以字節流讀寫的三種方式
public class Test {private static final String FILE_PATH = "e:\\";private static final String FILE_TYPE = ".exe";private static final String FILE_FROM = FILE_PATH + 0 + FILE_TYPE;private static final String COPY_FILE_1 = FILE_PATH + 1 + FILE_TYPE;private static final String COPY_FILE_2 = FILE_PATH + 2 + FILE_TYPE;private static final String COPY_FILE_3 = FILE_PATH + 3 + FILE_TYPE;public static void main(String[] args) throws IOException {copyByBufStream(FILE_FROM, COPY_FILE_1);copyByBufArray(FILE_FROM, COPY_FILE_2);copyByByte(FILE_FROM, COPY_FILE_3);}/*** 利用緩衝輸入流讀取到一個緩衝容器後再寫入。建議使用*/public static boolean copyByBufStream(String filePathFrom, String filePathTo) {try {BufferedInputStream bufis = new BufferedInputStream(new FileInputStream(filePathFrom));BufferedOutputStream bufos = new BufferedOutputStream(new FileOutputStream(filePathTo));int ch = 0;while ((ch = bufis.read()) != -1) {bufos.write(ch);}bufos.close();bufis.close();return true;} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (IOException e) {e.printStackTrace();return false;}}/*** 每次讀取一個指定長度數組的字節。建議使用*/public static boolean copyByBufArray(String filePathFrom, String filePathTo) {try {FileInputStream fis = new FileInputStream(filePathFrom);FileOutputStream fos = new FileOutputStream(filePathTo);byte[] buf = new byte[1024];int len = 0;while ((len = fis.read(buf)) != -1) {fos.write(buf, 0, len);}fos.close();fis.close();return true;} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (IOException e) {e.printStackTrace();return false;}}/*** 一次讀取一個字節。千萬不要用,速度超級慢!*/public static boolean copyByByte(String filePathFrom, String filePathTo) {try {FileInputStream fis = new FileInputStream(filePathFrom);FileOutputStream fos = new FileOutputStream(filePathTo);int ch = 0;while ((ch = fis.read()) != -1) {fos.write(ch);}fos.close();fis.close();return true;} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (IOException e) {e.printStackTrace();return false;}}}
以字符流讀寫的三種方式
public class Test {private static final String FILE_PATH = "e:\\";private static final String FILE_TYPE = ".txt";private static final String FILE_FROM = FILE_PATH + 0 + FILE_TYPE;private static final String COPY_FILE_1 = FILE_PATH + 1 + FILE_TYPE;private static final String COPY_FILE_2 = FILE_PATH + 2 + FILE_TYPE;private static final String COPY_FILE_3 = FILE_PATH + 3 + FILE_TYPE;public static void main(String[] args) throws IOException {//注意,只能複製純文本格式的文件,不然就會出現亂碼copyByBufLine(FILE_FROM, COPY_FILE_1);copyByBufArray(FILE_FROM, COPY_FILE_2);copyByChar(FILE_FROM, COPY_FILE_3);}/*** 一次寫入一行字符*/public static boolean copyByBufLine(String filePathFrom, String filePathTo) {try {BufferedReader bufr = new BufferedReader(new FileReader(filePathFrom));BufferedWriter bufw = new BufferedWriter(new FileWriter(filePathTo));String line = null;//另外開闢一個緩衝區,存儲讀取的一行數據,返回包含該行內容的字符串,不包含換行符,若是已到達流末尾,則返回【 null】while ((line = bufr.readLine()) != null) {bufw.write(line);bufw.newLine();// 寫入一個行分隔符bufw.flush();}bufr.close();bufw.close();return true;} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (IOException e) {e.printStackTrace();return false;}}/*** 一次寫入指定個數的字符*/public static boolean copyByBufArray(String filePathFrom, String filePathTo) {try {BufferedReader bufr = new BufferedReader(new FileReader(filePathFrom));BufferedWriter bufw = new BufferedWriter(new FileWriter(filePathTo));char[] buf = new char[1024];int len = 0;while ((len = bufr.read(buf)) != -1) {bufw.write(buf, 0, len);bufw.flush();len = 0;}bufr.close();bufw.close();return true;} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (IOException e) {e.printStackTrace();return false;}}/*** 一次寫入一個字符*/public static boolean copyByChar(String filePathFrom, String filePathTo) {try {BufferedReader bufr = new BufferedReader(new FileReader(filePathFrom));BufferedWriter bufw = new BufferedWriter(new FileWriter(filePathTo));int ch = 0;while ((ch = bufr.read()) != -1) {bufw.write(ch);//寫入單個字符}bufr.close();bufw.close();return true;} catch (FileNotFoundException e) {e.printStackTrace();return false;} catch (IOException e) {e.printStackTrace();return false;}}}