Java简单文件读写, 昨天帮同学写了一个简单的文件处理程序，记录这边吧，竟然花了一个小时，就是因为system.out打印日志的时候位置写错了 :-(

 public static void main(String[] args){
  try{
   BufferedReader br = new BufferedReader(new FileReader("D:/a.txt"));
   File dest = new File("D:/b.txt");
   BufferedWriter writer  = new BufferedWriter(new FileWriter(dest));
   
   String data = http://www.mamicode.com/null;
   String sampletxt = "++++";
   StringBuffer strbf = null;
   int count = 0; // 行数标记
   boolean flag = false; // 本对++++出现的切换拼接开关
   boolean output = false; // 输出本对 ++++内的内容
   while((data = http://www.mamicode.com/br.readLine()) != null){
    count ++;
    output = false;
    if(data.contains(sampletxt) && count > 2){
     if(!flag){
      // 除了第一行之外，第一次出现++++即开始append，直到第二个++++
      strbf = new StringBuffer();
      flag = true;
     }else{
      flag = false;
      if(strbf != null){
       output = true;
       strbf.append(data);
      }
     }
    }
    if(flag){
     strbf.append(data);
    }else{
     if(!output){
      writer.write(data+"\n");
      System.out.println("----"+data);
     }
    }
    if(output && (strbf != null) && (strbf.length() > 0)){
     writer.write(strbf.toString());
     System.out.println("----"+strbf.toString());
    }
   }
   writer.flush();
   br.close();
   writer.close();
  }catch(Exception ex){
   ex.printStackTrace();
  }
 }

另外一个方法：

 public List<UVO> readfileInfo(String fileName) throws FileNotFoundException,IOException{
  List <UVO> list= new ArrayList<UVO>();
     try{
   uniportal_logger.trace("readfileInfo with fileName :"+ fileName);
      File readfile = new File(fileName);
      if(readfile.exists()){
       // 文件重命名
       readfile.renameTo(new File(fileName+fileRenameSuffix));
      }
      readfile = new File(fileName+fileRenameSuffix);
      
      int sampletype = 1; // 为syncsample_spam.txt时填1，为syncsample_normal.txt时填2
      if((fileName+fileRenameSuffix).toLowerCase().endsWith(filename_spam)){
       sampletype = 1;
      }else if((fileName+fileRenameSuffix).toLowerCase().endsWith(filename_normal)){
       sampletype = 2;
      }
      
      if(readfile != null && readfile.exists() && !readfile.isDirectory()){
    //指定读取文件时以UTF-8的格式读取    
    FileInputStream in = new FileInputStream(readfile);
    BufferedReader br = new BufferedReader(new InputStreamReader(in,"UTF-8"));
    String line = null;
       while((line=br.readLine())!=null){
                 line = line.trim();
                 String ckresult = checkline(line);
        if(ckresult.equals("")){
         UVO entity = new UVO();       
         entity.setSampletype(sampletype);
         entity.setSmcontent(line.trim().replaceAll(",", "，"));
         list.add(entity);
        }
       }

       br.close();
       in.close();
   }
     }catch(Exception ex){
   ex.printStackTrace();
     }
     return list;
    }

Java简单文件读写