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java io系列11之 FilterOutputStream详解

作者：互联网

FilterOutputStream 介绍

FilterOutputStream 的作用是用来“封装其它的输出流，并为它们提供额外的功能”。它主要包括BufferedOutputStream, DataOutputStream和PrintStream。

(01) BufferedOutputStream的作用就是为“输出流提供缓冲功能”。

(02) DataOutputStream 是用来装饰其它输出流，将DataOutputStream和DataInputStream输入流配合使用，“允许应用程序以与机器无关方式从底层输入流中读写基本 Java 数据类型”。

(03) PrintStream 是用来装饰其它输出流。它能为其他输出流添加了功能，使它们能够方便地打印各种数据值表示形式。

FilterOutputStream 源码(基于jdk1.7.40)

package java.io;

public class FilterOutputStream extends OutputStream {
    protected OutputStream out;

    public FilterOutputStream(OutputStream out) {
        this.out = out;
    }

    public void write(int b) throws IOException {
        out.write(b);
    }

    public void write(byte b[]) throws IOException {
        write(b, 0, b.length);
    }

    public void write(byte b[], int off, int len) throws IOException {
        if ((off | len | (b.length - (len + off)) | (off + len)) < 0)
            throw new IndexOutOfBoundsException();

        for (int i = 0 ; i < len ; i++) {
            write(b[off + i]);
        }
    }

    public void flush() throws IOException {
        out.flush();
    }

    public void close() throws IOException {
        try {
          flush();
        } catch (IOException ignored) {
        }
        out.close();
    }
}

 

 

转载：https://wangkuiwu.github.io/2012/05/11/FilterOutputStream/

 

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标签：11,java,void,write,IOException,io,FilterOutputStream,public,out
来源： https://www.cnblogs.com/cainiao-Shun666/p/16367772.html