java io学习(九) FilterInputStream2014-08-12FilterInputStream 介绍FilterInputStream 的作用是用来“封装其它的输入流,并为它们提供额外的功能”。它的常用的子类有BufferedInputStream和DataInputStream。BufferedInputStream的作用就是为“输入流提供缓冲功能,以及mark()和reset()功能”。DataInputStream 是用来装饰其它输入流,它“允许应用程序以与机器无关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(基于jdk1.7.40)
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();}}来源:http://www.cnblogs.com/skywang12345/p/io_10.html