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print流

2024-11-17 21:34:39   202人阅读

　　PrintWriter和PrintStream都属于输出流，分别针对字符和字节。

　　PrintWriter和PrintStream提供了重载的print,println方法用于多种类型的输出

　　PrintWriter和PrintStream的输出操作不会抛出异常，用户通过检测错误状态获取错误信息。

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 1 import java.io.File; 2 import java.io.FileNotFoundException; 3 import java.io.FileOutputStream; 4 import java.io.PrintStream; 5  6  7 public class TestPrintStream1 { 8  9     /**10      * @param args11      */12     public static void main(String[] args) {13         // TODO Auto-generated method stub14         PrintStream ps=null;15         try {16             FileOutputStream fos=new FileOutputStream("d:"+File.separator+"test.txt");17             ps=new PrintStream(fos);18         } catch (FileNotFoundException e) {19             e.printStackTrace();20         }21         if(ps!=null){22             System.setOut(ps);23         }24         25         int l=0;26         for(char c=0;c<=60000;c++){27             System.out.println(c);28         }29     }30 31 }

 

 1 import java.io.*; 2 public class TestPrintStream2 { 3   public static void main(String[] args) { 4     String filename = args[0]; 5     if(filename!=null){list(filename,System.out);} 6   } 7   public static void list(String f,PrintStream fs){ 8     try { 9       BufferedReader br = 10                   new BufferedReader(new FileReader(f));11       String s = null; 12       while((s=br.readLine())!=null){13         fs.println(s);            14       }15       br.close();16     } catch (IOException e) {17       fs.println("无法读取文件");18     }19   }20 }

 

 1 import java.util.*;  2 import java.io.*; 3 public class TestPrintStream3 { 4   public static void main(String[] args) { 5     String s = null; 6     BufferedReader br = new BufferedReader( 7                         new InputStreamReader(System.in)); 8     try { 9       FileWriter fw = new FileWriter10                            ("d:\\bak\\logfile.log", true); 11       PrintWriter log = new PrintWriter(fw);12       while ((s = br.readLine())!=null) {13         if(s.equalsIgnoreCase("exit")) break;14         System.out.println(s.toUpperCase());15         log.println("-----");16         log.println(s.toUpperCase()); 17         log.flush();18       }19       log.println("==="+new Date()+"==="); 20       log.flush();21       log.close();22     } catch (IOException e) {23       e.printStackTrace();24     }25   }26 }

 

print流


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