IO流逐行读取文件内容

//IO流逐行读取文件内容

private static String readString(){

    //int len=0;

    StringBuffer str=new StringBuffer("");

    File file=new File(FILE_IN);

    try {

            FileInputStream is=new FileInputStream(file);

            InputStreamReader isr= new InputStreamReader(is);

            BufferedReader in= new BufferedReader(isr);

            String line=null;

            while( (line=in.readLine())!=null ){

            //处理换行符的问题,部分文件不需要处理换行符问题

            //if(len != 0){

            //str.append("\r\n"+line);

            //}else{

                    str.append(line);

            //}

            //len++;

        }

        in.close();

        is.close();

    } catch (IOException e) {

            e.printStackTrace();

    }

    return str.toString();

}