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 );                 }    }