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                [TOC] ## IO 輸入輸出流 ``` 字節(1 byte = 8 bit) 字符(2 byte = 16 bit) ``` >### 字符流 *(主要讀取文本相關內容。`txt,doxc`)* **FileReader(字符輸入流)** - 方法 ``` read() 一次讀一個數據,當read返回值為-1表示沒有數據。(int類型) read(字符數組, 偏移量, 讀取字符長度) ``` **FileWriter (字符輸入流)** - 對象實例化 ``` FileWriter fw = new FileWriter(File||文件地址) FileWriter fw = new FileWriter(File||文件地址,true) //true防止刷新覆蓋 ``` - 方法 ``` write(String str) 向文中寫字符串 flush() 刷新,將內存中的數據寫入到文件,這種方式會覆蓋原有內容。 close()關閉流。close 在關閉時先刷新,再關閉。 ``` ***** >### 字節流 *(什么都能讀)* **FileInputStream (字節輸入流)** **FileOutputStream (字節輸出流)** ``` public void FileOutputStreamTest(InputStream inputStream){ FileOutputStream fos = null; File file = new File("targerSrc"); if(file.exists()){ fos = new FileOutputStream(file) byte buffer = new byte[1024]; while((byteSize = inputstream.read(buffer)) != -1){ fos.write(buffer,0,byteSize) } fos.close(); } } ``` ***** >### 緩沖流 1. **緩沖字符流** ``` BufferedReader 緩沖字符輸入流 BufferedWriter 緩沖字符輸出流 ``` 2. **緩沖字節流** ``` BufferedInputStream 緩沖字節輸入流 BufferedOutputStream 緩沖字節輸出流 ``` ***BufferedReader 緩沖字符輸入流*** - 方法 ``` readLine()一次讀一行數據 ``` * [ ] 關閉流原則,先打開后關閉 *****
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