10/31/2011 - Java I/O
对于Java I/O， 虽然JDK提控了大量的API， 但实际当中我们可能用到的并不多。 下面简单说说：
1. FileReader - 按照字符读取
2. FileInputStream - 按照字节读取
3. BufferedReader
4. BufferedInputStream / BufferedOutputStream

FileReader

private static void fileReader(String filePath) throws IOException {char[] c = new char[1];FileReader fr = new FileReader(filePath);while (fr.read(c) != -1) {System.out.print(new String(c));}fr.close();}

private static void fileInputStream(String filePath) throws IOException {byte[] data = new byte[1];FileInputStream fis = new FileInputStream(new File(filePath));while (fis.read(data) != -1) {System.out.print(new String(data));}fis.close();}

private static void bufferedReader(String filePath) throws IOException {FileReader fr = new FileReader(new File(filePath));BufferedReader br = new BufferedReader(fr);String output = null;while ((output = br.readLine()) != null) {System.out.println(output);}br.close();fr.close();}private static void readConsole() throws IOException {BufferedReader br = new BufferedReader(new InputStreamReader(System.in));String output = null;while ((output = br.readLine()) != null) {System.out.println("Response: " + output);if ("exit".equals(output))System.exit(0);}br.close();}

byte[] data = new byte[1];File srcFile = new File(".../Source.java");File desFile = new File(".../Des.txt");BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(srcFile));BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(desFile));while (bufferedInputStream.read(data) != -1) {bufferedOutputStream.write(data);}bufferedOutputStream.flush();// Print to TXT filebufferedInputStream = new BufferedInputStream(new FileInputStream(desFile));while (bufferedInputStream.read(data) != -1) {System.out.print(new String(data));}bufferedInputStream.close();bufferedOutputStream.close();