textfile.java

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import java.io.*;
public class TextFile
{
  public static void type(String fileName)
  {
    int ch;
    try
    {
      FileReader fr = new FileReader(fileName);
      while((ch = fr.read())!=-1)
        System.out.print((char)ch);
      fr.close();
    }
    catch(IOException ex)
    {
      System.out.println("显示文件失败!");
    }
  }
  public static void list(String fileName)
  {
    String aLine;
    int lineNo = 1;
    System.out.println("\n文件内容如下:");
    try
    {
      FileReader fr = new FileReader(fileName);
      BufferedReader br = new BufferedReader(fr);
      while((aLine = br.readLine())!=null)
      {
        System.out.println(Integer.toString(lineNo)+"  "+aLine);
        lineNo++;
      }
      fr.close();
    }
    catch(IOException ex)
    {
      System.out.println("列出文件失败!");
    }
  }
  public static void copy(String source,String target)
  {
    int ch;
    try
    {
      FileReader fr = new FileReader(source);
      FileWriter fw = new FileWriter(target);
      while((ch = fr.read())!=-1)
        fw.write(ch);
      fr.close();
      fw.close();
    }
    catch(IOException ex)
    {
      System.out.println("复制文件失败!");
    }
  }
  public static void format(String source,String target)
  {
    String aLine;
    int lineNo = 1;
    try
    {
      FileReader fr = new FileReader(source);
      FileWriter fw = new FileWriter(target);
      BufferedReader br = new BufferedReader(fr);
      BufferedWriter bw = new BufferedWriter(fw);
      while((aLine = br.readLine())!=null)
      {
        bw.write(Integer.toString(lineNo)+"  "+aLine+"\n\r");
        lineNo++;
      }
      bw.flush();
      fr.close();
      fw.close();
    }
    catch(IOException ex)
    {
      System.out.println("格式化文件失败!");
    }
  }
}

class tester
{
  public static void main(String[] args)
  {
    //TextFile.type(args[0]);
    //TextFile.list(args[0]);
    TextFile.format(args[0],args[1]);
    TextFile.type(args[1]);
    
  }
}