从http://exampledepot.8waytrips.com/egs/java.io/RenameFile.html复制
// File (or directory) with old name
File file = new File("oldname");
// File (or directory) with new name
File file2 = new File("newname");
if (file2.exists())
throw new java.io.IOException("file exists");
// Rename file (or directory)
boolean success = file.renameTo(file2);
if (!success) {
// File was not successfully renamed
}
追加到新文件：
java.io.FileWriter out= new java.io.FileWriter(file2, true /*append=yes*/);
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