java 读取文件转换为字符串

  public String selfReadFile(String strFileName){
    //Read   the   file   into   a   string   buffer,   then   return   as   a   string.
    ServletContext application ;
    HttpServletRequest request = null;
    HttpSession session=null;
    
    String className = this.getClass().getName();
    String packageName = this.getClass().getPackage().getName();
    String classFileName = className.substring(packageName.length()+1)+".class";
    String classFilePath = this.getClass().getResource(classFileName).toString();
    String filePath = classFilePath.substring(0,classFilePath.length()-className.length()-14);
    
        StringBuffer   buf=null;//the   intermediary,   mutable   buffer   
        BufferedReader   breader = null;//reader   for   the   template   files   
        try     
        {   
          breader = new BufferedReader(new InputStreamReader(new FileInputStream((strFileName)),Charset.forName("utf-8")));
            //breader = new BufferedReader(new   FileReader(strFileName));//header  
          //java.net.URL url =session.getServletContext().getResource("/rates.txt"); 
          //breader =new BufferedReader(new InputStreamReader(url.openStream())); 
        	
              buf   =   new   StringBuffer();   
              while(breader.ready())     
                    buf.append((char)breader.read());   
              breader.close();   
        }//try   
        catch(Exception   e)     
        {   
        	e.printStackTrace();
        }//catch   
        return   buf.toString();   
	}