FileterInputStream 介绍
FilterInputStream的作用是用来封装其他的输入流的,并为他们提供额外的功能,它的常用子类有BufferesInputStream和DataInputStream
BufferInputStream的作用就是在为"输入流提供缓存功能,以及mark()和reset()功能"
DataInputStream 是用来装饰其他输入流,它允许"应用程序以与及其无关的方式从底层输入流中读取基本java数据类型"。应用程序可以使用DataOutputStream(数据输出流)写入由DataInputStream(数据输入流)读取的数据
FilterInputStream源码
package java.io;
public class FilterInputStream extends InputStream {
protected volatile InputStream in;
protected FilterInputStream(InputStream in) {
this.in = in;
}
public int read() throws IOException {
return in.read();
}
public int read(byte b[]) throws IOException {
return read(b, 0, b.length);
}
public int read(byte b[], int off, int len) throws IOException {
return in.read(b, off, len);
}
public long skip(long n) throws IOException {
return in.skip(n);
}
public int available() throws IOException {
return in.available();
}
public void close() throws IOException {
in.close();
}
public synchronized void mark(int readlimit) {
in.mark(readlimit);
}
public synchronized void reset() throws IOException {
in.reset();
}
public boolean markSupported() {
return in.markSupported();
}
}