io流

凡是Stream是字节，Reader、Writer是字符。

FileInputStream例子：

public class Ioliu {
    public static void main(String[] args) {
        
        Ioliu.mai();
    }
    public static void mai() {
        File file = new File("E:\\text1.txt");
        InputStream inputStream = null;
        int c;
        try {
            if (!file.exists()) {
                file.createNewFile();
            }
            inputStream = new FileInputStream(file);
            for (int i = 0; i < file.length(); i++) {
                char ch = (char) (inputStream.read());
                System.out.println(ch);
            }
//            while ((c = inputStream.read()) != -1) {
//                char  aaa=(char) c;
//                System.out.print(aaa);
//            }
            inputStream.close();
        } catch (FileNotFoundException e) {
            System.out.println("没有文件");
        } catch (IOException e) {
            System.out.println("错误了啊");
        }
    }

   public class TestFileReader {
   public static void main(String[] args) {
       File file =new File("d:\\TestFileReader.txt");
       FileReader fr = null;
       int c = 0;
       try {
           if (!file.exists()){
               file.createNewFile();
           }
           fr = new FileReader("d:/TestFileReader.txt");
           while ((c = fr.read())!=-1){
               char a = (char) c;
               System.out.println(a);
           }
           fr.close();
       }catch (FileNotFoundException e){
           System.out.println("找不到该文件");
       }catch (IOException e){
           System.out.println("错误了啊");
       }
   }
}

FileWriter例子：

     public class TestFileWriter {
    public static void main(String[] args) {
        FileWriter fw = null;
        try {
            fw=new FileWriter("d:/TestFileWriter.txt");
            for (int c = 0; c <=50000 ; c++) {
                fw.write(c);
            }
            fw.close();
        }catch (IOException e){
           e.printStackTrace();
            System.exit(-1);
        }
    }
}

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