PrintIO流

 1 import java.io.FileNotFoundException;
 2 import java.io.FileOutputStream;
 3 import java.io.PrintStream;
 4 /**
 5  * printIO流
 6  * @author 罗摩衔那
 7  *
 8  */
 9 public class TestPrintStream {
10     public static void main(String[] args) {
11         PrintStream ps=null;
12         try {//输出的目的文件
13             FileOutputStream fos = 
14                     new FileOutputStream("D:/罗摩衔那/DeskTop/write.txt");
15             ps=new PrintStream(fos);
16         } catch (FileNotFoundException e) {
17             e.printStackTrace();
18         }
19         if(ps !=null)
20         {
21             System.out.println(ps);
22         }
23         int in=0;
24         for(char c=0;c<=60000;c++)
25         {
26             System.out.println(c+" ");
27             if(in++>=100) {System.out.println();in=in-0;}
28         }
29     }
30 }

 1 import java.io.BufferedReader;
 2 import java.io.FileNotFoundException;
 3 import java.io.FileReader;
 4 import java.io.IOException;
 5 import java.io.PrintStream;
 6 /**
 7  * printIO流
 8  * @author 罗摩衔那
 9  *
10  */
11 public class TestPrintStream2 {
12     public static void main(String[] args) {
13         //传入命令行参数
14         String filename=args[0];
15         if(filename!=null) {list(filename,System.out);}
16     }
17 
18     public static void list(String filename, PrintStream out) {
19         try {
20             BufferedReader br=
21                     new BufferedReader(new FileReader(filename));
22             String s=null;
23             while((s=br.readLine())!=null) {
24                 out.println(s);
25             }
26             br.close();
27         } catch (IOException e) {
28             
29             out.println("无法读取文件");
30         }
31     }
32 }

 1 import java.io.BufferedReader;
 2 import java.io.FileWriter;
 3 import java.io.IOException;
 4 import java.io.InputStreamReader;
 5 import java.io.PrintWriter;
 6 import java.util.Date;
 7 /**
 8  * printIO流
 9  * @author 罗摩衔那
10  *
11  */
12 public class TestPrintStream3 {
13     public static void main(String[] args) {
14         String s=null;
15         //确定输入源为键盘录入
16         BufferedReader br=new BufferedReader(
17                 new InputStreamReader(System.in));
18         try {//输出目的文件
19             FileWriter fw=new FileWriter
20                     ("d:/罗摩衔那/DeskTop/PrintStream.txt",true);
21             PrintWriter log=new PrintWriter(fw);
22         while((s=br.readLine())!=null)//读取一行
23         {
24             if(s.equalsIgnoreCase("exit")) break;//退出循环条件
25             System.out.println(s.toUpperCase());//读取到的字母转换为大写
26             log.println("------------");
27             log.print(s.toUpperCase());//信息写入文件中
28             log.flush();//实时写入
29         }
30         log.println("==="+new Date()+"===");
31         log.flush();
32         log.close();
33             } 
34         catch (IOException e) {
35             
36             e.printStackTrace();
37         }
38     }
39 }