PrintIO流

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
/**
 * printIO流
 * @author 罗摩衔那
 *
 */
public class TestPrintStream {
    public static void main(String[] args) {
        PrintStream ps=null;
        try {//输出的目的文件
            FileOutputStream fos = 
                    new FileOutputStream("D:/罗摩衔那/DeskTop/write.txt");
            ps=new PrintStream(fos);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        if(ps !=null)
        {
            System.out.println(ps);
        }
        int in=0;
        for(char c=0;c<=60000;c++)
        {
            System.out.println(c+" ");
            if(in++>=100) {System.out.println();in=in-0;}
        }
    }
}

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
/**
 * printIO流
 * @author 罗摩衔那
 *
 */
public class TestPrintStream2 {
    public static void main(String[] args) {
        //传入命令行参数
        String filename=args[0];
        if(filename!=null) {list(filename,System.out);}
    }

    public static void list(String filename, PrintStream out) {
        try {
            BufferedReader br=
                    new BufferedReader(new FileReader(filename));
            String s=null;
            while((s=br.readLine())!=null) {
                out.println(s);
            }
            br.close();
        } catch (IOException e) {
            
            out.println("无法读取文件");
        }
    }
}

import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Date;
/**
 * printIO流
 * @author 罗摩衔那
 *
 */
public class TestPrintStream3 {
    public static void main(String[] args) {
        String s=null;
        //确定输入源为键盘录入
        BufferedReader br=new BufferedReader(
                new InputStreamReader(System.in));
        try {//输出目的文件
            FileWriter fw=new FileWriter
                    ("d:/罗摩衔那/DeskTop/PrintStream.txt",true);
            PrintWriter log=new PrintWriter(fw);
        while((s=br.readLine())!=null)//读取一行
        {
            if(s.equalsIgnoreCase("exit")) break;//退出循环条件
            System.out.println(s.toUpperCase());//读取到的字母转换为大写
            log.println("------------");
            log.print(s.toUpperCase());//信息写入文件中
            log.flush();//实时写入
        }
        log.println("==="+new Date()+"===");
        log.flush();
        log.close();
            } 
        catch (IOException e) {
            
            e.printStackTrace();
        }
    }
}