IO流按使用方式可以簡單的分爲4種：
1.字符字節流
2.緩衝字符字節流
3.轉換流
4.數據流
字節流例子：
運行前
運行後
字符流例子：
運行前
運行後
緩衝流先將數據讀入到緩衝區中，目的是提高程序讀出的性能。緩衝流也分爲字節緩衝流和字符緩衝流。
示例：
運行後：
轉換流，操作字符文件時有可能因爲編碼不一樣產生亂碼。字節流向字符流轉換：
運行後：
數據流：方便將程序中數據存入文件。
運行後:
貼上面的測試代碼
public static void main(String[] args) {
/*
FileInputStream fileInputStream = null;
FileOutputStream fileOutputStream = null;
//字節流字節文件。視頻，音頻，圖片，文檔。
try {
//輸入流
fileInputStream = new FileInputStream("E:\\Document\\temp\\甜點.jpg");
//輸出流
fileOutputStream = new FileOutputStream("E:\\Document\\temp\\newFood.jpg");
//輸入輸出流小車，加速讀寫。
byte []car = new byte[1024];
int length = 0;
while((length=fileInputStream.read(car))!=-1) {
fileOutputStream.write(car,0,length);
}
fileOutputStream.flush();
System.out.println("完畢");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(fileInputStream!=null) {
try {
fileInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
*/
/*
//字符流：操作字符流文件(記事本）
FileReader fileReader = null;
FileWriter fileWriter = null;
try {
fileReader = new FileReader("E:\\Document\\temp\\test.txt");//輸入流
fileWriter = new FileWriter("E:\\Document\\temp\\new.txt");//輸出流
//小車
char []car = new char[1024];
int length = 0;
while((length=fileReader.read(car))!=-1) {
fileWriter.write(car,0,length);
}
fileWriter.flush();//清空緩存
System.out.println("完畢");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(fileReader!=null) {
try {
fileReader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
*/
/*
//緩衝流
BufferedInputStream bufferedInputStream = null;
BufferedOutputStream bufferedOutputStream = null;
try {
bufferedInputStream = new BufferedInputStream(new FileInputStream("E:\\Document\\temp\\甜點.jpg"));
bufferedOutputStream = new BufferedOutputStream(new FileOutputStream("E:\\Document\\temp\\不好吃.jpg"));
byte []car = new byte[1024];
int length = 0;
while((length=bufferedInputStream.read(car))!=-1) {
bufferedOutputStream.write(car,0,length);
}
bufferedOutputStream.flush();
System.out.println("完畢");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(bufferedInputStream!=null) {
try {
bufferedInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
*/
/*
//轉換流，操作字符文件 時有可能因爲編碼不一樣產生亂嗎，字節流向字符流轉換
InputStreamReader inputStreamReader = null;
OutputStreamWriter outputStreamWriter = null;
try {
inputStreamReader = new InputStreamReader(new FileInputStream("E:\\Document\\temp\\test.txt"), "UTF-8");
outputStreamWriter = new OutputStreamWriter(new FileOutputStream("E:\\Document\\temp\\真香.txt"), "UTF-8");
char []car = new char[1024];
int length = 0;
while((length=inputStreamReader.read(car))!=-1) {
outputStreamWriter.write(car,0,length);
}
outputStreamWriter.flush();
System.out.println("完畢");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(inputStreamReader!=null) {
try {
inputStreamReader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
*/
double price = 7.8;
//數據流：方便將程序中數據存入文件。
try {
DataOutputStream dataOutputStream = new DataOutputStream(new FileOutputStream("E:\\Document\\temp\\data.temp"));
dataOutputStream.writeDouble(price);//輸出到硬盤
dataOutputStream.flush();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
DataInputStream dataInputStream = new DataInputStream(new FileInputStream("E:\\Document\\temp\\data.temp"));
double p = dataInputStream.readDouble();//讀取剛纔輸出的數據
System.out.println(p);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}