打印流，切割，合并

package yuwei.com;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.SequenceInputStream;
import java.util.Enumeration;
import java.util.Vector;

/*
 * PrintStream字节打印流
 * 构造函数可以接收的参数
 * 1、file对象
 * 2、String
 * 3、字符输出流
 * 
 * PrintWriter字符打印流
 * 1、file对象
 * 2、String
 * 3、字符输出流
 * 4、字节输出流
 * 
 * */
public class PrintStreamDemo {

    //键盘输入到控制台
    public static void BufferedReaderDemo() throws IOException {
        //读取键盘
        BufferedReader bufr = 
                new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(System.out);
        String line = null;
        //读取键盘一行数据
        while((line = bufr.readLine())!=null){
            //写入控制台
            out.write(line.toUpperCase());
            out.println();
            out.flush();
        }
        out.close();
        bufr.close();
    }
    //键盘输入到文件
    public static void readerToFile() throws IOException {
        BufferedReader bufr = 
                new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(new FileWriter("键盘输入到文件.txt"));
        String line = null;
        while((line = bufr.readLine())!=null){
            //写入控制台
            out.write(line.toUpperCase());
            out.println();
            out.flush();
        }
        out.close();
        bufr.close();
    }
    //合并流
    public static void join() throws IOException {

        Vector<FileInputStream> v = new Vector<FileInputStream>();
        v.add(new FileInputStream("D:\\java学习\\IoStudy\\spit\\2.jpg"));
        v.add(new FileInputStream("D:\\java学习\\IoStudy\\spit\\1.jpg"));
        v.add(new FileInputStream("D:\\java学习\\IoStudy\\spit\\3.jpg"));

        //返回此向量的组件的枚举。返回的 Enumeration 对象将生成此向量中的所有项。生成的
        //第一项为索引 0 处的项，然后是索引 1 处的项，依此类推。 
        Enumeration<FileInputStream> en = v.elements();
        SequenceInputStream sis = new SequenceInputStream(en);
        //
        FileOutputStream fos = new FileOutputStream("D:\\java学习\\IoStudy\\spit\\合并.jpg");
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        byte[] buf = new byte[1024*1024];
        int len = 0;
        while((len = sis.read(buf))!=-1) {
            bos.write(buf,0,len);
        }
        bos.close();
        sis.close();
    } 
    //切割
    public static void spilt() throws IOException {
        FileInputStream fi = new FileInputStream("完成复制的图片.jpg");
        BufferedInputStream bis = new BufferedInputStream(fi);
        FileOutputStream fos = null;
        byte[] buf = new byte[1024*1024];
        int len = 0;
        int count = 0;
        while((len = bis.read(buf))!=-1) {
            fos = new FileOutputStream("D:\\java学习\\IoStudy\\spit\\" + (count++) +".txt");
            fos.write(buf,0,len);
        }
        bis.close();
    }
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub

        //BufferedReaderDemo();
        //readerToFile();
        //join();
        //spilt();
    }

}