try {
SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");
System.err.println(sdf2.format(new Date()));
// File f = new File("C:\\errorJmsMessage"+sdf2.format(new
// Date())+".txt");
// 创建文件夹
File tf = new File("C:\\临时文件");
if (!tf.exists()) {
tf.mkdir();
}
File f = new File("C:\\临时文件\\errorJmsMessage"
+ sdf2.format(new Date()) + ".txt");
if (!f.exists()) {
f.createNewFile();
System.err.println(f + "已创建！");
}
String str;
byte[] s;
RandomAccessFile rf = new RandomAccessFile(f, "rw");
long count = rf.length();
rf.seek(count);
// 如要换行，用 \r\n 次序不要乱
for (int i = 0; i < 4; i++) {
str = "这是第 " + i + "行文本示例\r\n";
s = str.getBytes();
rf.write(s);
}
rf.close();
} catch (Exception e) {
e.printStackTrace();
System.err.println("读写出错");
}
