Java IO实战操作(三)

/** * IO管道处理集合  */public void OutFile() throws FileNotFoundException {/** * 使用PrintStream进行输出 */PrintStream print = new PrintStream(new FileOutputStream(new File("d:"+ File.separator + "hello.txt")));print.println(true);print.println("Rollen");print.close();/** *****格式化输出******** */String name = "Rollen";int age = 20;print.printf("姓名：%s. 年龄：%d.", name, age);print.close();/** * 使用OutputStream向屏幕上输出内容 * */OutputStream out = System.out;try {out.write("hello".getBytes());} catch (Exception e) {e.printStackTrace();}try {out.close();} catch (Exception e) {e.printStackTrace();}/** * 为System.out.println()重定向输出 * */// 此刻直接输出到屏幕System.out.println("hello");File file = new File("d:" + File.separator + "hello.txt");try {System.setOut(new PrintStream(new FileOutputStream(file)));} catch (FileNotFoundException e) {e.printStackTrace();}System.out.println("这些内容在文件中才能看到哦！");/** * System.err重定向 这个例子也提示我们可以使用这种方法保存错误信息 * */System.err.println("这些在控制台输出");try {System.setErr(new PrintStream(new FileOutputStream(file)));} catch (FileNotFoundException e) {e.printStackTrace();}System.err.println("这些在文件中才能看到哦！");/** * System.in重定向 前提是文件中提前要有值* */if (!file.exists()) {return;} else {try {System.setIn(new FileInputStream(file));} catch (FileNotFoundException e) {e.printStackTrace();}byte[] bytes = new byte[1024];int len = 0;try {len = System.in.read(bytes);} catch (IOException e) {e.printStackTrace();}System.out.println("读入的内容为：" + new String(bytes, 0, len));}/** * 使用缓冲区从键盘上读入内容 * */BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));String str = null;System.out.println("请输入内容");try {str = buf.readLine();} catch (IOException e) {e.printStackTrace();}System.out.println("你输入的内容是：" + str);}/** * 消息发送类 */class Send implements Runnable {private PipedOutputStream out = null;public Send() {out = new PipedOutputStream();}public PipedOutputStream getOut() {return this.out;}public void run() {String message = "hello , Rollen";try {out.write(message.getBytes());} catch (Exception e) {e.printStackTrace();}try {out.close();} catch (Exception e) {e.printStackTrace();}}}/** * 接受消息类 * */class Recive implements Runnable {private PipedInputStream input = null;public Recive() {this.input = new PipedInputStream();}public PipedInputStream getInput() {return this.input;}public void run() {byte[] b = new byte[1000];int len = 0;try {len = this.input.read(b);} catch (Exception e) {e.printStackTrace();}try {input.close();} catch (Exception e) {e.printStackTrace();}System.out.println("接受的内容为 " + (new String(b, 0, len)));}/** Scanner读取数据 */public void OutFile() {File file = new File("d:" + File.separator + "hello.txt");Scanner sca = null;try {sca = new Scanner(file);} catch (FileNotFoundException e) {e.printStackTrace();}String str = sca.next();System.out.println("从文件中读取的内容是：" + str);}/** * 数据操作流DataOutputStream、DataInputStream类 * @throws IOException */public void DataOutFile() throws IOException {File file = new File("d:" + File.separator + "hello.txt");char[] ch = { 'A', 'B', 'C' };DataOutputStream out = null;out = new DataOutputStream(new FileOutputStream(file));for (char temp : ch) {out.writeChar(temp);}out.close();}/** * DataInputStream读取数据 * @throws IOException */public void DataInputStreamFile() throws IOException {File file = new File("d:" + File.separator + "hello.txt");DataInputStream input = new DataInputStream(new FileInputStream(file));char[] ch = new char[10];int count = 0;char temp;while ((temp = input.readChar()) != 'C') {ch[count++] = temp;}System.out.println(ch);}/** * 合并流 SequenceInputStream合并文件 合并hello1/hello2到hello中 * @throws IOException */public void SequenceInputStreamFile() throws IOException {File file1 = new File("d:" + File.separator + "hello1.txt");File file2 = new File("d:" + File.separator + "hello2.txt");File file3 = new File("d:" + File.separator + "hello.txt");InputStream input1 = new FileInputStream(file1);InputStream input2 = new FileInputStream(file2);OutputStream output = new FileOutputStream(file3);// 合并流SequenceInputStream sis = new SequenceInputStream(input1, input2);int temp = 0;while ((temp = sis.read()) != -1) {output.write(temp);}input1.close();input2.close();output.close();sis.close();}