> set = new LinkedHashSet<InputStream>();
set.add(is1);
set.add(is2);
set.add(is3);
final Iterator<InputStream> it = set.iterator();
Enumeration<InputStream> en = new Enumeration<InputStream>()
{
@Override
public boolean hasMoreElements()
{
// TODO Auto-generated method stub
return it.hasNext();
}
@Override
public InputStream nextElement()
{
// TODO Auto-generated method stub
return it.next();
}
};
SequenceInputStream sis = new SequenceInputStream(en);
byte[] buf = new byte[1024];
int len = 0;
while((len = sis.read(buf)) != -1)
{
os.write(buf, 0, len);
}
如果要想操作里面的元素，也可以使用它的两个方法
Enumeration<InputStream> en = new Enumeration<InputStream>()
{ @Override
public boolean hasMoreElements()
{
// TODO Auto-generated method stub
return it.hasNext();
} @Override
public InputStream nextElement()
{
// TODO Auto-generated method stub
return it.next();
}
}; while(en.hasMoreElements())
{
System.out.println(en.nextElement());
}