JavaIO

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static void serializeObject(Object object){
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    try (ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(dirPath))){
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        objectOutputStream.writeObject(object);
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        objectOutputStream.flush();
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    } catch (IOException e){
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        System.out.println("IOException");
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        System.out.println("序列化失败");
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    }
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    System.out.println("序列化成功");
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}

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public class Main {
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    public static void main(String[] args) {
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        try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream()){
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            byteArrayOutputStream.write("hello ".getBytes());
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            byteArrayOutputStream.write("world".getBytes());
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            byte[] bytes = byteArrayOutputStream.toByteArray();
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            String str = byteArrayOutputStream.toString();
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            System.out.println(Arrays.toString(bytes));
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            System.out.println(str);
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        } catch (IOException e){
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            System.out.println("IO");
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        }
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    }
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}

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public class Main {
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    static String dirPath = "C:\\JavaIOFiles\\text1.txt";
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    public static void main(String[] args) {
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        try (InputStream inputStream = new FileInputStream(dirPath)){
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            int data;
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            while ((data = inputStream.read()) != -1){
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                System.out.print((char) data);
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            }
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        } catch (IOException e) {
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            System.out.println("IO");
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        }
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    }
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}

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try (InputStream inputStream = new FileInputStream(dirPath)){
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    byte[] buffer = new byte[1024];
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    System.out.println();
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    inputStream.read(buffer);
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    System.out.println(new String(buffer));
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} catch (IOException e) {
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    System.out.println("IO");
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}

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try (InputStream inputStream = new FileInputStream(dirPath)){
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    byte[] buffer = new byte[1024];
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    System.out.println();
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    int readBytes = inputStream.read(buffer);
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    System.out.println(new String(buffer, 0, readBytes)); //将buffer数组的第0位开始的后readBytes个字节转成字符串
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} catch (IOException e) {
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    System.out.println("IO");
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}

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try (FileInputStream inputStream = new FileInputStream(dirPath)){
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    byte[] buffer;
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    buffer = inputStream.readAllBytes();
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    System.out.println(new String(buffer));
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} catch (IOException e) {
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    System.out.println("IO");
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}

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try (InputStream inputStream = new FileInputStream(dirPath)){
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    //text1中是:hello world !
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    byte[] buffer = new byte[1024];
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    int readBytes = 0;
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    readBytes += inputStream.read(buffer, 0, 1); //读入一个h，现在指针停在e处
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    inputStream.mark(1024); //在当前位置e处做标记
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    readBytes += inputStream.read(buffer, readBytes, 3); //读入ell
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    inputStream.reset(); //回到e处
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    readBytes += inputStream.read(buffer, readBytes, 3); //再读入ell
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    System.out.println(new String(buffer, 0, readBytes));
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} catch (IOException e) {
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    System.out.println("IOException");
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}

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public SequenceInputStream(Enumeration<? extends InputStream> e)
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public SequenceInputStream(InputStream s1, InputStream s2)

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byte[] bytes = "hello world".getBytes();
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try (ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes)){
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    byte[] buffer;
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    buffer = byteArrayInputStream.readAllBytes();
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    System.out.println(new String(buffer));
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} catch (IOException e) {
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    System.out.println("IO");
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}

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try (OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(dirPath))){
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    outputStreamWriter.write("oh");
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    outputStreamWriter.flush();
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} catch (IOException e){
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    System.out.println("IO");
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}

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try (StringWriter stringWriter = new StringWriter()){
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    stringWriter.write("hello");
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    stringWriter.write(" world");
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    stringWriter.flush();
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    String s = stringWriter.toString();
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    System.out.println(s);
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} catch (IOException e){
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    System.out.println("IO");
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}

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try (CharArrayWriter charArrayWriter = new CharArrayWriter()){
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    charArrayWriter.write("hello");
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    charArrayWriter.write(" world!");
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    char[] chars = charArrayWriter.toCharArray();
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    String s = charArrayWriter.toString();
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    System.out.println(chars);
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    System.out.println(s);
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} catch (IOException e){
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    System.out.println("IO");
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}