java中使用Files.readLines()处理文本中行数据方式

public void lineProcess(File file) throws ioException {
    Files.readLines(file, Charset.defaultCharset(), new LineProcessor() {
        File outFile = new File("outfile");//处理后的数据输出文件
        List<String> lines = new ArrayList<String>();
        @Override
        public boolean processLine(String line) throws IOException {
            String newLine = "";
            //file中的 line数据格式：name,age,address -> NAME,AGE,ADDRESS,
            String[] contents = line.split(",");
            for (int i=0;i<contents.length;i++){
                newLine.concat(contents[i].toLowerCase());
            }
            lines.add(newLine);
            //将处理后的数写入新的文件 outFile
            FileUtils.writeLines(outFile,lines,true);
            lines.clear();
            return true;
        }
        @Override
        public Object getResult() {
            try{
                FileUtils.writeLines(outFile,lines,true);
            }catch (Exception e){
                e.getCause();
            }
            lines.clear();
            return null;
        }
    });
}

<dependency>
    <groupId>com.Google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>19.0</version>
</dependency>

BufferedWriter output = new BufferedWriter(new OutputStreamWriter(conn.openOutputStream())); 
int i = 1;
String message = "message " + i;
while(isRunning) {
    output.write(message+"/n"); 
    i++;
}

BufferedReader input = new BufferedReader(new  InputStreamReader(m_conn.openInputStream()));
String message = "";
String line = null;
while((line = m_input.readLine()) != null) {
    message += line;
}
System.out.println(message);

String readLine(boolean ignoreLF) throws IOException {
 StringBuffer s = null;
 int startChar;
        synchronized (lock) {
            ensureOpen();
     boolean omitLF = ignoreLF || skipLF;
     bufferLoop:
     for (;;) {
  if (nextChar >= nChars)
      fill(); //在此读数据
  if (nextChar >= nChars) { 
      if (s != null && s.length() > 0)
   return s.toString();
      else
   return null;
  }
      ......//其它
}
private void fill() throws IOException {
 ..../其它
 int n;
 do {
     n = in.read(cb, dst, cb.length - dst); //实质
 } while (n == 0);
 if (n > 0) {
     nChars = dst + n;
     nextChar = dst;
 }
    }