/*
* 以前的操作:
* a.txt -- b.txt
* c.txt -- d.txt
*
* 现在想要:
* a.txt+b.txt -- c.txt
*/
public class SequenceInputStreamDemo {
public static void main(String[] args) throws IOException {
// SequenceInputStream(InputStream s1, InputStream s2)
// 需求:把ByteArrayStreamDemo.java和DataStreamDemo.java的内容复制到Copy.java中
InputStream s1 = new FileInputStream("ByteArrayStreamDemo.java");
InputStream s2 = new FileInputStream("DataStreamDemo.java");
SequenceInputStream sis = new SequenceInputStream(s1, s2);
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream("Copy.java"));
// 如何写读写呢,其实很简单,你就按照以前怎么读写,现在还是怎么读写
byte[] bys = new byte[1024];
int len = 0;
while ((len = sis.read(bys)) != -1) {
bos.write(bys, 0, len);
}
bos.close();
sis.close();
}
}
/*
* 以前的操作:
* a.txt -- b.txt
* c.txt -- d.txt
* e.txt -- f.txt
*
* 现在想要:
* a.txt+b.txt+c.txt -- d.txt
*/
public class SequenceInputStreamDemo2 {
public static void main(String[] args) throws IOException {
// 需求:把下面的三个文件的内容复制到Copy.java中
// ByteArrayStreamDemo.java,CopyFileDemo.java,DataStreamDemo.java
// SequenceInputStream(Enumeration e)
// 通过简单的回顾我们知道了Enumeration是Vector中的一个方法的返回值类型。
// Enumeration elements()
Vector<inputstream> v = new Vector<inputstream>();/<inputstream>/<inputstream>
InputStream s1 = new FileInputStream("ByteArrayStreamDemo.java");
InputStream s2 = new FileInputStream("CopyFileDemo.java");
InputStream s3 = new FileInputStream("DataStreamDemo.java");
v.add(s1);
v.add(s2);
v.add(s3);
Enumeration<inputstream> en = v.elements();/<inputstream>
SequenceInputStream sis = new SequenceInputStream(en);
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream("Copy.java"));
// 如何写读写呢,其实很简单,你就按照以前怎么读写,现在还是怎么读写
byte[] bys = new byte[1024];
int len = 0;
while ((len = sis.read(bys)) != -1) {
bos.write(bys, 0, len);
}
bos.close();
sis.close();
}
}