JAVA 向文本文件中换行插入字符

File txt_file=new File("c:\\file_id.txt");
RandomAccessFile rf = new RandomAccessFile(txt_file, "rw");
long fileLength = rf.length();
// 将本件指针移到文本末尾
rf.seek(fileLength);
// 文本文件追加文本，换行符
rf.writeBytes("字符内容\r\n");
rf.close();

File txt_file=new File("c:\\file_id.txt");
FileUtils.writeLines(txt_file, resource_sqlList);