JDK1.7 引入了新的IO操作類。在java.nio.file包下,包括Files、Paths等工具類。
中文文檔:http://www.matools.com/file/manual/jdk_api_1.8_google/java/nio/file/package-summary.html
1.創建文件或目錄
/**
* 創建文件或目錄
*/
private static void createFileOrDir() {
try {
// 創建新目錄,除了最後一個部件,其他必須是存在的
Files.createDirectory(Paths.get("F:/test"));
// 創建路徑中的中間目錄,能創建不存在的中間部件
Files.createDirectories(Paths.get("F:/test/test"));
// 創建文件及相關目錄
Path path = Paths.get("F:/test/testbak.txt");
Files.createDirectories(path.getParent());
Files.createFile(path);
} catch (IOException e) {
e.printStackTrace();
}
}
2.刪除文件
/**
* 刪除文件
*/
private static void deleteFile() {
Path p = Paths.get("F:/test.txt");
try {
Files.delete(p);// 用static boolean deleteIfExists(Path path)方法比較好
System.out.println("刪除成功");
} catch (IOException e) {
e.printStackTrace();
}
}
3.移動文件
/**
* 移動文件
*/
private static void moveFile() {
Path pSrc = Paths.get("F:/test.txt");
Path pDest = Paths.get("E:/test.txt");
try {
Files.move(pSrc, pDest, StandardCopyOption.REPLACE_EXISTING);
System.out.println("移動成功");
} catch (IOException e) {
e.printStackTrace();
}
}
4.複製文件
/**
* 複製文件
*/
private static void copyFile() {
Path pSrc = Paths.get("F:/test.txt");
Path pDest = Paths.get("F:/testbak.txt");
try {
Files.copy(pSrc, pDest, StandardCopyOption.REPLACE_EXISTING);
System.out.println("複製成功");
} catch (IOException e) {
e.printStackTrace();
}
}
5.從文件讀取數據
/**
* 從文件讀取數據
*/
private static void readFromFile() {
Path p = Paths.get("F:/", "test.txt");
try {
byte[] bytes = Files.readAllBytes(p);
System.out.println(new String(bytes));
} catch (IOException e) {
e.printStackTrace();
}
}
6.從文件按行讀取數據
/**
* 從文件按行讀取數據
*/
private static void readByLineFromFile() {
Path path = Paths.get("F:/", "test.txt");
try {
// 方式1
List<String> lines = Files.lines(path).collect(Collectors.toList());
System.out.println(lines);
// 方式2
BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8);
String str = null;
while((str = reader.readLine()) != null){
System.out.println(str);
}
} catch (IOException e) {
e.printStackTrace();
}
}
如果方式2指定的字符編碼不對,可能會拋出異常 MalformedInputException ,或者讀取到了亂碼:
7.向文件寫入數據
/**
* 向文件寫入數據
*/
private static void write2File() {
// 獲得路徑
Path path = Paths.get("F:/", "test.txt");
String info = "I love java really,你喜歡什麼?";
try {
// 方式1
Files.write(path, info.getBytes("utf8"), StandardOpenOption.APPEND);
// 方式2
BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
writer.write(info );
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
8.獲得文件路徑的幾種方法
/**
* 獲得文件路徑的幾種方法
*/
private static void getFilePath() {
File file = new File("F:/test.txt");
// Path
Path p1 = Paths.get("F:/", "test.txt");// F:\test.txt
System.out.println(p1);
Path p2 = file.toPath();
System.out.println(p2);
Path p3 = FileSystems.getDefault().getPath("F:/", "test.txt");
System.out.println(p3);
}
參考地址:https://www.cnblogs.com/maxigang/p/9044192.html
參考地址:https://www.cnblogs.com/zxfei/p/10901364.html