java写文件中并发和乱码问题解决

文件最后一行加文字

public static void writeOneLine(String append,String category,String fileName){
		FileChannel channel = null;
        FileLock lock = null;
		String path=FileOpearte.class.getResource("").toString();//文件相对路径的问题
        path=path.substring(6, path.length()-5)+"data"+"//"+category+"//"+fileName;
        File file=new File(path);
        try {


        if(!file.exists())
		{

		        file.createNewFile();

		}

	          RandomAccessFile rf=new RandomAccessFile(path,"rw");

	          channel = rf.getChannel();
	          //文件进程锁，当文件锁不可用时，当前进程会被挂起
	          //无参lock()默认为独占锁，不会报NonReadableChannelException异常，因为独占就是为了写
	          lock = channel.lock();


	          //将指针移动到文件末尾
	          rf.seek(rf.length());
	          //设置编码
	          append = new String(append.getBytes("utf-8"),"ISO8859_1");
	          rf.writeBytes(append+"\r\n"); //字符串末尾需要换行符
	          //释放锁
	          lock.release();
	          lock = null;
	          channel.close();
              channel = null;
	          rf.close();//关闭文件流
	         }catch (IOException e){
	             e.printStackTrace();
	         }finally {
	             if (lock != null) {
	                 try {
	                     lock.release();
	                     lock = null;
	                 } catch (IOException e) {
	                     e.printStackTrace();
	                 }
	             }

	             if (channel != null) {
	                 try {
	                     channel.close();
	                     channel = null;
	                 } catch (IOException e) {
	                     e.printStackTrace();
	                 }
	             }

	         }
	}