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Java操作文本文件的方法(2)

时间:2009-12-23 15:42来源:未知 作者:admin 点击:
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FileWriter fw = new FileWriter("hello.txt"); String s = "hello world"; fw.write(s,0,s.length()); fw.flush(); OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("hello2.txt")); osw.wr

  FileWriter fw = new FileWriter("hello.txt");
  String s = "hello world";
  fw.write(s,0,s.length());
  fw.flush();

  OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("hello2.txt"));
  osw.write(s,0,s.length());
  osw.flush();

  PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream("hello3.txt")),true);
  pw.println(s);

  不要忘记用完后关闭流!下面是个小例子,帮助新手理解。其实有的时候java的IO系统是需要我们多记记的,不然哪天就生疏了。

  hello world i like java language

  import java.io.*;

  public class TestFile2
  {
  public static void main(String[] args) throws IOException
  {
  FileReader fr = new FileReader("ming.txt");
  char[] buffer = new char[1024];
  int ch = 0;
  while((ch = fr.read())!=-1 )
  {
   System.out.print((char)ch);
  }

  InputStreamReader isr = new InputStreamReader(new FileInputStream("ming.txt"));
  while((ch = isr.read())!=-1)
  {
   System.out.print((char)ch);
  }

  BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("ming.txt")));
  String data = null;
  while((data = br.readLine())!=null)
  {
   System.out.println(data);
  }

  FileWriter fw = new FileWriter("hello.txt");
  String s = "hello world";
  fw.write(s,0,s.length());
  fw.flush();

  OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("hello2.txt"));
  osw.write(s,0,s.length());
  osw.flush();

  PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream("hello3.txt")),true);
  pw.println(s);

  fr.close();
  isr.close();
  br.close();
  fw.close();
  osw.close();
  pw.close();
  }
  }

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