java中流的分類

1.按數據流的方法不同可以分為輸入流和輸出流
2.按處理數據單位的不同可以分為字節流和字符流
3.按功能的不同可以分為節點流和處理流
JDK所提供的所有流類型位于java.io內分別繼承自一下四種抽象流類型

字節流

一個字節一個字節的讀寫
1.FileInputStream

FileInputStream in = null;
        int b =0;
        try {
            in = new FileInputStream("f:\\test.txt");
        } catch (FileNotFoundException e) {
            System.out.print("文件找不到");
            e.printStackTrace();
        }
        try {
            while ((b =in.read()) != -1){
                System.out.print((char)b);//這么轉漢字（因為漢子是2個字節）會出錯
            }
            in.close();
        } catch (IOException e) {
            System.out.println("文件讀取錯誤");
            e.printStackTrace();
        }

2.FileOutputStream

        InputStream in = null;
        OutputStream out = null;
        try {
            in = new FileInputStream("f:\\test.txt");
            out = new FileOutputStream("f:\\copyTest.txt");
        } catch (FileNotFoundException e) {
            System.out.print("文件找不到");
            e.printStackTrace();
        }
        try {
            while ((b =in.read()) != -1){
                out.write(b);
            }
            in.close();
            out.close();
        } catch (IOException e) {
            System.out.println("文件復制完成");
            e.printStackTrace();
        }

字符流

一個字符一個字符的讀寫
1.FileReader

        Reader read = null;
        int b =0;
        try {
            read = new FileReader("f:\\test.txt");
        } catch (FileNotFoundException e) {
            System.out.print("文件找不到");
            
        }
        try {
            while ((b =read.read()) != -1){
                System.out.print((char)b);
            }
            read.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

2.FileWriter

               Reader read = null;
        Writer writer = null;
        int b = 0;
        try {
            read = new FileReader("f:\\test.txt");
            writer = new FileWriter("f:\\writerCopy");
        } catch (FileNotFoundException e) {
            System.out.print("文件找不到");
            
        }
        try {
            while ((b =read.read()) != -1){
                writer.write(b);
            }
            read.close();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }