package fileIo;   
 
import  java.io.BufferedReader;   
import  java.io.BufferedWriter;   
import  java.io.File;   
import  java.io.FileReader;   
import  java.io.FileWriter;   
 
public  class  ReadTextFile {   
    public  BufferedReader bufread;   
    public  BufferedWriter bufwriter;   
    File writefile;   
    String filepath, filecontent, read;   
    String readStr  =   "" ;   
    // 从文本文件中读取内容    
     public  String readfile(String path)      
      {   
         try    {   
           filepath  =  path;  // 得到文本文件的路径    
            File file  =   new  File(filepath);   
           FileReader fileread  =   new  FileReader(file);   
           bufread  =   new  BufferedReader(fileread);   
             while  ((read  =  bufread.readLine())  !=   null )   {   
               read  =  read + " /r/n " ;               
               readStr  =  readStr  +  read;   
           }    
        }   catch  (Exception d)   {   
           System.out.println(d.getMessage());   
       }    
        return  readStr;  // 返回从文本文件中读取内容    
    }    
    
    // 向文本文件中写入内容    
      public   void  writefile(String path, String content,  boolean  append)   {   
         try    {   
            boolean  addStr  =  append;  // 通过这个对象来判断是否向文本文件中追加内容    
            filepath  =  path;  // 得到文本文件的路径    
            filecontent  =  content;  // 需要写入的内容    
            writefile  =   new  File(filepath);   
            if  (writefile.exists()  ==   false )  // 如果文本文件不存在则创建它     
               {   
               writefile.createNewFile();   
               writefile  =   new  File(filepath);  // 重新实例化    
            }    
           FileWriter filewriter  =   new  FileWriter(writefile, addStr);   
            // 删除原有文件的内容    
            java.io.RandomAccessFile file =   new  java.io.RandomAccessFile(path, " rw " );   
           file.setLength( 0 );   
            // 写入新的文件内容    
            filewriter.write(filecontent);   
           filewriter.close();   
           filewriter.flush();   
        }   catch  (Exception d)   {   
           System.out.println(d.getMessage());   
       }    
    }    
    
     public   static   void  main(String[] args)  throws  Exception   {   
       ReadTextFile parse  =   new  ReadTextFile();   
       String filecontent  =  parse.readfile( " c:/applicationContext.xml " );           
       parse.writefile( " c:/applicationContext.xml " ,filecontent, true );   
          
    }    
}