JavaSE_9_IO流.pptVIP

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 节点流类型 类型 字节流 字符流 File FileInputStream FileOutputStream FileReader FileWriter Memory Array ByteArrayInputStream ByteArrayOutputStream CharArrayReader CharArrayWriter Memory String StringReader StringWriter Pipe(管道) PipedInputStream PipedOutputStream PipedReader PipedWriter * Java高端培训 文件流 文件流主要用来操作文件 JDK提供了4种： FileInputStream继承自InputStream FileOutputStream继承自OutputStream FileOutputStream(String name, boolean?append) FileReader继承自Reader FileWriter继承自Writer 还提供了一个FileWriter(String?fileName, boolean?append) 构造方法来指定是否使用追加模式 Java高端培训 * 示例:FileInputStream读文件 Java高端培训 // step1: 创建一个文件输入流对象 FileInputStream fin = null; try { fin = new FileInputStream(args[0]); System.out.println(可读取的字节数: + fin.available()); // step2: 读数据: 一次读取一个字节的数据,返回的是读到的字节. int i = fin.read(); while (i != -1) { //若遇到流的末尾,会返回-1 System.out.print((char) i); i = fin.read(); // 再读 } } catch (FileNotFoundException e) { e.printStackTrace(); System.exit(-1); }catch (IOException e) { // 捕获IO异常 e.printStackTrace(); }finally{ // step3: 关闭输入流 try { if(null != fin){ fin.close(); } } catch (IOException e) { e.printStackTrace(); } } FileInputStreamTest.java * 示例:FileOutputStream写文件 Java高端培训 int b = 0; FileInputStream in = null; FileOutputStream out = null; try { in = new FileInputStream(d:/IOTest/soruce.txt); out = new FileOutputStream(d:/IOTest/dest.txt); while ((b = in.read()) != -1) { out.write(b); } System.out.println(文件复制成功); } catch (FileNotFoundException e) { System.out.println(找不到指定文件); e.printStackTrace(); } catch (IOException e) { System.out.println(文件复制错误); e.printStackTrace(); }finally{ … } FileOutputStreamTest.java * 示例:FileReader读文件 Java高端培训 FileReader fr = null; int c = 0; try { fr = new FileReader(d:/IOTest/soruce.txt); while ((c = fr.read()) != -1) { System.out.p